480 changed files with 16052 additions and 43028 deletions
--- a/.dockerignore
+++ b/.dockerignore
@ -1,5 +1,4 @@
-.dockerignore
-.travis.yml
+.*
 *.md
 DCO
 LICENSE
--- a/.drone.yml
+++ b/.drone.yml
@ -1,47 +0,0 @@
---
-kind: pipeline
-name: default
-
-platform:
-  os: linux
-  arch: amd64
-
-steps:
- name: publish
-  pull: default
-  image: plugins/docker:18.09
-  settings:
-    registry: https://registry.nixaid.com
-    repo: "registry.nixaid.com/${DRONE_REPO_NAMESPACE}/${DRONE_REPO_NAME}"
-    tags:
-    - latest
-    username:
-      from_secret: docker_username
-    password:
-      from_secret: docker_password
-    # storage_path: /drone/docker
-    # storage_driver: aufs
-    # ipv6: false
-    # debug: true
-  when:
-    branch:
-    - master
-    event:
-    - push
-    - tag
-
- name: notify
-  pull: default
-  image: drillster/drone-email:latest
-  settings:
-    from: "Drone CI <noreply@nixaid.com>"
-    host: mx.nixaid.com
-    port: 587
-    subject: "NIXAID Drone Pipeline {{#success build.status}}SUCCESS{{else}}FAILURE{{/success}} Notification"
-  when:
-    event:
-    - push
-    - tag
-    status:
-    - success
-    - failure
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@ -7,26 +7,18 @@ If you are using a third party client, please create issues on their respective
 Are you using a development build of Clair (e.g. quay.io/coreos/clair-git)?
 Your problem might be solved by switching to a stable release (e.g. quay.io/coreos/clair).

-Issues that do not contain the Environment section will be automatically closed.
-If you're making a feature request, please specify "N/A" under the environment section.
-Nobody can help you without context.
-
 -->

-### Description of Problem / Feature Request
+**Description of Problem**:

-<!--- your content here --->

-### Expected Outcome
+**Expected Outcome**:

-<!--- your content here --->

-### Actual Outcome
+**Actual Outcome**:

-<!--- your content here --->
-
-### Environment

+**Environment**:
 - Clair version/image: 
 - Clair client name/version: 
 - Host OS: 
--- a/.github/issue-close-app.yml
+++ b/.github/issue-close-app.yml
@ -1,4 +0,0 @@
-comment: "This issue is closed because it does not meet our issue template. Please read it."
-issueConfigs:
- content:
-  - "### Environment"
--- a/.github/stale.yml
+++ b/.github/stale.yml
@ -1,12 +0,0 @@
-daysUntilStale: 60
-daysUntilClose: 7
-exemptLabels:
- lifecycle/preserve
-exemptProjects: true
-exemptMilestones: true
-staleLabel: lifecycle/stale
-markComment: >
-  This issue has been automatically marked as stale because it has not had
-  recent activity. It will be closed if no further activity occurs. Thank you
-  for your contributions.
-limitPerRun: 30
--- a/.travis.yml
+++ b/.travis.yml
@ -1,24 +1,14 @@
 language: go

 go: 
-  - "1.11.x"
+  - 1.8

 sudo: required

-env:
-  global:
-  - PATH=$HOME/.local/bin:$PATH
-
 install:
 - curl https://glide.sh/get | sh
- mkdir -p $HOME/.local/bin
- curl -o $HOME/.local/bin/prototool -sSL https://github.com/uber/prototool/releases/download/v0.1.0/prototool-$(uname -s)-$(uname -m)
- chmod +x $HOME/.local/bin/prototool

 script:
- diff -u <(echo -n) <(gofmt -l -s $(go list -f '{{.Dir}}') | grep -v '/vendor/')
- prototool format -d api/v3/clairpb/clair.proto
- prototool lint api/v3/clairpb/clair.proto
 - go test $(glide novendor | grep -v contrib)

 dist: trusty
@ -31,6 +21,11 @@ notifications:

 matrix:
  include:
+  - addons:
+      apt:
+        packages:
+        - rpm
+      postgresql: 9.4
  - addons:
      apt:
        packages:
--- a/22
+++ b/22
@ -12,16 +12,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.

-FROM golang:1.10-alpine AS build
-RUN apk add --no-cache git build-base
-ADD .   /go/src/github.com/coreos/clair/
-WORKDIR /go/src/github.com/coreos/clair/
-RUN export CLAIR_VERSION=$(git describe --tag --always --dirty) && \
-	go build -ldflags "-X github.com/coreos/clair/pkg/version.Version=$CLAIR_VERSION" github.com/coreos/clair/cmd/clair
+FROM golang:1.8-alpine

-FROM alpine:3.8
-COPY --from=build /go/src/github.com/coreos/clair/clair /clair
-RUN apk add --no-cache git rpm xz ca-certificates dumb-init
-ENTRYPOINT ["/usr/bin/dumb-init", "--", "/clair"]
 VOLUME /config
 EXPOSE 6060 6061
+
+ADD .   /go/src/github.com/coreos/clair/
+WORKDIR /go/src/github.com/coreos/clair/
+
+RUN apk add --no-cache git bzr rpm xz dumb-init && \
+    go install -v github.com/coreos/clair/cmd/clair && \
+    mv /go/bin/clair /clair && \
+    rm -rf /go /usr/local/go
+
+ENTRYPOINT ["/usr/bin/dumb-init", "--", "/clair"]
+
--- a/Documentation/drivers-and-data-sources.md
+++ b/Documentation/drivers-and-data-sources.md
@ -18,13 +18,11 @@ All of these components can be found in the `ext/` directory.
 ## Data Sources for the built-in drivers

 | Data Source                   | Data Collected                                                           | Format | License         |
-|------------------------------------|--------------------------------------------------------------------------|--------|-----------------|
+|-------------------------------|--------------------------------------------------------------------------|--------|-----------------|
 | [Debian Security Bug Tracker] | Debian 6, 7, 8, unstable namespaces                                      | [dpkg] | [Debian]        |
 | [Ubuntu CVE Tracker]          | Ubuntu 12.04, 12.10, 13.04, 14.04, 14.10, 15.04, 15.10, 16.04 namespaces | [dpkg] | [GPLv2]         |
 | [Red Hat Security Data]       | CentOS 5, 6, 7 namespaces                                                | [rpm]  | [CVRF]          |
 | [Oracle Linux Security Data]  | Oracle Linux 5, 6, 7 namespaces                                          | [rpm]  | [CVRF]          |
-| [Amazon Linux Security Advisories] | Amazon Linux 2018.03, 2 namespaces                                       | [rpm]  | [MIT-0]         |
-| [SUSE OVAL Descriptions]           | openSUSE, SUSE Linux Enterprise namespaces                               | [rpm]  | [CC-BY-NC-4.0]  |
 | [Alpine SecDB]                | Alpine 3.3, Alpine 3.4, Alpine 3.5 namespaces                            | [apk]  | [MIT]           |
 | [NIST NVD]                    | Generic Vulnerability Metadata                                           | N/A    | [Public Domain] |

@ -32,8 +30,6 @@ All of these components can be found in the `ext/` directory.
 [Ubuntu CVE Tracker]: https://launchpad.net/ubuntu-cve-tracker
 [Red Hat Security Data]: https://www.redhat.com/security/data/metrics
 [Oracle Linux Security Data]: https://linux.oracle.com/security/
-[SUSE OVAL Descriptions]: https://www.suse.com/de-de/support/security/oval/
-[Amazon Linux Security Advisories]: https://alas.aws.amazon.com/
 [NIST NVD]: https://nvd.nist.gov
 [dpkg]: https://en.wikipedia.org/wiki/dpkg
 [rpm]: http://www.rpm.org
@ -44,8 +40,6 @@ All of these components can be found in the `ext/` directory.
 [Alpine SecDB]: http://git.alpinelinux.org/cgit/alpine-secdb/
 [apk]: http://git.alpinelinux.org/cgit/apk-tools/
 [MIT]: https://gist.github.com/jzelinskie/6da1e2da728424d88518be2adbd76979
-[MIT-0]: https://spdx.org/licenses/MIT-0.html
-[CC-BY-NC-4.0]: https://creativecommons.org/licenses/by-nc/4.0/]

 ## Adding new drivers

--- a/Documentation/integrations.md
+++ b/Documentation/integrations.md
@ -10,10 +10,6 @@ This document tracks projects that integrate with Clair. [Join the community](ht

 [Yair](https://github.com/yfoelling/yair): a lightweight command-line for working with clair with many different outputs. Mainly designed for usage in a CI Job.

-[Claircli](https://github.com/joelee2012/claircli):  A simple cmd tool to interact with CoreOS Clair.
-
-[Paclair](https://github.com/yebinama/paclair): a Python3 CLI tool to interact with Clair (easily configurable to access private registries).
-
 [Clairctl](https://github.com/jgsqware/clairctl): a lightweight command-line tool for working locally with Clair and generate HTML report.

 [Clair-SQS](https://github.com/zalando-incubator/clair-sqs): a container containing Clair and additional processes that integrate Clair with [Amazon SQS][sqs].
--- a/Documentation/presentations.md
+++ b/Documentation/presentations.md
@ -2,23 +2,16 @@

 This document tracks projects that integrate with Clair. [Join the community](https://github.com/coreos/clair/), and help us keep the list up-to-date.

-## Clair v3
+## Clair v1

-Coming soon...
-
-## Clair v2
-
-| Title                                                                     | Event                         | Video/Slides                                           |
-|---------------------------------------------------------------------------|-------------------------------|--------------------------------------------------------|
-| Clair: The Container Image Security Analyzer                              | [ContainerDays Boston 2016]   | [YouTube][CDB2016YouTube] [SlideShare][CDB2016Slides]  |
-| Identifying Common Vulnerabilities and Exposures in Containers with Clair | [CoreOS Fest 2016]            | [YouTube](https://www.youtube.com/watch?v=YDCa51BK2q0) |
-| Clair: A Container Image Security Analyzer                                | [Microservices NYC]           | [YouTube](https://www.youtube.com/watch?v=ynwKi2yhIX4) |
-| Clair: A Container Image Security Analyzer                                | [Container Orchestration NYC] | [YouTube](https://www.youtube.com/watch?v=wTfCOUDNV_M) |
+| Title                                                                     | Event                         | Video                 | Slides                |
+|---------------------------------------------------------------------------|-------------------------------|-----------------------|-----------------------|
+| Clair: The Container Image Security Analyzer                              | [ContainerDays Boston 2016]   | https://goo.gl/ey7QQR | https://goo.gl/WmNiwA |
+| Identifying Common Vulnerabilities and Exposures in Containers with Clair | [CoreOS Fest 2016]            | https://goo.gl/fGtb9s | https://goo.gl/35gixV |
+| Clair: A Container Image Security Analyzer                                | [Microservices NYC]           | https://goo.gl/WZaCU2 | https://goo.gl/sCXGcH |
+| Clair: A Container Image Security Analyzer                                | [Container Orchestration NYC] | https://goo.gl/wxi24C | https://goo.gl/VfRxv2 |

 [ContainerDays Boston 2016]: http://dynamicinfradays.org/events/2016-boston/
-[CDB2016YouTube]: https://www.youtube.com/watch?v=Kri67PtPv6s
-[CDB2016Slides]: https://www.slideshare.net/CoreOS_Slides/clair-a-container-image-security-analyzer-61197704
-
 [CoreOS Fest 2016]: https://coreos.com/fest/#2016
 [Microservices NYC]: https://www.meetup.com/Microservices-NYC/events/230023492/
 [Container Orchestration NYC]: https://www.meetup.com/Kubernetes-Cloud-Native-New-York/events/229779466/
--- a/Documentation/running-clair.md
+++ b/Documentation/running-clair.md
@ -44,7 +44,7 @@ A [PostgreSQL 9.4+] database instance is required for all instructions.
 #### Kubernetes (Helm)

 If you don't have a local Kubernetes cluster already, check out [minikube].
-This assumes you've already ran `helm init`, you have access to a currently running instance of Tiller and that you are running the latest version of helm.
+This assumes you've already ran `helm init` and you have access to a currently running instance of Tiller.

 [minikube]: https://github.com/kubernetes/minikube

@ -53,7 +53,6 @@ git clone https://github.com/coreos/clair
 cd clair/contrib/helm
 cp clair/values.yaml ~/my_custom_values.yaml
 vi ~/my_custom_values.yaml
-helm dependency update clair
 helm install clair -f ~/my_custom_values.yaml
 ```

@ -83,16 +82,18 @@ $ docker run --net=host -d -p 6060-6061:6060-6061 -v $PWD/clair_config:/config q

 #### Source

-To build Clair, you need the latest stable version of [Go] and a working [Go environment].
+To build Clair, you need to latest stable version of [Go] and a working [Go environment].
 In addition, Clair requires some additional binaries be installed on the system [$PATH] as runtime dependencies:

 * [git]
+* [bzr]
 * [rpm]
 * [xz]

 [Go]: https://github.com/golang/go/releases
 [Go environment]: https://golang.org/doc/code.html
 [git]: https://git-scm.com
+[bzr]: http://bazaar.canonical.com/en
 [rpm]: http://www.rpm.org
 [xz]: http://tukaani.org/xz
 [$PATH]: https://en.wikipedia.org/wiki/PATH_(variable)
--- a/README.md
+++ b/README.md
@ -1,6 +1,3 @@
-[![Build Status](https://drone.nixaid.com/api/badges/arno/clair/status.svg)](https://drone.nixaid.com/arno/clair)
----
-
 # Clair

 [![Build Status](https://api.travis-ci.org/coreos/clair.svg?branch=master "Build Status")](https://travis-ci.org/coreos/clair)
@ -50,7 +47,7 @@ Thus, the project was named `Clair` after the French term which translates to *c
 ## Contact

 - IRC: #[clair](irc://irc.freenode.org:6667/#clair) on freenode.org
- Bugs: [issues](https://github.com/coreos/clair/issues)
+- Bugs: [issues](https://github.com/coreos/etcd/issues)

 ## Contributing

--- a/ROADMAP.md
+++ b/ROADMAP.md
@ -8,12 +8,8 @@ The [milestones defined in GitHub](https://github.com/coreos/clair/milestones) r
 The roadmap below outlines new features that will be added to Clair, and while subject to change, define what future stable will look like.

 - Support multiple namespaces per image
-  - This enables language-level package managers (e.g. npm, pip) in the future
- Take advantage of OCI/Docker content-addressiblity to avoid duplicated work
-  - This simplifies the amount of work required for an offline clair in the future
- Support mappings between source packages and binary packages
- Versioned detectors that are present in API results
-  - This will enable clients to determine when images need to be reindexed
- gRPC API that works on sets of layers rather than individual layers
- Structured logging in JSON
+  - This enables language-level package managers (e.g. npm, pip)
 - Improve coverage and readability of documentation
+- Decouple the project from Postgres
+- gRPC API supporting direct uploads of images
+- Support operating Clair without internet access
--- a/analyzer.go
+++ b/analyzer.go
@ -1,145 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package clair
-
-import (
-	"context"
-
-	log "github.com/sirupsen/logrus"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/ext/featurefmt"
-	"github.com/coreos/clair/ext/featurens"
-	"github.com/coreos/clair/ext/imagefmt"
-)
-
-// AnalyzeError represents an failure when analyzing layer or constructing
-// ancestry.
-type AnalyzeError string
-
-func (e AnalyzeError) Error() string {
-	return string(e)
-}
-
-var (
-	// StorageError represents an analyze error caused by the storage
-	StorageError = AnalyzeError("failed to query the database.")
-	// RetrieveBlobError represents an analyze error caused by failure of
-	// downloading or extracting layer blobs.
-	RetrieveBlobError = AnalyzeError("failed to download layer blob.")
-	// ExtractBlobError represents an analyzer error caused by failure of
-	// extracting a layer blob by imagefmt.
-	ExtractBlobError = AnalyzeError("failed to extract files from layer blob.")
-	// FeatureDetectorError is an error caused by failure of feature listing by
-	// featurefmt.
-	FeatureDetectorError = AnalyzeError("failed to scan feature from layer blob files.")
-	// NamespaceDetectorError is an error caused by failure of namespace
-	// detection by featurens.
-	NamespaceDetectorError = AnalyzeError("failed to scan namespace from layer blob files.")
-)
-
-// AnalyzeLayer retrieves the clair layer with all extracted features and namespaces.
-// If a layer is already scanned by all enabled detectors in the Clair instance, it returns directly.
-// Otherwise, it re-download the layer blob and scan the features and namespaced again.
-func AnalyzeLayer(ctx context.Context, store database.Datastore, blobSha256 string, blobFormat string, downloadURI string, downloadHeaders map[string]string) (*database.Layer, error) {
-	layer, found, err := database.FindLayerAndRollback(store, blobSha256)
-	logFields := log.Fields{"layer.Hash": blobSha256}
-	if err != nil {
-		log.WithError(err).WithFields(logFields).Error("failed to find layer in the storage")
-		return nil, StorageError
-	}
-
-	var scannedBy []database.Detector
-	if found {
-		scannedBy = layer.By
-	}
-
-	// layer will be scanned by detectors not scanned the layer already.
-	toScan := database.DiffDetectors(EnabledDetectors(), scannedBy)
-	if len(toScan) != 0 {
-		log.WithFields(logFields).Debug("scan layer blob not already scanned")
-		newLayerScanResult := &database.Layer{Hash: blobSha256, By: toScan}
-		blob, err := retrieveLayerBlob(ctx, downloadURI, downloadHeaders)
-		if err != nil {
-			log.WithError(err).WithFields(logFields).Error("failed to retrieve layer blob")
-			return nil, RetrieveBlobError
-		}
-
-		defer func() {
-			if err := blob.Close(); err != nil {
-				log.WithFields(logFields).Error("failed to close layer blob reader")
-			}
-		}()
-
-		files := append(featurefmt.RequiredFilenames(toScan), featurens.RequiredFilenames(toScan)...)
-		fileMap, err := imagefmt.Extract(blobFormat, blob, files)
-		if err != nil {
-			log.WithFields(logFields).WithError(err).Error("failed to extract layer blob")
-			return nil, ExtractBlobError
-		}
-
-		newLayerScanResult.Features, err = featurefmt.ListFeatures(fileMap, toScan)
-		if err != nil {
-			log.WithFields(logFields).WithError(err).Error("failed to detect features")
-			return nil, FeatureDetectorError
-		}
-
-		newLayerScanResult.Namespaces, err = featurens.Detect(fileMap, toScan)
-		if err != nil {
-			log.WithFields(logFields).WithError(err).Error("failed to detect namespaces")
-			return nil, NamespaceDetectorError
-		}
-
-		if err = saveLayerChange(store, newLayerScanResult); err != nil {
-			log.WithFields(logFields).WithError(err).Error("failed to store layer change")
-			return nil, StorageError
-		}
-
-		layer = database.MergeLayers(layer, newLayerScanResult)
-	} else {
-		log.WithFields(logFields).Debug("found scanned layer blob")
-	}
-
-	return layer, nil
-}
-
-// EnabledDetectors retrieves a list of all detectors installed in the Clair
-// instance.
-func EnabledDetectors() []database.Detector {
-	return append(featurefmt.ListListers(), featurens.ListDetectors()...)
-}
-
-// RegisterConfiguredDetectors populates the database with registered detectors.
-func RegisterConfiguredDetectors(store database.Datastore) {
-	if err := database.PersistDetectorsAndCommit(store, EnabledDetectors()); err != nil {
-		panic("failed to initialize Clair analyzer")
-	}
-}
-
-func saveLayerChange(store database.Datastore, layer *database.Layer) error {
-	if err := database.PersistFeaturesAndCommit(store, layer.GetFeatures()); err != nil {
-		return err
-	}
-
-	if err := database.PersistNamespacesAndCommit(store, layer.GetNamespaces()); err != nil {
-		return err
-	}
-
-	if err := database.PersistPartialLayerAndCommit(store, layer); err != nil {
-		return err
-	}
-
-	return nil
-}
--- a/ancestry.go
+++ b/ancestry.go
@ -1,355 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package clair
-
-import (
-	"crypto/sha256"
-	"encoding/hex"
-	"encoding/json"
-	"strings"
-
-	log "github.com/sirupsen/logrus"
-
-	"github.com/coreos/clair/database"
-)
-
-type layerIndexedFeature struct {
-	Feature      *database.LayerFeature
-	Namespace    *layerIndexedNamespace
-	IntroducedIn int
-}
-
-type layerIndexedNamespace struct {
-	Namespace    database.LayerNamespace `json:"namespace"`
-	IntroducedIn int                     `json:"introducedIn"`
-}
-
-// AncestryBuilder builds an Ancestry, which contains an ordered list of layers
-// and their features.
-type AncestryBuilder struct {
-	layerIndex int
-	layerNames []string
-	detectors  []database.Detector
-	namespaces []layerIndexedNamespace // unique namespaces
-	features   map[database.Detector][]layerIndexedFeature
-}
-
-// NewAncestryBuilder creates a new ancestry builder.
-//
-// ancestry builder takes in the extracted layer information and produce a set of
-// namespaces, features, and the relation between features for the whole image.
-func NewAncestryBuilder(detectors []database.Detector) *AncestryBuilder {
-	return &AncestryBuilder{
-		layerIndex: 0,
-		detectors:  detectors,
-		namespaces: make([]layerIndexedNamespace, 0),
-		features:   make(map[database.Detector][]layerIndexedFeature),
-	}
-}
-
-// AddLeafLayer adds a leaf layer to the ancestry builder, and computes the
-// namespaced features.
-func (b *AncestryBuilder) AddLeafLayer(layer *database.Layer) {
-	b.layerNames = append(b.layerNames, layer.Hash)
-	for i := range layer.Namespaces {
-		b.updateNamespace(&layer.Namespaces[i])
-	}
-
-	allFeatureMap := map[database.Detector][]database.LayerFeature{}
-	for i := range layer.Features {
-		layerFeature := layer.Features[i]
-		allFeatureMap[layerFeature.By] = append(allFeatureMap[layerFeature.By], layerFeature)
-	}
-
-	// we only care about the ones specified by builder's detectors
-	featureMap := map[database.Detector][]database.LayerFeature{}
-	for i := range b.detectors {
-		detector := b.detectors[i]
-		featureMap[detector] = allFeatureMap[detector]
-	}
-
-	for detector := range featureMap {
-		b.addLayerFeatures(detector, featureMap[detector])
-	}
-
-	b.layerIndex++
-}
-
-// Every detector inspects a set of files for the features
-// therefore, if that set of files gives a different set of features, it
-// should replace the existing features.
-func (b *AncestryBuilder) addLayerFeatures(detector database.Detector, features []database.LayerFeature) {
-	if len(features) == 0 {
-		// TODO(sidac): we need to differentiate if the detector finds that all
-		// features are removed ( a file change ), or the package installer is
-		// removed ( a file deletion ), or there's no change in the file ( file
-		// does not exist in the blob ) Right now, we're just assuming that no
-		// change in the file because that's the most common case.
-		return
-	}
-
-	existingFeatures := b.features[detector]
-	currentFeatures := make([]layerIndexedFeature, 0, len(features))
-	// Features that are not in the current layer should be removed.
-	for i := range existingFeatures {
-		feature := existingFeatures[i]
-		for j := range features {
-			if features[j] == *feature.Feature {
-				currentFeatures = append(currentFeatures, feature)
-				break
-			}
-		}
-	}
-
-	// Features that newly introduced in the current layer should be added.
-	for i := range features {
-		found := false
-		for j := range existingFeatures {
-			if *existingFeatures[j].Feature == features[i] {
-				found = true
-				break
-			}
-		}
-
-		if !found {
-			namespace, found := b.lookupNamespace(&features[i])
-			if !found {
-				continue
-			}
-
-			currentFeatures = append(currentFeatures, b.createLayerIndexedFeature(namespace, &features[i]))
-		}
-	}
-
-	b.features[detector] = currentFeatures
-}
-
-// updateNamespace update the namespaces for the ancestry. It does the following things:
-// 1. when a detector detects a new namespace, it's added to the ancestry.
-// 2. when a detector detects a difference in the detected namespace, it
-// replaces the namespace, and also move all features under that namespace to
-// the new namespace.
-func (b *AncestryBuilder) updateNamespace(layerNamespace *database.LayerNamespace) {
-	var (
-		previous     *layerIndexedNamespace
-		foundUpgrade bool
-	)
-
-	newNSNames := strings.Split(layerNamespace.Name, ":")
-	if len(newNSNames) != 2 {
-		log.Error("invalid namespace name")
-	}
-
-	newNSName := newNSNames[0]
-	newNSVersion := newNSNames[1]
-	for i, ns := range b.namespaces {
-		nsNames := strings.Split(ns.Namespace.Name, ":")
-		if len(nsNames) != 2 {
-			log.Error("invalid namespace name")
-			continue
-		}
-
-		nsName := nsNames[0]
-		nsVersion := nsNames[1]
-		if ns.Namespace.VersionFormat == layerNamespace.VersionFormat && nsName == newNSName {
-			if nsVersion != newNSVersion {
-				previous = &b.namespaces[i]
-				foundUpgrade = true
-				break
-			} else {
-				// not changed
-				return
-			}
-		}
-	}
-
-	// we didn't found the namespace is a upgrade from another namespace, so we
-	// simply add it.
-	if !foundUpgrade {
-		b.namespaces = append(b.namespaces, layerIndexedNamespace{
-			Namespace:    *layerNamespace,
-			IntroducedIn: b.layerIndex,
-		})
-
-		return
-	}
-
-	// All features referencing to this namespace are now pointing to the new namespace.
-	// Also those features are now treated as introduced in the same layer as
-	// when this new namespace is introduced.
-	previous.Namespace = *layerNamespace
-	previous.IntroducedIn = b.layerIndex
-
-	for _, features := range b.features {
-		for i, feature := range features {
-			if feature.Namespace == previous {
-				features[i].IntroducedIn = previous.IntroducedIn
-			}
-		}
-	}
-}
-
-func (b *AncestryBuilder) createLayerIndexedFeature(namespace *layerIndexedNamespace, feature *database.LayerFeature) layerIndexedFeature {
-	return layerIndexedFeature{
-		Feature:      feature,
-		Namespace:    namespace,
-		IntroducedIn: b.layerIndex,
-	}
-}
-
-func (b *AncestryBuilder) lookupNamespace(feature *database.LayerFeature) (*layerIndexedNamespace, bool) {
-	matchedNamespaces := []*layerIndexedNamespace{}
-	if feature.PotentialNamespace.Name != "" {
-		a := &layerIndexedNamespace{
-			Namespace: database.LayerNamespace{
-				Namespace: feature.PotentialNamespace,
-			},
-			IntroducedIn: b.layerIndex,
-		}
-		matchedNamespaces = append(matchedNamespaces, a)
-	} else {
-
-		for i, namespace := range b.namespaces {
-			if namespace.Namespace.VersionFormat == feature.VersionFormat {
-				matchedNamespaces = append(matchedNamespaces, &b.namespaces[i])
-			}
-		}
-	}
-
-	if len(matchedNamespaces) == 1 {
-		return matchedNamespaces[0], true
-	}
-
-	serialized, _ := json.Marshal(matchedNamespaces)
-	fields := log.Fields{
-		"feature.Name":               feature.Name,
-		"feature.VersionFormat":      feature.VersionFormat,
-		"ancestryBuilder.namespaces": string(serialized),
-	}
-
-	if len(matchedNamespaces) > 1 {
-		log.WithFields(fields).Warn("skip features with ambiguous namespaces")
-	} else {
-		log.WithFields(fields).Warn("skip features with no matching namespace")
-	}
-
-	return nil, false
-}
-
-func (b *AncestryBuilder) ancestryFeatures(index int) []database.AncestryFeature {
-	ancestryFeatures := []database.AncestryFeature{}
-	for detector, features := range b.features {
-		for _, feature := range features {
-			if feature.IntroducedIn == index {
-				ancestryFeatures = append(ancestryFeatures, database.AncestryFeature{
-					NamespacedFeature: database.NamespacedFeature{
-						Feature:   feature.Feature.Feature,
-						Namespace: feature.Namespace.Namespace.Namespace,
-					},
-					FeatureBy:   detector,
-					NamespaceBy: feature.Namespace.Namespace.By,
-				})
-			}
-		}
-	}
-
-	return ancestryFeatures
-}
-
-func (b *AncestryBuilder) ancestryLayers() []database.AncestryLayer {
-	layers := make([]database.AncestryLayer, 0, b.layerIndex)
-	for i := 0; i < b.layerIndex; i++ {
-		layers = append(layers, database.AncestryLayer{
-			Hash:     b.layerNames[i],
-			Features: b.ancestryFeatures(i),
-		})
-	}
-
-	return layers
-}
-
-// Ancestry produces an Ancestry from the builder.
-func (b *AncestryBuilder) Ancestry(name string) *database.Ancestry {
-	if name == "" {
-		// TODO(sidac): we'll use the computed ancestry name in the future.
-		// During the transition, it still requires the user to use the correct
-		// ancestry name.
-		name = ancestryName(b.layerNames)
-		log.WithField("ancestry.Name", name).Warn("generated ancestry name since it's not specified")
-	}
-
-	return &database.Ancestry{
-		Name:   name,
-		By:     b.detectors,
-		Layers: b.ancestryLayers(),
-	}
-}
-
-// SaveAncestry saves an ancestry to the datastore.
-func SaveAncestry(store database.Datastore, ancestry *database.Ancestry) error {
-	log.WithField("ancestry.Name", ancestry.Name).Debug("saving ancestry")
-	features := []database.NamespacedFeature{}
-	for _, layer := range ancestry.Layers {
-		features = append(features, layer.GetFeatures()...)
-	}
-
-	if err := database.PersistNamespacedFeaturesAndCommit(store, features); err != nil {
-		return StorageError
-	}
-
-	if err := database.UpsertAncestryAndCommit(store, ancestry); err != nil {
-		return StorageError
-	}
-
-	if err := database.CacheRelatedVulnerabilityAndCommit(store, features); err != nil {
-		return StorageError
-	}
-
-	return nil
-}
-
-// IsAncestryCached checks if the ancestry is already cached in the database with the current set of detectors.
-func IsAncestryCached(store database.Datastore, name string, layerHashes []string) (bool, error) {
-	if name == "" {
-		// TODO(sidac): we'll use the computed ancestry name in the future.
-		// During the transition, it still requires the user to use the correct
-		// ancestry name.
-		name = ancestryName(layerHashes)
-		log.WithField("ancestry.Name", name).Warn("generated ancestry name since it's not specified")
-	}
-
-	ancestry, found, err := database.FindAncestryAndRollback(store, name)
-	if err != nil {
-		log.WithError(err).WithField("ancestry.Name", name).Error("failed to query ancestry in database")
-		return false, StorageError
-	}
-
-	if found {
-		if len(database.DiffDetectors(EnabledDetectors(), ancestry.By)) == 0 {
-			log.WithField("ancestry.Name", name).Debug("found cached ancestry")
-		} else {
-			log.WithField("ancestry.Name", name).Debug("found outdated ancestry cache")
-		}
-	} else {
-		log.WithField("ancestry.Name", name).Debug("ancestry not cached")
-	}
-
-	return found && len(database.DiffDetectors(EnabledDetectors(), ancestry.By)) == 0, nil
-}
-
-func ancestryName(layerHashes []string) string {
-	tag := sha256.Sum256([]byte(strings.Join(layerHashes, ",")))
-	return hex.EncodeToString(tag[:])
-}
--- a/ancestry_test.go
+++ b/ancestry_test.go
@ -1,297 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package clair
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/require"
-
-	"github.com/coreos/clair/database"
-)
-
-var (
-	dpkg       = database.NewFeatureDetector("dpkg", "1.0")
-	rpm        = database.NewFeatureDetector("rpm", "1.0")
-	pip        = database.NewFeatureDetector("pip", "1.0")
-	python     = database.NewNamespaceDetector("python", "1.0")
-	osrelease  = database.NewNamespaceDetector("os-release", "1.0")
-	aptsources = database.NewNamespaceDetector("apt-sources", "1.0")
-	ubuntu     = *database.NewNamespace("ubuntu:14.04", "dpkg")
-	ubuntu16   = *database.NewNamespace("ubuntu:16.04", "dpkg")
-	rhel7      = *database.NewNamespace("cpe:/o:redhat:enterprise_linux:7::computenode", "rpm")
-	debian     = *database.NewNamespace("debian:7", "dpkg")
-	python2    = *database.NewNamespace("python:2", "pip")
-	sed        = *database.NewSourcePackage("sed", "4.4-2", "dpkg")
-	sedByRPM   = *database.NewBinaryPackage("sed", "4.4-2", "rpm")
-	sedBin     = *database.NewBinaryPackage("sed", "4.4-2", "dpkg")
-	tar        = *database.NewBinaryPackage("tar", "1.29b-2", "dpkg")
-	scipy      = *database.NewSourcePackage("scipy", "3.0.0", "pip")
-
-	emptyNamespace = database.Namespace{}
-
-	detectors               = []database.Detector{dpkg, osrelease, rpm}
-	multinamespaceDetectors = []database.Detector{dpkg, osrelease, pip}
-)
-
-type ancestryBuilder struct {
-	ancestry *database.Ancestry
-}
-
-func newAncestryBuilder(name string) *ancestryBuilder {
-	return &ancestryBuilder{&database.Ancestry{Name: name}}
-}
-
-func (b *ancestryBuilder) addDetectors(d ...database.Detector) *ancestryBuilder {
-	b.ancestry.By = append(b.ancestry.By, d...)
-	return b
-}
-
-func (b *ancestryBuilder) addLayer(hash string, f ...database.AncestryFeature) *ancestryBuilder {
-	l := database.AncestryLayer{Hash: hash}
-	l.Features = append(l.Features, f...)
-	b.ancestry.Layers = append(b.ancestry.Layers, l)
-	return b
-}
-
-func ancestryFeature(namespace database.Namespace, feature database.Feature, nsBy database.Detector, fBy database.Detector) database.AncestryFeature {
-	return database.AncestryFeature{
-		NamespacedFeature: database.NamespacedFeature{feature, namespace},
-		FeatureBy:         fBy,
-		NamespaceBy:       nsBy,
-	}
-}
-
-// layerBuilder is for helping constructing the layer test artifacts.
-type layerBuilder struct {
-	layer *database.Layer
-}
-
-func newLayerBuilder(hash string) *layerBuilder {
-	return &layerBuilder{&database.Layer{Hash: hash, By: detectors}}
-}
-
-func newLayerBuilderWithoutDetector(hash string) *layerBuilder {
-	return &layerBuilder{&database.Layer{Hash: hash}}
-}
-
-func (b *layerBuilder) addDetectors(d ...database.Detector) *layerBuilder {
-	b.layer.By = append(b.layer.By, d...)
-	return b
-}
-
-func (b *layerBuilder) addNamespace(detector database.Detector, ns database.Namespace) *layerBuilder {
-	b.layer.Namespaces = append(b.layer.Namespaces, database.LayerNamespace{
-		Namespace: ns,
-		By:        detector,
-	})
-	return b
-}
-
-func (b *layerBuilder) addFeature(detector database.Detector, f database.Feature, ns database.Namespace) *layerBuilder {
-	b.layer.Features = append(b.layer.Features, database.LayerFeature{
-		Feature:            f,
-		By:                 detector,
-		PotentialNamespace: ns,
-	})
-
-	return b
-}
-
-var testImage = []*database.Layer{
-	// empty layer
-	newLayerBuilder("0").layer,
-	// ubuntu namespace
-	newLayerBuilder("1").addNamespace(osrelease, ubuntu).layer,
-	// install sed
-	newLayerBuilder("2").addFeature(dpkg, sed, emptyNamespace).layer,
-	// install tar
-	newLayerBuilder("3").addFeature(dpkg, sed, emptyNamespace).addFeature(dpkg, tar, emptyNamespace).layer,
-	// remove tar
-	newLayerBuilder("4").addFeature(dpkg, sed, emptyNamespace).layer,
-	// upgrade ubuntu
-	newLayerBuilder("5").addNamespace(osrelease, ubuntu16).layer,
-	// no change to the detectable files
-	newLayerBuilder("6").layer,
-	// change to the package installer database but no features are affected.
-	newLayerBuilder("7").addFeature(dpkg, sed, emptyNamespace).layer,
-}
-
-var invalidNamespace = []*database.Layer{
-	// add package without namespace, this indicates that the namespace detector
-	// could not detect the namespace.
-	newLayerBuilder("0").addFeature(dpkg, sed, emptyNamespace).layer,
-}
-
-var noMatchingNamespace = []*database.Layer{
-	newLayerBuilder("0").addFeature(rpm, sedByRPM, emptyNamespace).addFeature(dpkg, sed, emptyNamespace).addNamespace(osrelease, ubuntu).layer,
-}
-
-var multiplePackagesOnFirstLayer = []*database.Layer{
-	newLayerBuilder("0").addFeature(dpkg, sed, emptyNamespace).addFeature(dpkg, tar, emptyNamespace).addFeature(dpkg, sedBin, emptyNamespace).addNamespace(osrelease, ubuntu16).layer,
-}
-
-var twoNamespaceDetectorsWithSameResult = []*database.Layer{
-	newLayerBuilderWithoutDetector("0").addDetectors(dpkg, aptsources, osrelease).addFeature(dpkg, sed, emptyNamespace).addNamespace(aptsources, ubuntu).addNamespace(osrelease, ubuntu).layer,
-}
-
-var sameVersionFormatDiffName = []*database.Layer{
-	newLayerBuilder("0").addFeature(dpkg, sed, emptyNamespace).addNamespace(aptsources, ubuntu).addNamespace(osrelease, debian).layer,
-}
-
-var potentialFeatureNamespace = []*database.Layer{
-	newLayerBuilder("0").addFeature(rpm, sed, rhel7).layer,
-}
-
-func TestAddLayer(t *testing.T) {
-	cases := []struct {
-		title               string
-		image               []*database.Layer
-		nonDefaultDetectors []database.Detector
-		expectedAncestry    database.Ancestry
-	}{
-		{
-			title:            "empty image",
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{})).addDetectors(detectors...).ancestry,
-		},
-		{
-			title: "empty layer",
-			image: testImage[:1],
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0"})).addDetectors(detectors...).
-				addLayer("0").ancestry,
-		},
-		{
-			title: "ubuntu",
-			image: testImage[:2],
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0", "1"})).addDetectors(detectors...).
-				addLayer("0").
-				addLayer("1").ancestry,
-		},
-		{
-			title: "ubuntu install sed",
-			image: testImage[:3],
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0", "1", "2"})).addDetectors(detectors...).
-				addLayer("0").
-				addLayer("1").
-				addLayer("2", ancestryFeature(ubuntu, sed, osrelease, dpkg)).ancestry,
-		},
-		{
-			title: "ubuntu install tar",
-			image: testImage[:4],
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0", "1", "2", "3"})).addDetectors(detectors...).
-				addLayer("0").
-				addLayer("1").
-				addLayer("2", ancestryFeature(ubuntu, sed, osrelease, dpkg)).
-				addLayer("3", ancestryFeature(ubuntu, tar, osrelease, dpkg)).ancestry,
-		}, {
-			title: "ubuntu uninstall tar",
-			image: testImage[:5],
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0", "1", "2", "3", "4"})).addDetectors(detectors...).
-				addLayer("0").
-				addLayer("1").
-				addLayer("2", ancestryFeature(ubuntu, sed, osrelease, dpkg)).
-				addLayer("3").
-				addLayer("4").ancestry,
-		}, {
-			title: "ubuntu upgrade",
-			image: testImage[:6],
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0", "1", "2", "3", "4", "5"})).addDetectors(detectors...).
-				addLayer("0").
-				addLayer("1").
-				addLayer("2").
-				addLayer("3").
-				addLayer("4").
-				addLayer("5", ancestryFeature(ubuntu16, sed, osrelease, dpkg)).ancestry,
-		}, {
-			title: "no change to the detectable files",
-			image: testImage[:7],
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0", "1", "2", "3", "4", "5", "6"})).addDetectors(detectors...).
-				addLayer("0").
-				addLayer("1").
-				addLayer("2").
-				addLayer("3").
-				addLayer("4").
-				addLayer("5", ancestryFeature(ubuntu16, sed, osrelease, dpkg)).
-				addLayer("6").ancestry,
-		}, {
-			title: "change to the package installer database but no features are affected.",
-			image: testImage[:8],
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0", "1", "2", "3", "4", "5", "6", "7"})).addDetectors(detectors...).
-				addLayer("0").
-				addLayer("1").
-				addLayer("2").
-				addLayer("3").
-				addLayer("4").
-				addLayer("5", ancestryFeature(ubuntu16, sed, osrelease, dpkg)).
-				addLayer("6").
-				addLayer("7").ancestry,
-		}, {
-			title: "layers with features and namespace.",
-			image: multiplePackagesOnFirstLayer,
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0"})).addDetectors(detectors...).
-				addLayer("0",
-					ancestryFeature(ubuntu16, sed, osrelease, dpkg),
-					ancestryFeature(ubuntu16, sedBin, osrelease, dpkg),
-					ancestryFeature(ubuntu16, tar, osrelease, dpkg)).
-				ancestry,
-		}, {
-			title:               "two namespace detectors giving same namespace.",
-			image:               twoNamespaceDetectorsWithSameResult,
-			nonDefaultDetectors: []database.Detector{osrelease, aptsources, dpkg},
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0"})).addDetectors(osrelease, aptsources, dpkg).
-				addLayer("0", ancestryFeature(ubuntu, sed, aptsources, dpkg)).
-				ancestry,
-		}, {
-			title: "feature without namespace",
-			image: invalidNamespace,
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0"})).addDetectors(detectors...).
-				addLayer("0").
-				ancestry,
-		}, {
-			title: "two namespaces with the same version format but different names",
-			image: sameVersionFormatDiffName,
-			// failure of matching a namespace will result in the package not being added.
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0"})).addDetectors(detectors...).
-				addLayer("0").
-				ancestry,
-		}, {
-			title:            "noMatchingNamespace",
-			image:            noMatchingNamespace,
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0"})).addDetectors(detectors...).addLayer("0", ancestryFeature(ubuntu, sed, osrelease, dpkg)).ancestry,
-		}, {
-			title:            "featureWithPotentialNamespace",
-			image:            potentialFeatureNamespace,
-			expectedAncestry: *newAncestryBuilder(ancestryName([]string{"0"})).addDetectors(detectors...).addLayer("0", ancestryFeature(rhel7, sed, database.Detector{}, rpm)).ancestry,
-		},
-	}
-
-	for _, test := range cases {
-		t.Run(test.title, func(t *testing.T) {
-			var builder *AncestryBuilder
-			if len(test.nonDefaultDetectors) != 0 {
-				builder = NewAncestryBuilder(test.nonDefaultDetectors)
-			} else {
-				builder = NewAncestryBuilder(detectors)
-			}
-
-			for _, layer := range test.image {
-				builder.AddLeafLayer(layer)
-			}
-
-			ancestry := builder.Ancestry("")
-			require.True(t, database.AssertAncestryEqual(t, &test.expectedAncestry, ancestry))
-		})
-	}
-}
--- a/api/api.go
+++ b/api/api.go
@ -1,4 +1,4 @@
-// Copyright 2018 clair authors
+// Copyright 2017 clair authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@ -15,11 +15,15 @@
 package api

 import (
-	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"io/ioutil"
+	"net"
 	"net/http"
 	"time"

 	log "github.com/sirupsen/logrus"
+	"github.com/tylerb/graceful"

 	"github.com/coreos/clair/api/v3"
 	"github.com/coreos/clair/database"
@ -37,10 +41,14 @@ type Config struct {
 }

 func Run(cfg *Config, store database.Datastore) {
-	err := v3.ListenAndServe(cfg.Addr, cfg.CertFile, cfg.KeyFile, cfg.CAFile, store)
+	tlsConfig, err := tlsClientConfig(cfg.CAFile)
 	if err != nil {
-		log.WithError(err).Fatal("could not initialize gRPC server")
+		log.WithError(err).Fatal("could not initialize client cert authentication")
 	}
+	if tlsConfig != nil {
+		log.Info("main API configured with client certificate authentication")
+	}
+	v3.Run(cfg.Addr, tlsConfig, cfg.CertFile, cfg.KeyFile, store)
 }

 func RunHealth(cfg *Config, store database.Datastore, st *stopper.Stopper) {
@ -53,20 +61,67 @@ func RunHealth(cfg *Config, store database.Datastore, st *stopper.Stopper) {
 	}
 	log.WithField("addr", cfg.HealthAddr).Info("starting health API")

-	srv := http.Server{
+	srv := &graceful.Server{
+		Timeout:          10 * time.Second, // Interrupt health checks when stopping
+		NoSignalHandling: true,             // We want to use our own Stopper
+		Server: &http.Server{
 			Addr:    cfg.HealthAddr,
 			Handler: http.TimeoutHandler(newHealthHandler(store), cfg.Timeout, timeoutResponse),
+		},
 	}

-	go func() {
-		<-st.Chan()
-		srv.Shutdown(context.TODO())
-	}()
-
-	err := srv.ListenAndServe()
-	if err != nil && err != http.ErrServerClosed {
-		log.Fatal(err)
-	}
+	listenAndServeWithStopper(srv, st, "", "")

 	log.Info("health API stopped")
 }
+
+// listenAndServeWithStopper wraps graceful.Server's
+// ListenAndServe/ListenAndServeTLS and adds the ability to interrupt them with
+// the provided stopper.Stopper.
+func listenAndServeWithStopper(srv *graceful.Server, st *stopper.Stopper, certFile, keyFile string) {
+	go func() {
+		<-st.Chan()
+		srv.Stop(0)
+	}()
+
+	var err error
+	if certFile != "" && keyFile != "" {
+		log.Info("API: TLS Enabled")
+		err = srv.ListenAndServeTLS(certFile, keyFile)
+	} else {
+		err = srv.ListenAndServe()
+	}
+
+	if err != nil {
+		if opErr, ok := err.(*net.OpError); !ok || (ok && opErr.Op != "accept") {
+			log.Fatal(err)
+		}
+	}
+}
+
+// tlsClientConfig initializes a *tls.Config using the given CA. The resulting
+// *tls.Config is meant to be used to configure an HTTP server to do client
+// certificate authentication.
+//
+// If no CA is given, a nil *tls.Config is returned; no client certificate will
+// be required and verified. In other words, authentication will be disabled.
+func tlsClientConfig(caPath string) (*tls.Config, error) {
+	if caPath == "" {
+		return nil, nil
+	}
+
+	caCert, err := ioutil.ReadFile(caPath)
+	if err != nil {
+		return nil, err
+	}
+
+	caCertPool := x509.NewCertPool()
+	caCertPool.AppendCertsFromPEM(caCert)
+
+	tlsConfig := &tls.Config{
+		ClientCAs:  caCertPool,
+		ClientAuth: tls.RequireAndVerifyClientCert,
+	}
+
+	return tlsConfig, nil
+}
--- a/api/httputil/httputil.go
+++ b/api/httputil/httputil.go
@ -0,0 +1,24 @@
+package httputil
+
+import (
+	"net"
+	"net/http"
+	"strings"
+)
+
+// GetClientAddr returns the first value in X-Forwarded-For if it exists
+// otherwise fall back to use RemoteAddr
+func GetClientAddr(r *http.Request) string {
+	addr := r.RemoteAddr
+	if s := r.Header.Get("X-Forwarded-For"); s != "" {
+		ips := strings.Split(s, ",")
+		// assume the first one is the client address
+		if len(ips) != 0 {
+			// validate the ip
+			if realIP := net.ParseIP(ips[0]); realIP != nil {
+				addr = strings.TrimSpace(ips[0])
+			}
+		}
+	}
+	return addr
+}
--- a/api/v3/clairpb/Dockerfile
+++ b/api/v3/clairpb/Dockerfile
@ -1,7 +0,0 @@
-FROM golang:alpine
-
-RUN apk add --update --no-cache git bash protobuf-dev
-
-RUN go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
-RUN go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
-RUN go get -u github.com/golang/protobuf/protoc-gen-go
--- a/api/v3/clairpb/Makefile
+++ b/api/v3/clairpb/Makefile
@ -0,0 +1,17 @@
+all:
+	protoc -I/usr/local/include -I. \
+		-I${GOPATH}/src \
+		-I${GOPATH}/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis \
+		--go_out=plugins=grpc:. \
+		clair.proto
+	protoc -I/usr/local/include -I. \
+		-I${GOPATH}/src \
+		-I${GOPATH}/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis \
+		--grpc-gateway_out=logtostderr=true:. \
+		clair.proto
+	protoc -I/usr/local/include -I. \
+		-I${GOPATH}/src \
+		-I${GOPATH}/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis \
+		--swagger_out=logtostderr=true:. \
+		clair.proto
+	go generate .
--- a/api/v3/clairpb/clair.pb.go
+++ b/api/v3/clairpb/clair.pb.go
--- a/api/v3/clairpb/clair.pb.gw.go
+++ b/api/v3/clairpb/clair.pb.gw.go
@ -1,5 +1,6 @@
-// Code generated by protoc-gen-grpc-gateway. DO NOT EDIT.
-// source: api/v3/clairpb/clair.proto
+// Code generated by protoc-gen-grpc-gateway
+// source: clair.proto
+// DO NOT EDIT!

 /*
 Package clairpb is a reverse proxy.
@ -28,6 +29,23 @@ var _ status.Status
 var _ = runtime.String
 var _ = utilities.NewDoubleArray

+func request_AncestryService_PostAncestry_0(ctx context.Context, marshaler runtime.Marshaler, client AncestryServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq PostAncestryRequest
+	var metadata runtime.ServerMetadata
+
+	if err := marshaler.NewDecoder(req.Body).Decode(&protoReq); err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := client.PostAncestry(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
+var (
+	filter_AncestryService_GetAncestry_0 = &utilities.DoubleArray{Encoding: map[string]int{"ancestry_name": 0}, Base: []int{1, 1, 0}, Check: []int{0, 1, 2}}
+)
+
 func request_AncestryService_GetAncestry_0(ctx context.Context, marshaler runtime.Marshaler, client AncestryServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
 	var protoReq GetAncestryRequest
 	var metadata runtime.ServerMetadata
@ -47,7 +65,11 @@ func request_AncestryService_GetAncestry_0(ctx context.Context, marshaler runtim
 	protoReq.AncestryName, err = runtime.String(val)

 	if err != nil {
-		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "ancestry_name", err)
+		return nil, metadata, err
+	}
+
+	if err := runtime.PopulateQueryParameters(&protoReq, req.URL.Query(), filter_AncestryService_GetAncestry_0); err != nil {
+		return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
 	}

 	msg, err := client.GetAncestry(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
@ -55,21 +77,6 @@ func request_AncestryService_GetAncestry_0(ctx context.Context, marshaler runtim

 }

-func request_AncestryService_PostAncestry_0(ctx context.Context, marshaler runtime.Marshaler, client AncestryServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
-	var protoReq PostAncestryRequest
-	var metadata runtime.ServerMetadata
-
-	if req.ContentLength > 0 {
-		if err := marshaler.NewDecoder(req.Body).Decode(&protoReq); err != nil {
-			return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
-		}
-	}
-
-	msg, err := client.PostAncestry(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
-	return msg, metadata, err
-
-}
-
 var (
 	filter_NotificationService_GetNotification_0 = &utilities.DoubleArray{Encoding: map[string]int{"name": 0}, Base: []int{1, 1, 0}, Check: []int{0, 1, 2}}
 )
@ -93,7 +100,7 @@ func request_NotificationService_GetNotification_0(ctx context.Context, marshale
 	protoReq.Name, err = runtime.String(val)

 	if err != nil {
-		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "name", err)
+		return nil, metadata, err
 	}

 	if err := runtime.PopulateQueryParameters(&protoReq, req.URL.Query(), filter_NotificationService_GetNotification_0); err != nil {
@ -124,7 +131,7 @@ func request_NotificationService_MarkNotificationAsRead_0(ctx context.Context, m
 	protoReq.Name, err = runtime.String(val)

 	if err != nil {
-		return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "name", err)
+		return nil, metadata, err
 	}

 	msg, err := client.MarkNotificationAsRead(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
@ -132,15 +139,6 @@ func request_NotificationService_MarkNotificationAsRead_0(ctx context.Context, m

 }

-func request_StatusService_GetStatus_0(ctx context.Context, marshaler runtime.Marshaler, client StatusServiceClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
-	var protoReq GetStatusRequest
-	var metadata runtime.ServerMetadata
-
-	msg, err := client.GetStatus(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
-	return msg, metadata, err
-
-}
-
 // RegisterAncestryServiceHandlerFromEndpoint is same as RegisterAncestryServiceHandler but
 // automatically dials to "endpoint" and closes the connection when "ctx" gets done.
 func RegisterAncestryServiceHandlerFromEndpoint(ctx context.Context, mux *runtime.ServeMux, endpoint string, opts []grpc.DialOption) (err error) {
@ -169,47 +167,10 @@ func RegisterAncestryServiceHandlerFromEndpoint(ctx context.Context, mux *runtim
 // RegisterAncestryServiceHandler registers the http handlers for service AncestryService to "mux".
 // The handlers forward requests to the grpc endpoint over "conn".
 func RegisterAncestryServiceHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
-	return RegisterAncestryServiceHandlerClient(ctx, mux, NewAncestryServiceClient(conn))
-}
-
-// RegisterAncestryServiceHandler registers the http handlers for service AncestryService to "mux".
-// The handlers forward requests to the grpc endpoint over the given implementation of "AncestryServiceClient".
-// Note: the gRPC framework executes interceptors within the gRPC handler. If the passed in "AncestryServiceClient"
-// doesn't go through the normal gRPC flow (creating a gRPC client etc.) then it will be up to the passed in
-// "AncestryServiceClient" to call the correct interceptors.
-func RegisterAncestryServiceHandlerClient(ctx context.Context, mux *runtime.ServeMux, client AncestryServiceClient) error {
-
-	mux.Handle("GET", pattern_AncestryService_GetAncestry_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
-		ctx, cancel := context.WithCancel(req.Context())
-		defer cancel()
-		if cn, ok := w.(http.CloseNotifier); ok {
-			go func(done <-chan struct{}, closed <-chan bool) {
-				select {
-				case <-done:
-				case <-closed:
-					cancel()
-				}
-			}(ctx.Done(), cn.CloseNotify())
-		}
-		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
-		rctx, err := runtime.AnnotateContext(ctx, mux, req)
-		if err != nil {
-			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
-			return
-		}
-		resp, md, err := request_AncestryService_GetAncestry_0(rctx, inboundMarshaler, client, req, pathParams)
-		ctx = runtime.NewServerMetadataContext(ctx, md)
-		if err != nil {
-			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
-			return
-		}
-
-		forward_AncestryService_GetAncestry_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
-
-	})
+	client := NewAncestryServiceClient(conn)

 	mux.Handle("POST", pattern_AncestryService_PostAncestry_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
-		ctx, cancel := context.WithCancel(req.Context())
+		ctx, cancel := context.WithCancel(ctx)
 		defer cancel()
 		if cn, ok := w.(http.CloseNotifier); ok {
 			go func(done <-chan struct{}, closed <-chan bool) {
@ -237,19 +198,48 @@ func RegisterAncestryServiceHandlerClient(ctx context.Context, mux *runtime.Serv

 	})

+	mux.Handle("GET", pattern_AncestryService_GetAncestry_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(ctx)
+		defer cancel()
+		if cn, ok := w.(http.CloseNotifier); ok {
+			go func(done <-chan struct{}, closed <-chan bool) {
+				select {
+				case <-done:
+				case <-closed:
+					cancel()
+				}
+			}(ctx.Done(), cn.CloseNotify())
+		}
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateContext(ctx, mux, req)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+		resp, md, err := request_AncestryService_GetAncestry_0(rctx, inboundMarshaler, client, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_AncestryService_GetAncestry_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	return nil
 }

 var (
-	pattern_AncestryService_GetAncestry_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 1, 0, 4, 1, 5, 1}, []string{"ancestry", "ancestry_name"}, ""))
-
 	pattern_AncestryService_PostAncestry_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0}, []string{"ancestry"}, ""))
+
+	pattern_AncestryService_GetAncestry_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 1, 0, 4, 1, 5, 1}, []string{"ancestry", "ancestry_name"}, ""))
 )

 var (
-	forward_AncestryService_GetAncestry_0 = runtime.ForwardResponseMessage
-
 	forward_AncestryService_PostAncestry_0 = runtime.ForwardResponseMessage
+
+	forward_AncestryService_GetAncestry_0 = runtime.ForwardResponseMessage
 )

 // RegisterNotificationServiceHandlerFromEndpoint is same as RegisterNotificationServiceHandler but
@ -280,18 +270,10 @@ func RegisterNotificationServiceHandlerFromEndpoint(ctx context.Context, mux *ru
 // RegisterNotificationServiceHandler registers the http handlers for service NotificationService to "mux".
 // The handlers forward requests to the grpc endpoint over "conn".
 func RegisterNotificationServiceHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
-	return RegisterNotificationServiceHandlerClient(ctx, mux, NewNotificationServiceClient(conn))
-}
-
-// RegisterNotificationServiceHandler registers the http handlers for service NotificationService to "mux".
-// The handlers forward requests to the grpc endpoint over the given implementation of "NotificationServiceClient".
-// Note: the gRPC framework executes interceptors within the gRPC handler. If the passed in "NotificationServiceClient"
-// doesn't go through the normal gRPC flow (creating a gRPC client etc.) then it will be up to the passed in
-// "NotificationServiceClient" to call the correct interceptors.
-func RegisterNotificationServiceHandlerClient(ctx context.Context, mux *runtime.ServeMux, client NotificationServiceClient) error {
+	client := NewNotificationServiceClient(conn)

 	mux.Handle("GET", pattern_NotificationService_GetNotification_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
-		ctx, cancel := context.WithCancel(req.Context())
+		ctx, cancel := context.WithCancel(ctx)
 		defer cancel()
 		if cn, ok := w.(http.CloseNotifier); ok {
 			go func(done <-chan struct{}, closed <-chan bool) {
@ -320,7 +302,7 @@ func RegisterNotificationServiceHandlerClient(ctx context.Context, mux *runtime.
 	})

 	mux.Handle("DELETE", pattern_NotificationService_MarkNotificationAsRead_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
-		ctx, cancel := context.WithCancel(req.Context())
+		ctx, cancel := context.WithCancel(ctx)
 		defer cancel()
 		if cn, ok := w.(http.CloseNotifier); ok {
 			go func(done <-chan struct{}, closed <-chan bool) {
@ -362,81 +344,3 @@ var (

 	forward_NotificationService_MarkNotificationAsRead_0 = runtime.ForwardResponseMessage
 )
-
-// RegisterStatusServiceHandlerFromEndpoint is same as RegisterStatusServiceHandler but
-// automatically dials to "endpoint" and closes the connection when "ctx" gets done.
-func RegisterStatusServiceHandlerFromEndpoint(ctx context.Context, mux *runtime.ServeMux, endpoint string, opts []grpc.DialOption) (err error) {
-	conn, err := grpc.Dial(endpoint, opts...)
-	if err != nil {
-		return err
-	}
-	defer func() {
-		if err != nil {
-			if cerr := conn.Close(); cerr != nil {
-				grpclog.Printf("Failed to close conn to %s: %v", endpoint, cerr)
-			}
-			return
-		}
-		go func() {
-			<-ctx.Done()
-			if cerr := conn.Close(); cerr != nil {
-				grpclog.Printf("Failed to close conn to %s: %v", endpoint, cerr)
-			}
-		}()
-	}()
-
-	return RegisterStatusServiceHandler(ctx, mux, conn)
-}
-
-// RegisterStatusServiceHandler registers the http handlers for service StatusService to "mux".
-// The handlers forward requests to the grpc endpoint over "conn".
-func RegisterStatusServiceHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
-	return RegisterStatusServiceHandlerClient(ctx, mux, NewStatusServiceClient(conn))
-}
-
-// RegisterStatusServiceHandler registers the http handlers for service StatusService to "mux".
-// The handlers forward requests to the grpc endpoint over the given implementation of "StatusServiceClient".
-// Note: the gRPC framework executes interceptors within the gRPC handler. If the passed in "StatusServiceClient"
-// doesn't go through the normal gRPC flow (creating a gRPC client etc.) then it will be up to the passed in
-// "StatusServiceClient" to call the correct interceptors.
-func RegisterStatusServiceHandlerClient(ctx context.Context, mux *runtime.ServeMux, client StatusServiceClient) error {
-
-	mux.Handle("GET", pattern_StatusService_GetStatus_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
-		ctx, cancel := context.WithCancel(req.Context())
-		defer cancel()
-		if cn, ok := w.(http.CloseNotifier); ok {
-			go func(done <-chan struct{}, closed <-chan bool) {
-				select {
-				case <-done:
-				case <-closed:
-					cancel()
-				}
-			}(ctx.Done(), cn.CloseNotify())
-		}
-		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
-		rctx, err := runtime.AnnotateContext(ctx, mux, req)
-		if err != nil {
-			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
-			return
-		}
-		resp, md, err := request_StatusService_GetStatus_0(rctx, inboundMarshaler, client, req, pathParams)
-		ctx = runtime.NewServerMetadataContext(ctx, md)
-		if err != nil {
-			runtime.HTTPError(ctx, mux, outboundMarshaler, w, req, err)
-			return
-		}
-
-		forward_StatusService_GetStatus_0(ctx, mux, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
-
-	})
-
-	return nil
-}
-
-var (
-	pattern_StatusService_GetStatus_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0}, []string{"status"}, ""))
-)
-
-var (
-	forward_StatusService_GetStatus_0 = runtime.ForwardResponseMessage
-)
--- a/api/v3/clairpb/clair.proto
+++ b/api/v3/clairpb/clair.proto
@ -1,4 +1,4 @@
-// Copyright 2018 clair authors
+// Copyright 2017 clair authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@ -13,236 +13,150 @@
 // limitations under the License.

 syntax = "proto3";
+option go_package = "clairpb";

+package clairpb;
+import "google/api/annotations.proto";
+import "google/protobuf/empty.proto";
 import "google/protobuf/timestamp.proto";

-import "google/api/annotations.proto";
+message Vulnerability {
+	string name = 1;
+	string namespace_name = 2;
+	string description = 3;
+	string link = 4;
+	string severity = 5;
+	string metadata = 6;
+	// fixed_by exists when vulnerability is under feature.
+	string fixed_by = 7;
+	// affected_versions exists when vulnerability is under notification.
+	repeated Feature affected_versions = 8;
+}

-package coreos.clair;
+message ClairStatus {
+	// listers and detectors are processors implemented in this Clair and used to
+	// scan ancestries
+	repeated string listers = 1;
+	repeated string detectors = 2;
+	google.protobuf.Timestamp last_update_time = 3;
+}

-option go_package = "clairpb";
-option java_package = "com.coreos.clair.pb";
+message Feature{
+	string name = 1;
+	string namespace_name = 2;
+	string version = 3;
+	string version_format = 4;
+	repeated Vulnerability vulnerabilities = 5;
+}

-service AncestryService {
-  // The RPC used to read the results of scanning for a particular ancestry.
-  rpc GetAncestry(GetAncestryRequest) returns (GetAncestryResponse) {
-    option (google.api.http) = { get: "/ancestry/{ancestry_name}" };
+message Ancestry {
+	string name = 1;
+	repeated Feature features = 2;
+	repeated Layer layers = 3;
+
+	// scanned_listers and scanned_detectors are used to scan this ancestry, it
+	// may be different from listers and detectors in ClairStatus since the
+	// ancestry could be scanned by previous version of Clair.
+	repeated string scanned_listers = 4;
+	repeated string scanned_detectors = 5;
+}
+
+message Layer {
+	string hash = 1;
+}
+
+message Notification {
+	string name = 1;
+	string created = 2;
+	string notified = 3;
+	string deleted = 4;	
+	PagedVulnerableAncestries old = 5;
+	PagedVulnerableAncestries new = 6;
+}
+
+message IndexedAncestryName {
+	// index is unique to name in all streams simultaneously streamed, increasing
+	// and larger than all indexes in previous page in same stream.
+	int32 index = 1;
+	string name = 2;
+}
+
+message PagedVulnerableAncestries {
+	string current_page = 1;
+	// if next_page is empty, it signals the end of all pages.
+	string next_page = 2;
+	int32 limit = 3;	
+	Vulnerability vulnerability = 4;
+	repeated IndexedAncestryName ancestries = 5;
+}
+
+message PostAncestryRequest {
+	message PostLayer {
+		string hash = 1;
+		string path = 2;
+		map<string, string> headers = 3;
 	}
-  // The RPC used to create a new scan of an ancestry.
+	string ancestry_name = 1;
+	string format = 2;
+	repeated PostLayer layers = 3;
+}
+
+message PostAncestryResponse {
+	ClairStatus status = 1; 
+}
+
+message GetAncestryRequest {
+	string ancestry_name = 1;
+	bool with_vulnerabilities = 2;
+	bool with_features = 3;
+}
+
+message GetAncestryResponse {
+	Ancestry ancestry = 1;
+	ClairStatus status = 2; 
+}
+
+message GetNotificationRequest {
+	// if the vulnerability_page is empty, it implies the first page.
+	string old_vulnerability_page = 1;
+	string new_vulnerability_page = 2;
+	int32 limit = 3;
+	string name = 4;
+}
+
+message GetNotificationResponse {
+	Notification notification = 1;
+}
+
+message MarkNotificationAsReadRequest {
+	string name = 1;
+}
+
+service AncestryService{
 	rpc PostAncestry(PostAncestryRequest) returns (PostAncestryResponse) {
 		option (google.api.http) = {
 			post: "/ancestry"
 			body: "*"
 		};
 	}
-}

-service StatusService {
-  // The RPC used to show the internal state of current Clair instance.
-  rpc GetStatus(GetStatusRequest) returns (GetStatusResponse) {
-    option (google.api.http) = { get: "/status" };
+	rpc GetAncestry(GetAncestryRequest) returns (GetAncestryResponse) {
+		option (google.api.http) = {
+			get: "/ancestry/{ancestry_name}"
+		};
 	}
 }

-service NotificationService {
-  // The RPC used to get a particularly Notification.
+service NotificationService{
 	rpc GetNotification(GetNotificationRequest) returns (GetNotificationResponse) {
-    option (google.api.http) = { get: "/notifications/{name}" };
+		option (google.api.http) = {
+			get: "/notifications/{name}"
+		};
 	}
-  // The RPC used to mark a Notification as read after it has been processed.
-  rpc MarkNotificationAsRead(MarkNotificationAsReadRequest) returns (MarkNotificationAsReadResponse) {
-    option (google.api.http) = { delete: "/notifications/{name}" };
+
+	rpc MarkNotificationAsRead(MarkNotificationAsReadRequest) returns (google.protobuf.Empty) {
+		option (google.api.http) = {
+			delete: "/notifications/{name}"
+		};
 	}
 }
-
-message Vulnerability {
-  // The name of the vulnerability.
-  string name = 1;
-  // The name of the namespace in which the vulnerability was detected.
-  string namespace_name = 2;
-  // A description of the vulnerability according to the source for the namespace.
-  string description = 3;
-  // A link to the vulnerability according to the source for the namespace.
-  string link = 4;
-  // How dangerous the vulnerability is.
-  string severity = 5;
-  // Namespace agnostic metadata about the vulnerability.
-  string metadata = 6;
-  // The feature that fixes this vulnerability.
-  // This field only exists when a vulnerability is a part of a Feature.
-  string fixed_by = 7;
-  // The Features that are affected by the vulnerability.
-  // This field only exists when a vulnerability is a part of a Notification.
-  repeated Feature affected_versions = 8;
-}
-
-message Detector {
-  enum DType {
-    DETECTOR_D_TYPE_INVALID = 0;
-    DETECTOR_D_TYPE_NAMESPACE = 1;
-    DETECTOR_D_TYPE_FEATURE = 2;
-  }
-  // The name of the detector.
-  string name = 1;
-  // The version of the detector.
-  string version = 2;
-  // The type of the detector.
-  DType dtype = 3;
-}
-
-message Namespace {
-  // The name of the namespace.
-  string name = 1;
-  // The detector used to detect the namespace. This only exists when present in
-  // an Ancestry Feature.
-  Detector detector = 2;
-}
-
-message Feature {
-  // The name of the feature.
-  string name = 1;
-  // The namespace in which the feature is detected.
-  Namespace namespace = 2;
-  // The specific version of this feature.
-  string version = 3;
-  // The format used to parse version numbers for the feature.
-  string version_format = 4;
-  // The detector used to detect this feature. This only exists when present in
-  // an Ancestry.
-  Detector detector = 5;
-  // The list of vulnerabilities that affect the feature.
-  repeated Vulnerability vulnerabilities = 6;
-  // The feature type indicates if the feature represents a source package or
-  // binary package.
-  string feature_type = 7;
-}
-
-message Layer {
-  // The sha256 tarsum for the layer.
-  string hash = 1;
-}
-
-message ClairStatus {
-  // The implemented detectors in this Clair instance
-  repeated Detector detectors = 1;
-  // The time at which the updater last ran.
-  google.protobuf.Timestamp last_update_time = 2;
-}
-
-message GetAncestryRequest {
-  // The name of the desired ancestry.
-  string ancestry_name = 1;
-}
-
-message GetAncestryResponse {
-  message AncestryLayer {
-    // The layer's information.
-    Layer layer = 1;
-    // The features detected in this layer.
-    repeated Feature detected_features = 2;
-  }
-  message Ancestry {
-    // The name of the desired ancestry.
-    string name = 1;
-    // The detectors used to scan this Ancestry. It may not be the current set
-    // of detectors in clair status.
-    repeated Detector detectors = 2;
-    // The list of layers along with detected features in each.
-    repeated AncestryLayer layers = 3;
-  }
-  // The ancestry requested.
-  Ancestry ancestry = 1;
-  // The status of Clair at the time of the request.
-  ClairStatus status = 2;
-}
-
-message PostAncestryRequest {
-  message PostLayer {
-    // The hash of the layer.
-    string hash = 1;
-    // The location of the layer (URL or file path).
-    string path = 2;
-    // Any HTTP Headers that need to be used if requesting a layer over HTTP(S).
-    map<string, string> headers = 3;
-  }
-  // The name of the ancestry being scanned.
-  // If scanning OCI images, this should be the hash of the manifest.
-  string ancestry_name = 1;
-  // The format of the image being uploaded.
-  string format = 2;
-  // The layers to be scanned for this Ancestry, ordered in the way that i th
-  // layer is the parent of i + 1 th layer.
-  repeated PostLayer layers = 3;
-}
-
-message PostAncestryResponse {
-  // The status of Clair at the time of the request.
-  ClairStatus status = 1;
-}
-
-message GetNotificationRequest {
-  // The current page of previous vulnerabilities for the ancestry.
-  // This will be empty when it is the first page.
-  string old_vulnerability_page = 1;
-  // The current page of vulnerabilities for the ancestry.
-  // This will be empty when it is the first page.
-  string new_vulnerability_page = 2;
-  // The requested maximum number of results per page.
-  int32 limit = 3;
-  // The name of the notification being requested.
-  string name = 4;
-}
-
-message GetNotificationResponse {
-  message Notification {
-    // The name of the requested notification.
-    string name = 1;
-    // The time at which the notification was created.
-    string created = 2;
-    // The time at which the notification was last sent out.
-    string notified = 3;
-    // The time at which a notification has been deleted.
-    string deleted = 4;
-    // The previous vulnerability and a paginated view of the ancestries it affects.
-    PagedVulnerableAncestries old = 5;
-    // The newly updated vulnerability and a paginated view of the ancestries it affects.
-    PagedVulnerableAncestries new = 6;
-  }
-  // The notification as requested.
-  Notification notification = 1;
-}
-
-message PagedVulnerableAncestries {
-  message IndexedAncestryName {
-    // The index is an ever increasing number associated with the particular ancestry.
-    // This is useful if you're processing notifications, and need to keep track of the progress of paginating the results.
-    int32 index = 1;
-    // The name of the ancestry.
-    string name = 2;
-  }
-  // The identifier for the current page.
-  string current_page = 1;
-  // The token used to request the next page.
-  // This will be empty when there are no more pages.
-  string next_page = 2;
-  // The requested maximum number of results per page.
-  int32 limit = 3;
-  // The vulnerability that affects a given set of ancestries.
-  Vulnerability vulnerability = 4;
-  // The ancestries affected by a vulnerability.
-  repeated IndexedAncestryName ancestries = 5;
-}
-
-message MarkNotificationAsReadRequest {
-  // The name of the Notification that has been processed.
-  string name = 1;
-}
-
-message MarkNotificationAsReadResponse {}
-
-message GetStatusRequest {}
-
-message GetStatusResponse {
-  // The status of the current Clair instance.
-  ClairStatus status = 1;
-}
--- a/api/v3/clairpb/clair.swagger.json
+++ b/api/v3/clairpb/clair.swagger.json
@ -1,7 +1,7 @@
 {
  "swagger": "2.0",
  "info": {
-    "title": "api/v3/clairpb/clair.proto",
+    "title": "clair.proto",
    "version": "version not set"
  },
  "schemes": [
@ -17,13 +17,12 @@
  "paths": {
    "/ancestry": {
      "post": {
-        "summary": "The RPC used to create a new scan of an ancestry.",
        "operationId": "PostAncestry",
        "responses": {
          "200": {
            "description": "",
            "schema": {
-              "$ref": "#/definitions/clairPostAncestryResponse"
+              "$ref": "#/definitions/clairpbPostAncestryResponse"
            }
          }
        },
@ -33,7 +32,7 @@
            "in": "body",
            "required": true,
            "schema": {
-              "$ref": "#/definitions/clairPostAncestryRequest"
+              "$ref": "#/definitions/clairpbPostAncestryRequest"
            }
          }
        ],
@ -44,13 +43,12 @@
    },
    "/ancestry/{ancestry_name}": {
      "get": {
-        "summary": "The RPC used to read the results of scanning for a particular ancestry.",
        "operationId": "GetAncestry",
        "responses": {
          "200": {
            "description": "",
            "schema": {
-              "$ref": "#/definitions/clairGetAncestryResponse"
+              "$ref": "#/definitions/clairpbGetAncestryResponse"
            }
          }
        },
@ -60,6 +58,20 @@
            "in": "path",
            "required": true,
            "type": "string"
+          },
+          {
+            "name": "with_vulnerabilities",
+            "in": "query",
+            "required": false,
+            "type": "boolean",
+            "format": "boolean"
+          },
+          {
+            "name": "with_features",
+            "in": "query",
+            "required": false,
+            "type": "boolean",
+            "format": "boolean"
          }
        ],
        "tags": [
@ -69,13 +81,12 @@
    },
    "/notifications/{name}": {
      "get": {
-        "summary": "The RPC used to get a particularly Notification.",
        "operationId": "GetNotification",
        "responses": {
          "200": {
            "description": "",
            "schema": {
-              "$ref": "#/definitions/clairGetNotificationResponse"
+              "$ref": "#/definitions/clairpbGetNotificationResponse"
            }
          }
        },
@ -88,21 +99,19 @@
          },
          {
            "name": "old_vulnerability_page",
-            "description": "The current page of previous vulnerabilities for the ancestry.\nThis will be empty when it is the first page.",
+            "description": "if the vulnerability_page is empty, it implies the first page.",
            "in": "query",
            "required": false,
            "type": "string"
          },
          {
            "name": "new_vulnerability_page",
-            "description": "The current page of vulnerabilities for the ancestry.\nThis will be empty when it is the first page.",
            "in": "query",
            "required": false,
            "type": "string"
          },
          {
            "name": "limit",
-            "description": "The requested maximum number of results per page.",
            "in": "query",
            "required": false,
            "type": "integer",
@ -114,13 +123,12 @@
        ]
      },
      "delete": {
-        "summary": "The RPC used to mark a Notification as read after it has been processed.",
        "operationId": "MarkNotificationAsRead",
        "responses": {
          "200": {
            "description": "",
            "schema": {
-              "$ref": "#/definitions/clairMarkNotificationAsReadResponse"
+              "$ref": "#/definitions/protobufEmpty"
            }
          }
        },
@ -136,360 +144,255 @@
          "NotificationService"
        ]
      }
-    },
-    "/status": {
-      "get": {
-        "summary": "The RPC used to show the internal state of current Clair instance.",
-        "operationId": "GetStatus",
-        "responses": {
-          "200": {
-            "description": "",
-            "schema": {
-              "$ref": "#/definitions/clairGetStatusResponse"
-            }
-          }
-        },
-        "tags": [
-          "StatusService"
-        ]
-      }
    }
  },
  "definitions": {
-    "DetectorDType": {
-      "type": "string",
-      "enum": [
-        "DETECTOR_D_TYPE_INVALID",
-        "DETECTOR_D_TYPE_NAMESPACE",
-        "DETECTOR_D_TYPE_FEATURE"
-      ],
-      "default": "DETECTOR_D_TYPE_INVALID"
-    },
-    "GetAncestryResponseAncestry": {
-      "type": "object",
-      "properties": {
-        "name": {
-          "type": "string",
-          "description": "The name of the desired ancestry."
-        },
-        "detectors": {
-          "type": "array",
-          "items": {
-            "$ref": "#/definitions/clairDetector"
-          },
-          "description": "The detectors used to scan this Ancestry. It may not be the current set\nof detectors in clair status."
-        },
-        "layers": {
-          "type": "array",
-          "items": {
-            "$ref": "#/definitions/GetAncestryResponseAncestryLayer"
-          },
-          "description": "The list of layers along with detected features in each."
-        }
-      }
-    },
-    "GetAncestryResponseAncestryLayer": {
-      "type": "object",
-      "properties": {
-        "layer": {
-          "$ref": "#/definitions/clairLayer",
-          "description": "The layer's information."
-        },
-        "detected_features": {
-          "type": "array",
-          "items": {
-            "$ref": "#/definitions/clairFeature"
-          },
-          "description": "The features detected in this layer."
-        }
-      }
-    },
-    "GetNotificationResponseNotification": {
-      "type": "object",
-      "properties": {
-        "name": {
-          "type": "string",
-          "description": "The name of the requested notification."
-        },
-        "created": {
-          "type": "string",
-          "description": "The time at which the notification was created."
-        },
-        "notified": {
-          "type": "string",
-          "description": "The time at which the notification was last sent out."
-        },
-        "deleted": {
-          "type": "string",
-          "description": "The time at which a notification has been deleted."
-        },
-        "old": {
-          "$ref": "#/definitions/clairPagedVulnerableAncestries",
-          "description": "The previous vulnerability and a paginated view of the ancestries it affects."
-        },
-        "new": {
-          "$ref": "#/definitions/clairPagedVulnerableAncestries",
-          "description": "The newly updated vulnerability and a paginated view of the ancestries it affects."
-        }
-      }
-    },
-    "PagedVulnerableAncestriesIndexedAncestryName": {
-      "type": "object",
-      "properties": {
-        "index": {
-          "type": "integer",
-          "format": "int32",
-          "description": "The index is an ever increasing number associated with the particular ancestry.\nThis is useful if you're processing notifications, and need to keep track of the progress of paginating the results."
-        },
-        "name": {
-          "type": "string",
-          "description": "The name of the ancestry."
-        }
-      }
-    },
    "PostAncestryRequestPostLayer": {
      "type": "object",
      "properties": {
        "hash": {
-          "type": "string",
-          "description": "The hash of the layer."
+          "type": "string"
        },
        "path": {
-          "type": "string",
-          "description": "The location of the layer (URL or filepath)."
+          "type": "string"
        },
        "headers": {
          "type": "object",
          "additionalProperties": {
            "type": "string"
-          },
-          "description": "Any HTTP Headers that need to be used if requesting a layer over HTTP(S)."
+          }
        }
      }
    },
-    "clairClairStatus": {
+    "clairpbAncestry": {
      "type": "object",
      "properties": {
+        "name": {
+          "type": "string"
+        },
+        "features": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/clairpbFeature"
+          }
+        },
+        "layers": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/clairpbLayer"
+          }
+        },
+        "scanned_listers": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "description": "scanned_listers and scanned_detectors are used to scan this ancestry, it\nmay be different from listers and detectors in ClairStatus since the\nancestry could be scanned by previous version of Clair."
+        },
+        "scanned_detectors": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        }
+      }
+    },
+    "clairpbClairStatus": {
+      "type": "object",
+      "properties": {
+        "listers": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "title": "listers and detectors are processors implemented in this Clair and used to\nscan ancestries"
+        },
        "detectors": {
          "type": "array",
          "items": {
-            "$ref": "#/definitions/clairDetector"
-          },
-          "title": "The implemented detectors in this Clair instance"
+            "type": "string"
+          }
        },
        "last_update_time": {
          "type": "string",
-          "format": "date-time",
-          "description": "The time at which the updater last ran."
+          "format": "date-time"
        }
      }
    },
-    "clairDetector": {
+    "clairpbFeature": {
      "type": "object",
      "properties": {
        "name": {
-          "type": "string",
-          "description": "The name of the detector."
+          "type": "string"
+        },
+        "namespace_name": {
+          "type": "string"
        },
        "version": {
-          "type": "string",
-          "description": "The version of the detector."
-        },
-        "dtype": {
-          "$ref": "#/definitions/DetectorDType",
-          "description": "The type of the detector."
-        }
-      }
-    },
-    "clairFeature": {
-      "type": "object",
-      "properties": {
-        "name": {
-          "type": "string",
-          "description": "The name of the feature."
-        },
-        "namespace": {
-          "$ref": "#/definitions/clairNamespace",
-          "description": "The namespace in which the feature is detected."
-        },
-        "version": {
-          "type": "string",
-          "description": "The specific version of this feature."
+          "type": "string"
        },
        "version_format": {
-          "type": "string",
-          "description": "The format used to parse version numbers for the feature."
-        },
-        "detector": {
-          "$ref": "#/definitions/clairDetector",
-          "description": "The detector used to detect this feature. This only exists when present in\nan Ancestry."
+          "type": "string"
        },
        "vulnerabilities": {
          "type": "array",
          "items": {
-            "$ref": "#/definitions/clairVulnerability"
-          },
-          "description": "The list of vulnerabilities that affect the feature."
-        },
-        "feature_type": {
-          "type": "string",
-          "description": "The feature type indicates if the feature represents a source package or\nbinary package."
+            "$ref": "#/definitions/clairpbVulnerability"
+          }
        }
      }
    },
-    "clairGetAncestryResponse": {
+    "clairpbGetAncestryResponse": {
      "type": "object",
      "properties": {
        "ancestry": {
-          "$ref": "#/definitions/GetAncestryResponseAncestry",
-          "description": "The ancestry requested."
+          "$ref": "#/definitions/clairpbAncestry"
        },
        "status": {
-          "$ref": "#/definitions/clairClairStatus",
-          "description": "The status of Clair at the time of the request."
+          "$ref": "#/definitions/clairpbClairStatus"
        }
      }
    },
-    "clairGetNotificationResponse": {
+    "clairpbGetNotificationResponse": {
      "type": "object",
      "properties": {
        "notification": {
-          "$ref": "#/definitions/GetNotificationResponseNotification",
-          "description": "The notification as requested."
+          "$ref": "#/definitions/clairpbNotification"
        }
      }
    },
-    "clairGetStatusResponse": {
+    "clairpbIndexedAncestryName": {
      "type": "object",
      "properties": {
-        "status": {
-          "$ref": "#/definitions/clairClairStatus",
-          "description": "The status of the current Clair instance."
+        "index": {
+          "type": "integer",
+          "format": "int32",
+          "description": "index is unique to name in all streams simultaneously streamed, increasing\nand larger than all indexes in previous page in same stream."
+        },
+        "name": {
+          "type": "string"
        }
      }
    },
-    "clairLayer": {
+    "clairpbLayer": {
      "type": "object",
      "properties": {
        "hash": {
-          "type": "string",
-          "description": "The sha256 tarsum for the layer."
+          "type": "string"
        }
      }
    },
-    "clairMarkNotificationAsReadResponse": {
-      "type": "object"
-    },
-    "clairNamespace": {
+    "clairpbNotification": {
      "type": "object",
      "properties": {
        "name": {
-          "type": "string",
-          "description": "The name of the namespace."
+          "type": "string"
        },
-        "detector": {
-          "$ref": "#/definitions/clairDetector",
-          "description": "The detector used to detect the namespace. This only exists when present in\nan Ancestry Feature."
+        "created": {
+          "type": "string"
+        },
+        "notified": {
+          "type": "string"
+        },
+        "deleted": {
+          "type": "string"
+        },
+        "old": {
+          "$ref": "#/definitions/clairpbPagedVulnerableAncestries"
+        },
+        "new": {
+          "$ref": "#/definitions/clairpbPagedVulnerableAncestries"
        }
      }
    },
-    "clairPagedVulnerableAncestries": {
+    "clairpbPagedVulnerableAncestries": {
      "type": "object",
      "properties": {
        "current_page": {
-          "type": "string",
-          "description": "The identifier for the current page."
+          "type": "string"
        },
        "next_page": {
          "type": "string",
-          "description": "The token used to request the next page.\nThis will be empty when there are no more pages."
+          "description": "if next_page is empty, it signals the end of all pages."
        },
        "limit": {
          "type": "integer",
-          "format": "int32",
-          "description": "The requested maximum number of results per page."
+          "format": "int32"
        },
        "vulnerability": {
-          "$ref": "#/definitions/clairVulnerability",
-          "description": "The vulnerability that affects a given set of ancestries."
+          "$ref": "#/definitions/clairpbVulnerability"
        },
        "ancestries": {
          "type": "array",
          "items": {
-            "$ref": "#/definitions/PagedVulnerableAncestriesIndexedAncestryName"
-          },
-          "description": "The ancestries affected by a vulnerability."
+            "$ref": "#/definitions/clairpbIndexedAncestryName"
+          }
        }
      }
    },
-    "clairPostAncestryRequest": {
+    "clairpbPostAncestryRequest": {
      "type": "object",
      "properties": {
        "ancestry_name": {
-          "type": "string",
-          "description": "The name of the ancestry being scanned.\nIf scanning OCI images, this should be the hash of the manifest."
+          "type": "string"
        },
        "format": {
-          "type": "string",
-          "description": "The format of the image being uploaded."
+          "type": "string"
        },
        "layers": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/PostAncestryRequestPostLayer"
-          },
-          "description": "The layers to be scanned for this Ancestry, ordered in the way that i th\nlayer is the parent of i + 1 th layer."
+          }
        }
      }
    },
-    "clairPostAncestryResponse": {
+    "clairpbPostAncestryResponse": {
      "type": "object",
      "properties": {
        "status": {
-          "$ref": "#/definitions/clairClairStatus",
-          "description": "The status of Clair at the time of the request."
+          "$ref": "#/definitions/clairpbClairStatus"
        }
      }
    },
-    "clairVulnerability": {
+    "clairpbVulnerability": {
      "type": "object",
      "properties": {
        "name": {
-          "type": "string",
-          "description": "The name of the vulnerability."
+          "type": "string"
        },
        "namespace_name": {
-          "type": "string",
-          "description": "The name of the namespace in which the vulnerability was detected."
+          "type": "string"
        },
        "description": {
-          "type": "string",
-          "description": "A description of the vulnerability according to the source for the namespace."
+          "type": "string"
        },
        "link": {
-          "type": "string",
-          "description": "A link to the vulnerability according to the source for the namespace."
+          "type": "string"
        },
        "severity": {
-          "type": "string",
-          "description": "How dangerous the vulnerability is."
+          "type": "string"
        },
        "metadata": {
-          "type": "string",
-          "description": "Namespace agnostic metadata about the vulnerability."
+          "type": "string"
        },
        "fixed_by": {
          "type": "string",
-          "description": "The feature that fixes this vulnerability.\nThis field only exists when a vulnerability is a part of a Feature."
+          "description": "fixed_by exists when vulnerability is under feature."
        },
        "affected_versions": {
          "type": "array",
          "items": {
-            "$ref": "#/definitions/clairFeature"
+            "$ref": "#/definitions/clairpbFeature"
          },
-          "description": "The Features that are affected by the vulnerability.\nThis field only exists when a vulnerability is a part of a Notification."
+          "description": "affected_versions exists when vulnerability is under notification."
        }
      }
+    },
+    "protobufEmpty": {
+      "type": "object",
+      "description": "service Foo {\n      rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);\n    }\n\nThe JSON representation for `Empty` is empty JSON object `{}`.",
+      "title": "A generic empty message that you can re-use to avoid defining duplicated\nempty messages in your APIs. A typical example is to use it as the request\nor the response type of an API method. For instance:"
    }
  }
 }
--- a/api/v3/clairpb/convert.go
+++ b/api/v3/clairpb/convert.go
@ -22,13 +22,6 @@ import (
 	"github.com/coreos/clair/ext/versionfmt"
 )

-// DatabaseDetectorTypeMapping maps the database detector type to the integer
-// enum proto.
-var DatabaseDetectorTypeMapping = map[database.DetectorType]Detector_DType{
-	database.NamespaceDetectorType: Detector_DType(1),
-	database.FeatureDetectorType:   Detector_DType(2),
-}
-
 // PagedVulnerableAncestriesFromDatabaseModel converts database
 // PagedVulnerableAncestries to api PagedVulnerableAncestries and assigns
 // indexes to ancestries.
@ -55,7 +48,7 @@ func PagedVulnerableAncestriesFromDatabaseModel(dbVuln *database.PagedVulnerable
 	}

 	for index, ancestryName := range dbVuln.Affected {
-		indexedAncestry := PagedVulnerableAncestries_IndexedAncestryName{
+		indexedAncestry := IndexedAncestryName{
 			Name:  ancestryName,
 			Index: int32(index),
 		}
@ -67,9 +60,9 @@ func PagedVulnerableAncestriesFromDatabaseModel(dbVuln *database.PagedVulnerable

 // NotificationFromDatabaseModel converts database notification, old and new
 // vulnerabilities' paged vulnerable ancestries to be api notification.
-func NotificationFromDatabaseModel(dbNotification database.VulnerabilityNotificationWithVulnerable) (*GetNotificationResponse_Notification, error) {
+func NotificationFromDatabaseModel(dbNotification database.VulnerabilityNotificationWithVulnerable) (*Notification, error) {
 	var (
-		noti GetNotificationResponse_Notification
+		noti Notification
 		err  error
 	)

@ -99,7 +92,6 @@ func NotificationFromDatabaseModel(dbNotification database.VulnerabilityNotifica
 	return &noti, nil
 }

-// VulnerabilityFromDatabaseModel converts database Vulnerability to api Vulnerability.
 func VulnerabilityFromDatabaseModel(dbVuln database.Vulnerability) (*Vulnerability, error) {
 	metaString := ""
 	if dbVuln.Metadata != nil {
@ -120,7 +112,6 @@ func VulnerabilityFromDatabaseModel(dbVuln database.Vulnerability) (*Vulnerabili
 	}, nil
 }

-// VulnerabilityWithFixedInFromDatabaseModel converts database VulnerabilityWithFixedIn to api Vulnerability.
 func VulnerabilityWithFixedInFromDatabaseModel(dbVuln database.VulnerabilityWithFixedIn) (*Vulnerability, error) {
 	vuln, err := VulnerabilityFromDatabaseModel(dbVuln.Vulnerability)
 	if err != nil {
@ -131,8 +122,25 @@ func VulnerabilityWithFixedInFromDatabaseModel(dbVuln database.VulnerabilityWith
 	return vuln, nil
 }

+// AncestryFromDatabaseModel converts database ancestry to api ancestry.
+func AncestryFromDatabaseModel(dbAncestry database.Ancestry) *Ancestry {
+	ancestry := &Ancestry{
+		Name: dbAncestry.Name,
+	}
+	for _, layer := range dbAncestry.Layers {
+		ancestry.Layers = append(ancestry.Layers, LayerFromDatabaseModel(layer))
+	}
+	return ancestry
+}
+
+// LayerFromDatabaseModel converts database layer to api layer.
+func LayerFromDatabaseModel(dbLayer database.Layer) *Layer {
+	layer := Layer{Hash: dbLayer.Hash}
+	return &layer
+}
+
 // NamespacedFeatureFromDatabaseModel converts database namespacedFeature to api Feature.
-func NamespacedFeatureFromDatabaseModel(feature database.AncestryFeature) *Feature {
+func NamespacedFeatureFromDatabaseModel(feature database.NamespacedFeature) *Feature {
 	version := feature.Feature.Version
 	if version == versionfmt.MaxVersion {
 		version = "None"
@ -140,35 +148,8 @@ func NamespacedFeatureFromDatabaseModel(feature database.AncestryFeature) *Featu

 	return &Feature{
 		Name:          feature.Feature.Name,
-		Namespace: &Namespace{
-			Name:     feature.Namespace.Name,
-			Detector: DetectorFromDatabaseModel(feature.NamespaceBy),
-		},
+		NamespaceName: feature.Namespace.Name,
 		VersionFormat: feature.Namespace.VersionFormat,
 		Version:       version,
-		Detector:      DetectorFromDatabaseModel(feature.FeatureBy),
-		FeatureType:   string(feature.Type),
 	}
 }
-
-// DetectorFromDatabaseModel converts database detector to api detector.
-func DetectorFromDatabaseModel(detector database.Detector) *Detector {
-	if !detector.Valid() {
-		return nil
-	}
-	return &Detector{
-		Name:    detector.Name,
-		Version: detector.Version,
-		Dtype:   DatabaseDetectorTypeMapping[detector.DType],
-	}
-}
-
-// DetectorsFromDatabaseModel converts database detectors to api detectors.
-func DetectorsFromDatabaseModel(dbDetectors []database.Detector) []*Detector {
-	detectors := make([]*Detector, 0, len(dbDetectors))
-	for _, d := range dbDetectors {
-		detectors = append(detectors, DetectorFromDatabaseModel(d))
-	}
-
-	return detectors
-}
--- a/api/v3/clairpb/generate-protobuf.sh
+++ b/api/v3/clairpb/generate-protobuf.sh
@ -1,28 +0,0 @@
-#!/usr/bin/env bash
-
-# Copyright 2018 clair authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set -o errexit
-set -o nounset
-set -o pipefail
-
-DOCKER_REPO_ROOT="$GOPATH/src/github.com/coreos/clair"
-IMAGE=${IMAGE:-"quay.io/coreos/clair-gen-proto"}
-
-docker run --rm -it \
-  -v "$DOCKER_REPO_ROOT":"$DOCKER_REPO_ROOT" \
-  -w "$DOCKER_REPO_ROOT" \
-  "$IMAGE" \
-  "./api/v3/clairpb/run_in_docker.sh"
--- a/api/v3/clairpb/prototool.yaml
+++ b/api/v3/clairpb/prototool.yaml
@ -1,3 +0,0 @@
-protoc_version: 3.5.1
-protoc_includes:
- ../../../vendor/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis
--- a/api/v3/clairpb/run_in_docker.sh
+++ b/api/v3/clairpb/run_in_docker.sh
@ -1,29 +0,0 @@
-#!/usr/bin/env bash
-
-# Copyright 2018 clair authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-set -o errexit
-set -o nounset
-set -o pipefail
-
-protoc -I/usr/include -I. \
-  -I"${GOPATH}/src" \
-  -I"${GOPATH}/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis" \
-  --go_out=plugins=grpc:. \
-  --grpc-gateway_out=logtostderr=true:. \
-  --swagger_out=logtostderr=true:. \
-  ./api/v3/clairpb/clair.proto
-
-go generate .
--- a/api/v3/rpc.go
+++ b/api/v3/rpc.go
@ -15,24 +15,20 @@
 package v3

 import (
-	"sync"
+	"fmt"

+	"github.com/golang/protobuf/ptypes"
+	google_protobuf1 "github.com/golang/protobuf/ptypes/empty"
 	"golang.org/x/net/context"
-	"golang.org/x/sync/errgroup"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"

 	"github.com/coreos/clair"
 	pb "github.com/coreos/clair/api/v3/clairpb"
 	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/ext/imagefmt"
-	"github.com/coreos/clair/pkg/pagination"
+	"github.com/coreos/clair/pkg/commonerr"
 )

-func newRPCErrorWithClairError(code codes.Code, err error) error {
-	return status.Errorf(code, "clair error reason: '%s'", err.Error())
-}
-
 // NotificationServer implements NotificationService interface for serving RPC.
 type NotificationServer struct {
 	Store database.Datastore
@ -43,56 +39,25 @@ type AncestryServer struct {
 	Store database.Datastore
 }

-// StatusServer implements StatusService interface for serving RPC.
-type StatusServer struct {
-	Store database.Datastore
-}
-
-// GetStatus implements getting the current status of Clair via the Clair service.
-func (s *StatusServer) GetStatus(ctx context.Context, req *pb.GetStatusRequest) (*pb.GetStatusResponse, error) {
-	clairStatus, err := GetClairStatus(s.Store)
-	if err != nil {
-		return nil, status.Error(codes.Internal, err.Error())
-	}
-
-	return &pb.GetStatusResponse{Status: clairStatus}, nil
-}
-
 // PostAncestry implements posting an ancestry via the Clair gRPC service.
 func (s *AncestryServer) PostAncestry(ctx context.Context, req *pb.PostAncestryRequest) (*pb.PostAncestryResponse, error) {
-	blobFormat := req.GetFormat()
-	if !imagefmt.IsSupported(blobFormat) {
-		return nil, status.Error(codes.InvalidArgument, "image blob format is not supported")
+	ancestryName := req.GetAncestryName()
+	if ancestryName == "" {
+		return nil, status.Error(codes.InvalidArgument, "ancestry name should not be empty")
 	}

-	clairStatus, err := GetClairStatus(s.Store)
-	if err != nil {
-		return nil, status.Error(codes.Internal, err.Error())
+	layers := req.GetLayers()
+	if len(layers) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "ancestry should have at least one layer")
 	}

-	// check if the ancestry is already processed; if not we build the ancestry again.
-	layerHashes := make([]string, len(req.Layers))
-	for i, layer := range req.Layers {
-		layerHashes[i] = layer.GetHash()
+	ancestryFormat := req.GetFormat()
+	if ancestryFormat == "" {
+		return nil, status.Error(codes.InvalidArgument, "ancestry format should not be empty")
 	}

-	found, err := clair.IsAncestryCached(s.Store, req.AncestryName, layerHashes)
-	if err != nil {
-		return nil, newRPCErrorWithClairError(codes.Internal, err)
-	}
-
-	if found {
-		return &pb.PostAncestryResponse{Status: clairStatus}, nil
-	}
-
-	builder := clair.NewAncestryBuilder(clair.EnabledDetectors())
-	layerMap := map[string]*database.Layer{}
-	layerMapLock := sync.RWMutex{}
-	g, analyzerCtx := errgroup.WithContext(ctx)
-	for i := range req.Layers {
-		layer := req.Layers[i]
-		if _, ok := layerMap[layer.Hash]; !ok {
-			layerMap[layer.Hash] = nil
+	ancestryLayers := []clair.LayerRequest{}
+	for _, layer := range layers {
 		if layer == nil {
 			err := status.Error(codes.InvalidArgument, "ancestry layer is invalid")
 			return nil, err
@ -106,73 +71,116 @@ func (s *AncestryServer) PostAncestry(ctx context.Context, req *pb.PostAncestryR
 			return nil, status.Error(codes.InvalidArgument, "ancestry layer path should not be empty")
 		}

-			g.Go(func() error {
-				clairLayer, err := clair.AnalyzeLayer(analyzerCtx, s.Store, layer.Hash, req.Format, layer.Path, layer.Headers)
-				if err != nil {
-					return err
-				}
-
-				layerMapLock.Lock()
-				layerMap[layer.Hash] = clairLayer
-				layerMapLock.Unlock()
-
-				return nil
+		ancestryLayers = append(ancestryLayers, clair.LayerRequest{
+			Hash:    layer.Hash,
+			Headers: layer.Headers,
+			Path:    layer.Path,
 		})
 	}
+
+	err := clair.ProcessAncestry(s.Store, ancestryFormat, ancestryName, ancestryLayers)
+	if err != nil {
+		return nil, status.Error(codes.Internal, "ancestry is failed to be processed: "+err.Error())
 	}

-	if err = g.Wait(); err != nil {
-		return nil, newRPCErrorWithClairError(codes.Internal, err)
-	}
-
-	for _, layer := range req.Layers {
-		builder.AddLeafLayer(layerMap[layer.Hash])
-	}
-
-	if err := clair.SaveAncestry(s.Store, builder.Ancestry(req.AncestryName)); err != nil {
-		return nil, newRPCErrorWithClairError(codes.Internal, err)
+	clairStatus, err := s.getClairStatus()
+	if err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
 	}

 	return &pb.PostAncestryResponse{Status: clairStatus}, nil
 }

-// GetAncestry implements retrieving an ancestry via the Clair gRPC service.
-func (s *AncestryServer) GetAncestry(ctx context.Context, req *pb.GetAncestryRequest) (*pb.GetAncestryResponse, error) {
-	name := req.GetAncestryName()
-	if name == "" {
-		return nil, status.Errorf(codes.InvalidArgument, "ancestry name should not be empty")
+func (s *AncestryServer) getClairStatus() (*pb.ClairStatus, error) {
+	status := &pb.ClairStatus{
+		Listers:   clair.Processors.Listers,
+		Detectors: clair.Processors.Detectors,
 	}

-	ancestry, ok, err := database.FindAncestryAndRollback(s.Store, name)
-	if err != nil {
-		return nil, newRPCErrorWithClairError(codes.Internal, err)
-	}
-
-	if !ok {
-		return nil, status.Errorf(codes.NotFound, "requested ancestry '%s' is not found", req.GetAncestryName())
-	}
-
-	pbAncestry := &pb.GetAncestryResponse_Ancestry{
-		Name:      ancestry.Name,
-		Detectors: pb.DetectorsFromDatabaseModel(ancestry.By),
-	}
-
-	for _, layer := range ancestry.Layers {
-		pbLayer, err := s.GetPbAncestryLayer(layer)
+	t, firstUpdate, err := clair.GetLastUpdateTime(s.Store)
 	if err != nil {
 		return nil, err
 	}
-
-		pbAncestry.Layers = append(pbAncestry.Layers, pbLayer)
+	if firstUpdate {
+		return status, nil
 	}

-	pbClairStatus, err := GetClairStatus(s.Store)
+	status.LastUpdateTime, err = ptypes.TimestampProto(t)
+	if err != nil {
+		return nil, err
+	}
+	return status, nil
+}
+
+// GetAncestry implements retrieving an ancestry via the Clair gRPC service.
+func (s *AncestryServer) GetAncestry(ctx context.Context, req *pb.GetAncestryRequest) (*pb.GetAncestryResponse, error) {
+	if req.GetAncestryName() == "" {
+		return nil, status.Errorf(codes.InvalidArgument, "ancestry name should not be empty")
+	}
+
+	tx, err := s.Store.Begin()
+	if err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+	defer tx.Rollback()
+
+	ancestry, _, ok, err := tx.FindAncestry(req.GetAncestryName())
+	if err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	} else if !ok {
+		return nil, status.Error(codes.NotFound, fmt.Sprintf("requested ancestry '%s' is not found", req.GetAncestryName()))
+	}
+
+	pbAncestry := pb.AncestryFromDatabaseModel(ancestry)
+	if req.GetWithFeatures() || req.GetWithVulnerabilities() {
+		ancestryWFeature, ok, err := tx.FindAncestryFeatures(ancestry.Name)
+		if err != nil {
+			return nil, status.Error(codes.Internal, err.Error())
+		}
+
+		if !ok {
+			return nil, status.Error(codes.NotFound, fmt.Sprintf("requested ancestry '%s' is not found", req.GetAncestryName()))
+		}
+		pbAncestry.ScannedDetectors = ancestryWFeature.ProcessedBy.Detectors
+		pbAncestry.ScannedListers = ancestryWFeature.ProcessedBy.Listers
+
+		if req.GetWithVulnerabilities() {
+			featureVulnerabilities, err := tx.FindAffectedNamespacedFeatures(ancestryWFeature.Features)
+			if err != nil {
+				return nil, status.Error(codes.Internal, err.Error())
+			}
+
+			for _, fv := range featureVulnerabilities {
+				// Ensure that every feature can be found.
+				if !fv.Valid {
+					return nil, status.Error(codes.Internal, "ancestry feature is not found")
+				}
+
+				pbFeature := pb.NamespacedFeatureFromDatabaseModel(fv.NamespacedFeature)
+				for _, v := range fv.AffectedBy {
+					pbVuln, err := pb.VulnerabilityWithFixedInFromDatabaseModel(v)
+					if err != nil {
+						return nil, status.Error(codes.Internal, err.Error())
+					}
+					pbFeature.Vulnerabilities = append(pbFeature.Vulnerabilities, pbVuln)
+				}
+
+				pbAncestry.Features = append(pbAncestry.Features, pbFeature)
+			}
+		} else {
+			for _, f := range ancestryWFeature.Features {
+				pbAncestry.Features = append(pbAncestry.Features, pb.NamespacedFeatureFromDatabaseModel(f))
+			}
+		}
+	}
+
+	clairStatus, err := s.getClairStatus()
 	if err != nil {
 		return nil, status.Error(codes.Internal, err.Error())
 	}

 	return &pb.GetAncestryResponse{
-		Status:   pbClairStatus,
+		Status:   clairStatus,
 		Ancestry: pbAncestry,
 	}, nil
 }
@ -188,20 +196,25 @@ func (s *NotificationServer) GetNotification(ctx context.Context, req *pb.GetNot
 		return nil, status.Error(codes.InvalidArgument, "notification page limit should not be empty or less than 1")
 	}

-	dbNotification, ok, err := database.FindVulnerabilityNotificationAndRollback(
-		s.Store,
+	tx, err := s.Store.Begin()
+	if err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+	defer tx.Rollback()
+
+	dbNotification, ok, err := tx.FindVulnerabilityNotification(
 		req.GetName(),
 		int(req.GetLimit()),
-		pagination.Token(req.GetOldVulnerabilityPage()),
-		pagination.Token(req.GetNewVulnerabilityPage()),
+		database.PageNumber(req.GetOldVulnerabilityPage()),
+		database.PageNumber(req.GetNewVulnerabilityPage()),
 	)

 	if err != nil {
-		return nil, newRPCErrorWithClairError(codes.Internal, err)
+		return nil, status.Error(codes.Internal, err.Error())
 	}

 	if !ok {
-		return nil, status.Errorf(codes.NotFound, "requested notification '%s' is not found", req.GetName())
+		return nil, status.Error(codes.NotFound, fmt.Sprintf("requested notification '%s' is not found", req.GetName()))
 	}

 	notification, err := pb.NotificationFromDatabaseModel(dbNotification)
@ -214,19 +227,27 @@ func (s *NotificationServer) GetNotification(ctx context.Context, req *pb.GetNot

 // MarkNotificationAsRead implements deleting a notification via the Clair gRPC
 // service.
-func (s *NotificationServer) MarkNotificationAsRead(ctx context.Context, req *pb.MarkNotificationAsReadRequest) (*pb.MarkNotificationAsReadResponse, error) {
+func (s *NotificationServer) MarkNotificationAsRead(ctx context.Context, req *pb.MarkNotificationAsReadRequest) (*google_protobuf1.Empty, error) {
 	if req.GetName() == "" {
 		return nil, status.Error(codes.InvalidArgument, "notification name should not be empty")
 	}

-	found, err := database.MarkNotificationAsReadAndCommit(s.Store, req.GetName())
+	tx, err := s.Store.Begin()
 	if err != nil {
-		return nil, newRPCErrorWithClairError(codes.Internal, err)
+		return nil, status.Error(codes.Internal, err.Error())
 	}

-	if !found {
-		return nil, status.Errorf(codes.NotFound, "requested notification '%s' is not found", req.GetName())
+	defer tx.Rollback()
+	err = tx.DeleteNotification(req.GetName())
+	if err == commonerr.ErrNotFound {
+		return nil, status.Error(codes.NotFound, "requested notification \""+req.GetName()+"\" is not found")
+	} else if err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
 	}

-	return &pb.MarkNotificationAsReadResponse{}, nil
+	if err := tx.Commit(); err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+
+	return &google_protobuf1.Empty{}, nil
 }
--- a/api/v3/server.go
+++ b/api/v3/server.go
@ -1,4 +1,4 @@
-// Copyright 2018 clair authors
+// Copyright 2017 clair authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@ -15,19 +15,35 @@
 package v3

 import (
+	"context"
+	"crypto/tls"
+	"net"
 	"net/http"
 	"strconv"
+	"strings"
 	"time"

+	"github.com/cockroachdb/cmux"
+	"github.com/grpc-ecosystem/go-grpc-prometheus"
+	"github.com/grpc-ecosystem/grpc-gateway/runtime"
 	"github.com/prometheus/client_golang/prometheus"
 	log "github.com/sirupsen/logrus"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"

 	pb "github.com/coreos/clair/api/v3/clairpb"
 	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/pkg/grpcutil"
 )

+// handleShutdown handles the server shut down error.
+func handleShutdown(err error) {
+	if err != nil {
+		if opErr, ok := err.(*net.OpError); !ok || (ok && opErr.Op != "accept") {
+			log.Fatal(err)
+		}
+	}
+}
+
 var (
 	promResponseDurationMilliseconds = prometheus.NewHistogramVec(prometheus.HistogramOpts{
 		Name:    "clair_v3_api_response_duration_milliseconds",
@ -40,66 +56,167 @@ func init() {
 	prometheus.MustRegister(promResponseDurationMilliseconds)
 }

-func prometheusHandler(h http.Handler) http.Handler {
-	mux := http.NewServeMux()
-	mux.Handle("/", h)
-	mux.Handle("/metrics", prometheus.Handler())
-	return mux
+func newGrpcServer(store database.Datastore, tlsConfig *tls.Config) *grpc.Server {
+	grpcOpts := []grpc.ServerOption{
+		grpc.UnaryInterceptor(grpc_prometheus.UnaryServerInterceptor),
+		grpc.StreamInterceptor(grpc_prometheus.StreamServerInterceptor),
+	}
+
+	if tlsConfig != nil {
+		grpcOpts = append(grpcOpts, grpc.Creds(credentials.NewTLS(tlsConfig)))
+	}
+
+	grpcServer := grpc.NewServer(grpcOpts...)
+	pb.RegisterAncestryServiceServer(grpcServer, &AncestryServer{Store: store})
+	pb.RegisterNotificationServiceServer(grpcServer, &NotificationServer{Store: store})
+	return grpcServer
 }

-type httpStatusWriter struct {
+type httpStatusWritter struct {
 	http.ResponseWriter

 	StatusCode int
 }

-func (w *httpStatusWriter) WriteHeader(code int) {
+func (w *httpStatusWritter) WriteHeader(code int) {
 	w.StatusCode = code
 	w.ResponseWriter.WriteHeader(code)
 }

-func loggingHandler(h http.Handler) http.Handler {
+// logHandler adds request logging to an http handler.
+func logHandler(handler http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		start := time.Now()
-		lrw := &httpStatusWriter{ResponseWriter: w, StatusCode: http.StatusOK}
+		lrw := &httpStatusWritter{ResponseWriter: w, StatusCode: http.StatusOK}

-		h.ServeHTTP(lrw, r)
+		handler.ServeHTTP(lrw, r)
+
+		statusStr := strconv.Itoa(lrw.StatusCode)
+		if lrw.StatusCode == 0 {
+			statusStr = "???"
+		}

 		log.WithFields(log.Fields{
 			"remote addr":       r.RemoteAddr,
 			"method":            r.Method,
 			"request uri":       r.RequestURI,
-			"status":            strconv.Itoa(lrw.StatusCode),
+			"status":            statusStr,
 			"elapsed time (ms)": float64(time.Since(start).Nanoseconds()) * 1e-6,
-		}).Info("handled HTTP request")
+		}).Info("Handled HTTP request")
 	})
 }

-// ListenAndServe serves the Clair v3 API over gRPC and the gRPC Gateway.
-func ListenAndServe(addr, certFile, keyFile, caPath string, store database.Datastore) error {
-	srv := grpcutil.MuxedGRPCServer{
-		Addr: addr,
-		ServicesFunc: func(gsrv *grpc.Server) {
-			pb.RegisterAncestryServiceServer(gsrv, &AncestryServer{Store: store})
-			pb.RegisterNotificationServiceServer(gsrv, &NotificationServer{Store: store})
-			pb.RegisterStatusServiceServer(gsrv, &StatusServer{Store: store})
-		},
-		ServiceHandlerFuncs: []grpcutil.RegisterServiceHandlerFunc{
-			pb.RegisterAncestryServiceHandler,
-			pb.RegisterNotificationServiceHandler,
-			pb.RegisterStatusServiceHandler,
-		},
-	}
+func newGrpcGatewayServer(ctx context.Context, listenerAddr string, tlsConfig *tls.Config) http.Handler {
+	var (
+		gwTLSConfig *tls.Config
+		gwOpts      []grpc.DialOption
+	)

-	middleware := func(h http.Handler) http.Handler {
-		return prometheusHandler(loggingHandler(h))
-	}
-
-	var err error
-	if caPath == "" {
-		err = srv.ListenAndServe(middleware)
+	if tlsConfig != nil {
+		gwTLSConfig = tlsConfig.Clone()
+		gwTLSConfig.InsecureSkipVerify = true
+		gwOpts = append(gwOpts, grpc.WithTransportCredentials(credentials.NewTLS(gwTLSConfig)))
 	} else {
-		err = srv.ListenAndServeTLS(certFile, keyFile, caPath, middleware)
+		gwOpts = append(gwOpts, grpc.WithInsecure())
 	}
-	return err
+
+	// changes json serializer to include empty fields with default values
+	jsonOpt := runtime.WithMarshalerOption(runtime.MIMEWildcard, &runtime.JSONPb{EmitDefaults: true})
+	gwmux := runtime.NewServeMux(jsonOpt)
+
+	conn, err := grpc.DialContext(ctx, listenerAddr, gwOpts...)
+	if err != nil {
+		log.WithError(err).Fatal("could not initialize grpc gateway connection")
+	}
+
+	err = pb.RegisterAncestryServiceHandler(ctx, gwmux, conn)
+	if err != nil {
+		log.WithError(err).Fatal("could not initialize ancestry grpc gateway")
+	}
+
+	err = pb.RegisterNotificationServiceHandler(ctx, gwmux, conn)
+	if err != nil {
+		log.WithError(err).Fatal("could not initialize notification grpc gateway")
+	}
+
+	return logHandler(gwmux)
+}
+
+func servePrometheus(mux *http.ServeMux) {
+	mux.Handle("/metrics", prometheus.Handler())
+}
+
+// Run initializes grpc and grpc gateway api services on the same address
+func Run(Addr string, tlsConfig *tls.Config, CertFile, KeyFile string, store database.Datastore) {
+	l, err := net.Listen("tcp", Addr)
+	if err != nil {
+		log.WithError(err).Fatalf("could not listen to address" + Addr)
+	}
+	log.WithField("addr", l.Addr().String()).Info("starting grpc server")
+
+	var (
+		apiHandler  http.Handler
+		apiListener net.Listener
+		srv         *http.Server
+		ctx         = context.Background()
+		httpMux     = http.NewServeMux()
+		tcpMux      = cmux.New(l)
+	)
+
+	if tlsConfig != nil {
+		cert, err := tls.LoadX509KeyPair(CertFile, KeyFile)
+		if err != nil {
+			log.WithError(err).Fatal("Failed to load certificate files")
+		}
+		tlsConfig.Certificates = []tls.Certificate{cert}
+		tlsConfig.NextProtos = []string{"h2"}
+
+		apiListener = tls.NewListener(tcpMux.Match(cmux.Any()), tlsConfig)
+		go func() { handleShutdown(tcpMux.Serve()) }()
+
+		grpcServer := newGrpcServer(store, tlsConfig)
+		gwmux := newGrpcGatewayServer(ctx, apiListener.Addr().String(), tlsConfig)
+
+		httpMux.Handle("/", gwmux)
+		servePrometheus(httpMux)
+		apiHandler = grpcHandlerFunc(grpcServer, httpMux)
+
+		log.Info("grpc server is configured with client certificate authentication")
+	} else {
+		grpcL := tcpMux.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
+		apiListener = tcpMux.Match(cmux.Any())
+		go func() { handleShutdown(tcpMux.Serve()) }()
+
+		grpcServer := newGrpcServer(store, nil)
+		go func() { handleShutdown(grpcServer.Serve(grpcL)) }()
+
+		gwmux := newGrpcGatewayServer(ctx, apiListener.Addr().String(), nil)
+
+		httpMux.Handle("/", gwmux)
+		servePrometheus(httpMux)
+		apiHandler = httpMux
+
+		log.Warn("grpc server is configured without client certificate authentication")
+	}
+
+	srv = &http.Server{
+		Handler:   apiHandler,
+		TLSConfig: tlsConfig,
+	}
+
+	// blocking call
+	handleShutdown(srv.Serve(apiListener))
+	log.Info("Grpc API stopped")
+}
+
+// grpcHandlerFunc returns an http.Handler that delegates to grpcServer on incoming gRPC
+// connections or otherHandler otherwise. Copied from cockroachdb.
+func grpcHandlerFunc(grpcServer *grpc.Server, otherHandler http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.ProtoMajor == 2 && strings.Contains(r.Header.Get("Content-Type"), "application/grpc") {
+			grpcServer.ServeHTTP(w, r)
+		} else {
+			otherHandler.ServeHTTP(w, r)
+		}
+	})
 }
--- a/api/v3/util.go
+++ b/api/v3/util.go
@ -1,92 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package v3
-
-import (
-	"github.com/coreos/clair"
-	pb "github.com/coreos/clair/api/v3/clairpb"
-	"github.com/coreos/clair/database"
-	"github.com/golang/protobuf/ptypes"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
-)
-
-// GetClairStatus retrieves the current status of Clair and wrap it inside
-// protobuf struct.
-func GetClairStatus(store database.Datastore) (*pb.ClairStatus, error) {
-	status := &pb.ClairStatus{
-		Detectors: pb.DetectorsFromDatabaseModel(clair.EnabledDetectors()),
-	}
-
-	t, firstUpdate, err := clair.GetLastUpdateTime(store)
-	if err != nil {
-		return nil, err
-	}
-	if firstUpdate {
-		return status, nil
-	}
-
-	status.LastUpdateTime, err = ptypes.TimestampProto(t)
-	if err != nil {
-		return nil, err
-	}
-	return status, nil
-}
-
-// GetPbAncestryLayer retrieves an ancestry layer with vulnerabilities and
-// features in an ancestry based on the provided database layer.
-func (s *AncestryServer) GetPbAncestryLayer(layer database.AncestryLayer) (*pb.GetAncestryResponse_AncestryLayer, error) {
-	pbLayer := &pb.GetAncestryResponse_AncestryLayer{
-		Layer: &pb.Layer{
-			Hash: layer.Hash,
-		},
-	}
-
-	features := layer.GetFeatures()
-	affectedFeatures, err := database.FindAffectedNamespacedFeaturesAndRollback(s.Store, features)
-	if err != nil {
-		return nil, newRPCErrorWithClairError(codes.Internal, err)
-	}
-
-	for _, feature := range affectedFeatures {
-		if !feature.Valid {
-			panic("feature is missing in the database, it indicates the database is corrupted.")
-		}
-
-		for _, detectedFeature := range layer.Features {
-			if detectedFeature.NamespacedFeature != feature.NamespacedFeature {
-				continue
-			}
-
-			var (
-				pbFeature = pb.NamespacedFeatureFromDatabaseModel(detectedFeature)
-				pbVuln    *pb.Vulnerability
-				err       error
-			)
-
-			for _, vuln := range feature.AffectedBy {
-				if pbVuln, err = pb.VulnerabilityWithFixedInFromDatabaseModel(vuln); err != nil {
-					return nil, status.Error(codes.Internal, err.Error())
-				}
-
-				pbFeature.Vulnerabilities = append(pbFeature.Vulnerabilities, pbVuln)
-			}
-
-			pbLayer.DetectedFeatures = append(pbLayer.DetectedFeatures, pbFeature)
-		}
-	}
-
-	return pbLayer, nil
-}
--- a/bill-of-materials.json
+++ b/bill-of-materials.json
@ -1,77 +1,132 @@
 [
 	{
-		"project": "github.com/coreos/clair",
-		"license": "Apache License 2.0",
-		"confidence": 1
+		"project": "github.com/beorn7/perks/quantile",
+		"licenses": [
+			{
+				"type": "MIT License",
+				"confidence": 0.9891304347826086
+			}
+		]
 	},
 	{
-		"project": "github.com/beorn7/perks/quantile",
-		"license": "MIT License",
-		"confidence": 0.989
+		"project": "github.com/coreos/clair",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
+				"confidence": 1
+			}
+		]
 	},
 	{
 		"project": "github.com/coreos/pkg/timeutil",
-		"license": "Apache License 2.0",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
 				"confidence": 1
+			}
+		]
 	},
 	{
 		"project": "github.com/golang/protobuf/proto",
-		"license": "BSD 3-clause \"New\" or \"Revised\" License",
-		"confidence": 0.92
-	},
+		"licenses": [
 			{
-		"project": "github.com/google/uuid",
-		"license": "BSD 3-clause \"New\" or \"Revised\" License",
-		"confidence": 0.966
+				"type": "BSD 3-clause \"New\" or \"Revised\" License",
+				"confidence": 0.92
+			}
+		]
 	},
 	{
 		"project": "github.com/matttproud/golang_protobuf_extensions/pbutil",
-		"license": "Apache License 2.0",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
 				"confidence": 1
+			}
+		]
 	},
 	{
 		"project": "github.com/pborman/uuid",
-		"license": "BSD 3-clause \"New\" or \"Revised\" License",
-		"confidence": 0.966
+		"licenses": [
+			{
+				"type": "BSD 3-clause \"New\" or \"Revised\" License",
+				"confidence": 0.9663865546218487
+			}
+		]
 	},
 	{
 		"project": "github.com/prometheus/client_golang/prometheus",
-		"license": "Apache License 2.0",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
 				"confidence": 1
+			}
+		]
 	},
 	{
 		"project": "github.com/prometheus/client_model/go",
-		"license": "Apache License 2.0",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
 				"confidence": 1
+			}
+		]
 	},
 	{
 		"project": "github.com/prometheus/common",
-		"license": "Apache License 2.0",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
 				"confidence": 1
+			}
+		]
 	},
 	{
-		"project": "github.com/prometheus/procfs/xfs",
-		"license": "Apache License 2.0",
+		"project": "github.com/prometheus/procfs",
+		"licenses": [
+			{
+				"type": "Apache License 2.0",
 				"confidence": 1
+			}
+		]
 	},
 	{
 		"project": "github.com/sirupsen/logrus",
-		"license": "MIT License",
+		"licenses": [
+			{
+				"type": "MIT License",
 				"confidence": 1
+			}
+		]
 	},
 	{
 		"project": "github.com/stretchr/testify/assert",
-		"license": "MIT License",
-		"confidence": 0.943
+		"licenses": [
+			{
+				"type": "MIT License",
+				"confidence": 0.9430051813471503
+			},
+			{
+				"type": "MIT License",
+				"confidence": 0.9430051813471503
+			}
+		]
 	},
 	{
 		"project": "github.com/stretchr/testify/vendor/github.com/davecgh/go-spew/spew",
-		"license": "ISC License",
-		"confidence": 0.985
+		"licenses": [
+			{
+				"type": "ISC License",
+				"confidence": 0.9850746268656716
+			}
+		]
 	},
 	{
 		"project": "github.com/stretchr/testify/vendor/github.com/pmezard/go-difflib/difflib",
-		"license": "BSD 3-clause \"New\" or \"Revised\" License",
-		"confidence": 0.983
+		"licenses": [
+			{
+				"type": "BSD 3-clause \"New\" or \"Revised\" License",
+				"confidence": 0.9830508474576272
+			}
+		]
 	}
 ]
--- a/blob.go
+++ b/blob.go
@ -1,43 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package clair
-
-import (
-	"context"
-	"io"
-	"net/http"
-	"os"
-	"strings"
-
-	"github.com/coreos/clair/pkg/httputil"
-)
-
-func retrieveLayerBlob(ctx context.Context, path string, headers map[string]string) (io.ReadCloser, error) {
-	if strings.HasPrefix(path, "http://") || strings.HasPrefix(path, "https://") {
-		httpHeaders := make(http.Header)
-		for key, value := range headers {
-			httpHeaders[key] = []string{value}
-		}
-
-		reader, err := httputil.GetWithContext(ctx, path, httpHeaders)
-		if err != nil {
-			return nil, err
-		}
-
-		return reader, nil
-	}
-
-	return os.Open(path)
-}
--- a/cmd/clair/config.go
+++ b/cmd/clair/config.go
@ -1,4 +1,4 @@
-// Copyright 2018 clair authors
+// Copyright 2017 clair authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@ -20,15 +20,17 @@ import (
 	"os"
 	"time"

+	"github.com/fernet/fernet-go"
 	log "github.com/sirupsen/logrus"
 	"gopkg.in/yaml.v2"

 	"github.com/coreos/clair"
 	"github.com/coreos/clair/api"
 	"github.com/coreos/clair/database"
+	"github.com/coreos/clair/ext/featurefmt"
+	"github.com/coreos/clair/ext/featurens"
 	"github.com/coreos/clair/ext/notification"
 	"github.com/coreos/clair/ext/vulnsrc"
-	"github.com/coreos/clair/pkg/pagination"
 )

 // ErrDatasourceNotLoaded is returned when the datasource variable in the
@ -45,6 +47,7 @@ type File struct {
 type Config struct {
 	Database database.RegistrableComponentConfig
 	Updater  *clair.UpdaterConfig
+	Worker   *clair.WorkerConfig
 	Notifier *notification.Config
 	API      *api.Config
 }
@ -59,6 +62,10 @@ func DefaultConfig() Config {
 			EnabledUpdaters: vulnsrc.ListUpdaters(),
 			Interval:        1 * time.Hour,
 		},
+		Worker: &clair.WorkerConfig{
+			EnabledDetectors: featurens.ListDetectors(),
+			EnabledListers:   featurefmt.ListListers(),
+		},
 		API: &api.Config{
 			HealthAddr: "0.0.0.0:6061",
 			Addr:       "0.0.0.0:6060",
@ -101,10 +108,15 @@ func LoadConfig(path string) (config *Config, err error) {
 	// Generate a pagination key if none is provided.
 	if v, ok := config.Database.Options["paginationkey"]; !ok || v == nil || v.(string) == "" {
 		log.Warn("pagination key is empty, generating...")
-		config.Database.Options["paginationkey"] = pagination.Must(pagination.NewKey()).String()
+		var key fernet.Key
+		if err = key.Generate(); err != nil {
+			return
+		}
+		config.Database.Options["paginationkey"] = key.Encode()
 	} else {
-		_, err = pagination.KeyFromString(config.Database.Options["paginationkey"].(string))
+		_, err = fernet.DecodeKey(config.Database.Options["paginationkey"].(string))
 		if err != nil {
+			err = errors.New("Invalid Pagination key; must be 32-bit URL-safe base64")
 			return
 		}
 	}
--- a/cmd/clair/main.go
+++ b/cmd/clair/main.go
@ -1,4 +1,4 @@
-// Copyright 2018 clair authors
+// Copyright 2017 clair authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@ -30,6 +30,9 @@ import (
 	"github.com/coreos/clair"
 	"github.com/coreos/clair/api"
 	"github.com/coreos/clair/database"
+	"github.com/coreos/clair/ext/featurefmt"
+	"github.com/coreos/clair/ext/featurens"
+	"github.com/coreos/clair/ext/imagefmt"
 	"github.com/coreos/clair/ext/vulnsrc"
 	"github.com/coreos/clair/pkg/formatter"
 	"github.com/coreos/clair/pkg/stopper"
@ -52,25 +55,13 @@ import (
 	_ "github.com/coreos/clair/ext/notification/webhook"
 	_ "github.com/coreos/clair/ext/vulnmdsrc/nvd"
 	_ "github.com/coreos/clair/ext/vulnsrc/alpine"
-	_ "github.com/coreos/clair/ext/vulnsrc/amzn"
 	_ "github.com/coreos/clair/ext/vulnsrc/debian"
 	_ "github.com/coreos/clair/ext/vulnsrc/oracle"
 	_ "github.com/coreos/clair/ext/vulnsrc/rhel"
-	_ "github.com/coreos/clair/ext/vulnsrc/suse"
 	_ "github.com/coreos/clair/ext/vulnsrc/ubuntu"
 )

-// MaxDBConnectionAttempts is the total number of tries that Clair will use to
-// initially connect to a database at start-up.
-const MaxDBConnectionAttempts = 20
-
-// BinaryDependencies are the programs that Clair expects to be on the $PATH
-// because it creates subprocesses of these programs.
-var BinaryDependencies = []string{
-	"git",
-	"rpm",
-	"xz",
-}
+const maxDBConnectionAttempts = 20

 func waitForSignals(signals ...os.Signal) {
 	interrupts := make(chan os.Signal, 1)
@ -101,12 +92,40 @@ func stopCPUProfiling(f *os.File) {
 }

 func configClairVersion(config *Config) {
-	clair.EnabledUpdaters = strutil.Intersect(config.Updater.EnabledUpdaters, vulnsrc.ListUpdaters())
+	listers := featurefmt.ListListers()
+	detectors := featurens.ListDetectors()
+	updaters := vulnsrc.ListUpdaters()

 	log.WithFields(log.Fields{
-		"Detectors": database.SerializeDetectors(clair.EnabledDetectors()),
-		"Updaters":  clair.EnabledUpdaters,
-	}).Info("enabled Clair extensions")
+		"Listers":   strings.Join(listers, ","),
+		"Detectors": strings.Join(detectors, ","),
+		"Updaters":  strings.Join(updaters, ","),
+	}).Info("Clair registered components")
+
+	unregDetectors := strutil.CompareStringLists(config.Worker.EnabledDetectors, detectors)
+	unregListers := strutil.CompareStringLists(config.Worker.EnabledListers, listers)
+	unregUpdaters := strutil.CompareStringLists(config.Updater.EnabledUpdaters, updaters)
+	if len(unregDetectors) != 0 || len(unregListers) != 0 || len(unregUpdaters) != 0 {
+		log.WithFields(log.Fields{
+			"Unknown Detectors":   strings.Join(unregDetectors, ","),
+			"Unknown Listers":     strings.Join(unregListers, ","),
+			"Unknown Updaters":    strings.Join(unregUpdaters, ","),
+			"Available Listers":   strings.Join(featurefmt.ListListers(), ","),
+			"Available Detectors": strings.Join(featurens.ListDetectors(), ","),
+			"Available Updaters":  strings.Join(vulnsrc.ListUpdaters(), ","),
+		}).Fatal("Unknown or unregistered components are configured")
+	}
+
+	// verify the user specified detectors/listers/updaters are implemented. If
+	// some are not registered, it logs warning and won't use the unregistered
+	// extensions.
+
+	clair.Processors = database.Processors{
+		Detectors: strutil.CompareStringListsInBoth(config.Worker.EnabledDetectors, detectors),
+		Listers:   strutil.CompareStringListsInBoth(config.Worker.EnabledListers, listers),
+	}
+
+	clair.EnabledUpdaters = strutil.CompareStringListsInBoth(config.Updater.EnabledUpdaters, updaters)
 }

 // Boot starts Clair instance with the provided config.
@ -117,7 +136,7 @@ func Boot(config *Config) {
 	// Open database
 	var db database.Datastore
 	var dbError error
-	for attempts := 1; attempts <= MaxDBConnectionAttempts; attempts++ {
+	for attempts := 1; attempts <= maxDBConnectionAttempts; attempts++ {
 		db, dbError = database.Open(config.Database)
 		if dbError == nil {
 			break
@ -131,8 +150,6 @@ func Boot(config *Config) {

 	defer db.Close()

-	clair.RegisterConfiguredDetectors(db)
-
 	// Start notifier
 	st.Begin()
 	go clair.RunNotifier(config.Notifier, db, st)
@ -153,35 +170,29 @@ func Boot(config *Config) {
 	st.Stop()
 }

-// Initialize logging system
-func configureLogger(flagLogLevel *string) {
-	logLevel, err := log.ParseLevel(strings.ToUpper(*flagLogLevel))
-	if err != nil {
-		log.WithError(err).Error("failed to set logger parser level")
-	}
-
-	log.SetLevel(logLevel)
-	log.SetOutput(os.Stdout)
-	log.SetFormatter(&formatter.JSONExtendedFormatter{ShowLn: true})
-}
-
 func main() {
 	// Parse command-line arguments
 	flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
 	flagConfigPath := flag.String("config", "/etc/clair/config.yaml", "Load configuration from the specified file.")
 	flagCPUProfilePath := flag.String("cpu-profile", "", "Write a CPU profile to the specified file before exiting.")
 	flagLogLevel := flag.String("log-level", "info", "Define the logging level.")
+	flagInsecureTLS := flag.Bool("insecure-tls", false, "Disable TLS server's certificate chain and hostname verification when pulling layers.")
 	flag.Parse()

-	configureLogger(flagLogLevel)
 	// Check for dependencies.
-	for _, bin := range BinaryDependencies {
+	for _, bin := range []string{"git", "bzr", "rpm", "xz"} {
 		_, err := exec.LookPath(bin)
 		if err != nil {
 			log.WithError(err).WithField("dependency", bin).Fatal("failed to find dependency")
 		}
 	}

+	// Initialize logging system
+	logLevel, err := log.ParseLevel(strings.ToUpper(*flagLogLevel))
+	log.SetLevel(logLevel)
+	log.SetOutput(os.Stdout)
+	log.SetFormatter(&formatter.JSONExtendedFormatter{ShowLn: true})
+
 	config, err := LoadConfig(*flagConfigPath)
 	if err != nil {
 		log.WithError(err).Fatal("failed to load configuration")
@ -192,6 +203,12 @@ func main() {
 		defer stopCPUProfiling(startCPUProfiling(*flagCPUProfilePath))
 	}

+	// Enable TLS server's certificate chain and hostname verification
+	// when pulling layers if specified
+	if *flagInsecureTLS {
+		imagefmt.SetInsecureTLS(*flagInsecureTLS)
+	}
+
 	// configure updater and worker
 	configClairVersion(config)

--- a/code-of-conduct.md
+++ b/code-of-conduct.md
@ -1,61 +0,0 @@
-## CoreOS Community Code of Conduct
-
-### Contributor Code of Conduct
-
-As contributors and maintainers of this project, and in the interest of
-fostering an open and welcoming community, we pledge to respect all people who
-contribute through reporting issues, posting feature requests, updating
-documentation, submitting pull requests or patches, and other activities.
-
-We are committed to making participation in this project a harassment-free
-experience for everyone, regardless of level of experience, gender, gender
-identity and expression, sexual orientation, disability, personal appearance,
-body size, race, ethnicity, age, religion, or nationality.
-
-Examples of unacceptable behavior by participants include:
-
-* The use of sexualized language or imagery
-* Personal attacks
-* Trolling or insulting/derogatory comments
-* Public or private harassment
-* Publishing others' private information, such as physical or electronic addresses, without explicit permission
-* Other unethical or unprofessional conduct.
-
-Project maintainers have the right and responsibility to remove, edit, or
-reject comments, commits, code, wiki edits, issues, and other contributions
-that are not aligned to this Code of Conduct. By adopting this Code of Conduct,
-project maintainers commit themselves to fairly and consistently applying these
-principles to every aspect of managing this project. Project maintainers who do
-not follow or enforce the Code of Conduct may be permanently removed from the
-project team.
-
-This code of conduct applies both within project spaces and in public spaces
-when an individual is representing the project or its community.
-
-Instances of abusive, harassing, or otherwise unacceptable behavior may be
-reported by contacting a project maintainer, Brandon Philips
-<brandon.philips@coreos.com>, and/or Rithu John <rithu.john@coreos.com>.
-
-This Code of Conduct is adapted from the Contributor Covenant
-(http://contributor-covenant.org), version 1.2.0, available at
-http://contributor-covenant.org/version/1/2/0/
-
-### CoreOS Events Code of Conduct
-
-CoreOS events are working conferences intended for professional networking and
-collaboration in the CoreOS community. Attendees are expected to behave
-according to professional standards and in accordance with their employer’s
-policies on appropriate workplace behavior.
-
-While at CoreOS events or related social networking opportunities, attendees
-should not engage in discriminatory or offensive speech or actions including
-but not limited to gender, sexuality, race, age, disability, or religion.
-Speakers should be especially aware of these concerns.
-
-CoreOS does not condone any statements by speakers contrary to these standards.
-CoreOS reserves the right to deny entrance and/or eject from an event (without
-refund) any individual found to be engaging in discriminatory or offensive
-speech or actions.
-
-Please bring any concerns to the immediate attention of designated on-site
-staff, Brandon Philips <brandon.philips@coreos.com>, and/or Rithu John <rithu.john@coreos.com>.
--- a/config.yaml.sample
+++ b/config.yaml.sample
@ -51,6 +51,19 @@ clair:
    keyfile:
    certfile:

+  worker:
+    namespace_detectors:
+      - os-release
+      - lsb-release
+      - apt-sources
+      - alpine-release
+      - redhat-release
+
+    feature_listers:
+      - apk
+      - dpkg
+      - rpm
+
  updater:
    # Frequency the database will be updated with vulnerabilities from the default data sources
    # The value 0 disables the updater entirely.
@ -61,7 +74,6 @@ clair:
      - rhel
      - oracle
      - alpine
-      - suse

  notifier:
    # Number of attempts before the notification is marked as failed to be sent
--- a/contrib/helm/clair/Chart.yaml
+++ b/contrib/helm/clair/Chart.yaml
@ -1,6 +1,6 @@
 name: clair
 home: https://coreos.com/clair
-version: 0.1.1
+version: 0.1.0
 appVersion: 3.0.0-pre
 description: Clair is an open source project for the static analysis of vulnerabilities in application containers.
 icon: https://cloud.githubusercontent.com/assets/343539/21630811/c5081e5c-d202-11e6-92eb-919d5999c77a.png
@ -8,4 +8,4 @@ sources:
  - https://github.com/coreos/clair
 maintainers:
  - name: Jimmy Zelinskie
-    email: jimmy.zelinskie@coreos.com
+  - email: jimmy.zelinskie@coreos.com
--- a/contrib/helm/clair/requirements.yaml
+++ b/contrib/helm/clair/requirements.yaml
@ -1,5 +1,5 @@
 dependencies:
  - name: postgresql
-    version: "1.0.0"
+    version: "*"
    condition: postgresql.enabled
    repository: "alias:stable"
--- a/contrib/helm/clair/templates/_config.yaml.tpl
+++ b/contrib/helm/clair/templates/_config.yaml.tpl
@ -1,83 +0,0 @@
-clair:
-  database:
-    # Database driver.
-    type: pgsql
-    options:
-      # PostgreSQL Connection string.
-      # https://www.postgresql.org/docs/current/static/libpq-connect.html#LIBPQ-CONNSTRING
-      {{- if .Values.config.postgresURI }}
-      source: "{{ .Values.config.postgresURI }}"
-      {{ else }}
-      source: "host={{ template "postgresql.fullname" . }} port=5432 user={{ .Values.postgresql.postgresUser }} password={{ .Values.postgresql.postgresPassword }} dbname={{ .Values.postgresql.postgresDatabase }} sslmode=disable statement_timeout=60000"
-      {{ end }}
-
-      # Number of elements kept in the cache.
-      # Values unlikely to change (e.g. namespaces) are cached in order to save prevent needless roundtrips to the database.
-      cachesize: 16384
-
-      # 32-bit URL-safe base64 key used to encrypt pagination tokens.
-      # If one is not provided, it will be generated.
-      # Multiple clair instances in the same cluster need the same value.
-      paginationkey: "{{ .Values.config.paginationKey }}"
-  api:
-    # v3 grpc/RESTful API server address.
-    addr: "0.0.0.0:{{ .Values.service.internalApiPort }}"
-
-    # Health server address.
-    # This is an unencrypted endpoint useful for load balancers to check to healthiness of the clair server.
-    healthaddr: "0.0.0.0:{{ .Values.service.internalHealthPort }}"
-
-    # Deadline before an API request will respond with a 503.
-    timeout: 900s
-
-    # Optional PKI configuration.
-    # If you want to easily generate client certificates and CAs, try the following projects:
-    # https://github.com/coreos/etcd-ca
-    # https://github.com/cloudflare/cfssl
-    servername:
-    cafile:
-    keyfile:
-    certfile:
-
-  worker:
-    namespace_detectors:
-    {{- range $key, $value := .Values.config.enabledNamespaceDetectors }}
-    - {{ $value }}
-    {{- end }}
-
-    feature_listers:
-    {{- range $key, $value := .Values.config.enabledFeatureListers }}
-    - {{ $value }}
-    {{- end }}
-
-  updater:
-    # Frequency the database will be updated with vulnerabilities from the default data sources.
-    # The value 0 disables the updater entirely.
-    interval: "{{ .Values.config.updateInterval }}"
-    enabledupdaters:
-    {{- range $key, $value := .Values.config.enabledUpdaters }}
-    - {{ $value }}
-    {{- end }}
-
-  notifier:
-    # Number of attempts before the notification is marked as failed to be sent.
-    attempts: 3
-
-    # Duration before a failed notification is retried.
-    renotifyinterval: 2h
-
-    http:
-      # Optional endpoint that will receive notifications via POST requests.
-      endpoint: "{{ .Values.config.notificationWebhookEndpoint }}"
-
-      # Optional PKI configuration.
-      # If you want to easily generate client certificates and CAs, try the following projects:
-      # https://github.com/cloudflare/cfssl
-      # https://github.com/coreos/etcd-ca
-      servername:
-      cafile:
-      keyfile:
-      certfile:
-
-      # Optional HTTP Proxy: must be a valid URL (including the scheme).
-      proxy:
--- a/contrib/helm/clair/templates/_helpers.tpl
+++ b/contrib/helm/clair/templates/_helpers.tpl
@ -2,29 +2,19 @@
 {{/*
 Expand the name of the chart.
 */}}
-{{- define "clair.name" -}}
+{{- define "name" -}}
 {{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
 {{- end -}}

 {{/*
 Create a default fully qualified app name.
 We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
-If release name contains chart name it will be used as a full name.
 */}}
-{{- define "clair.fullname" -}}
-{{- if .Values.fullnameOverride -}}
-{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
-{{- else -}}
+{{- define "fullname" -}}
 {{- $name := default .Chart.Name .Values.nameOverride -}}
-{{- if contains $name .Release.Name -}}
-{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
-{{- else -}}
 {{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
 {{- end -}}
-{{- end -}}
-{{- end -}}

-{{/*
 Create a default fully qualified postgresql name.
 We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
 */}}
--- a/contrib/helm/clair/templates/configmap.yaml
+++ b/contrib/helm/clair/templates/configmap.yaml
@ -0,0 +1,92 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ template "fullname" . }}
+  labels:
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+data:
+  config.yaml: |
+    clair:
+      database:
+        # Database driver
+        type: pgsql
+        options:
+          # PostgreSQL Connection string
+          # https://www.postgresql.org/docs/current/static/libpq-connect.html#LIBPQ-CONNSTRING
+          # This should be done using secrets or Vault, but for now this will also work
+          {{- if .Values.config.postgresURI -}}
+          source: "{{ .Values.config.postgresURI }}"
+          {{ else }}
+          source: "postgres://{{ .Values.postgresql.postgresUser }}:{{ .Values.postgresql.postgresPassword }}@{{ template "postgresql.fullname" . }}:5432/{{ .Values.postgresql.postgresDatabase }}?sslmode=disable"
+          {{ end }}
+
+          # Number of elements kept in the cache
+          # Values unlikely to change (e.g. namespaces) are cached in order to save prevent needless roundtrips to the database.
+          cachesize: 16384
+
+          # 32-bit URL-safe base64 key used to encrypt pagination tokens
+          # If one is not provided, it will be generated.
+          # Multiple clair instances in the same cluster need the same value.
+          paginationkey: "{{ .Values.config.paginationKey }}"
+      api:
+        # v3 grpc/RESTful API server address
+        addr: "0.0.0.0:6060"
+
+        # Health server address
+        # This is an unencrypted endpoint useful for load balancers to check to healthiness of the clair server.
+        healthaddr: "0.0.0.0:6061"
+
+        # Deadline before an API request will respond with a 503
+        timeout: 900s
+
+        # Optional PKI configuration
+        # If you want to easily generate client certificates and CAs, try the following projects:
+        # https://github.com/coreos/etcd-ca
+        # https://github.com/cloudflare/cfssl
+        servername:
+        cafile:
+        keyfile:
+        certfile:
+
+      worker:
+        namespace_detectors:
+        {{- range $key, $value := .Values.config.enabledNamespaceDetectors }}
+        - {{ $value }}
+        {{- end }}
+
+        feature_listers:
+        {{- range $key, $value := .Values.config.enabledFeatureListers }}
+        - {{ $value }}
+        {{- end }}
+
+      updater:
+        # Frequency the database will be updated with vulnerabilities from the default data sources
+        # The value 0 disables the updater entirely.
+        interval: "{{ .Values.config.updateInterval }}"
+        enabledupdaters:
+        {{- range $key, $value := .Values.config.enabledUpdaters }}
+        - {{ $value }}
+        {{- end }}
+
+      notifier:
+        # Number of attempts before the notification is marked as failed to be sent
+        attempts: 3
+
+        # Duration before a failed notification is retried
+        renotifyinterval: 2h
+
+        http:
+          # Optional endpoint that will receive notifications via POST requests
+          endpoint: "{{ .Values.config.notificationWebhookEndpoint }}"
+
+          # Optional PKI configuration
+          # If you want to easily generate client certificates and CAs, try the following projects:
+          # https://github.com/cloudflare/cfssl
+          # https://github.com/coreos/etcd-ca
+          servername:
+          cafile:
+          keyfile:
+          certfile:
+
+          # Optional HTTP Proxy: must be a valid URL (including the scheme).
+          proxy:
--- a/contrib/helm/clair/templates/deployment.yaml
+++ b/contrib/helm/clair/templates/deployment.yaml
@ -1,34 +1,23 @@
-apiVersion: apps/v1
+apiVersion: extensions/v1beta1
 kind: Deployment
 metadata:
-  name: {{ template "clair.fullname" . }}
+  name: {{ template "fullname" . }}
  labels:
-    heritage: {{ .Release.Service | quote }}
+    hertiage: {{ .Release.Service | quote }}
    release: {{ .Release.Name | quote }}
    chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
-    app: {{ template "clair.fullname" . }}
+    component: {{ .Release.Name }}
 spec:
  replicas: {{ .Values.replicaCount }}
-  selector:
-    matchLabels:
-      app: {{ template "clair.fullname" . }}
  template:
    metadata:
      labels:
-        app: {{ template "clair.fullname" . }}
+        app: {{ template "fullname" . }}
    spec:
      volumes:
      - name: "{{ .Chart.Name }}-config"
-        secret:
-          secretName: {{ template "clair.fullname" . }}
-      {{- if .Values.nodeSelector }}
-      nodeSelector:
-{{ toYaml .Values.nodeSelector | indent 8 }}
-      {{- end }}
-      {{- if .Values.tolerations }}
-      tolerations:
-{{ toYaml .Values.tolerations | indent 8 }}
-      {{- end }}
+        configMap:
+          name: {{ template "fullname" . }}
      containers:
      - name: {{ .Chart.Name }}
        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
@ -37,10 +26,10 @@ spec:
        - "-log-level={{ .Values.logLevel }}"
        {{ if .Values.insecureTls }}- "--insecure-tls" {{end}}
        ports:
-        - name: "{{ .Chart.Name }}-api"
+        - name: clair-api
          containerPort: {{ .Values.service.internalApiPort }}
          protocol: TCP
-        - name: "{{ .Chart.Name }}-health"
+        - name: clair-health
          containerPort: {{ .Values.service.internalHealthPort }}
          protocol: TCP
        livenessProbe:
@ -54,6 +43,5 @@ spec:
        volumeMounts:
        - name: "{{ .Chart.Name }}-config"
          mountPath: /etc/clair
-          readOnly: true
        resources:
 {{ toYaml .Values.resources | indent 10 }}
--- a/contrib/helm/clair/templates/ingress.yaml
+++ b/contrib/helm/clair/templates/ingress.yaml
@ -1,16 +1,15 @@
 {{- if .Values.ingress.enabled -}}
-{{- $serviceName := include "clair.fullname" . -}}
+{{- $serviceName := include "fullname" . -}}
 {{- $servicePort := .Values.service.externalApiPort -}}
-{{- $path := .Values.ingress.path | default "/" -}}
 apiVersion: extensions/v1beta1
 kind: Ingress
 metadata:
-  name: {{ template "clair.fullname" . }}
+  name: {{ template "fullname" . }}
  labels:
-    heritage: {{ .Release.Service | quote }}
-    release: {{ .Release.Name | quote }}
+    app: {{ template "fullname" . }}
    chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
-    app: {{ template "clair.fullname" . }}
+    release: "{{ .Release.Name }}"
+    heritage: "{{ .Release.Service }}"
  annotations:
    {{- range $key, $value := .Values.ingress.annotations }}
      {{ $key }}: {{ $value | quote }}
@ -21,7 +20,7 @@ spec:
    - host: {{ $host }}
      http:
        paths:
-          - path: {{ $path }}
+          - path: /
            backend:
              serviceName: {{ $serviceName }}
              servicePort: {{ $servicePort }}
--- a/contrib/helm/clair/templates/secret.yaml
+++ b/contrib/helm/clair/templates/secret.yaml
@ -1,13 +0,0 @@
-apiVersion: v1
-kind: Secret
-metadata:
-  name: {{ template "clair.fullname" . }}
-  labels:
-    heritage: {{ .Release.Service | quote }}
-    release: {{ .Release.Name | quote }}
-    chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
-    app: {{ template "clair.fullname" . }}
-type: Opaque
-data:
-  config.yaml: |-
-{{ include (print .Template.BasePath "/_config.yaml.tpl") . | b64enc | indent 4 }}
--- a/contrib/helm/clair/templates/service.yaml
+++ b/contrib/helm/clair/templates/service.yaml
@ -1,28 +1,21 @@
 apiVersion: v1
 kind: Service
 metadata:
-  name: {{ template "clair.fullname" . }}
+  name: {{ template "fullname" . }}
  labels:
-    heritage: {{ .Release.Service | quote }}
-    release: {{ .Release.Name | quote }}
    chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
-    app: {{ template "clair.fullname" . }}
 spec:
  type: {{ .Values.service.type }}
  ports:
-  - name: "{{ .Chart.Name }}-api"
+  - name: clair-api
    port: {{ .Values.service.externalApiPort }}
    targetPort: {{ .Values.service.internalApiPort }}
    protocol: TCP
-{{- if and (.Values.service.apiNodePort) (eq .Values.service.type "NodePort") }}
-    nodePort: {{ .Values.service.apiNodePort }}
-{{- end }}
-  - name: "{{ .Chart.Name }}-health"
+    name: "{{ .Values.service.name }}-api"
+  - name: clair-health
    port: {{ .Values.service.externalHealthPort }}
    targetPort: {{ .Values.service.internalHealthPort }}
    protocol: TCP
-{{- if and (.Values.service.healthNodePort) (eq .Values.service.type "NodePort") }}
-    nodePort: {{ .Values.service.healthNodePort }}
-{{- end }}
+    name: "{{ .Values.service.name }}-health"
  selector:
-    app: {{ template "clair.fullname" . }}
+    app: {{ template "fullname" . }}
--- a/contrib/helm/clair/values.yaml
+++ b/contrib/helm/clair/values.yaml
@ -9,6 +9,7 @@ image:
  tag: latest
  pullPolicy: Always
 service:
+  name: clair
  type: ClusterIP
  internalApiPort: 6060
  externalApiPort: 6060
@ -29,11 +30,11 @@ ingress:
    #     - chart-example.local
 resources:
  limits:
-    cpu: 200m
-    memory: 1500Mi
+    cpu: 100m
+    memory: 1Gi
  requests:
    cpu: 100m
-    memory: 500Mi
+    memory: 128Mi
 config:
  # postgresURI: "postgres://user:password@host:5432/postgres?sslmode=disable"
  paginationKey: "XxoPtCUzrUv4JV5dS+yQ+MdW7yLEJnRMwigVY/bpgtQ="
@ -55,18 +56,9 @@ config:
  - apk
  - dpkg
  - rpm
-nodeSelector: {}
-tolerations: []
-
 # Configuration values for the postgresql dependency.
 # ref: https://github.com/kubernetes/charts/blob/master/stable/postgresql/README.md
 postgresql:
-# The dependant Postgres chart can be disabled, to connect to
-# an existing database by defining config.postgresURI
-  enabled: true
-
-  imageTag: 9.6-alpine
-
  cpu: 1000m
  memory: 1Gi
 # These values are hardcoded until Helm supports secrets.
--- a/database/ancestry.go
+++ b/database/ancestry.go
@ -1,96 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-// Ancestry is a manifest that keeps all layers in an image in order.
-type Ancestry struct {
-	// Name is a globally unique value for a set of layers. This is often the
-	// sha256 digest of an OCI/Docker manifest.
-	Name string `json:"name"`
-	// By contains the processors that are used when computing the
-	// content of this ancestry.
-	By []Detector `json:"by"`
-	// Layers should be ordered and i_th layer is the parent of i+1_th layer in
-	// the slice.
-	Layers []AncestryLayer `json:"layers"`
-}
-
-// Valid checks if the ancestry is compliant to spec.
-func (a *Ancestry) Valid() bool {
-	if a == nil {
-		return false
-	}
-
-	if a.Name == "" {
-		return false
-	}
-
-	for _, d := range a.By {
-		if !d.Valid() {
-			return false
-		}
-	}
-
-	for _, l := range a.Layers {
-		if !l.Valid() {
-			return false
-		}
-	}
-
-	return true
-}
-
-// AncestryLayer is a layer with all detected namespaced features.
-type AncestryLayer struct {
-	// Hash is the sha-256 tarsum on the layer's blob content.
-	Hash string `json:"hash"`
-	// Features are the features introduced by this layer when it was
-	// processed.
-	Features []AncestryFeature `json:"features"`
-}
-
-// Valid checks if the Ancestry Layer is compliant to the spec.
-func (l *AncestryLayer) Valid() bool {
-	if l == nil {
-		return false
-	}
-
-	if l.Hash == "" {
-		return false
-	}
-
-	return true
-}
-
-// GetFeatures returns the Ancestry's features.
-func (l *AncestryLayer) GetFeatures() []NamespacedFeature {
-	nsf := make([]NamespacedFeature, 0, len(l.Features))
-	for _, f := range l.Features {
-		nsf = append(nsf, f.NamespacedFeature)
-	}
-
-	return nsf
-}
-
-// AncestryFeature is a namespaced feature with the detectors used to
-// find this feature.
-type AncestryFeature struct {
-	NamespacedFeature `json:"namespacedFeature"`
-
-	// FeatureBy is the detector that detected the feature.
-	FeatureBy Detector `json:"featureBy"`
-	// NamespaceBy is the detector that detected the namespace.
-	NamespaceBy Detector `json:"namespaceBy"`
-}
--- a/database/database.go
+++ b/database/database.go
@ -1,4 +1,4 @@
-// Copyright 2019 clair authors
+// Copyright 2017 clair authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@ -17,29 +17,20 @@
 package database

 import (
+	"errors"
 	"fmt"
 	"time"
-
-	"github.com/coreos/clair/pkg/pagination"
 )

 var (
 	// ErrBackendException is an error that occurs when the database backend
 	// does not work properly (ie. unreachable).
-	ErrBackendException = NewStorageError("an error occurred when querying the backend")
+	ErrBackendException = errors.New("database: an error occurred when querying the backend")

 	// ErrInconsistent is an error that occurs when a database consistency check
 	// fails (i.e. when an entity which is supposed to be unique is detected
 	// twice)
-	ErrInconsistent = NewStorageError("inconsistent database")
-
-	// ErrInvalidParameters is an error that occurs when the parameters are not valid.
-	ErrInvalidParameters = NewStorageError("parameters are not valid")
-
-	// ErrMissingEntities is an error that occurs when an associated immutable
-	// entity doesn't exist in the database. This error can indicate a wrong
-	// implementation or corrupted database.
-	ErrMissingEntities = NewStorageError("associated immutable entities are missing in the database")
+	ErrInconsistent = errors.New("database: inconsistent database")
 )

 // RegistrableComponentConfig is a configuration block that can be used to
@ -100,14 +91,18 @@ type Session interface {

 	// UpsertAncestry inserts or replaces an ancestry and its namespaced
 	// features and processors used to scan the ancestry.
-	UpsertAncestry(Ancestry) error
+	UpsertAncestry(ancestry Ancestry, features []NamespacedFeature, processedBy Processors) error

-	// FindAncestry retrieves an ancestry with all detected
-	// namespaced features. If the ancestry is not found, return false.
-	FindAncestry(name string) (ancestry Ancestry, found bool, err error)
+	// FindAncestry retrieves an ancestry with processors used to scan the
+	// ancestry. If the ancestry is not found, return false.
+	//
+	// The ancestry's processors are returned to short cut processing ancestry
+	// if it has been processed by all processors in the current Clair instance.
+	FindAncestry(name string) (ancestry Ancestry, processedBy Processors, found bool, err error)

-	// PersistDetector inserts a slice of detectors if not in the database.
-	PersistDetectors(detectors []Detector) error
+	// FindAncestryFeatures retrieves an ancestry with all detected namespaced
+	// features. If the ancestry is not found, return false.
+	FindAncestryFeatures(name string) (ancestry AncestryWithFeatures, found bool, err error)

 	// PersistFeatures inserts a set of features if not in the database.
 	PersistFeatures(features []Feature) error
@ -130,14 +125,22 @@ type Session interface {
 	// PersistNamespaces inserts a set of namespaces if not in the database.
 	PersistNamespaces([]Namespace) error

-	// PersistLayer appends a layer's content in the database.
-	//
-	// If any feature, namespace, or detector is not in the database, it returns not found error.
-	PersistLayer(hash string, features []LayerFeature, namespaces []LayerNamespace, detectedBy []Detector) error
+	// PersistLayer inserts a layer if not in the datastore.
+	PersistLayer(Layer) error

-	// FindLayer returns a layer with all detected features and
+	// PersistLayerContent persists a layer's content in the database. The given
+	// namespaces and features can be partial content of this layer.
+	//
+	// The layer, namespaces and features are expected to be already existing
+	// in the database.
+	PersistLayerContent(hash string, namespaces []Namespace, features []Feature, processedBy Processors) error
+
+	// FindLayer retrieves a layer and the processors scanned the layer.
+	FindLayer(hash string) (layer Layer, processedBy Processors, found bool, err error)
+
+	// FindLayerWithContent returns a layer with all detected features and
 	// namespaces.
-	FindLayer(hash string) (layer Layer, found bool, err error)
+	FindLayerWithContent(hash string) (layer LayerWithContent, found bool, err error)

 	// InsertVulnerabilities inserts a set of UNIQUE vulnerabilities with
 	// affected features into database, assuming that all vulnerabilities
@ -165,13 +168,20 @@ type Session interface {
 	// affected ancestries affected by old or new vulnerability.
 	//
 	// Because the number of affected ancestries maybe large, they are paginated
-	// and their pages are specified by the pagination token, which should be
-	// considered first page when it's empty.
-	FindVulnerabilityNotification(name string, limit int, oldVulnerabilityPage pagination.Token, newVulnerabilityPage pagination.Token) (noti VulnerabilityNotificationWithVulnerable, found bool, err error)
+	// and their pages are specified by the given encrypted PageNumbers, which,
+	// if empty, are always considered first page.
+	//
+	// Session interface implementation should have encrypt and decrypt
+	// functions for PageNumber.
+	FindVulnerabilityNotification(name string, limit int,
+		oldVulnerabilityPage PageNumber,
+		newVulnerabilityPage PageNumber) (
+		noti VulnerabilityNotificationWithVulnerable,
+		found bool, err error)

-	// MarkNotificationAsRead marks a Notification as notified now, assuming
+	// MarkNotificationNotified marks a Notification as notified now, assuming
 	// the requested notification is in the database.
-	MarkNotificationAsRead(name string) error
+	MarkNotificationNotified(name string) error

 	// DeleteNotification removes a Notification in the database.
 	DeleteNotification(name string) error
@ -182,22 +192,23 @@ type Session interface {
 	// FindKeyValue retrieves a value from the given key.
 	FindKeyValue(key string) (value string, found bool, err error)

-	// AcquireLock acquires a brand new lock in the database with a given name
-	// for the given duration.
+	// Lock creates or renew a Lock in the database with the given name, owner
+	// and duration.
 	//
-	// A lock can only have one owner.
-	// This method should NOT block until a lock is acquired.
-	AcquireLock(name, owner string, duration time.Duration) (acquired bool, expiration time.Time, err error)
+	// After the specified duration, the Lock expires by itself if it hasn't been
+	// unlocked, and thus, let other users create a Lock with the same name.
+	// However, the owner can renew its Lock by setting renew to true.
+	// Lock should not block, it should instead returns whether the Lock has been
+	// successfully acquired/renewed. If it's the case, the expiration time of
+	// that Lock is returned as well.
+	Lock(name string, owner string, duration time.Duration, renew bool) (success bool, expiration time.Time, err error)

-	// ExtendLock extends an existing lock such that the lock will expire at the
-	// current time plus the provided duration.
-	//
-	// This method should return immediately with an error if the lock does not
-	// exist.
-	ExtendLock(name, owner string, duration time.Duration) (extended bool, expiration time.Time, err error)
+	// Unlock releases an existing Lock.
+	Unlock(name, owner string) error

-	// ReleaseLock releases an existing lock.
-	ReleaseLock(name, owner string) error
+	// FindLock returns the owner of a Lock specified by the name, and its
+	// expiration time if it exists.
+	FindLock(name string) (owner string, expiration time.Time, found bool, err error)
 }

 // Datastore represents a persistent data store
--- a/database/dbutil.go
+++ b/database/dbutil.go
@ -1,539 +0,0 @@
-// Copyright 2018 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-import (
-	"encoding/json"
-	"time"
-
-	log "github.com/sirupsen/logrus"
-
-	"github.com/coreos/clair/pkg/commonerr"
-	"github.com/coreos/clair/pkg/pagination"
-	"github.com/deckarep/golang-set"
-)
-
-// DeduplicateNamespaces deduplicates a list of namespaces.
-func DeduplicateNamespaces(namespaces ...Namespace) []Namespace {
-	nsSet := mapset.NewSet()
-	for _, ns := range namespaces {
-		nsSet.Add(ns)
-	}
-
-	uniqueNamespaces := make([]Namespace, 0, nsSet.Cardinality())
-	for ns := range nsSet.Iter() {
-		uniqueNamespaces = append(uniqueNamespaces, ns.(Namespace))
-	}
-
-	return uniqueNamespaces
-}
-
-// DeduplicateFeatures deduplicates a list of list of features.
-func DeduplicateFeatures(features ...Feature) []Feature {
-	fSet := mapset.NewSet()
-	for _, f := range features {
-		fSet.Add(f)
-	}
-
-	return ConvertFeatureSetToFeatures(fSet)
-}
-
-// ConvertFeatureSetToFeatures converts a feature set to an array of features
-func ConvertFeatureSetToFeatures(features mapset.Set) []Feature {
-	uniqueFeatures := make([]Feature, 0, features.Cardinality())
-	for f := range features.Iter() {
-		uniqueFeatures = append(uniqueFeatures, f.(Feature))
-	}
-
-	return uniqueFeatures
-}
-
-func ConvertFeatureSetToLayerFeatures(features mapset.Set) []LayerFeature {
-	uniqueLayerFeatures := make([]LayerFeature, 0, features.Cardinality())
-	for f := range features.Iter() {
-		feature := f.(Feature)
-		layerFeature := LayerFeature{
-			Feature: feature,
-		}
-		uniqueLayerFeatures = append(uniqueLayerFeatures, layerFeature)
-	}
-
-	return uniqueLayerFeatures
-}
-
-// FindKeyValueAndRollback wraps session FindKeyValue function with begin and
-// roll back.
-func FindKeyValueAndRollback(datastore Datastore, key string) (value string, ok bool, err error) {
-	var tx Session
-	tx, err = datastore.Begin()
-	if err != nil {
-		return
-	}
-	defer tx.Rollback()
-
-	value, ok, err = tx.FindKeyValue(key)
-	return
-}
-
-// PersistPartialLayerAndCommit wraps session PersistLayer function with begin and
-// commit.
-func PersistPartialLayerAndCommit(datastore Datastore, layer *Layer) error {
-	tx, err := datastore.Begin()
-	if err != nil {
-		return err
-	}
-	defer tx.Rollback()
-
-	if err := tx.PersistLayer(layer.Hash, layer.Features, layer.Namespaces, layer.By); err != nil {
-		return err
-	}
-
-	return tx.Commit()
-}
-
-// PersistFeaturesAndCommit wraps session PersistFeaturesAndCommit function with begin and commit.
-func PersistFeaturesAndCommit(datastore Datastore, features []Feature) error {
-	tx, err := datastore.Begin()
-	if err != nil {
-		return err
-	}
-	defer tx.Rollback()
-
-	if err := tx.PersistFeatures(features); err != nil {
-		serialized, _ := json.Marshal(features)
-		log.WithError(err).WithField("feature", string(serialized)).Error("failed to store features")
-		return err
-	}
-
-	return tx.Commit()
-}
-
-// PersistNamespacesAndCommit wraps session PersistNamespaces function with
-// begin and commit.
-func PersistNamespacesAndCommit(datastore Datastore, namespaces []Namespace) error {
-	tx, err := datastore.Begin()
-	if err != nil {
-		return err
-	}
-	defer tx.Rollback()
-
-	if err := tx.PersistNamespaces(namespaces); err != nil {
-		return err
-	}
-
-	return tx.Commit()
-}
-
-// FindAncestryAndRollback wraps session FindAncestry function with begin and
-// rollback.
-func FindAncestryAndRollback(datastore Datastore, name string) (Ancestry, bool, error) {
-	tx, err := datastore.Begin()
-	defer tx.Rollback()
-
-	if err != nil {
-		return Ancestry{}, false, err
-	}
-
-	return tx.FindAncestry(name)
-}
-
-// FindLayerAndRollback wraps session FindLayer function with begin and rollback.
-func FindLayerAndRollback(datastore Datastore, hash string) (layer *Layer, ok bool, err error) {
-	var tx Session
-	if tx, err = datastore.Begin(); err != nil {
-		return
-	}
-
-	defer tx.Rollback()
-	// TODO(sidac): In order to make the session interface more idiomatic, we'll
-	// return the pointer value in the future.
-	var dereferencedLayer Layer
-	dereferencedLayer, ok, err = tx.FindLayer(hash)
-	layer = &dereferencedLayer
-	return
-}
-
-// DeduplicateNamespacedFeatures returns a copy of all unique features in the
-// input.
-func DeduplicateNamespacedFeatures(features []NamespacedFeature) []NamespacedFeature {
-	nsSet := mapset.NewSet()
-	for _, ns := range features {
-		nsSet.Add(ns)
-	}
-
-	uniqueFeatures := make([]NamespacedFeature, 0, nsSet.Cardinality())
-	for ns := range nsSet.Iter() {
-		uniqueFeatures = append(uniqueFeatures, ns.(NamespacedFeature))
-	}
-
-	return uniqueFeatures
-}
-
-// GetAncestryFeatures returns a list of unique namespaced features in the
-// ancestry.
-func GetAncestryFeatures(ancestry Ancestry) []NamespacedFeature {
-	features := []NamespacedFeature{}
-	for _, layer := range ancestry.Layers {
-		features = append(features, layer.GetFeatures()...)
-	}
-
-	return DeduplicateNamespacedFeatures(features)
-}
-
-// UpsertAncestryAndCommit wraps session UpsertAncestry function with begin and commit.
-func UpsertAncestryAndCommit(datastore Datastore, ancestry *Ancestry) error {
-	tx, err := datastore.Begin()
-	if err != nil {
-		return err
-	}
-
-	if err = tx.UpsertAncestry(*ancestry); err != nil {
-		log.WithError(err).Error("failed to upsert the ancestry")
-		serialized, _ := json.Marshal(ancestry)
-		log.Debug(string(serialized))
-
-		tx.Rollback()
-		return err
-	}
-
-	if err = tx.Commit(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// PersistNamespacedFeaturesAndCommit wraps session PersistNamespacedFeatures function
-// with begin and commit.
-func PersistNamespacedFeaturesAndCommit(datastore Datastore, features []NamespacedFeature) error {
-	tx, err := datastore.Begin()
-	if err != nil {
-		return err
-	}
-
-	if err := tx.PersistNamespacedFeatures(features); err != nil {
-		tx.Rollback()
-		return err
-	}
-
-	if err := tx.Commit(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// CacheRelatedVulnerabilityAndCommit wraps session CacheAffectedNamespacedFeatures
-// function with begin and commit.
-func CacheRelatedVulnerabilityAndCommit(datastore Datastore, features []NamespacedFeature) error {
-	tx, err := datastore.Begin()
-	if err != nil {
-		return err
-	}
-
-	if err := tx.CacheAffectedNamespacedFeatures(features); err != nil {
-		tx.Rollback()
-		return err
-	}
-
-	return tx.Commit()
-}
-
-// IntersectDetectors returns the detectors in both d1 and d2.
-func IntersectDetectors(d1 []Detector, d2 []Detector) []Detector {
-	d1Set := mapset.NewSet()
-	for _, d := range d1 {
-		d1Set.Add(d)
-	}
-
-	d2Set := mapset.NewSet()
-	for _, d := range d2 {
-		d2Set.Add(d)
-	}
-
-	inter := d1Set.Intersect(d2Set)
-	detectors := make([]Detector, 0, inter.Cardinality())
-	for d := range inter.Iter() {
-		detectors = append(detectors, d.(Detector))
-	}
-
-	return detectors
-}
-
-// DiffDetectors returns the detectors belongs to d1 but not d2
-func DiffDetectors(d1 []Detector, d2 []Detector) []Detector {
-	d1Set := mapset.NewSet()
-	for _, d := range d1 {
-		d1Set.Add(d)
-	}
-
-	d2Set := mapset.NewSet()
-	for _, d := range d2 {
-		d2Set.Add(d)
-	}
-
-	diff := d1Set.Difference(d2Set)
-	detectors := make([]Detector, 0, diff.Cardinality())
-	for d := range diff.Iter() {
-		detectors = append(detectors, d.(Detector))
-	}
-
-	return detectors
-}
-
-// MergeLayers merges all content in new layer to l, where the content is
-// updated.
-func MergeLayers(l *Layer, new *Layer) *Layer {
-	featureSet := mapset.NewSet()
-	namespaceSet := mapset.NewSet()
-	bySet := mapset.NewSet()
-
-	for _, f := range l.Features {
-		featureSet.Add(f)
-	}
-
-	for _, ns := range l.Namespaces {
-		namespaceSet.Add(ns)
-	}
-
-	for _, d := range l.By {
-		bySet.Add(d)
-	}
-
-	for _, feature := range new.Features {
-		if !featureSet.Contains(feature) {
-			l.Features = append(l.Features, feature)
-			featureSet.Add(feature)
-		}
-	}
-
-	for _, namespace := range new.Namespaces {
-		if !namespaceSet.Contains(namespace) {
-			l.Namespaces = append(l.Namespaces, namespace)
-			namespaceSet.Add(namespace)
-		}
-	}
-
-	for _, detector := range new.By {
-		if !bySet.Contains(detector) {
-			l.By = append(l.By, detector)
-			bySet.Add(detector)
-		}
-	}
-
-	return l
-}
-
-// AcquireLock acquires a named global lock for a duration.
-func AcquireLock(datastore Datastore, name, owner string, duration time.Duration) (acquired bool, expiration time.Time) {
-	tx, err := datastore.Begin()
-	if err != nil {
-		return false, time.Time{}
-	}
-	defer tx.Rollback()
-
-	locked, t, err := tx.AcquireLock(name, owner, duration)
-	if err != nil {
-		return false, time.Time{}
-	}
-
-	if locked {
-		if err := tx.Commit(); err != nil {
-			return false, time.Time{}
-		}
-	}
-
-	return locked, t
-}
-
-// ExtendLock extends the duration of an existing global lock for the given
-// duration.
-func ExtendLock(ds Datastore, name, whoami string, desiredLockDuration time.Duration) (bool, time.Time) {
-	tx, err := ds.Begin()
-	if err != nil {
-		return false, time.Time{}
-	}
-	defer tx.Rollback()
-
-	locked, expiration, err := tx.ExtendLock(name, whoami, desiredLockDuration)
-	if err != nil {
-		return false, time.Time{}
-	}
-
-	if locked {
-		if err := tx.Commit(); err == nil {
-			return locked, expiration
-		}
-	}
-
-	return false, time.Time{}
-}
-
-// ReleaseLock releases a named global lock.
-func ReleaseLock(datastore Datastore, name, owner string) {
-	tx, err := datastore.Begin()
-	if err != nil {
-		return
-	}
-	defer tx.Rollback()
-
-	if err := tx.ReleaseLock(name, owner); err != nil {
-		return
-	}
-	if err := tx.Commit(); err != nil {
-		return
-	}
-}
-
-// PersistDetectorsAndCommit stores the detectors in the data store.
-func PersistDetectorsAndCommit(store Datastore, detectors []Detector) error {
-	tx, err := store.Begin()
-	if err != nil {
-		return err
-	}
-
-	defer tx.Rollback()
-	if err := tx.PersistDetectors(detectors); err != nil {
-		return err
-	}
-
-	if err := tx.Commit(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// MarkNotificationAsReadAndCommit marks a notification as read.
-func MarkNotificationAsReadAndCommit(store Datastore, name string) (bool, error) {
-	tx, err := store.Begin()
-	if err != nil {
-		return false, err
-	}
-
-	defer tx.Rollback()
-	err = tx.DeleteNotification(name)
-	if err == commonerr.ErrNotFound {
-		return false, nil
-	} else if err != nil {
-		return false, err
-	}
-
-	if err := tx.Commit(); err != nil {
-		return false, err
-	}
-
-	return true, nil
-}
-
-// FindAffectedNamespacedFeaturesAndRollback finds the vulnerabilities on each
-// feature.
-func FindAffectedNamespacedFeaturesAndRollback(store Datastore, features []NamespacedFeature) ([]NullableAffectedNamespacedFeature, error) {
-	tx, err := store.Begin()
-	if err != nil {
-		return nil, err
-	}
-
-	defer tx.Rollback()
-	nullableFeatures, err := tx.FindAffectedNamespacedFeatures(features)
-	if err != nil {
-		return nil, err
-	}
-
-	return nullableFeatures, nil
-}
-
-// FindVulnerabilityNotificationAndRollback finds the vulnerability notification
-// and rollback.
-func FindVulnerabilityNotificationAndRollback(store Datastore, name string, limit int, oldVulnerabilityPage pagination.Token, newVulnerabilityPage pagination.Token) (VulnerabilityNotificationWithVulnerable, bool, error) {
-	tx, err := store.Begin()
-	if err != nil {
-		return VulnerabilityNotificationWithVulnerable{}, false, err
-	}
-
-	defer tx.Rollback()
-	return tx.FindVulnerabilityNotification(name, limit, oldVulnerabilityPage, newVulnerabilityPage)
-}
-
-// FindNewNotification finds notifications either never notified or notified
-// before the given time.
-func FindNewNotification(store Datastore, notifiedBefore time.Time) (NotificationHook, bool, error) {
-	tx, err := store.Begin()
-	if err != nil {
-		return NotificationHook{}, false, err
-	}
-
-	defer tx.Rollback()
-	return tx.FindNewNotification(notifiedBefore)
-}
-
-// UpdateKeyValueAndCommit stores the key value to storage.
-func UpdateKeyValueAndCommit(store Datastore, key, value string) error {
-	tx, err := store.Begin()
-	if err != nil {
-		return err
-	}
-
-	defer tx.Rollback()
-	if err = tx.UpdateKeyValue(key, value); err != nil {
-		return err
-	}
-
-	return tx.Commit()
-}
-
-// InsertVulnerabilityNotificationsAndCommit inserts the notifications into db
-// and commit.
-func InsertVulnerabilityNotificationsAndCommit(store Datastore, notifications []VulnerabilityNotification) error {
-	tx, err := store.Begin()
-	if err != nil {
-		return err
-	}
-	defer tx.Rollback()
-
-	if err := tx.InsertVulnerabilityNotifications(notifications); err != nil {
-		return err
-	}
-
-	return tx.Commit()
-}
-
-// FindVulnerabilitiesAndRollback finds the vulnerabilities based on given ids.
-func FindVulnerabilitiesAndRollback(store Datastore, ids []VulnerabilityID) ([]NullableVulnerability, error) {
-	tx, err := store.Begin()
-	if err != nil {
-		return nil, err
-	}
-
-	defer tx.Rollback()
-	return tx.FindVulnerabilities(ids)
-}
-
-func UpdateVulnerabilitiesAndCommit(store Datastore, toRemove []VulnerabilityID, toAdd []VulnerabilityWithAffected) error {
-	tx, err := store.Begin()
-	if err != nil {
-		return err
-	}
-
-	if err := tx.DeleteVulnerabilities(toRemove); err != nil {
-		return err
-	}
-
-	if err := tx.InsertVulnerabilities(toAdd); err != nil {
-		return err
-	}
-
-	return tx.Commit()
-}
--- a/database/detector.go
+++ b/database/detector.go
@ -1,144 +0,0 @@
-// Copyright 2018 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-import (
-	"database/sql/driver"
-	"errors"
-	"fmt"
-	"strings"
-)
-
-const (
-	// NamespaceDetectorType is a type of detector that extracts the namespaces.
-	NamespaceDetectorType DetectorType = "namespace"
-	// FeatureDetectorType is a type of detector that extracts the features.
-	FeatureDetectorType DetectorType = "feature"
-)
-
-// DetectorTypes contains all detector types.
-var (
-	DetectorTypes = []DetectorType{
-		NamespaceDetectorType,
-		FeatureDetectorType,
-	}
-	// ErrFailedToParseDetectorType is the error returned when a detector type could
-	// not be parsed from a string.
-	ErrFailedToParseDetectorType = errors.New("failed to parse DetectorType from input")
-	// ErrInvalidDetector is the error returned when a detector from database has
-	// invalid name or version or type.
-	ErrInvalidDetector = errors.New("the detector has invalid metadata")
-)
-
-// DetectorType is the type of a detector.
-type DetectorType string
-
-// Value implements the database/sql/driver.Valuer interface.
-func (s DetectorType) Value() (driver.Value, error) {
-	return string(s), nil
-}
-
-// Scan implements the database/sql.Scanner interface.
-func (s *DetectorType) Scan(value interface{}) error {
-	val, ok := value.([]byte)
-	if !ok {
-		return errors.New("could not scan a Severity from a non-string input")
-	}
-
-	var err error
-	*s, err = NewDetectorType(string(val))
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-// NewDetectorType attempts to parse a string into a standard DetectorType
-// value.
-func NewDetectorType(s string) (DetectorType, error) {
-	for _, ss := range DetectorTypes {
-		if strings.EqualFold(s, string(ss)) {
-			return ss, nil
-		}
-	}
-
-	return "", ErrFailedToParseDetectorType
-}
-
-// Valid checks if a detector type is defined.
-func (s DetectorType) Valid() bool {
-	for _, t := range DetectorTypes {
-		if s == t {
-			return true
-		}
-	}
-
-	return false
-}
-
-// Detector is an versioned Clair extension.
-type Detector struct {
-	// Name of an extension should be non-empty and uniquely identifies the
-	// extension.
-	Name string `json:"name"`
-	// Version of an extension should be non-empty.
-	Version string `json:"version"`
-	// DType is the type of the extension and should be one of the types in
-	// DetectorTypes.
-	DType DetectorType `json:"dtype"`
-}
-
-// Valid checks if all fields in the detector satisfies the spec.
-func (d Detector) Valid() bool {
-	if d.Name == "" || d.Version == "" || !d.DType.Valid() {
-		return false
-	}
-
-	return true
-}
-
-// String returns a unique string representation of the detector.
-func (d Detector) String() string {
-	return fmt.Sprintf("%s:%s", d.Name, d.Version)
-}
-
-// NewNamespaceDetector returns a new namespace detector.
-func NewNamespaceDetector(name, version string) Detector {
-	return Detector{
-		Name:    name,
-		Version: version,
-		DType:   NamespaceDetectorType,
-	}
-}
-
-// NewFeatureDetector returns a new feature detector.
-func NewFeatureDetector(name, version string) Detector {
-	return Detector{
-		Name:    name,
-		Version: version,
-		DType:   FeatureDetectorType,
-	}
-}
-
-// SerializeDetectors returns the string representation of given detectors.
-func SerializeDetectors(detectors []Detector) []string {
-	strDetectors := []string{}
-	for _, d := range detectors {
-		strDetectors = append(strDetectors, d.String())
-	}
-
-	return strDetectors
-}
--- a/database/error.go
+++ b/database/error.go
@ -1,35 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-// StorageError is database error
-type StorageError struct {
-	reason   string
-	original error
-}
-
-func (e *StorageError) Error() string {
-	return e.reason
-}
-
-// NewStorageErrorWithInternalError creates a new database error
-func NewStorageErrorWithInternalError(reason string, originalError error) *StorageError {
-	return &StorageError{reason, originalError}
-}
-
-// NewStorageError creates a new database error
-func NewStorageError(reason string) *StorageError {
-	return &StorageError{reason, nil}
-}
--- a/database/feature.go
+++ b/database/feature.go
@ -1,96 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-// Feature represents a package detected in a layer but the namespace is not
-// determined.
-//
-// e.g. Name: Libssl1.0, Version: 1.0, VersionFormat: dpkg, Type: binary
-// dpkg is the version format of the installer package manager, which in this
-// case could be dpkg or apk.
-type Feature struct {
-	Name          string      `json:"name"`
-	Version       string      `json:"version"`
-	VersionFormat string      `json:"versionFormat"`
-	Type          FeatureType `json:"type"`
-}
-
-// NamespacedFeature is a feature with determined namespace and can be affected
-// by vulnerabilities.
-//
-// e.g. OpenSSL 1.0 dpkg Debian:7.
-type NamespacedFeature struct {
-	Feature `json:"feature"`
-
-	Namespace Namespace `json:"namespace"`
-}
-
-// AffectedNamespacedFeature is a namespaced feature affected by the
-// vulnerabilities with fixed-in versions for this feature.
-type AffectedNamespacedFeature struct {
-	NamespacedFeature
-
-	AffectedBy []VulnerabilityWithFixedIn
-}
-
-// VulnerabilityWithFixedIn is used for AffectedNamespacedFeature to retrieve
-// the affecting vulnerabilities and the fixed-in versions for the feature.
-type VulnerabilityWithFixedIn struct {
-	Vulnerability
-
-	FixedInVersion string
-}
-
-// AffectedFeature is used to determine whether a namespaced feature is affected
-// by a Vulnerability. Namespace and Feature Name is unique. Affected Feature is
-// bound to vulnerability.
-type AffectedFeature struct {
-	// FeatureType determines which type of package it affects.
-	FeatureType FeatureType
-	Namespace   Namespace
-	FeatureName string
-	// FixedInVersion is known next feature version that's not affected by the
-	// vulnerability. Empty FixedInVersion means the unaffected version is
-	// unknown.
-	FixedInVersion string
-	// AffectedVersion contains the version range to determine whether or not a
-	// feature is affected.
-	AffectedVersion string
-}
-
-// NullableAffectedNamespacedFeature is an affectednamespacedfeature with
-// whether it's found in datastore.
-type NullableAffectedNamespacedFeature struct {
-	AffectedNamespacedFeature
-
-	Valid bool
-}
-
-func NewFeature(name string, version string, versionFormat string, featureType FeatureType) *Feature {
-	return &Feature{name, version, versionFormat, featureType}
-}
-
-func NewBinaryPackage(name string, version string, versionFormat string) *Feature {
-	return &Feature{name, version, versionFormat, BinaryPackage}
-}
-
-func NewSourcePackage(name string, version string, versionFormat string) *Feature {
-	return &Feature{name, version, versionFormat, SourcePackage}
-}
-
-func NewNamespacedFeature(namespace *Namespace, feature *Feature) *NamespacedFeature {
-	// TODO: namespaced feature should use pointer values
-	return &NamespacedFeature{*feature, *namespace}
-}
--- a/database/feature_type.go
+++ b/database/feature_type.go
@ -1,52 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-import (
-	"database/sql/driver"
-	"fmt"
-)
-
-// FeatureType indicates the type of feature that a vulnerability
-// affects.
-type FeatureType string
-
-const (
-	SourcePackage FeatureType = "source"
-	BinaryPackage FeatureType = "binary"
-)
-
-var featureTypes = []FeatureType{
-	SourcePackage,
-	BinaryPackage,
-}
-
-// Scan implements the database/sql.Scanner interface.
-func (t *FeatureType) Scan(value interface{}) error {
-	val := value.(string)
-	for _, ft := range featureTypes {
-		if string(ft) == val {
-			*t = ft
-			return nil
-		}
-	}
-
-	panic(fmt.Sprintf("invalid feature type received from database: '%s'", val))
-}
-
-// Value implements the database/sql/driver.Valuer interface.
-func (t *FeatureType) Value() (driver.Value, error) {
-	return string(*t), nil
-}
--- a/database/layer.go
+++ b/database/layer.go
@ -1,65 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-// Layer is a layer with all the detected features and namespaces.
-type Layer struct {
-	// Hash is the sha-256 tarsum on the layer's blob content.
-	Hash string `json:"hash"`
-	// By contains a list of detectors scanned this Layer.
-	By         []Detector       `json:"by"`
-	Namespaces []LayerNamespace `json:"namespaces"`
-	Features   []LayerFeature   `json:"features"`
-}
-
-func (l *Layer) GetFeatures() []Feature {
-	features := make([]Feature, 0, len(l.Features))
-	for _, f := range l.Features {
-		features = append(features, f.Feature)
-	}
-
-	return features
-}
-
-func (l *Layer) GetNamespaces() []Namespace {
-	namespaces := make([]Namespace, 0, len(l.Namespaces)+len(l.Features))
-	for _, ns := range l.Namespaces {
-		namespaces = append(namespaces, ns.Namespace)
-	}
-	for _, f := range l.Features {
-		if f.PotentialNamespace.Valid() {
-			namespaces = append(namespaces, f.PotentialNamespace)
-		}
-	}
-
-	return namespaces
-}
-
-// LayerNamespace is a namespace with detection information.
-type LayerNamespace struct {
-	Namespace `json:"namespace"`
-
-	// By is the detector found the namespace.
-	By Detector `json:"by"`
-}
-
-// LayerFeature is a feature with detection information.
-type LayerFeature struct {
-	Feature `json:"feature"`
-
-	// By is the detector found the feature.
-	By                 Detector  `json:"by"`
-	PotentialNamespace Namespace `json:"potentialNamespace"`
-}
--- a/database/metadata.go
+++ b/database/metadata.go
@ -1,41 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-import (
-	"database/sql/driver"
-	"encoding/json"
-)
-
-// MetadataMap is for storing the metadata returned by vulnerability database.
-type MetadataMap map[string]interface{}
-
-func (mm *MetadataMap) Scan(value interface{}) error {
-	if value == nil {
-		return nil
-	}
-
-	// github.com/lib/pq decodes TEXT/VARCHAR fields into strings.
-	val, ok := value.(string)
-	if !ok {
-		panic("got type other than []byte from database")
-	}
-	return json.Unmarshal([]byte(val), mm)
-}
-
-func (mm *MetadataMap) Value() (driver.Value, error) {
-	json, err := json.Marshal(*mm)
-	return string(json), err
-}
--- a/database/mock.go
+++ b/database/mock.go
@ -14,41 +14,39 @@

 package database

-import (
-	"time"
-
-	"github.com/coreos/clair/pkg/pagination"
-)
+import "time"

 // MockSession implements Session and enables overriding each available method.
 // The default behavior of each method is to simply panic.
 type MockSession struct {
 	FctCommit                           func() error
 	FctRollback                         func() error
-	FctUpsertAncestry                   func(Ancestry) error
-	FctFindAncestry                     func(name string) (Ancestry, bool, error)
+	FctUpsertAncestry                   func(Ancestry, []NamespacedFeature, Processors) error
+	FctFindAncestry                     func(name string) (Ancestry, Processors, bool, error)
+	FctFindAncestryFeatures             func(name string) (AncestryWithFeatures, bool, error)
 	FctFindAffectedNamespacedFeatures   func(features []NamespacedFeature) ([]NullableAffectedNamespacedFeature, error)
 	FctPersistNamespaces                func([]Namespace) error
 	FctPersistFeatures                  func([]Feature) error
-	FctPersistDetectors                 func(detectors []Detector) error
 	FctPersistNamespacedFeatures        func([]NamespacedFeature) error
 	FctCacheAffectedNamespacedFeatures  func([]NamespacedFeature) error
-	FctPersistLayer                     func(hash string, features []LayerFeature, namespaces []LayerNamespace, by []Detector) error
-	FctFindLayer                        func(name string) (Layer, bool, error)
+	FctPersistLayer                     func(Layer) error
+	FctPersistLayerContent              func(hash string, namespaces []Namespace, features []Feature, processedBy Processors) error
+	FctFindLayer                        func(name string) (Layer, Processors, bool, error)
+	FctFindLayerWithContent             func(name string) (LayerWithContent, bool, error)
 	FctInsertVulnerabilities            func([]VulnerabilityWithAffected) error
 	FctFindVulnerabilities              func([]VulnerabilityID) ([]NullableVulnerability, error)
 	FctDeleteVulnerabilities            func([]VulnerabilityID) error
 	FctInsertVulnerabilityNotifications func([]VulnerabilityNotification) error
 	FctFindNewNotification              func(lastNotified time.Time) (NotificationHook, bool, error)
-	FctFindVulnerabilityNotification    func(name string, limit int, oldPage pagination.Token, newPage pagination.Token) (
+	FctFindVulnerabilityNotification    func(name string, limit int, oldPage PageNumber, newPage PageNumber) (
 		vuln VulnerabilityNotificationWithVulnerable, ok bool, err error)
-	FctMarkNotificationAsRead func(name string) error
+	FctMarkNotificationNotified func(name string) error
 	FctDeleteNotification       func(name string) error
 	FctUpdateKeyValue           func(key, value string) error
 	FctFindKeyValue             func(key string) (string, bool, error)
-	FctAcquireLock            func(name, owner string, duration time.Duration) (bool, time.Time, error)
-	FctExtendLock             func(name, owner string, duration time.Duration) (bool, time.Time, error)
-	FctReleaseLock            func(name, owner string) error
+	FctLock                     func(name string, owner string, duration time.Duration, renew bool) (bool, time.Time, error)
+	FctUnlock                   func(name, owner string) error
+	FctFindLock                 func(name string) (string, time.Time, bool, error)
 }

 func (ms *MockSession) Commit() error {
@ -65,20 +63,27 @@ func (ms *MockSession) Rollback() error {
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) UpsertAncestry(ancestry Ancestry) error {
+func (ms *MockSession) UpsertAncestry(ancestry Ancestry, features []NamespacedFeature, processedBy Processors) error {
 	if ms.FctUpsertAncestry != nil {
-		return ms.FctUpsertAncestry(ancestry)
+		return ms.FctUpsertAncestry(ancestry, features, processedBy)
 	}
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) FindAncestry(name string) (Ancestry, bool, error) {
+func (ms *MockSession) FindAncestry(name string) (Ancestry, Processors, bool, error) {
 	if ms.FctFindAncestry != nil {
 		return ms.FctFindAncestry(name)
 	}
 	panic("required mock function not implemented")
 }

+func (ms *MockSession) FindAncestryFeatures(name string) (AncestryWithFeatures, bool, error) {
+	if ms.FctFindAncestryFeatures != nil {
+		return ms.FctFindAncestryFeatures(name)
+	}
+	panic("required mock function not implemented")
+}
+
 func (ms *MockSession) FindAffectedNamespacedFeatures(features []NamespacedFeature) ([]NullableAffectedNamespacedFeature, error) {
 	if ms.FctFindAffectedNamespacedFeatures != nil {
 		return ms.FctFindAffectedNamespacedFeatures(features)
@ -86,13 +91,6 @@ func (ms *MockSession) FindAffectedNamespacedFeatures(features []NamespacedFeatu
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) PersistDetectors(detectors []Detector) error {
-	if ms.FctPersistDetectors != nil {
-		return ms.FctPersistDetectors(detectors)
-	}
-	panic("required mock function not implemented")
-}
-
 func (ms *MockSession) PersistNamespaces(namespaces []Namespace) error {
 	if ms.FctPersistNamespaces != nil {
 		return ms.FctPersistNamespaces(namespaces)
@ -121,20 +119,34 @@ func (ms *MockSession) CacheAffectedNamespacedFeatures(namespacedFeatures []Name
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) PersistLayer(hash string, features []LayerFeature, namespaces []LayerNamespace, detectors []Detector) error {
+func (ms *MockSession) PersistLayer(layer Layer) error {
 	if ms.FctPersistLayer != nil {
-		return ms.FctPersistLayer(hash, features, namespaces, detectors)
+		return ms.FctPersistLayer(layer)
 	}
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) FindLayer(name string) (Layer, bool, error) {
+func (ms *MockSession) PersistLayerContent(hash string, namespaces []Namespace, features []Feature, processedBy Processors) error {
+	if ms.FctPersistLayerContent != nil {
+		return ms.FctPersistLayerContent(hash, namespaces, features, processedBy)
+	}
+	panic("required mock function not implemented")
+}
+
+func (ms *MockSession) FindLayer(name string) (Layer, Processors, bool, error) {
 	if ms.FctFindLayer != nil {
 		return ms.FctFindLayer(name)
 	}
 	panic("required mock function not implemented")
 }

+func (ms *MockSession) FindLayerWithContent(name string) (LayerWithContent, bool, error) {
+	if ms.FctFindLayerWithContent != nil {
+		return ms.FctFindLayerWithContent(name)
+	}
+	panic("required mock function not implemented")
+}
+
 func (ms *MockSession) InsertVulnerabilities(vulnerabilities []VulnerabilityWithAffected) error {
 	if ms.FctInsertVulnerabilities != nil {
 		return ms.FctInsertVulnerabilities(vulnerabilities)
@ -170,7 +182,7 @@ func (ms *MockSession) FindNewNotification(lastNotified time.Time) (Notification
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) FindVulnerabilityNotification(name string, limit int, oldPage pagination.Token, newPage pagination.Token) (
+func (ms *MockSession) FindVulnerabilityNotification(name string, limit int, oldPage PageNumber, newPage PageNumber) (
 	VulnerabilityNotificationWithVulnerable, bool, error) {
 	if ms.FctFindVulnerabilityNotification != nil {
 		return ms.FctFindVulnerabilityNotification(name, limit, oldPage, newPage)
@ -178,9 +190,9 @@ func (ms *MockSession) FindVulnerabilityNotification(name string, limit int, old
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) MarkNotificationAsRead(name string) error {
-	if ms.FctMarkNotificationAsRead != nil {
-		return ms.FctMarkNotificationAsRead(name)
+func (ms *MockSession) MarkNotificationNotified(name string) error {
+	if ms.FctMarkNotificationNotified != nil {
+		return ms.FctMarkNotificationNotified(name)
 	}
 	panic("required mock function not implemented")
 }
@ -206,23 +218,23 @@ func (ms *MockSession) FindKeyValue(key string) (string, bool, error) {
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) AcquireLock(name, owner string, duration time.Duration) (bool, time.Time, error) {
-	if ms.FctAcquireLock != nil {
-		return ms.FctAcquireLock(name, owner, duration)
+func (ms *MockSession) Lock(name string, owner string, duration time.Duration, renew bool) (bool, time.Time, error) {
+	if ms.FctLock != nil {
+		return ms.FctLock(name, owner, duration, renew)
 	}
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) ExtendLock(name, owner string, duration time.Duration) (bool, time.Time, error) {
-	if ms.FctExtendLock != nil {
-		return ms.FctExtendLock(name, owner, duration)
+func (ms *MockSession) Unlock(name, owner string) error {
+	if ms.FctUnlock != nil {
+		return ms.FctUnlock(name, owner)
 	}
 	panic("required mock function not implemented")
 }

-func (ms *MockSession) ReleaseLock(name, owner string) error {
-	if ms.FctReleaseLock != nil {
-		return ms.FctReleaseLock(name, owner)
+func (ms *MockSession) FindLock(name string) (string, time.Time, bool, error) {
+	if ms.FctFindLock != nil {
+		return ms.FctFindLock(name)
 	}
 	panic("required mock function not implemented")
 }
--- a/database/models.go
+++ b/database/models.go
@ -0,0 +1,235 @@
+// Copyright 2017 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package database
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"time"
+)
+
+// Processors are extentions to scan layer's content.
+type Processors struct {
+	Listers   []string
+	Detectors []string
+}
+
+// Ancestry is a manifest that keeps all layers in an image in order.
+type Ancestry struct {
+	Name string
+	// Layers should be ordered and i_th layer is the parent of i+1_th layer in
+	// the slice.
+	Layers []Layer
+}
+
+// AncestryWithFeatures is an ancestry with namespaced features detected in the
+// ancestry, which is processed by `ProcessedBy`.
+type AncestryWithFeatures struct {
+	Ancestry
+
+	ProcessedBy Processors
+	Features    []NamespacedFeature
+}
+
+// Layer corresponds to a layer in an image processed by `ProcessedBy`.
+type Layer struct {
+	// Hash is content hash of the layer.
+	Hash string
+}
+
+// LayerWithContent is a layer with its detected namespaces and features by
+// ProcessedBy.
+type LayerWithContent struct {
+	Layer
+
+	ProcessedBy Processors
+	Namespaces  []Namespace
+	Features    []Feature
+}
+
+// Namespace is the contextual information around features.
+//
+// e.g. Debian:7, NodeJS.
+type Namespace struct {
+	Name          string
+	VersionFormat string
+}
+
+// Feature represents a package detected in a layer but the namespace is not
+// determined.
+//
+// e.g. Name: OpenSSL, Version: 1.0, VersionFormat: dpkg.
+// dpkg implies the installer package manager but the namespace (might be
+// debian:7, debian:8, ...) could not be determined.
+type Feature struct {
+	Name          string
+	Version       string
+	VersionFormat string
+}
+
+// NamespacedFeature is a feature with determined namespace and can be affected
+// by vulnerabilities.
+//
+// e.g. OpenSSL 1.0 dpkg Debian:7.
+type NamespacedFeature struct {
+	Feature
+
+	Namespace Namespace
+}
+
+// AffectedNamespacedFeature is a namespaced feature affected by the
+// vulnerabilities with fixed-in versions for this feature.
+type AffectedNamespacedFeature struct {
+	NamespacedFeature
+
+	AffectedBy []VulnerabilityWithFixedIn
+}
+
+// VulnerabilityWithFixedIn is used for AffectedNamespacedFeature to retrieve
+// the affecting vulnerabilities and the fixed-in versions for the feature.
+type VulnerabilityWithFixedIn struct {
+	Vulnerability
+
+	FixedInVersion string
+}
+
+// AffectedFeature is used to determine whether a namespaced feature is affected
+// by a Vulnerability. Namespace and Feature Name is unique. Affected Feature is
+// bound to vulnerability.
+type AffectedFeature struct {
+	Namespace   Namespace
+	FeatureName string
+	// FixedInVersion is known next feature version that's not affected by the
+	// vulnerability. Empty FixedInVersion means the unaffected version is
+	// unknown.
+	FixedInVersion string
+	// AffectedVersion contains the version range to determine whether or not a
+	// feature is affected.
+	AffectedVersion string
+}
+
+// VulnerabilityID is an identifier for every vulnerability. Every vulnerability
+// has unique namespace and name.
+type VulnerabilityID struct {
+	Name      string
+	Namespace string
+}
+
+// Vulnerability represents CVE or similar vulnerability reports.
+type Vulnerability struct {
+	Name      string
+	Namespace Namespace
+
+	Description string
+	Link        string
+	Severity    Severity
+
+	Metadata MetadataMap
+}
+
+// VulnerabilityWithAffected is an vulnerability with all known affected
+// features.
+type VulnerabilityWithAffected struct {
+	Vulnerability
+
+	Affected []AffectedFeature
+}
+
+// PagedVulnerableAncestries is a vulnerability with a page of affected
+// ancestries each with a special index attached for streaming purpose. The
+// current page number and next page number are for navigate.
+type PagedVulnerableAncestries struct {
+	Vulnerability
+
+	// Affected is a map of special indexes to Ancestries, which the pair
+	// should be unique in a stream. Every indexes in the map should be larger
+	// than previous page.
+	Affected map[int]string
+
+	Limit   int
+	Current PageNumber
+	Next    PageNumber
+
+	// End signals the end of the pages.
+	End bool
+}
+
+// NotificationHook is a message sent to another service to inform of a change
+// to a Vulnerability or the Ancestries affected by a Vulnerability. It contains
+// the name of a notification that should be read and marked as read via the
+// API.
+type NotificationHook struct {
+	Name string
+
+	Created  time.Time
+	Notified time.Time
+	Deleted  time.Time
+}
+
+// VulnerabilityNotification is a notification for vulnerability changes.
+type VulnerabilityNotification struct {
+	NotificationHook
+
+	Old *Vulnerability
+	New *Vulnerability
+}
+
+// VulnerabilityNotificationWithVulnerable is a notification for vulnerability
+// changes with vulnerable ancestries.
+type VulnerabilityNotificationWithVulnerable struct {
+	NotificationHook
+
+	Old *PagedVulnerableAncestries
+	New *PagedVulnerableAncestries
+}
+
+// PageNumber is used to do pagination.
+type PageNumber string
+
+type MetadataMap map[string]interface{}
+
+// NullableAffectedNamespacedFeature is an affectednamespacedfeature with
+// whether it's found in datastore.
+type NullableAffectedNamespacedFeature struct {
+	AffectedNamespacedFeature
+
+	Valid bool
+}
+
+// NullableVulnerability is a vulnerability with whether the vulnerability is
+// found in datastore.
+type NullableVulnerability struct {
+	VulnerabilityWithAffected
+
+	Valid bool
+}
+
+func (mm *MetadataMap) Scan(value interface{}) error {
+	if value == nil {
+		return nil
+	}
+
+	// github.com/lib/pq decodes TEXT/VARCHAR fields into strings.
+	val, ok := value.(string)
+	if !ok {
+		panic("got type other than []byte from database")
+	}
+	return json.Unmarshal([]byte(val), mm)
+}
+
+func (mm *MetadataMap) Value() (driver.Value, error) {
+	json, err := json.Marshal(*mm)
+	return string(json), err
+}
--- a/database/namespace.go
+++ b/database/namespace.go
@ -1,34 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-// Namespace is the contextual information around features.
-//
-// e.g. Debian:7, NodeJS.
-type Namespace struct {
-	Name          string `json:"name"`
-	VersionFormat string `json:"versionFormat"`
-}
-
-func NewNamespace(name string, versionFormat string) *Namespace {
-	return &Namespace{name, versionFormat}
-}
-
-func (ns *Namespace) Valid() bool {
-	if ns.Name == "" || ns.VersionFormat == "" {
-		return false
-	}
-	return true
-}
--- a/database/namespace_mapping.go
+++ b/database/namespace_mapping.go
@ -45,7 +45,4 @@ var UbuntuReleasesMapping = map[string]string{
 	"yakkety": "16.10",
 	"zesty":   "17.04",
 	"artful":  "17.10",
-	"bionic":  "18.04",
-	"cosmic":  "18.10",
-	"disco":   "19.04",
 }
--- a/database/notification.go
+++ b/database/notification.go
@ -1,69 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package database
-
-import (
-	"time"
-
-	"github.com/coreos/clair/pkg/pagination"
-)
-
-// NotificationHook is a message sent to another service to inform of a change
-// to a Vulnerability or the Ancestries affected by a Vulnerability. It contains
-// the name of a notification that should be read and marked as read via the
-// API.
-type NotificationHook struct {
-	Name string
-
-	Created  time.Time
-	Notified time.Time
-	Deleted  time.Time
-}
-
-// VulnerabilityNotification is a notification for vulnerability changes.
-type VulnerabilityNotification struct {
-	NotificationHook
-
-	Old *Vulnerability
-	New *Vulnerability
-}
-
-// VulnerabilityNotificationWithVulnerable is a notification for vulnerability
-// changes with vulnerable ancestries.
-type VulnerabilityNotificationWithVulnerable struct {
-	NotificationHook
-
-	Old *PagedVulnerableAncestries
-	New *PagedVulnerableAncestries
-}
-
-// PagedVulnerableAncestries is a vulnerability with a page of affected
-// ancestries each with a special index attached for streaming purpose. The
-// current page number and next page number are for navigate.
-type PagedVulnerableAncestries struct {
-	Vulnerability
-
-	// Affected is a map of special indexes to Ancestries, which the pair
-	// should be unique in a stream. Every indexes in the map should be larger
-	// than previous page.
-	Affected map[int]string
-
-	Limit   int
-	Current pagination.Token
-	Next    pagination.Token
-
-	// End signals the end of the pages.
-	End bool
-}
--- a/database/pgsql/ancestry.go
+++ b/database/pgsql/ancestry.go
@ -0,0 +1,261 @@
+package pgsql
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/lib/pq"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/coreos/clair/database"
+	"github.com/coreos/clair/pkg/commonerr"
+)
+
+func (tx *pgSession) UpsertAncestry(ancestry database.Ancestry, features []database.NamespacedFeature, processedBy database.Processors) error {
+	if ancestry.Name == "" {
+		log.Warning("Empty ancestry name is not allowed")
+		return commonerr.NewBadRequestError("could not insert an ancestry with empty name")
+	}
+
+	if len(ancestry.Layers) == 0 {
+		log.Warning("Empty ancestry is not allowed")
+		return commonerr.NewBadRequestError("could not insert an ancestry with 0 layers")
+	}
+
+	err := tx.deleteAncestry(ancestry.Name)
+	if err != nil {
+		return err
+	}
+
+	var ancestryID int64
+	err = tx.QueryRow(insertAncestry, ancestry.Name).Scan(&ancestryID)
+	if err != nil {
+		if isErrUniqueViolation(err) {
+			return handleError("insertAncestry", errors.New("Other Go-routine is processing this ancestry (skip)."))
+		}
+		return handleError("insertAncestry", err)
+	}
+
+	err = tx.insertAncestryLayers(ancestryID, ancestry.Layers)
+	if err != nil {
+		return err
+	}
+
+	err = tx.insertAncestryFeatures(ancestryID, features)
+	if err != nil {
+		return err
+	}
+
+	return tx.persistProcessors(persistAncestryLister,
+		"persistAncestryLister",
+		persistAncestryDetector,
+		"persistAncestryDetector",
+		ancestryID, processedBy)
+}
+
+func (tx *pgSession) FindAncestry(name string) (database.Ancestry, database.Processors, bool, error) {
+	ancestry := database.Ancestry{Name: name}
+	processed := database.Processors{}
+
+	var ancestryID int64
+	err := tx.QueryRow(searchAncestry, name).Scan(&ancestryID)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return ancestry, processed, false, nil
+		}
+		return ancestry, processed, false, handleError("searchAncestry", err)
+	}
+
+	ancestry.Layers, err = tx.findAncestryLayers(ancestryID)
+	if err != nil {
+		return ancestry, processed, false, err
+	}
+
+	processed.Detectors, err = tx.findProcessors(searchAncestryDetectors, "searchAncestryDetectors", "detector", ancestryID)
+	if err != nil {
+		return ancestry, processed, false, err
+	}
+
+	processed.Listers, err = tx.findProcessors(searchAncestryListers, "searchAncestryListers", "lister", ancestryID)
+	if err != nil {
+		return ancestry, processed, false, err
+	}
+
+	return ancestry, processed, true, nil
+}
+
+func (tx *pgSession) FindAncestryFeatures(name string) (database.AncestryWithFeatures, bool, error) {
+	var (
+		awf database.AncestryWithFeatures
+		ok  bool
+		err error
+	)
+	awf.Ancestry, awf.ProcessedBy, ok, err = tx.FindAncestry(name)
+	if err != nil {
+		return awf, false, err
+	}
+
+	if !ok {
+		return awf, false, nil
+	}
+
+	rows, err := tx.Query(searchAncestryFeatures, name)
+	if err != nil {
+		return awf, false, handleError("searchAncestryFeatures", err)
+	}
+
+	for rows.Next() {
+		nf := database.NamespacedFeature{}
+		err := rows.Scan(&nf.Namespace.Name, &nf.Namespace.VersionFormat, &nf.Feature.Name, &nf.Feature.Version)
+		if err != nil {
+			return awf, false, handleError("searchAncestryFeatures", err)
+		}
+		nf.Feature.VersionFormat = nf.Namespace.VersionFormat
+		awf.Features = append(awf.Features, nf)
+	}
+
+	return awf, true, nil
+}
+
+func (tx *pgSession) deleteAncestry(name string) error {
+	result, err := tx.Exec(removeAncestry, name)
+	if err != nil {
+		return handleError("removeAncestry", err)
+	}
+
+	_, err = result.RowsAffected()
+	if err != nil {
+		return handleError("removeAncestry", err)
+	}
+
+	return nil
+}
+
+func (tx *pgSession) findProcessors(query, queryName, processorType string, id int64) ([]string, error) {
+	rows, err := tx.Query(query, id)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			log.Warning("No " + processorType + " are used")
+			return nil, nil
+		}
+		return nil, handleError(queryName, err)
+	}
+
+	var (
+		processors []string
+		processor  string
+	)
+
+	for rows.Next() {
+		err := rows.Scan(&processor)
+		if err != nil {
+			return nil, handleError(queryName, err)
+		}
+		processors = append(processors, processor)
+	}
+
+	return processors, nil
+}
+
+func (tx *pgSession) findAncestryLayers(ancestryID int64) ([]database.Layer, error) {
+	rows, err := tx.Query(searchAncestryLayer, ancestryID)
+	if err != nil {
+		return nil, handleError("searchAncestryLayer", err)
+	}
+	layers := []database.Layer{}
+	for rows.Next() {
+		var layer database.Layer
+		err := rows.Scan(&layer.Hash)
+		if err != nil {
+			return nil, handleError("searchAncestryLayer", err)
+		}
+		layers = append(layers, layer)
+	}
+	return layers, nil
+}
+
+func (tx *pgSession) insertAncestryLayers(ancestryID int64, layers []database.Layer) error {
+	layerIDs := map[string]sql.NullInt64{}
+	for _, l := range layers {
+		layerIDs[l.Hash] = sql.NullInt64{}
+	}
+
+	layerHashes := []string{}
+	for hash := range layerIDs {
+		layerHashes = append(layerHashes, hash)
+	}
+
+	rows, err := tx.Query(searchLayerIDs, pq.Array(layerHashes))
+	if err != nil {
+		return handleError("searchLayerIDs", err)
+	}
+
+	for rows.Next() {
+		var (
+			layerID   sql.NullInt64
+			layerName string
+		)
+		err := rows.Scan(&layerID, &layerName)
+		if err != nil {
+			return handleError("searchLayerIDs", err)
+		}
+		layerIDs[layerName] = layerID
+	}
+
+	notFound := []string{}
+	for hash, id := range layerIDs {
+		if !id.Valid {
+			notFound = append(notFound, hash)
+		}
+	}
+
+	if len(notFound) > 0 {
+		return handleError("searchLayerIDs", fmt.Errorf("Layer %s is not found in database", strings.Join(notFound, ",")))
+	}
+
+	//TODO(Sida): use bulk insert.
+	stmt, err := tx.Prepare(insertAncestryLayer)
+	if err != nil {
+		return handleError("insertAncestryLayer", err)
+	}
+
+	defer stmt.Close()
+	for index, layer := range layers {
+		_, err := stmt.Exec(ancestryID, index, layerIDs[layer.Hash].Int64)
+		if err != nil {
+			return handleError("insertAncestryLayer", commonerr.CombineErrors(err, stmt.Close()))
+		}
+	}
+
+	return nil
+}
+
+func (tx *pgSession) insertAncestryFeatures(ancestryID int64, features []database.NamespacedFeature) error {
+	featureIDs, err := tx.findNamespacedFeatureIDs(features)
+	if err != nil {
+		return err
+	}
+
+	//TODO(Sida): use bulk insert.
+	stmtFeatures, err := tx.Prepare(insertAncestryFeature)
+	if err != nil {
+		return handleError("insertAncestryFeature", err)
+	}
+
+	defer stmtFeatures.Close()
+
+	for _, id := range featureIDs {
+		if !id.Valid {
+			return errors.New("requested namespaced feature is not in database")
+		}
+
+		_, err := stmtFeatures.Exec(ancestryID, id)
+		if err != nil {
+			return handleError("insertAncestryFeature", err)
+		}
+	}
+
+	return nil
+}
--- a/database/pgsql/ancestry/ancestry.go
+++ b/database/pgsql/ancestry/ancestry.go
@ -1,160 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ancestry
-
-import (
-	"database/sql"
-	"errors"
-
-	log "github.com/sirupsen/logrus"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/detector"
-	"github.com/coreos/clair/database/pgsql/layer"
-	"github.com/coreos/clair/database/pgsql/util"
-)
-
-const (
-	insertAncestry = `
-		INSERT INTO ancestry (name) VALUES ($1) RETURNING id`
-
-	findAncestryID = `SELECT id FROM ancestry WHERE name = $1`
-	removeAncestry = `DELETE FROM ancestry WHERE name = $1`
-
-	insertAncestryFeatures = `
-		INSERT INTO ancestry_feature
-		(ancestry_layer_id, namespaced_feature_id, feature_detector_id, namespace_detector_id) VALUES
-		($1, $2, $3, $4)`
-)
-
-func FindAncestry(tx *sql.Tx, name string) (database.Ancestry, bool, error) {
-	var (
-		ancestry = database.Ancestry{Name: name}
-		err      error
-	)
-
-	id, ok, err := FindAncestryID(tx, name)
-	if !ok || err != nil {
-		return ancestry, ok, err
-	}
-
-	if ancestry.By, err = FindAncestryDetectors(tx, id); err != nil {
-		return ancestry, false, err
-	}
-
-	if ancestry.Layers, err = FindAncestryLayers(tx, id); err != nil {
-		return ancestry, false, err
-	}
-
-	return ancestry, true, nil
-}
-
-func UpsertAncestry(tx *sql.Tx, ancestry database.Ancestry) error {
-	if !ancestry.Valid() {
-		return database.ErrInvalidParameters
-	}
-
-	if err := RemoveAncestry(tx, ancestry.Name); err != nil {
-		return err
-	}
-
-	id, err := InsertAncestry(tx, ancestry.Name)
-	if err != nil {
-		return err
-	}
-
-	detectorIDs, err := detector.FindDetectorIDs(tx, ancestry.By)
-	if err != nil {
-		return err
-	}
-
-	// insert ancestry metadata
-	if err := InsertAncestryDetectors(tx, id, detectorIDs); err != nil {
-		return err
-	}
-
-	layers := make([]string, 0, len(ancestry.Layers))
-	for _, l := range ancestry.Layers {
-		layers = append(layers, l.Hash)
-	}
-
-	layerIDs, ok, err := layer.FindLayerIDs(tx, layers)
-	if err != nil {
-		return err
-	}
-
-	if !ok {
-		log.Error("layer cannot be found, this indicates that the internal logic of calling UpsertAncestry is wrong or the database is corrupted.")
-		return database.ErrMissingEntities
-	}
-
-	ancestryLayerIDs, err := InsertAncestryLayers(tx, id, layerIDs)
-	if err != nil {
-		return err
-	}
-
-	for i, id := range ancestryLayerIDs {
-		if err := InsertAncestryFeatures(tx, id, ancestry.Layers[i]); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func InsertAncestry(tx *sql.Tx, name string) (int64, error) {
-	var id int64
-	err := tx.QueryRow(insertAncestry, name).Scan(&id)
-	if err != nil {
-		if util.IsErrUniqueViolation(err) {
-			return 0, util.HandleError("insertAncestry", errors.New("other Go-routine is processing this ancestry (skip)"))
-		}
-
-		return 0, util.HandleError("insertAncestry", err)
-	}
-
-	return id, nil
-}
-
-func FindAncestryID(tx *sql.Tx, name string) (int64, bool, error) {
-	var id sql.NullInt64
-	if err := tx.QueryRow(findAncestryID, name).Scan(&id); err != nil {
-		if err == sql.ErrNoRows {
-			return 0, false, nil
-		}
-
-		return 0, false, util.HandleError("findAncestryID", err)
-	}
-
-	return id.Int64, true, nil
-}
-
-func RemoveAncestry(tx *sql.Tx, name string) error {
-	result, err := tx.Exec(removeAncestry, name)
-	if err != nil {
-		return util.HandleError("removeAncestry", err)
-	}
-
-	affected, err := result.RowsAffected()
-	if err != nil {
-		return util.HandleError("removeAncestry", err)
-	}
-
-	if affected != 0 {
-		log.WithField("ancestry", name).Debug("removed ancestry")
-	}
-
-	return nil
-}
--- a/database/pgsql/ancestry/ancestry_detector.go
+++ b/database/pgsql/ancestry/ancestry_detector.go
@ -1,48 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ancestry
-
-import (
-	"database/sql"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/detector"
-	"github.com/coreos/clair/database/pgsql/util"
-)
-
-var selectAncestryDetectors = `
-SELECT d.name, d.version, d.dtype
-	FROM ancestry_detector, detector AS d
-	WHERE ancestry_detector.detector_id = d.id AND ancestry_detector.ancestry_id = $1;`
-
-var insertAncestryDetectors = `
-	INSERT INTO ancestry_detector (ancestry_id, detector_id)
-		SELECT $1, $2
-		WHERE NOT EXISTS (SELECT id FROM ancestry_detector WHERE ancestry_id = $1 AND detector_id = $2)`
-
-func FindAncestryDetectors(tx *sql.Tx, id int64) ([]database.Detector, error) {
-	detectors, err := detector.GetDetectors(tx, selectAncestryDetectors, id)
-	return detectors, err
-}
-
-func InsertAncestryDetectors(tx *sql.Tx, ancestryID int64, detectorIDs []int64) error {
-	for _, detectorID := range detectorIDs {
-		if _, err := tx.Exec(insertAncestryDetectors, ancestryID, detectorID); err != nil {
-			return util.HandleError("insertAncestryDetectors", err)
-		}
-	}
-
-	return nil
-}
--- a/database/pgsql/ancestry/ancestry_feature.go
+++ b/database/pgsql/ancestry/ancestry_feature.go
@ -1,146 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ancestry
-
-import (
-	"database/sql"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/detector"
-	"github.com/coreos/clair/database/pgsql/feature"
-	"github.com/coreos/clair/database/pgsql/util"
-	"github.com/coreos/clair/pkg/commonerr"
-)
-
-const findAncestryFeatures = `
-	SELECT namespace.name, namespace.version_format, feature.name, 
-		feature.version, feature.version_format, feature_type.name, ancestry_layer.ancestry_index, 
-		ancestry_feature.feature_detector_id, ancestry_feature.namespace_detector_id
-	FROM namespace, feature, feature_type, namespaced_feature, ancestry_layer, ancestry_feature
-	WHERE ancestry_layer.ancestry_id = $1
-		AND feature_type.id = feature.type
-		AND ancestry_feature.ancestry_layer_id = ancestry_layer.id
-		AND ancestry_feature.namespaced_feature_id = namespaced_feature.id
-		AND namespaced_feature.feature_id = feature.id
-		AND namespaced_feature.namespace_id = namespace.id`
-
-func FindAncestryFeatures(tx *sql.Tx, ancestryID int64, detectors detector.DetectorMap) (map[int64][]database.AncestryFeature, error) {
-	// ancestry_index -> ancestry features
-	featureMap := make(map[int64][]database.AncestryFeature)
-	// retrieve ancestry layer's namespaced features
-	rows, err := tx.Query(findAncestryFeatures, ancestryID)
-	if err != nil {
-		return nil, util.HandleError("findAncestryFeatures", err)
-	}
-
-	defer rows.Close()
-
-	for rows.Next() {
-		var (
-			featureDetectorID   int64
-			namespaceDetectorID sql.NullInt64
-			feature             database.NamespacedFeature
-			// index is used to determine which layer the feature belongs to.
-			index sql.NullInt64
-		)
-
-		if err := rows.Scan(
-			&feature.Namespace.Name,
-			&feature.Namespace.VersionFormat,
-			&feature.Feature.Name,
-			&feature.Feature.Version,
-			&feature.Feature.VersionFormat,
-			&feature.Feature.Type,
-			&index,
-			&featureDetectorID,
-			&namespaceDetectorID,
-		); err != nil {
-			return nil, util.HandleError("findAncestryFeatures", err)
-		}
-
-		if feature.Feature.VersionFormat != feature.Namespace.VersionFormat {
-			// Feature must have the same version format as the associated
-			// namespace version format.
-			return nil, database.ErrInconsistent
-		}
-
-		fDetector, ok := detectors.ByID[featureDetectorID]
-		if !ok {
-			return nil, database.ErrInconsistent
-		}
-
-		var nsDetector database.Detector
-		if !namespaceDetectorID.Valid {
-			nsDetector = database.Detector{}
-		} else {
-			nsDetector, ok = detectors.ByID[namespaceDetectorID.Int64]
-			if !ok {
-				return nil, database.ErrInconsistent
-			}
-		}
-
-		featureMap[index.Int64] = append(featureMap[index.Int64], database.AncestryFeature{
-			NamespacedFeature: feature,
-			FeatureBy:         fDetector,
-			NamespaceBy:       nsDetector,
-		})
-	}
-
-	return featureMap, nil
-}
-
-func InsertAncestryFeatures(tx *sql.Tx, ancestryLayerID int64, layer database.AncestryLayer) error {
-	detectors, err := detector.FindAllDetectors(tx)
-	if err != nil {
-		return err
-	}
-
-	nsFeatureIDs, err := feature.FindNamespacedFeatureIDs(tx, layer.GetFeatures())
-	if err != nil {
-		return err
-	}
-
-	// find the detectors for each feature
-	stmt, err := tx.Prepare(insertAncestryFeatures)
-	if err != nil {
-		return util.HandleError("insertAncestryFeatures", err)
-	}
-
-	defer stmt.Close()
-
-	for index, id := range nsFeatureIDs {
-		if !id.Valid {
-			return database.ErrMissingEntities
-		}
-
-		var namespaceDetectorID sql.NullInt64
-		var ok bool
-		namespaceDetectorID.Int64, ok = detectors.ByValue[layer.Features[index].NamespaceBy]
-		if ok {
-			namespaceDetectorID.Valid = true
-		}
-
-		featureDetectorID, ok := detectors.ByValue[layer.Features[index].FeatureBy]
-		if !ok {
-			return database.ErrMissingEntities
-		}
-
-		if _, err := stmt.Exec(ancestryLayerID, id, featureDetectorID, namespaceDetectorID); err != nil {
-			return util.HandleError("insertAncestryFeatures", commonerr.CombineErrors(err, stmt.Close()))
-		}
-	}
-
-	return nil
-}
--- a/database/pgsql/ancestry/ancestry_layer.go
+++ b/database/pgsql/ancestry/ancestry_layer.go
@ -1,131 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ancestry
-
-import (
-	"database/sql"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/detector"
-	"github.com/coreos/clair/database/pgsql/util"
-	"github.com/coreos/clair/pkg/commonerr"
-	log "github.com/sirupsen/logrus"
-)
-
-const (
-	findAncestryLayerHashes = `
-	SELECT layer.hash, ancestry_layer.ancestry_index
-	FROM layer, ancestry_layer
-	WHERE ancestry_layer.ancestry_id = $1
-		AND ancestry_layer.layer_id = layer.id
-	ORDER BY ancestry_layer.ancestry_index ASC`
-	insertAncestryLayers = `
-	INSERT INTO ancestry_layer (ancestry_id, ancestry_index, layer_id) VALUES ($1, $2, $3)
-	RETURNING id`
-)
-
-func FindAncestryLayerHashes(tx *sql.Tx, ancestryID int64) (map[int64]string, error) {
-	// retrieve layer indexes and hashes
-	rows, err := tx.Query(findAncestryLayerHashes, ancestryID)
-	if err != nil {
-		return nil, util.HandleError("findAncestryLayerHashes", err)
-	}
-
-	layerHashes := map[int64]string{}
-	for rows.Next() {
-		var (
-			hash  string
-			index int64
-		)
-
-		if err = rows.Scan(&hash, &index); err != nil {
-			return nil, util.HandleError("findAncestryLayerHashes", err)
-		}
-
-		if _, ok := layerHashes[index]; ok {
-			// one ancestry index should correspond to only one layer
-			return nil, database.ErrInconsistent
-		}
-
-		layerHashes[index] = hash
-	}
-
-	return layerHashes, nil
-}
-
-// insertAncestryLayers inserts the ancestry layers along with its content into
-// the database. The layers are 0 based indexed in the original order.
-func InsertAncestryLayers(tx *sql.Tx, ancestryID int64, layers []int64) ([]int64, error) {
-	stmt, err := tx.Prepare(insertAncestryLayers)
-	if err != nil {
-		return nil, util.HandleError("insertAncestryLayers", err)
-	}
-
-	ancestryLayerIDs := []int64{}
-	for index, layerID := range layers {
-		var ancestryLayerID sql.NullInt64
-		if err := stmt.QueryRow(ancestryID, index, layerID).Scan(&ancestryLayerID); err != nil {
-			return nil, util.HandleError("insertAncestryLayers", commonerr.CombineErrors(err, stmt.Close()))
-		}
-
-		if !ancestryLayerID.Valid {
-			return nil, database.ErrInconsistent
-		}
-
-		ancestryLayerIDs = append(ancestryLayerIDs, ancestryLayerID.Int64)
-	}
-
-	if err := stmt.Close(); err != nil {
-		return nil, util.HandleError("insertAncestryLayers", err)
-	}
-
-	return ancestryLayerIDs, nil
-}
-
-func FindAncestryLayers(tx *sql.Tx, id int64) ([]database.AncestryLayer, error) {
-	detectors, err := detector.FindAllDetectors(tx)
-	if err != nil {
-		return nil, err
-	}
-
-	layerMap, err := FindAncestryLayerHashes(tx, id)
-	if err != nil {
-		return nil, err
-	}
-
-	featureMap, err := FindAncestryFeatures(tx, id, detectors)
-	if err != nil {
-		return nil, err
-	}
-
-	layers := make([]database.AncestryLayer, len(layerMap))
-	for index, layer := range layerMap {
-		// index MUST match the ancestry layer slice index.
-		if layers[index].Hash == "" && len(layers[index].Features) == 0 {
-			layers[index] = database.AncestryLayer{
-				Hash:     layer,
-				Features: featureMap[index],
-			}
-		} else {
-			log.WithFields(log.Fields{
-				"ancestry ID":               id,
-				"duplicated ancestry index": index,
-			}).WithError(database.ErrInconsistent).Error("ancestry layers with same ancestry_index is not allowed")
-			return nil, database.ErrInconsistent
-		}
-	}
-
-	return layers, nil
-}
--- a/database/pgsql/ancestry/ancestry_test.go
+++ b/database/pgsql/ancestry/ancestry_test.go
@ -1,141 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ancestry
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/testutil"
-)
-
-var upsertAncestryTests = []struct {
-	in    *database.Ancestry
-	err   string
-	title string
-}{
-	{
-		title: "ancestry with invalid layer",
-		in: &database.Ancestry{
-			Name: "a1",
-			Layers: []database.AncestryLayer{
-				{
-					Hash: "layer-non-existing",
-				},
-			},
-		},
-		err: database.ErrMissingEntities.Error(),
-	},
-	{
-		title: "ancestry with invalid name",
-		in:    &database.Ancestry{},
-		err:   database.ErrInvalidParameters.Error(),
-	},
-	{
-		title: "new valid ancestry",
-		in: &database.Ancestry{
-			Name:   "a",
-			Layers: []database.AncestryLayer{{Hash: "layer-0"}},
-		},
-	},
-	{
-		title: "ancestry with invalid feature",
-		in: &database.Ancestry{
-			Name: "a",
-			By:   []database.Detector{testutil.RealDetectors[1], testutil.RealDetectors[2]},
-			Layers: []database.AncestryLayer{{Hash: "layer-1", Features: []database.AncestryFeature{
-				{testutil.FakeNamespacedFeatures[1], testutil.FakeDetector[1], testutil.FakeDetector[2]},
-			}}},
-		},
-		err: database.ErrMissingEntities.Error(),
-	},
-	{
-		title: "replace old ancestry",
-		in: &database.Ancestry{
-			Name: "a",
-			By:   []database.Detector{testutil.RealDetectors[1], testutil.RealDetectors[2]},
-			Layers: []database.AncestryLayer{
-				{"layer-1", []database.AncestryFeature{{testutil.RealNamespacedFeatures[1], testutil.RealDetectors[2], testutil.RealDetectors[1]}}},
-			},
-		},
-	},
-}
-
-func TestUpsertAncestry(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "TestUpsertAncestry")
-	defer cleanup()
-
-	for _, test := range upsertAncestryTests {
-		t.Run(test.title, func(t *testing.T) {
-			err := UpsertAncestry(tx, *test.in)
-			if test.err != "" {
-				assert.EqualError(t, err, test.err, "unexpected error")
-				return
-			}
-			assert.Nil(t, err)
-			actual, ok, err := FindAncestry(tx, test.in.Name)
-			assert.Nil(t, err)
-			assert.True(t, ok)
-			database.AssertAncestryEqual(t, test.in, &actual)
-		})
-	}
-}
-
-var findAncestryTests = []struct {
-	title string
-	in    string
-
-	ancestry *database.Ancestry
-	err      string
-	ok       bool
-}{
-	{
-		title:    "missing ancestry",
-		in:       "ancestry-non",
-		err:      "",
-		ancestry: nil,
-		ok:       false,
-	},
-	{
-		title:    "valid ancestry",
-		in:       "ancestry-2",
-		err:      "",
-		ok:       true,
-		ancestry: testutil.TakeAncestryPointerFromMap(testutil.RealAncestries, 2),
-	},
-}
-
-func TestFindAncestry(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "TestFindAncestry")
-	defer cleanup()
-
-	for _, test := range findAncestryTests {
-		t.Run(test.title, func(t *testing.T) {
-			ancestry, ok, err := FindAncestry(tx, test.in)
-			if test.err != "" {
-				assert.EqualError(t, err, test.err, "unexpected error")
-				return
-			}
-
-			assert.Nil(t, err)
-			assert.Equal(t, test.ok, ok)
-			if test.ok {
-				database.AssertAncestryEqual(t, test.ancestry, &ancestry)
-			}
-		})
-	}
-}
--- a/database/pgsql/ancestry_test.go
+++ b/database/pgsql/ancestry_test.go
@ -0,0 +1,207 @@
+// Copyright 2017 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"sort"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/coreos/clair/database"
+)
+
+func TestUpsertAncestry(t *testing.T) {
+	store, tx := openSessionForTest(t, "UpsertAncestry", true)
+	defer closeTest(t, store, tx)
+	a1 := database.Ancestry{
+		Name: "a1",
+		Layers: []database.Layer{
+			{Hash: "layer-N"},
+		},
+	}
+
+	a2 := database.Ancestry{}
+
+	a3 := database.Ancestry{
+		Name: "a",
+		Layers: []database.Layer{
+			{Hash: "layer-0"},
+		},
+	}
+
+	a4 := database.Ancestry{
+		Name: "a",
+		Layers: []database.Layer{
+			{Hash: "layer-1"},
+		},
+	}
+
+	f1 := database.Feature{
+		Name:          "wechat",
+		Version:       "0.5",
+		VersionFormat: "dpkg",
+	}
+
+	// not in database
+	f2 := database.Feature{
+		Name:          "wechat",
+		Version:       "0.6",
+		VersionFormat: "dpkg",
+	}
+
+	n1 := database.Namespace{
+		Name:          "debian:7",
+		VersionFormat: "dpkg",
+	}
+
+	p := database.Processors{
+		Listers:   []string{"dpkg", "non-existing"},
+		Detectors: []string{"os-release", "non-existing"},
+	}
+
+	nsf1 := database.NamespacedFeature{
+		Namespace: n1,
+		Feature:   f1,
+	}
+
+	// not in database
+	nsf2 := database.NamespacedFeature{
+		Namespace: n1,
+		Feature:   f2,
+	}
+
+	// invalid case
+	assert.NotNil(t, tx.UpsertAncestry(a1, nil, database.Processors{}))
+	assert.NotNil(t, tx.UpsertAncestry(a2, nil, database.Processors{}))
+	// valid case
+	assert.Nil(t, tx.UpsertAncestry(a3, nil, database.Processors{}))
+	// replace invalid case
+	assert.NotNil(t, tx.UpsertAncestry(a4, []database.NamespacedFeature{nsf1, nsf2}, p))
+	// replace valid case
+	assert.Nil(t, tx.UpsertAncestry(a4, []database.NamespacedFeature{nsf1}, p))
+	// validate
+	ancestry, ok, err := tx.FindAncestryFeatures("a")
+	assert.Nil(t, err)
+	assert.True(t, ok)
+	assert.Equal(t, a4, ancestry.Ancestry)
+}
+
+func assertProcessorsEqual(t *testing.T, expected database.Processors, actual database.Processors) bool {
+	sort.Strings(expected.Detectors)
+	sort.Strings(actual.Detectors)
+	sort.Strings(expected.Listers)
+	sort.Strings(actual.Listers)
+	return assert.Equal(t, expected.Detectors, actual.Detectors) && assert.Equal(t, expected.Listers, actual.Listers)
+}
+
+func TestFindAncestry(t *testing.T) {
+	store, tx := openSessionForTest(t, "FindAncestry", true)
+	defer closeTest(t, store, tx)
+
+	// not found
+	_, _, ok, err := tx.FindAncestry("ancestry-non")
+	assert.Nil(t, err)
+	assert.False(t, ok)
+
+	expected := database.Ancestry{
+		Name: "ancestry-1",
+		Layers: []database.Layer{
+			{Hash: "layer-0"},
+			{Hash: "layer-1"},
+			{Hash: "layer-2"},
+			{Hash: "layer-3a"},
+		},
+	}
+
+	expectedProcessors := database.Processors{
+		Detectors: []string{"os-release"},
+		Listers:   []string{"dpkg"},
+	}
+
+	// found
+	a, p, ok2, err := tx.FindAncestry("ancestry-1")
+	if assert.Nil(t, err) && assert.True(t, ok2) {
+		assertAncestryEqual(t, expected, a)
+		assertProcessorsEqual(t, expectedProcessors, p)
+	}
+}
+
+func assertAncestryWithFeatureEqual(t *testing.T, expected database.AncestryWithFeatures, actual database.AncestryWithFeatures) bool {
+	return assertAncestryEqual(t, expected.Ancestry, actual.Ancestry) &&
+		assertNamespacedFeatureEqual(t, expected.Features, actual.Features) &&
+		assertProcessorsEqual(t, expected.ProcessedBy, actual.ProcessedBy)
+}
+func assertAncestryEqual(t *testing.T, expected database.Ancestry, actual database.Ancestry) bool {
+	return assert.Equal(t, expected.Name, actual.Name) && assert.Equal(t, expected.Layers, actual.Layers)
+}
+
+func TestFindAncestryFeatures(t *testing.T) {
+	store, tx := openSessionForTest(t, "FindAncestryFeatures", true)
+	defer closeTest(t, store, tx)
+
+	// invalid
+	_, ok, err := tx.FindAncestryFeatures("ancestry-non")
+	if assert.Nil(t, err) {
+		assert.False(t, ok)
+	}
+
+	expected := database.AncestryWithFeatures{
+		Ancestry: database.Ancestry{
+			Name: "ancestry-2",
+			Layers: []database.Layer{
+				{Hash: "layer-0"},
+				{Hash: "layer-1"},
+				{Hash: "layer-2"},
+				{Hash: "layer-3b"},
+			},
+		},
+		ProcessedBy: database.Processors{
+			Detectors: []string{"os-release"},
+			Listers:   []string{"dpkg"},
+		},
+		Features: []database.NamespacedFeature{
+			{
+				Namespace: database.Namespace{
+					Name:          "debian:7",
+					VersionFormat: "dpkg",
+				},
+				Feature: database.Feature{
+					Name:          "wechat",
+					Version:       "0.5",
+					VersionFormat: "dpkg",
+				},
+			},
+			{
+				Namespace: database.Namespace{
+					Name:          "debian:8",
+					VersionFormat: "dpkg",
+				},
+				Feature: database.Feature{
+					Name:          "openssl",
+					Version:       "1.0",
+					VersionFormat: "dpkg",
+				},
+			},
+		},
+	}
+	// valid
+	ancestry, ok, err := tx.FindAncestryFeatures("ancestry-2")
+	if assert.Nil(t, err) && assert.True(t, ok) {
+		assertAncestryEqual(t, expected.Ancestry, ancestry.Ancestry)
+		assertNamespacedFeatureEqual(t, expected.Features, ancestry.Features)
+		assertProcessorsEqual(t, expected.ProcessedBy, ancestry.ProcessedBy)
+	}
+}
--- a/database/pgsql/complex_test.go
+++ b/database/pgsql/complex_test.go
@ -0,0 +1,226 @@
+// Copyright 2017 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"fmt"
+	"math/rand"
+	"runtime"
+	"strconv"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/pborman/uuid"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/coreos/clair/database"
+	"github.com/coreos/clair/ext/versionfmt"
+	"github.com/coreos/clair/ext/versionfmt/dpkg"
+	"github.com/coreos/clair/pkg/strutil"
+)
+
+const (
+	numVulnerabilities = 100
+	numFeatures        = 100
+)
+
+func testGenRandomVulnerabilityAndNamespacedFeature(t *testing.T, store database.Datastore) ([]database.NamespacedFeature, []database.VulnerabilityWithAffected) {
+	tx, err := store.Begin()
+	if !assert.Nil(t, err) {
+		t.FailNow()
+	}
+
+	featureName := "TestFeature"
+	featureVersionFormat := dpkg.ParserName
+	// Insert the namespace on which we'll work.
+	namespace := database.Namespace{
+		Name:          "TestRaceAffectsFeatureNamespace1",
+		VersionFormat: dpkg.ParserName,
+	}
+
+	if !assert.Nil(t, tx.PersistNamespaces([]database.Namespace{namespace})) {
+		t.FailNow()
+	}
+
+	// Initialize random generator and enforce max procs.
+	rand.Seed(time.Now().UnixNano())
+	runtime.GOMAXPROCS(runtime.NumCPU())
+
+	// Generate Distinct random features
+	features := make([]database.Feature, numFeatures)
+	nsFeatures := make([]database.NamespacedFeature, numFeatures)
+	for i := 0; i < numFeatures; i++ {
+		version := rand.Intn(numFeatures)
+
+		features[i] = database.Feature{
+			Name:          featureName,
+			VersionFormat: featureVersionFormat,
+			Version:       strconv.Itoa(version),
+		}
+
+		nsFeatures[i] = database.NamespacedFeature{
+			Namespace: namespace,
+			Feature:   features[i],
+		}
+	}
+
+	// insert features
+	if !assert.Nil(t, tx.PersistFeatures(features)) {
+		t.FailNow()
+	}
+
+	// Generate vulnerabilities.
+	vulnerabilities := []database.VulnerabilityWithAffected{}
+	for i := 0; i < numVulnerabilities; i++ {
+		// any version less than this is vulnerable
+		version := rand.Intn(numFeatures) + 1
+
+		vulnerability := database.VulnerabilityWithAffected{
+			Vulnerability: database.Vulnerability{
+				Name:      uuid.New(),
+				Namespace: namespace,
+				Severity:  database.UnknownSeverity,
+			},
+			Affected: []database.AffectedFeature{
+				{
+					Namespace:       namespace,
+					FeatureName:     featureName,
+					AffectedVersion: strconv.Itoa(version),
+					FixedInVersion:  strconv.Itoa(version),
+				},
+			},
+		}
+
+		vulnerabilities = append(vulnerabilities, vulnerability)
+	}
+	tx.Commit()
+
+	return nsFeatures, vulnerabilities
+}
+
+func TestConcurrency(t *testing.T) {
+	store, err := openDatabaseForTest("Concurrency", false)
+	if !assert.Nil(t, err) {
+		t.FailNow()
+	}
+	defer store.Close()
+
+	start := time.Now()
+	var wg sync.WaitGroup
+	wg.Add(100)
+	for i := 0; i < 100; i++ {
+		go func() {
+			defer wg.Done()
+			nsNamespaces := genRandomNamespaces(t, 100)
+			tx, err := store.Begin()
+			if !assert.Nil(t, err) {
+				t.FailNow()
+			}
+			assert.Nil(t, tx.PersistNamespaces(nsNamespaces))
+			tx.Commit()
+		}()
+	}
+	wg.Wait()
+	fmt.Println("total", time.Since(start))
+}
+
+func genRandomNamespaces(t *testing.T, count int) []database.Namespace {
+	r := make([]database.Namespace, count)
+	for i := 0; i < count; i++ {
+		r[i] = database.Namespace{
+			Name:          uuid.New(),
+			VersionFormat: "dpkg",
+		}
+	}
+	return r
+}
+
+func TestCaching(t *testing.T) {
+	store, err := openDatabaseForTest("Caching", false)
+	if !assert.Nil(t, err) {
+		t.FailNow()
+	}
+	defer store.Close()
+
+	nsFeatures, vulnerabilities := testGenRandomVulnerabilityAndNamespacedFeature(t, store)
+
+	fmt.Printf("%d features, %d vulnerabilities are generated", len(nsFeatures), len(vulnerabilities))
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	go func() {
+		defer wg.Done()
+		tx, err := store.Begin()
+		if !assert.Nil(t, err) {
+			t.FailNow()
+		}
+
+		assert.Nil(t, tx.PersistNamespacedFeatures(nsFeatures))
+		fmt.Println("finished to insert namespaced features")
+
+		tx.Commit()
+	}()
+
+	go func() {
+		defer wg.Done()
+		tx, err := store.Begin()
+		if !assert.Nil(t, err) {
+			t.FailNow()
+		}
+
+		assert.Nil(t, tx.InsertVulnerabilities(vulnerabilities))
+		fmt.Println("finished to insert vulnerabilities")
+		tx.Commit()
+
+	}()
+
+	wg.Wait()
+
+	tx, err := store.Begin()
+	if !assert.Nil(t, err) {
+		t.FailNow()
+	}
+	defer tx.Rollback()
+
+	// Verify consistency now.
+	affected, err := tx.FindAffectedNamespacedFeatures(nsFeatures)
+	if !assert.Nil(t, err) {
+		t.FailNow()
+	}
+
+	for _, ansf := range affected {
+		if !assert.True(t, ansf.Valid) {
+			t.FailNow()
+		}
+
+		expectedAffectedNames := []string{}
+		for _, vuln := range vulnerabilities {
+			if ok, err := versionfmt.InRange(dpkg.ParserName, ansf.Version, vuln.Affected[0].AffectedVersion); err == nil {
+				if ok {
+					expectedAffectedNames = append(expectedAffectedNames, vuln.Name)
+				}
+			}
+		}
+
+		actualAffectedNames := []string{}
+		for _, s := range ansf.AffectedBy {
+			actualAffectedNames = append(actualAffectedNames, s.Name)
+		}
+
+		assert.Len(t, strutil.CompareStringLists(expectedAffectedNames, actualAffectedNames), 0)
+		assert.Len(t, strutil.CompareStringLists(actualAffectedNames, expectedAffectedNames), 0)
+	}
+}
--- a/database/pgsql/detector/detector.go
+++ b/database/pgsql/detector/detector.go
@ -1,132 +0,0 @@
-// Copyright 2018 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package detector
-
-import (
-	"database/sql"
-
-	log "github.com/sirupsen/logrus"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/util"
-)
-
-const (
-	soiDetector = `
-		INSERT INTO detector (name, version, dtype)
-			SELECT CAST ($1 AS TEXT), CAST ($2 AS TEXT), CAST ($3 AS detector_type )
-			WHERE NOT EXISTS (SELECT id FROM detector WHERE name = $1 AND version = $2 AND dtype = $3);`
-
-	findDetectorID   = `SELECT id FROM detector WHERE name = $1 AND version = $2 AND dtype = $3`
-	findAllDetectors = `SELECT id, name, version, dtype FROM detector`
-)
-
-type DetectorMap struct {
-	ByID    map[int64]database.Detector
-	ByValue map[database.Detector]int64
-}
-
-func PersistDetectors(tx *sql.Tx, detectors []database.Detector) error {
-	for _, d := range detectors {
-		if !d.Valid() {
-			log.WithField("detector", d).Debug("Invalid Detector")
-			return database.ErrInvalidParameters
-		}
-
-		r, err := tx.Exec(soiDetector, d.Name, d.Version, d.DType)
-		if err != nil {
-			return util.HandleError("soiDetector", err)
-		}
-
-		count, err := r.RowsAffected()
-		if err != nil {
-			return util.HandleError("soiDetector", err)
-		}
-
-		if count == 0 {
-			log.Debug("detector already exists: ", d)
-		}
-	}
-
-	return nil
-}
-
-// findDetectorIDs retrieve ids of the detectors from the database, if any is not
-// found, return the error.
-func FindDetectorIDs(tx *sql.Tx, detectors []database.Detector) ([]int64, error) {
-	ids := []int64{}
-	for _, d := range detectors {
-		id := sql.NullInt64{}
-		err := tx.QueryRow(findDetectorID, d.Name, d.Version, d.DType).Scan(&id)
-		if err != nil {
-			return nil, util.HandleError("findDetectorID", err)
-		}
-
-		if !id.Valid {
-			return nil, database.ErrInconsistent
-		}
-
-		ids = append(ids, id.Int64)
-	}
-
-	return ids, nil
-}
-
-func GetDetectors(tx *sql.Tx, query string, id int64) ([]database.Detector, error) {
-	rows, err := tx.Query(query, id)
-	if err != nil {
-		return nil, util.HandleError("getDetectors", err)
-	}
-
-	detectors := []database.Detector{}
-	for rows.Next() {
-		d := database.Detector{}
-		err := rows.Scan(&d.Name, &d.Version, &d.DType)
-		if err != nil {
-			return nil, util.HandleError("getDetectors", err)
-		}
-
-		if !d.Valid() {
-			return nil, database.ErrInvalidDetector
-		}
-
-		detectors = append(detectors, d)
-	}
-
-	return detectors, nil
-}
-
-func FindAllDetectors(tx *sql.Tx) (DetectorMap, error) {
-	rows, err := tx.Query(findAllDetectors)
-	if err != nil {
-		return DetectorMap{}, util.HandleError("searchAllDetectors", err)
-	}
-
-	detectors := DetectorMap{ByID: make(map[int64]database.Detector), ByValue: make(map[database.Detector]int64)}
-	for rows.Next() {
-		var (
-			id int64
-			d  database.Detector
-		)
-		if err := rows.Scan(&id, &d.Name, &d.Version, &d.DType); err != nil {
-			return DetectorMap{}, util.HandleError("searchAllDetectors", err)
-		}
-
-		detectors.ByID[id] = d
-		detectors.ByValue[d] = id
-	}
-
-	return detectors, nil
-}
--- a/database/pgsql/detector/detector_test.go
+++ b/database/pgsql/detector/detector_test.go
@ -1,121 +0,0 @@
-// Copyright 2018 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package detector
-
-import (
-	"database/sql"
-	"testing"
-
-	"github.com/deckarep/golang-set"
-	"github.com/stretchr/testify/require"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/testutil"
-)
-
-func testGetAllDetectors(tx *sql.Tx) []database.Detector {
-	query := `SELECT name, version, dtype FROM detector`
-	rows, err := tx.Query(query)
-	if err != nil {
-		panic(err)
-	}
-
-	detectors := []database.Detector{}
-	for rows.Next() {
-		d := database.Detector{}
-		if err := rows.Scan(&d.Name, &d.Version, &d.DType); err != nil {
-			panic(err)
-		}
-
-		detectors = append(detectors, d)
-	}
-
-	return detectors
-}
-
-var persistDetectorTests = []struct {
-	title string
-	in    []database.Detector
-	err   string
-}{
-	{
-		title: "invalid detector",
-		in: []database.Detector{
-			{},
-			database.NewFeatureDetector("name", "2.0"),
-		},
-		err: database.ErrInvalidParameters.Error(),
-	},
-	{
-		title: "invalid detector 2",
-		in: []database.Detector{
-			database.NewFeatureDetector("name", "2.0"),
-			{"name", "1.0", "random not valid dtype"},
-		},
-		err: database.ErrInvalidParameters.Error(),
-	},
-	{
-		title: "detectors with some different fields",
-		in: []database.Detector{
-			database.NewFeatureDetector("name", "2.0"),
-			database.NewFeatureDetector("name", "1.0"),
-			database.NewNamespaceDetector("name", "1.0"),
-		},
-	},
-	{
-		title: "duplicated detectors (parameter level)",
-		in: []database.Detector{
-			database.NewFeatureDetector("name", "1.0"),
-			database.NewFeatureDetector("name", "1.0"),
-		},
-	},
-	{
-		title: "duplicated detectors (db level)",
-		in: []database.Detector{
-			database.NewNamespaceDetector("os-release", "1.0"),
-			database.NewNamespaceDetector("os-release", "1.0"),
-			database.NewFeatureDetector("dpkg", "1.0"),
-		},
-	},
-}
-
-func TestPersistDetector(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "PersistDetector")
-	defer cleanup()
-
-	for _, test := range persistDetectorTests {
-		t.Run(test.title, func(t *testing.T) {
-			err := PersistDetectors(tx, test.in)
-			if test.err != "" {
-				require.EqualError(t, err, test.err)
-				return
-			}
-
-			detectors := testGetAllDetectors(tx)
-
-			// ensure no duplicated detectors
-			detectorSet := mapset.NewSet()
-			for _, d := range detectors {
-				require.False(t, detectorSet.Contains(d), "duplicated: %v", d)
-				detectorSet.Add(d)
-			}
-
-			// ensure all persisted detectors are actually saved
-			for _, d := range test.in {
-				require.True(t, detectorSet.Contains(d), "detector: %v, detectors: %v", d, detectorSet)
-			}
-		})
-	}
-}
--- a/database/pgsql/feature.go
+++ b/database/pgsql/feature.go
@ -0,0 +1,381 @@
+// Copyright 2017 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"database/sql"
+	"errors"
+	"sort"
+
+	"github.com/lib/pq"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/coreos/clair/database"
+	"github.com/coreos/clair/ext/versionfmt"
+	"github.com/coreos/clair/pkg/commonerr"
+)
+
+var (
+	errFeatureNotFound = errors.New("Feature not found")
+)
+
+type vulnerabilityAffecting struct {
+	vulnerabilityID int64
+	addedByID       int64
+}
+
+func (tx *pgSession) PersistFeatures(features []database.Feature) error {
+	if len(features) == 0 {
+		return nil
+	}
+
+	// Sorting is needed before inserting into database to prevent deadlock.
+	sort.Slice(features, func(i, j int) bool {
+		return features[i].Name < features[j].Name ||
+			features[i].Version < features[j].Version ||
+			features[i].VersionFormat < features[j].VersionFormat
+	})
+
+	// TODO(Sida): A better interface for bulk insertion is needed.
+	keys := make([]interface{}, len(features)*3)
+	for i, f := range features {
+		keys[i*3] = f.Name
+		keys[i*3+1] = f.Version
+		keys[i*3+2] = f.VersionFormat
+		if f.Name == "" || f.Version == "" || f.VersionFormat == "" {
+			return commonerr.NewBadRequestError("Empty feature name, version or version format is not allowed")
+		}
+	}
+
+	_, err := tx.Exec(queryPersistFeature(len(features)), keys...)
+	return handleError("queryPersistFeature", err)
+}
+
+type namespacedFeatureWithID struct {
+	database.NamespacedFeature
+
+	ID int64
+}
+
+type vulnerabilityCache struct {
+	nsFeatureID     int64
+	vulnID          int64
+	vulnAffectingID int64
+}
+
+func (tx *pgSession) searchAffectingVulnerabilities(features []database.NamespacedFeature) ([]vulnerabilityCache, error) {
+	if len(features) == 0 {
+		return nil, nil
+	}
+
+	ids, err := tx.findNamespacedFeatureIDs(features)
+	if err != nil {
+		return nil, err
+	}
+
+	fMap := map[int64]database.NamespacedFeature{}
+	for i, f := range features {
+		if !ids[i].Valid {
+			return nil, errFeatureNotFound
+		}
+		fMap[ids[i].Int64] = f
+	}
+
+	cacheTable := []vulnerabilityCache{}
+	rows, err := tx.Query(searchPotentialAffectingVulneraibilities, pq.Array(ids))
+	if err != nil {
+		return nil, handleError("searchPotentialAffectingVulneraibilities", err)
+	}
+
+	defer rows.Close()
+	for rows.Next() {
+		var (
+			cache    vulnerabilityCache
+			affected string
+		)
+
+		err := rows.Scan(&cache.nsFeatureID, &cache.vulnID, &affected, &cache.vulnAffectingID)
+		if err != nil {
+			return nil, err
+		}
+
+		if ok, err := versionfmt.InRange(fMap[cache.nsFeatureID].VersionFormat, fMap[cache.nsFeatureID].Version, affected); err != nil {
+			return nil, err
+		} else if ok {
+			cacheTable = append(cacheTable, cache)
+		}
+	}
+
+	return cacheTable, nil
+}
+
+func (tx *pgSession) CacheAffectedNamespacedFeatures(features []database.NamespacedFeature) error {
+	if len(features) == 0 {
+		return nil
+	}
+
+	_, err := tx.Exec(lockVulnerabilityAffects)
+	if err != nil {
+		return handleError("lockVulnerabilityAffects", err)
+	}
+
+	cache, err := tx.searchAffectingVulnerabilities(features)
+
+	keys := make([]interface{}, len(cache)*3)
+	for i, c := range cache {
+		keys[i*3] = c.vulnID
+		keys[i*3+1] = c.nsFeatureID
+		keys[i*3+2] = c.vulnAffectingID
+	}
+
+	if len(cache) == 0 {
+		return nil
+	}
+
+	affected, err := tx.Exec(queryPersistVulnerabilityAffectedNamespacedFeature(len(cache)), keys...)
+	if err != nil {
+		return handleError("persistVulnerabilityAffectedNamespacedFeature", err)
+	}
+	if count, err := affected.RowsAffected(); err != nil {
+		log.Debugf("Cached %d features in vulnerability_affected_namespaced_feature", count)
+	}
+	return nil
+}
+
+func (tx *pgSession) PersistNamespacedFeatures(features []database.NamespacedFeature) error {
+	if len(features) == 0 {
+		return nil
+	}
+
+	nsIDs := map[database.Namespace]sql.NullInt64{}
+	fIDs := map[database.Feature]sql.NullInt64{}
+	for _, f := range features {
+		nsIDs[f.Namespace] = sql.NullInt64{}
+		fIDs[f.Feature] = sql.NullInt64{}
+	}
+
+	fToFind := []database.Feature{}
+	for f := range fIDs {
+		fToFind = append(fToFind, f)
+	}
+
+	sort.Slice(fToFind, func(i, j int) bool {
+		return fToFind[i].Name < fToFind[j].Name ||
+			fToFind[i].Version < fToFind[j].Version ||
+			fToFind[i].VersionFormat < fToFind[j].VersionFormat
+	})
+
+	if ids, err := tx.findFeatureIDs(fToFind); err == nil {
+		for i, id := range ids {
+			if !id.Valid {
+				return errFeatureNotFound
+			}
+			fIDs[fToFind[i]] = id
+		}
+	} else {
+		return err
+	}
+
+	nsToFind := []database.Namespace{}
+	for ns := range nsIDs {
+		nsToFind = append(nsToFind, ns)
+	}
+
+	if ids, err := tx.findNamespaceIDs(nsToFind); err == nil {
+		for i, id := range ids {
+			if !id.Valid {
+				return errNamespaceNotFound
+			}
+			nsIDs[nsToFind[i]] = id
+		}
+	} else {
+		return err
+	}
+
+	keys := make([]interface{}, len(features)*2)
+	for i, f := range features {
+		keys[i*2] = fIDs[f.Feature]
+		keys[i*2+1] = nsIDs[f.Namespace]
+	}
+
+	_, err := tx.Exec(queryPersistNamespacedFeature(len(features)), keys...)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// FindAffectedNamespacedFeatures looks up cache table and retrieves all
+// vulnerabilities associated with the features.
+func (tx *pgSession) FindAffectedNamespacedFeatures(features []database.NamespacedFeature) ([]database.NullableAffectedNamespacedFeature, error) {
+	if len(features) == 0 {
+		return nil, nil
+	}
+
+	returnFeatures := make([]database.NullableAffectedNamespacedFeature, len(features))
+
+	// featureMap is used to keep track of duplicated features.
+	featureMap := map[database.NamespacedFeature][]*database.NullableAffectedNamespacedFeature{}
+	// initialize return value and generate unique feature request queries.
+	for i, f := range features {
+		returnFeatures[i] = database.NullableAffectedNamespacedFeature{
+			AffectedNamespacedFeature: database.AffectedNamespacedFeature{
+				NamespacedFeature: f,
+			},
+		}
+
+		featureMap[f] = append(featureMap[f], &returnFeatures[i])
+	}
+
+	// query unique namespaced features
+	distinctFeatures := []database.NamespacedFeature{}
+	for f := range featureMap {
+		distinctFeatures = append(distinctFeatures, f)
+	}
+
+	nsFeatureIDs, err := tx.findNamespacedFeatureIDs(distinctFeatures)
+	if err != nil {
+		return nil, err
+	}
+
+	toQuery := []int64{}
+	featureIDMap := map[int64][]*database.NullableAffectedNamespacedFeature{}
+	for i, id := range nsFeatureIDs {
+		if id.Valid {
+			toQuery = append(toQuery, id.Int64)
+			for _, f := range featureMap[distinctFeatures[i]] {
+				f.Valid = id.Valid
+				featureIDMap[id.Int64] = append(featureIDMap[id.Int64], f)
+			}
+		}
+	}
+
+	rows, err := tx.Query(searchNamespacedFeaturesVulnerabilities, pq.Array(toQuery))
+	if err != nil {
+		return nil, handleError("searchNamespacedFeaturesVulnerabilities", err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var (
+			featureID int64
+			vuln      database.VulnerabilityWithFixedIn
+		)
+		err := rows.Scan(&featureID,
+			&vuln.Name,
+			&vuln.Description,
+			&vuln.Link,
+			&vuln.Severity,
+			&vuln.Metadata,
+			&vuln.FixedInVersion,
+			&vuln.Namespace.Name,
+			&vuln.Namespace.VersionFormat,
+		)
+		if err != nil {
+			return nil, handleError("searchNamespacedFeaturesVulnerabilities", err)
+		}
+
+		for _, f := range featureIDMap[featureID] {
+			f.AffectedBy = append(f.AffectedBy, vuln)
+		}
+	}
+
+	return returnFeatures, nil
+}
+
+func (tx *pgSession) findNamespacedFeatureIDs(nfs []database.NamespacedFeature) ([]sql.NullInt64, error) {
+	if len(nfs) == 0 {
+		return nil, nil
+	}
+
+	nfsMap := map[database.NamespacedFeature]sql.NullInt64{}
+	keys := make([]interface{}, len(nfs)*4)
+	for i, nf := range nfs {
+		keys[i*4] = nfs[i].Name
+		keys[i*4+1] = nfs[i].Version
+		keys[i*4+2] = nfs[i].VersionFormat
+		keys[i*4+3] = nfs[i].Namespace.Name
+		nfsMap[nf] = sql.NullInt64{}
+	}
+
+	rows, err := tx.Query(querySearchNamespacedFeature(len(nfs)), keys...)
+	if err != nil {
+		return nil, handleError("searchNamespacedFeature", err)
+	}
+
+	defer rows.Close()
+	var (
+		id sql.NullInt64
+		nf database.NamespacedFeature
+	)
+
+	for rows.Next() {
+		err := rows.Scan(&id, &nf.Name, &nf.Version, &nf.VersionFormat, &nf.Namespace.Name)
+		nf.Namespace.VersionFormat = nf.VersionFormat
+		if err != nil {
+			return nil, handleError("searchNamespacedFeature", err)
+		}
+		nfsMap[nf] = id
+	}
+
+	ids := make([]sql.NullInt64, len(nfs))
+	for i, nf := range nfs {
+		ids[i] = nfsMap[nf]
+	}
+
+	return ids, nil
+}
+
+func (tx *pgSession) findFeatureIDs(fs []database.Feature) ([]sql.NullInt64, error) {
+	if len(fs) == 0 {
+		return nil, nil
+	}
+
+	fMap := map[database.Feature]sql.NullInt64{}
+
+	keys := make([]interface{}, len(fs)*3)
+	for i, f := range fs {
+		keys[i*3] = f.Name
+		keys[i*3+1] = f.Version
+		keys[i*3+2] = f.VersionFormat
+		fMap[f] = sql.NullInt64{}
+	}
+
+	rows, err := tx.Query(querySearchFeatureID(len(fs)), keys...)
+	if err != nil {
+		return nil, handleError("querySearchFeatureID", err)
+	}
+	defer rows.Close()
+
+	var (
+		id sql.NullInt64
+		f  database.Feature
+	)
+	for rows.Next() {
+		err := rows.Scan(&id, &f.Name, &f.Version, &f.VersionFormat)
+		if err != nil {
+			return nil, handleError("querySearchFeatureID", err)
+		}
+		fMap[f] = id
+	}
+
+	ids := make([]sql.NullInt64, len(fs))
+	for i, f := range fs {
+		ids[i] = fMap[f]
+	}
+
+	return ids, nil
+}
--- a/database/pgsql/feature/feature.go
+++ b/database/pgsql/feature/feature.go
@ -1,121 +0,0 @@
-// Copyright 2017 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package feature
-
-import (
-	"database/sql"
-	"fmt"
-	"sort"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/util"
-	"github.com/coreos/clair/pkg/commonerr"
-)
-
-func queryPersistFeature(count int) string {
-	return util.QueryPersist(count,
-		"feature",
-		"feature_name_version_version_format_type_key",
-		"name",
-		"version",
-		"version_format",
-		"type")
-}
-
-func querySearchFeatureID(featureCount int) string {
-	return fmt.Sprintf(`
-		SELECT id, name, version, version_format, type
-		FROM Feature WHERE (name, version, version_format, type) IN (%s)`,
-		util.QueryString(4, featureCount),
-	)
-}
-
-func PersistFeatures(tx *sql.Tx, features []database.Feature) error {
-	if len(features) == 0 {
-		return nil
-	}
-
-	types, err := GetFeatureTypeMap(tx)
-	if err != nil {
-		return err
-	}
-
-	// Sorting is needed before inserting into database to prevent deadlock.
-	sort.Slice(features, func(i, j int) bool {
-		return features[i].Name < features[j].Name ||
-			features[i].Version < features[j].Version ||
-			features[i].VersionFormat < features[j].VersionFormat
-	})
-
-	// TODO(Sida): A better interface for bulk insertion is needed.
-	keys := make([]interface{}, 0, len(features)*3)
-	for _, f := range features {
-		keys = append(keys, f.Name, f.Version, f.VersionFormat, types.ByName[f.Type])
-		if f.Name == "" || f.Version == "" || f.VersionFormat == "" {
-			return commonerr.NewBadRequestError("Empty feature name, version or version format is not allowed")
-		}
-	}
-
-	_, err = tx.Exec(queryPersistFeature(len(features)), keys...)
-	return util.HandleError("queryPersistFeature", err)
-}
-
-func FindFeatureIDs(tx *sql.Tx, fs []database.Feature) ([]sql.NullInt64, error) {
-	if len(fs) == 0 {
-		return nil, nil
-	}
-
-	types, err := GetFeatureTypeMap(tx)
-	if err != nil {
-		return nil, err
-	}
-
-	fMap := map[database.Feature]sql.NullInt64{}
-
-	keys := make([]interface{}, 0, len(fs)*4)
-	for _, f := range fs {
-		typeID := types.ByName[f.Type]
-		keys = append(keys, f.Name, f.Version, f.VersionFormat, typeID)
-		fMap[f] = sql.NullInt64{}
-	}
-
-	rows, err := tx.Query(querySearchFeatureID(len(fs)), keys...)
-	if err != nil {
-		return nil, util.HandleError("querySearchFeatureID", err)
-	}
-	defer rows.Close()
-
-	var (
-		id sql.NullInt64
-		f  database.Feature
-	)
-	for rows.Next() {
-		var typeID int
-		err := rows.Scan(&id, &f.Name, &f.Version, &f.VersionFormat, &typeID)
-		if err != nil {
-			return nil, util.HandleError("querySearchFeatureID", err)
-		}
-
-		f.Type = types.ByID[typeID]
-		fMap[f] = id
-	}
-
-	ids := make([]sql.NullInt64, len(fs))
-	for i, f := range fs {
-		ids[i] = fMap[f]
-	}
-
-	return ids, nil
-}
--- a/database/pgsql/feature/feature_test.go
+++ b/database/pgsql/feature/feature_test.go
@ -1,154 +0,0 @@
-// Copyright 2016 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package feature
-
-import (
-	"database/sql"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/testutil"
-)
-
-func TestPersistFeatures(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTx(t, "TestPersistFeatures")
-	defer cleanup()
-
-	invalid := database.Feature{}
-	valid := *database.NewBinaryPackage("mount", "2.31.1-0.4ubuntu3.1", "dpkg")
-
-	// invalid
-	require.NotNil(t, PersistFeatures(tx, []database.Feature{invalid}))
-	// existing
-	require.Nil(t, PersistFeatures(tx, []database.Feature{valid}))
-	require.Nil(t, PersistFeatures(tx, []database.Feature{valid}))
-
-	features := selectAllFeatures(t, tx)
-	assert.Equal(t, []database.Feature{valid}, features)
-}
-
-func TestPersistNamespacedFeatures(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "TestPersistNamespacedFeatures")
-	defer cleanup()
-
-	// existing features
-	f1 := database.NewSourcePackage("ourchat", "0.5", "dpkg")
-	// non-existing features
-	f2 := database.NewSourcePackage("fake!", "", "")
-	// exising namespace
-	n1 := database.NewNamespace("debian:7", "dpkg")
-	// non-existing namespace
-	n2 := database.NewNamespace("debian:non", "dpkg")
-	// existing namespaced feature
-	nf1 := database.NewNamespacedFeature(n1, f1)
-	// invalid namespaced feature
-	nf2 := database.NewNamespacedFeature(n2, f2)
-	// namespaced features with namespaces or features not in the database will
-	// generate error.
-	assert.Nil(t, PersistNamespacedFeatures(tx, []database.NamespacedFeature{}))
-	assert.NotNil(t, PersistNamespacedFeatures(tx, []database.NamespacedFeature{*nf1, *nf2}))
-	// valid case: insert nf3
-	assert.Nil(t, PersistNamespacedFeatures(tx, []database.NamespacedFeature{*nf1}))
-
-	all := listNamespacedFeatures(t, tx)
-	assert.Contains(t, all, *nf1)
-}
-
-func listNamespacedFeatures(t *testing.T, tx *sql.Tx) []database.NamespacedFeature {
-	types, err := GetFeatureTypeMap(tx)
-	if err != nil {
-		panic(err)
-	}
-
-	rows, err := tx.Query(`SELECT f.name, f.version, f.version_format, f.type, n.name, n.version_format
-	FROM feature AS f, namespace AS n, namespaced_feature AS nf
-	WHERE nf.feature_id = f.id AND nf.namespace_id = n.id`)
-	if err != nil {
-		panic(err)
-	}
-
-	nf := []database.NamespacedFeature{}
-	for rows.Next() {
-		f := database.NamespacedFeature{}
-		var typeID int
-		err := rows.Scan(&f.Name, &f.Version, &f.VersionFormat, &typeID, &f.Namespace.Name, &f.Namespace.VersionFormat)
-		if err != nil {
-			panic(err)
-		}
-
-		f.Type = types.ByID[typeID]
-		nf = append(nf, f)
-	}
-
-	return nf
-}
-
-func selectAllFeatures(t *testing.T, tx *sql.Tx) []database.Feature {
-	types, err := GetFeatureTypeMap(tx)
-	if err != nil {
-		panic(err)
-	}
-
-	rows, err := tx.Query("SELECT name, version, version_format, type FROM feature")
-	if err != nil {
-		t.FailNow()
-	}
-
-	fs := []database.Feature{}
-	for rows.Next() {
-		f := database.Feature{}
-		var typeID int
-		err := rows.Scan(&f.Name, &f.Version, &f.VersionFormat, &typeID)
-		f.Type = types.ByID[typeID]
-		if err != nil {
-			t.FailNow()
-		}
-		fs = append(fs, f)
-	}
-	return fs
-}
-
-func TestFindNamespacedFeatureIDs(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "TestFindNamespacedFeatureIDs")
-	defer cleanup()
-
-	features := []database.NamespacedFeature{}
-	expectedIDs := []int{}
-	for id, feature := range testutil.RealNamespacedFeatures {
-		features = append(features, feature)
-		expectedIDs = append(expectedIDs, id)
-	}
-
-	features = append(features, testutil.RealNamespacedFeatures[1]) // test duplicated
-	expectedIDs = append(expectedIDs, 1)
-
-	namespace := testutil.RealNamespaces[1]
-	features = append(features, *database.NewNamespacedFeature(&namespace, database.NewBinaryPackage("not-found", "1.0", "dpkg"))) // test not found feature
-
-	ids, err := FindNamespacedFeatureIDs(tx, features)
-	require.Nil(t, err)
-	require.Len(t, ids, len(expectedIDs)+1)
-	for i, id := range ids {
-		if i == len(ids)-1 {
-			require.False(t, id.Valid)
-		} else {
-			require.True(t, id.Valid)
-			require.Equal(t, expectedIDs[i], int(id.Int64))
-		}
-	}
-}
--- a/database/pgsql/feature/feature_type.go
+++ b/database/pgsql/feature/feature_type.go
@ -1,57 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package feature
-
-import (
-	"database/sql"
-
-	"github.com/coreos/clair/database"
-)
-
-const (
-	selectAllFeatureTypes = `SELECT id, name FROM feature_type`
-)
-
-type FeatureTypes struct {
-	ByID   map[int]database.FeatureType
-	ByName map[database.FeatureType]int
-}
-
-func newFeatureTypes() *FeatureTypes {
-	return &FeatureTypes{make(map[int]database.FeatureType), make(map[database.FeatureType]int)}
-}
-
-func GetFeatureTypeMap(tx *sql.Tx) (*FeatureTypes, error) {
-	rows, err := tx.Query(selectAllFeatureTypes)
-	if err != nil {
-		return nil, err
-	}
-
-	types := newFeatureTypes()
-	for rows.Next() {
-		var (
-			id   int
-			name database.FeatureType
-		)
-		if err := rows.Scan(&id, &name); err != nil {
-			return nil, err
-		}
-
-		types.ByID[id] = name
-		types.ByName[name] = id
-	}
-
-	return types, nil
-}
--- a/database/pgsql/feature/feature_type_test.go
+++ b/database/pgsql/feature/feature_type_test.go
@ -1,39 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package feature
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/require"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/testutil"
-)
-
-func TestGetFeatureTypeMap(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTx(t, "TestGetFeatureTypeMap")
-	defer cleanup()
-
-	types, err := GetFeatureTypeMap(tx)
-	if err != nil {
-		require.Nil(t, err, err.Error())
-	}
-
-	require.Equal(t, database.SourcePackage, types.ByID[1])
-	require.Equal(t, database.BinaryPackage, types.ByID[2])
-	require.Equal(t, 1, types.ByName[database.SourcePackage])
-	require.Equal(t, 2, types.ByName[database.BinaryPackage])
-}
--- a/database/pgsql/feature/namespaced_feature.go
+++ b/database/pgsql/feature/namespaced_feature.go
@ -1,168 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package feature
-
-import (
-	"database/sql"
-	"fmt"
-	"sort"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/namespace"
-	"github.com/coreos/clair/database/pgsql/util"
-)
-
-var soiNamespacedFeature = `
-WITH new_feature_ns AS (
-	INSERT INTO namespaced_feature(feature_id, namespace_id)
-	SELECT CAST ($1 AS INTEGER), CAST ($2 AS INTEGER)
-	WHERE NOT EXISTS ( SELECT id FROM namespaced_feature WHERE namespaced_feature.feature_id = $1 AND namespaced_feature.namespace_id = $2)
-	RETURNING id
-)
-SELECT id FROM namespaced_feature WHERE namespaced_feature.feature_id = $1 AND namespaced_feature.namespace_id = $2
-UNION
-SELECT id FROM new_feature_ns`
-
-func queryPersistNamespacedFeature(count int) string {
-	return util.QueryPersist(count, "namespaced_feature",
-		"namespaced_feature_namespace_id_feature_id_key",
-		"feature_id",
-		"namespace_id")
-}
-
-func querySearchNamespacedFeature(nsfCount int) string {
-	return fmt.Sprintf(`
-	SELECT nf.id, f.name, f.version, f.version_format, t.name, n.name
-		FROM namespaced_feature AS nf, feature AS f, namespace AS n, feature_type AS t
-		WHERE nf.feature_id = f.id
-			AND nf.namespace_id = n.id
-			AND n.version_format = f.version_format 
-			AND f.type = t.id
-			AND (f.name, f.version, f.version_format, t.name, n.name) IN (%s)`,
-		util.QueryString(5, nsfCount),
-	)
-}
-
-type namespacedFeatureWithID struct {
-	database.NamespacedFeature
-
-	ID int64
-}
-
-func PersistNamespacedFeatures(tx *sql.Tx, features []database.NamespacedFeature) error {
-	if len(features) == 0 {
-		return nil
-	}
-
-	nsIDs := map[database.Namespace]sql.NullInt64{}
-	fIDs := map[database.Feature]sql.NullInt64{}
-	for _, f := range features {
-		nsIDs[f.Namespace] = sql.NullInt64{}
-		fIDs[f.Feature] = sql.NullInt64{}
-	}
-
-	fToFind := []database.Feature{}
-	for f := range fIDs {
-		fToFind = append(fToFind, f)
-	}
-
-	sort.Slice(fToFind, func(i, j int) bool {
-		return fToFind[i].Name < fToFind[j].Name ||
-			fToFind[i].Version < fToFind[j].Version ||
-			fToFind[i].VersionFormat < fToFind[j].VersionFormat
-	})
-
-	if ids, err := FindFeatureIDs(tx, fToFind); err == nil {
-		for i, id := range ids {
-			if !id.Valid {
-				return database.ErrMissingEntities
-			}
-			fIDs[fToFind[i]] = id
-		}
-	} else {
-		return err
-	}
-
-	nsToFind := []database.Namespace{}
-	for ns := range nsIDs {
-		nsToFind = append(nsToFind, ns)
-	}
-
-	if ids, err := namespace.FindNamespaceIDs(tx, nsToFind); err == nil {
-		for i, id := range ids {
-			if !id.Valid {
-				return database.ErrMissingEntities
-			}
-			nsIDs[nsToFind[i]] = id
-		}
-	} else {
-		return err
-	}
-
-	keys := make([]interface{}, 0, len(features)*2)
-	for _, f := range features {
-		keys = append(keys, fIDs[f.Feature], nsIDs[f.Namespace])
-	}
-
-	_, err := tx.Exec(queryPersistNamespacedFeature(len(features)), keys...)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func FindNamespacedFeatureIDs(tx *sql.Tx, nfs []database.NamespacedFeature) ([]sql.NullInt64, error) {
-	if len(nfs) == 0 {
-		return nil, nil
-	}
-
-	nfsMap := map[database.NamespacedFeature]int64{}
-	keys := make([]interface{}, 0, len(nfs)*5)
-	for _, nf := range nfs {
-		keys = append(keys, nf.Name, nf.Version, nf.VersionFormat, nf.Type, nf.Namespace.Name)
-	}
-
-	rows, err := tx.Query(querySearchNamespacedFeature(len(nfs)), keys...)
-	if err != nil {
-		return nil, util.HandleError("searchNamespacedFeature", err)
-	}
-
-	defer rows.Close()
-	var (
-		id int64
-		nf database.NamespacedFeature
-	)
-
-	for rows.Next() {
-		err := rows.Scan(&id, &nf.Name, &nf.Version, &nf.VersionFormat, &nf.Type, &nf.Namespace.Name)
-		nf.Namespace.VersionFormat = nf.VersionFormat
-		if err != nil {
-			return nil, util.HandleError("searchNamespacedFeature", err)
-		}
-		nfsMap[nf] = id
-	}
-
-	ids := make([]sql.NullInt64, len(nfs))
-	for i, nf := range nfs {
-		if id, ok := nfsMap[nf]; ok {
-			ids[i] = sql.NullInt64{id, true}
-		} else {
-			ids[i] = sql.NullInt64{}
-		}
-	}
-
-	return ids, nil
-}
--- a/database/pgsql/feature_test.go
+++ b/database/pgsql/feature_test.go
@ -0,0 +1,256 @@
+// Copyright 2016 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/coreos/clair/database"
+
+	// register dpkg feature lister for testing
+	_ "github.com/coreos/clair/ext/featurefmt/dpkg"
+)
+
+func TestPersistFeatures(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "PersistFeatures", false)
+	defer closeTest(t, datastore, tx)
+
+	f1 := database.Feature{}
+	f2 := database.Feature{Name: "n", Version: "v", VersionFormat: "vf"}
+
+	// empty
+	assert.Nil(t, tx.PersistFeatures([]database.Feature{}))
+	// invalid
+	assert.NotNil(t, tx.PersistFeatures([]database.Feature{f1}))
+	// duplicated
+	assert.Nil(t, tx.PersistFeatures([]database.Feature{f2, f2}))
+	// existing
+	assert.Nil(t, tx.PersistFeatures([]database.Feature{f2}))
+
+	fs := listFeatures(t, tx)
+	assert.Len(t, fs, 1)
+	assert.Equal(t, f2, fs[0])
+}
+
+func TestPersistNamespacedFeatures(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "PersistNamespacedFeatures", true)
+	defer closeTest(t, datastore, tx)
+
+	// existing features
+	f1 := database.Feature{
+		Name:          "wechat",
+		Version:       "0.5",
+		VersionFormat: "dpkg",
+	}
+
+	// non-existing features
+	f2 := database.Feature{
+		Name: "fake!",
+	}
+
+	f3 := database.Feature{
+		Name:          "openssl",
+		Version:       "2.0",
+		VersionFormat: "dpkg",
+	}
+
+	// exising namespace
+	n1 := database.Namespace{
+		Name:          "debian:7",
+		VersionFormat: "dpkg",
+	}
+
+	n3 := database.Namespace{
+		Name:          "debian:8",
+		VersionFormat: "dpkg",
+	}
+
+	// non-existing namespace
+	n2 := database.Namespace{
+		Name:          "debian:non",
+		VersionFormat: "dpkg",
+	}
+
+	// existing namespaced feature
+	nf1 := database.NamespacedFeature{
+		Namespace: n1,
+		Feature:   f1,
+	}
+
+	// invalid namespaced feature
+	nf2 := database.NamespacedFeature{
+		Namespace: n2,
+		Feature:   f2,
+	}
+
+	// new namespaced feature affected by vulnerability
+	nf3 := database.NamespacedFeature{
+		Namespace: n3,
+		Feature:   f3,
+	}
+
+	// namespaced features with namespaces or features not in the database will
+	// generate error.
+	assert.Nil(t, tx.PersistNamespacedFeatures([]database.NamespacedFeature{}))
+
+	assert.NotNil(t, tx.PersistNamespacedFeatures([]database.NamespacedFeature{nf1, nf2}))
+	// valid case: insert nf3
+	assert.Nil(t, tx.PersistNamespacedFeatures([]database.NamespacedFeature{nf1, nf3}))
+
+	all := listNamespacedFeatures(t, tx)
+	assert.Contains(t, all, nf1)
+	assert.Contains(t, all, nf3)
+}
+
+func TestVulnerableFeature(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "VulnerableFeature", true)
+	defer closeTest(t, datastore, tx)
+
+	f1 := database.Feature{
+		Name:          "openssl",
+		Version:       "1.3",
+		VersionFormat: "dpkg",
+	}
+
+	n1 := database.Namespace{
+		Name:          "debian:7",
+		VersionFormat: "dpkg",
+	}
+
+	nf1 := database.NamespacedFeature{
+		Namespace: n1,
+		Feature:   f1,
+	}
+	assert.Nil(t, tx.PersistFeatures([]database.Feature{f1}))
+	assert.Nil(t, tx.PersistNamespacedFeatures([]database.NamespacedFeature{nf1}))
+	assert.Nil(t, tx.CacheAffectedNamespacedFeatures([]database.NamespacedFeature{nf1}))
+	// ensure the namespaced feature is affected correctly
+	anf, err := tx.FindAffectedNamespacedFeatures([]database.NamespacedFeature{nf1})
+	if assert.Nil(t, err) &&
+		assert.Len(t, anf, 1) &&
+		assert.True(t, anf[0].Valid) &&
+		assert.Len(t, anf[0].AffectedBy, 1) {
+		assert.Equal(t, "CVE-OPENSSL-1-DEB7", anf[0].AffectedBy[0].Name)
+	}
+}
+
+func TestFindAffectedNamespacedFeatures(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "FindAffectedNamespacedFeatures", true)
+	defer closeTest(t, datastore, tx)
+	ns := database.NamespacedFeature{
+		Feature: database.Feature{
+			Name:          "openssl",
+			Version:       "1.0",
+			VersionFormat: "dpkg",
+		},
+		Namespace: database.Namespace{
+			Name:          "debian:7",
+			VersionFormat: "dpkg",
+		},
+	}
+
+	ans, err := tx.FindAffectedNamespacedFeatures([]database.NamespacedFeature{ns})
+	if assert.Nil(t, err) &&
+		assert.Len(t, ans, 1) &&
+		assert.True(t, ans[0].Valid) &&
+		assert.Len(t, ans[0].AffectedBy, 1) {
+		assert.Equal(t, "CVE-OPENSSL-1-DEB7", ans[0].AffectedBy[0].Name)
+	}
+}
+
+func listNamespacedFeatures(t *testing.T, tx *pgSession) []database.NamespacedFeature {
+	rows, err := tx.Query(`SELECT f.name, f.version, f.version_format, n.name, n.version_format
+	FROM feature AS f, namespace AS n, namespaced_feature AS nf
+	WHERE nf.feature_id = f.id AND nf.namespace_id = n.id`)
+	if err != nil {
+		t.Error(err)
+		t.FailNow()
+	}
+
+	nf := []database.NamespacedFeature{}
+	for rows.Next() {
+		f := database.NamespacedFeature{}
+		err := rows.Scan(&f.Name, &f.Version, &f.VersionFormat, &f.Namespace.Name, &f.Namespace.VersionFormat)
+		if err != nil {
+			t.Error(err)
+			t.FailNow()
+		}
+		nf = append(nf, f)
+	}
+
+	return nf
+}
+
+func listFeatures(t *testing.T, tx *pgSession) []database.Feature {
+	rows, err := tx.Query("SELECT name, version, version_format FROM feature")
+	if err != nil {
+		t.FailNow()
+	}
+
+	fs := []database.Feature{}
+	for rows.Next() {
+		f := database.Feature{}
+		err := rows.Scan(&f.Name, &f.Version, &f.VersionFormat)
+		if err != nil {
+			t.FailNow()
+		}
+		fs = append(fs, f)
+	}
+	return fs
+}
+
+func assertFeaturesEqual(t *testing.T, expected []database.Feature, actual []database.Feature) bool {
+	if assert.Len(t, actual, len(expected)) {
+		has := map[database.Feature]bool{}
+		for _, nf := range expected {
+			has[nf] = false
+		}
+
+		for _, nf := range actual {
+			has[nf] = true
+		}
+
+		for nf, visited := range has {
+			if !assert.True(t, visited, nf.Name+" is expected") {
+				return false
+			}
+			return true
+		}
+	}
+	return false
+}
+
+func assertNamespacedFeatureEqual(t *testing.T, expected []database.NamespacedFeature, actual []database.NamespacedFeature) bool {
+	if assert.Len(t, actual, len(expected)) {
+		has := map[database.NamespacedFeature]bool{}
+		for _, nf := range expected {
+			has[nf] = false
+		}
+
+		for _, nf := range actual {
+			has[nf] = true
+		}
+
+		for nf, visited := range has {
+			if !assert.True(t, visited, nf.Namespace.Name+":"+nf.Name+" is expected") {
+				return false
+			}
+		}
+		return true
+	}
+	return false
+}
--- a/database/pgsql/keyvalue/keyvalue.go
+++ b/database/pgsql/keyvalue/keyvalue.go
@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.

-package keyvalue
+package pgsql

 import (
 	"database/sql"
@ -20,38 +20,27 @@ import (

 	log "github.com/sirupsen/logrus"

-	"github.com/coreos/clair/database/pgsql/monitoring"
-	"github.com/coreos/clair/database/pgsql/util"
 	"github.com/coreos/clair/pkg/commonerr"
 )

-const (
-	searchKeyValue = `SELECT value FROM KeyValue WHERE key = $1`
-	upsertKeyValue = `
-			INSERT INTO KeyValue(key, value) 
-				VALUES ($1, $2) 
-				ON CONFLICT ON CONSTRAINT keyvalue_key_key 
-				DO UPDATE SET key=$1, value=$2`
-)
-
-func UpdateKeyValue(tx *sql.Tx, key, value string) (err error) {
+func (tx *pgSession) UpdateKeyValue(key, value string) (err error) {
 	if key == "" || value == "" {
 		log.Warning("could not insert a flag which has an empty name or value")
 		return commonerr.NewBadRequestError("could not insert a flag which has an empty name or value")
 	}

-	defer monitoring.ObserveQueryTime("PersistKeyValue", "all", time.Now())
+	defer observeQueryTime("PersistKeyValue", "all", time.Now())

 	_, err = tx.Exec(upsertKeyValue, key, value)
 	if err != nil {
-		return util.HandleError("insertKeyValue", err)
+		return handleError("insertKeyValue", err)
 	}

 	return nil
 }

-func FindKeyValue(tx *sql.Tx, key string) (string, bool, error) {
-	defer monitoring.ObserveQueryTime("FindKeyValue", "all", time.Now())
+func (tx *pgSession) FindKeyValue(key string) (string, bool, error) {
+	defer observeQueryTime("FindKeyValue", "all", time.Now())

 	var value string
 	err := tx.QueryRow(searchKeyValue, key).Scan(&value)
@ -61,7 +50,7 @@ func FindKeyValue(tx *sql.Tx, key string) (string, bool, error) {
 	}

 	if err != nil {
-		return "", false, util.HandleError("searchKeyValue", err)
+		return "", false, handleError("searchKeyValue", err)
 	}

 	return value, true, nil
--- a/database/pgsql/keyvalue/keyvalue_test.go
+++ b/database/pgsql/keyvalue/keyvalue_test.go
@ -12,39 +12,38 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.

-package keyvalue
+package pgsql

 import (
 	"testing"

-	"github.com/coreos/clair/database/pgsql/testutil"
 	"github.com/stretchr/testify/assert"
 )

 func TestKeyValue(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "KeyValue")
-	defer cleanup()
+	datastore, tx := openSessionForTest(t, "KeyValue", true)
+	defer closeTest(t, datastore, tx)

 	// Get non-existing key/value
-	f, ok, err := FindKeyValue(tx, "test")
+	f, ok, err := tx.FindKeyValue("test")
 	assert.Nil(t, err)
 	assert.False(t, ok)

 	// Try to insert invalid key/value.
-	assert.Error(t, UpdateKeyValue(tx, "test", ""))
-	assert.Error(t, UpdateKeyValue(tx, "", "test"))
-	assert.Error(t, UpdateKeyValue(tx, "", ""))
+	assert.Error(t, tx.UpdateKeyValue("test", ""))
+	assert.Error(t, tx.UpdateKeyValue("", "test"))
+	assert.Error(t, tx.UpdateKeyValue("", ""))

 	// Insert and verify.
-	assert.Nil(t, UpdateKeyValue(tx, "test", "test1"))
-	f, ok, err = FindKeyValue(tx, "test")
+	assert.Nil(t, tx.UpdateKeyValue("test", "test1"))
+	f, ok, err = tx.FindKeyValue("test")
 	assert.Nil(t, err)
 	assert.True(t, ok)
 	assert.Equal(t, "test1", f)

 	// Update and verify.
-	assert.Nil(t, UpdateKeyValue(tx, "test", "test2"))
-	f, ok, err = FindKeyValue(tx, "test")
+	assert.Nil(t, tx.UpdateKeyValue("test", "test2"))
+	f, ok, err = tx.FindKeyValue("test")
 	assert.Nil(t, err)
 	assert.True(t, ok)
 	assert.Equal(t, "test2", f)
--- a/database/pgsql/layer.go
+++ b/database/pgsql/layer.go
@ -0,0 +1,308 @@
+// Copyright 2017 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"database/sql"
+	"sort"
+
+	"github.com/coreos/clair/database"
+	"github.com/coreos/clair/pkg/commonerr"
+)
+
+func (tx *pgSession) FindLayer(hash string) (database.Layer, database.Processors, bool, error) {
+	l, p, _, ok, err := tx.findLayer(hash)
+	return l, p, ok, err
+}
+
+func (tx *pgSession) FindLayerWithContent(hash string) (database.LayerWithContent, bool, error) {
+	var (
+		layer   database.LayerWithContent
+		layerID int64
+		ok      bool
+		err     error
+	)
+
+	layer.Layer, layer.ProcessedBy, layerID, ok, err = tx.findLayer(hash)
+	if err != nil {
+		return layer, false, err
+	}
+
+	if !ok {
+		return layer, false, nil
+	}
+
+	layer.Features, err = tx.findLayerFeatures(layerID)
+	layer.Namespaces, err = tx.findLayerNamespaces(layerID)
+	return layer, true, nil
+}
+
+func (tx *pgSession) PersistLayer(layer database.Layer) error {
+	if layer.Hash == "" {
+		return commonerr.NewBadRequestError("Empty Layer Hash is not allowed")
+	}
+
+	_, err := tx.Exec(queryPersistLayer(1), layer.Hash)
+	if err != nil {
+		return handleError("queryPersistLayer", err)
+	}
+
+	return nil
+}
+
+// PersistLayerContent relates layer identified by hash with namespaces,
+// features and processors provided. If the layer, namespaces, features are not
+// in database, the function returns an error.
+func (tx *pgSession) PersistLayerContent(hash string, namespaces []database.Namespace, features []database.Feature, processedBy database.Processors) error {
+	if hash == "" {
+		return commonerr.NewBadRequestError("Empty layer hash is not allowed")
+	}
+
+	var layerID int64
+	err := tx.QueryRow(searchLayer, hash).Scan(&layerID)
+	if err != nil {
+		return err
+	}
+
+	if err = tx.persistLayerNamespace(layerID, namespaces); err != nil {
+		return err
+	}
+
+	if err = tx.persistLayerFeatures(layerID, features); err != nil {
+		return err
+	}
+
+	if err = tx.persistLayerDetectors(layerID, processedBy.Detectors); err != nil {
+		return err
+	}
+
+	if err = tx.persistLayerListers(layerID, processedBy.Listers); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (tx *pgSession) persistLayerDetectors(id int64, detectors []string) error {
+	if len(detectors) == 0 {
+		return nil
+	}
+
+	// Sorting is needed before inserting into database to prevent deadlock.
+	sort.Strings(detectors)
+	keys := make([]interface{}, len(detectors)*2)
+	for i, d := range detectors {
+		keys[i*2] = id
+		keys[i*2+1] = d
+	}
+	_, err := tx.Exec(queryPersistLayerDetectors(len(detectors)), keys...)
+	if err != nil {
+		return handleError("queryPersistLayerDetectors", err)
+	}
+	return nil
+}
+
+func (tx *pgSession) persistLayerListers(id int64, listers []string) error {
+	if len(listers) == 0 {
+		return nil
+	}
+
+	sort.Strings(listers)
+	keys := make([]interface{}, len(listers)*2)
+	for i, d := range listers {
+		keys[i*2] = id
+		keys[i*2+1] = d
+	}
+
+	_, err := tx.Exec(queryPersistLayerListers(len(listers)), keys...)
+	if err != nil {
+		return handleError("queryPersistLayerDetectors", err)
+	}
+	return nil
+}
+
+func (tx *pgSession) persistLayerFeatures(id int64, features []database.Feature) error {
+	if len(features) == 0 {
+		return nil
+	}
+
+	fIDs, err := tx.findFeatureIDs(features)
+	if err != nil {
+		return err
+	}
+
+	ids := make([]int, len(fIDs))
+	for i, fID := range fIDs {
+		if !fID.Valid {
+			return errNamespaceNotFound
+		}
+		ids[i] = int(fID.Int64)
+	}
+
+	sort.IntSlice(ids).Sort()
+	keys := make([]interface{}, len(features)*2)
+	for i, fID := range ids {
+		keys[i*2] = id
+		keys[i*2+1] = fID
+	}
+
+	_, err = tx.Exec(queryPersistLayerFeature(len(features)), keys...)
+	if err != nil {
+		return handleError("queryPersistLayerFeature", err)
+	}
+	return nil
+}
+
+func (tx *pgSession) persistLayerNamespace(id int64, namespaces []database.Namespace) error {
+	if len(namespaces) == 0 {
+		return nil
+	}
+
+	nsIDs, err := tx.findNamespaceIDs(namespaces)
+	if err != nil {
+		return err
+	}
+
+	// for every bulk persist operation, the input data should be sorted.
+	ids := make([]int, len(nsIDs))
+	for i, nsID := range nsIDs {
+		if !nsID.Valid {
+			panic(errNamespaceNotFound)
+		}
+		ids[i] = int(nsID.Int64)
+	}
+
+	sort.IntSlice(ids).Sort()
+
+	keys := make([]interface{}, len(namespaces)*2)
+	for i, nsID := range ids {
+		keys[i*2] = id
+		keys[i*2+1] = nsID
+	}
+
+	_, err = tx.Exec(queryPersistLayerNamespace(len(namespaces)), keys...)
+	if err != nil {
+		return handleError("queryPersistLayerNamespace", err)
+	}
+	return nil
+}
+
+func (tx *pgSession) persistProcessors(listerQuery, listerQueryName, detectorQuery, detectorQueryName string, id int64, processors database.Processors) error {
+	stmt, err := tx.Prepare(listerQuery)
+	if err != nil {
+		return handleError(listerQueryName, err)
+	}
+
+	for _, l := range processors.Listers {
+		_, err := stmt.Exec(id, l)
+		if err != nil {
+			stmt.Close()
+			return handleError(listerQueryName, err)
+		}
+	}
+
+	if err := stmt.Close(); err != nil {
+		return handleError(listerQueryName, err)
+	}
+
+	stmt, err = tx.Prepare(detectorQuery)
+	if err != nil {
+		return handleError(detectorQueryName, err)
+	}
+
+	for _, d := range processors.Detectors {
+		_, err := stmt.Exec(id, d)
+		if err != nil {
+			stmt.Close()
+			return handleError(detectorQueryName, err)
+		}
+	}
+
+	if err := stmt.Close(); err != nil {
+		return handleError(detectorQueryName, err)
+	}
+
+	return nil
+}
+
+func (tx *pgSession) findLayerNamespaces(layerID int64) ([]database.Namespace, error) {
+	var namespaces []database.Namespace
+
+	rows, err := tx.Query(searchLayerNamespaces, layerID)
+	if err != nil {
+		return nil, handleError("searchLayerFeatures", err)
+	}
+
+	for rows.Next() {
+		ns := database.Namespace{}
+		err := rows.Scan(&ns.Name, &ns.VersionFormat)
+		if err != nil {
+			return nil, err
+		}
+		namespaces = append(namespaces, ns)
+	}
+	return namespaces, nil
+}
+
+func (tx *pgSession) findLayerFeatures(layerID int64) ([]database.Feature, error) {
+	var features []database.Feature
+
+	rows, err := tx.Query(searchLayerFeatures, layerID)
+	if err != nil {
+		return nil, handleError("searchLayerFeatures", err)
+	}
+
+	for rows.Next() {
+		f := database.Feature{}
+		err := rows.Scan(&f.Name, &f.Version, &f.VersionFormat)
+		if err != nil {
+			return nil, err
+		}
+		features = append(features, f)
+	}
+	return features, nil
+}
+
+func (tx *pgSession) findLayer(hash string) (database.Layer, database.Processors, int64, bool, error) {
+	var (
+		layerID    int64
+		layer      = database.Layer{Hash: hash}
+		processors database.Processors
+	)
+
+	if hash == "" {
+		return layer, processors, layerID, false, commonerr.NewBadRequestError("Empty Layer Hash is not allowed")
+	}
+
+	err := tx.QueryRow(searchLayer, hash).Scan(&layerID)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return layer, processors, layerID, false, nil
+		}
+		return layer, processors, layerID, false, err
+	}
+
+	processors.Detectors, err = tx.findProcessors(searchLayerDetectors, "searchLayerDetectors", "detector", layerID)
+	if err != nil {
+		return layer, processors, layerID, false, err
+	}
+
+	processors.Listers, err = tx.findProcessors(searchLayerListers, "searchLayerListers", "lister", layerID)
+	if err != nil {
+		return layer, processors, layerID, false, err
+	}
+
+	return layer, processors, layerID, true, nil
+}
--- a/database/pgsql/layer/layer.go
+++ b/database/pgsql/layer/layer.go
@ -1,177 +0,0 @@
-// Copyright 2017 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package layer
-
-import (
-	"database/sql"
-
-	"github.com/deckarep/golang-set"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/detector"
-	"github.com/coreos/clair/database/pgsql/util"
-	"github.com/coreos/clair/pkg/commonerr"
-)
-
-const (
-	soiLayer = `
-		WITH new_layer AS (
-			INSERT INTO layer (hash)
-			SELECT CAST ($1 AS VARCHAR)
-			WHERE NOT EXISTS (SELECT id FROM layer WHERE hash = $1)
-			RETURNING id
-		)
-		SELECT id FROM new_Layer
-		UNION
-		SELECT id FROM layer WHERE hash = $1`
-
-	findLayerID = `SELECT id FROM layer WHERE hash = $1`
-)
-
-func FindLayer(tx *sql.Tx, hash string) (database.Layer, bool, error) {
-	layer := database.Layer{Hash: hash}
-	if hash == "" {
-		return layer, false, commonerr.NewBadRequestError("non empty layer hash is expected.")
-	}
-
-	layerID, ok, err := FindLayerID(tx, hash)
-	if err != nil || !ok {
-		return layer, ok, err
-	}
-
-	detectorMap, err := detector.FindAllDetectors(tx)
-	if err != nil {
-		return layer, false, err
-	}
-
-	if layer.By, err = FindLayerDetectors(tx, layerID); err != nil {
-		return layer, false, err
-	}
-
-	if layer.Features, err = FindLayerFeatures(tx, layerID, detectorMap); err != nil {
-		return layer, false, err
-	}
-
-	if layer.Namespaces, err = FindLayerNamespaces(tx, layerID, detectorMap); err != nil {
-		return layer, false, err
-	}
-
-	return layer, true, nil
-}
-
-func sanitizePersistLayerInput(hash string, features []database.LayerFeature, namespaces []database.LayerNamespace, detectedBy []database.Detector) error {
-	if hash == "" {
-		return commonerr.NewBadRequestError("expected non-empty layer hash")
-	}
-
-	detectedBySet := mapset.NewSet()
-	for _, d := range detectedBy {
-		detectedBySet.Add(d)
-	}
-
-	for _, f := range features {
-		if !detectedBySet.Contains(f.By) {
-			return database.ErrInvalidParameters
-		}
-	}
-
-	for _, n := range namespaces {
-		if !detectedBySet.Contains(n.By) {
-			return database.ErrInvalidParameters
-		}
-	}
-
-	return nil
-}
-
-// PersistLayer saves the content of a layer to the database.
-func PersistLayer(tx *sql.Tx, hash string, features []database.LayerFeature, namespaces []database.LayerNamespace, detectedBy []database.Detector) error {
-	var (
-		err         error
-		id          int64
-		detectorIDs []int64
-	)
-
-	if err = sanitizePersistLayerInput(hash, features, namespaces, detectedBy); err != nil {
-		return err
-	}
-
-	if id, err = SoiLayer(tx, hash); err != nil {
-		return err
-	}
-
-	if detectorIDs, err = detector.FindDetectorIDs(tx, detectedBy); err != nil {
-		if err == commonerr.ErrNotFound {
-			return database.ErrMissingEntities
-		}
-
-		return err
-	}
-
-	if err = PersistLayerDetectors(tx, id, detectorIDs); err != nil {
-		return err
-	}
-
-	if err = PersistAllLayerFeatures(tx, id, features); err != nil {
-		return err
-	}
-
-	if err = PersistAllLayerNamespaces(tx, id, namespaces); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func FindLayerID(tx *sql.Tx, hash string) (int64, bool, error) {
-	var layerID int64
-	err := tx.QueryRow(findLayerID, hash).Scan(&layerID)
-	if err != nil {
-		if err == sql.ErrNoRows {
-			return layerID, false, nil
-		}
-
-		return layerID, false, util.HandleError("findLayerID", err)
-	}
-
-	return layerID, true, nil
-}
-
-func FindLayerIDs(tx *sql.Tx, hashes []string) ([]int64, bool, error) {
-	layerIDs := make([]int64, 0, len(hashes))
-	for _, hash := range hashes {
-		id, ok, err := FindLayerID(tx, hash)
-		if !ok {
-			return nil, false, nil
-		}
-
-		if err != nil {
-			return nil, false, err
-		}
-
-		layerIDs = append(layerIDs, id)
-	}
-
-	return layerIDs, true, nil
-}
-
-func SoiLayer(tx *sql.Tx, hash string) (int64, error) {
-	var id int64
-	if err := tx.QueryRow(soiLayer, hash).Scan(&id); err != nil {
-		return 0, util.HandleError("soiLayer", err)
-	}
-
-	return id, nil
-}
--- a/database/pgsql/layer/layer_detector.go
+++ b/database/pgsql/layer/layer_detector.go
@ -1,66 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package layer
-
-import (
-	"database/sql"
-
-	"github.com/deckarep/golang-set"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/detector"
-	"github.com/coreos/clair/database/pgsql/util"
-)
-
-const (
-	selectLayerDetectors = `
-		SELECT d.name, d.version, d.dtype
-			FROM layer_detector, detector AS d
-			WHERE layer_detector.detector_id = d.id AND layer_detector.layer_id = $1;`
-
-	persistLayerDetector = `
-			INSERT INTO layer_detector (layer_id, detector_id)
-			SELECT $1, $2
-			WHERE NOT EXISTS (SELECT id FROM layer_detector WHERE layer_id = $1 AND detector_id = $2)`
-)
-
-func PersistLayerDetector(tx *sql.Tx, layerID int64, detectorID int64) error {
-	if _, err := tx.Exec(persistLayerDetector, layerID, detectorID); err != nil {
-		return util.HandleError("persistLayerDetector", err)
-	}
-
-	return nil
-}
-
-func PersistLayerDetectors(tx *sql.Tx, layerID int64, detectorIDs []int64) error {
-	alreadySaved := mapset.NewSet()
-	for _, id := range detectorIDs {
-		if alreadySaved.Contains(id) {
-			continue
-		}
-
-		alreadySaved.Add(id)
-		if err := PersistLayerDetector(tx, layerID, id); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func FindLayerDetectors(tx *sql.Tx, id int64) ([]database.Detector, error) {
-	detectors, err := detector.GetDetectors(tx, selectLayerDetectors, id)
-	return detectors, err
-}
--- a/database/pgsql/layer/layer_feature.go
+++ b/database/pgsql/layer/layer_feature.go
@ -1,147 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package layer
-
-import (
-	"database/sql"
-	"sort"
-
-	"github.com/coreos/clair/database/pgsql/namespace"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/detector"
-	"github.com/coreos/clair/database/pgsql/feature"
-	"github.com/coreos/clair/database/pgsql/util"
-)
-
-const findLayerFeatures = `
-SELECT
-	f.name, f.version, f.version_format, ft.name, lf.detector_id, ns.name, ns.version_format
-FROM
-	layer_feature AS lf
-LEFT JOIN feature f on f.id = lf.feature_id
-LEFT JOIN feature_type ft on ft.id = f.type
-LEFT JOIN namespace ns ON ns.id = lf.namespace_id
-
-WHERE lf.layer_id = $1`
-
-func queryPersistLayerFeature(count int) string {
-	return util.QueryPersist(count,
-		"layer_feature",
-		"layer_feature_layer_id_feature_id_namespace_id_key",
-		"layer_id",
-		"feature_id",
-		"detector_id",
-		"namespace_id")
-}
-
-// dbLayerFeature represents the layer_feature table
-type dbLayerFeature struct {
-	layerID     int64
-	featureID   int64
-	detectorID  int64
-	namespaceID sql.NullInt64
-}
-
-func FindLayerFeatures(tx *sql.Tx, layerID int64, detectors detector.DetectorMap) ([]database.LayerFeature, error) {
-	rows, err := tx.Query(findLayerFeatures, layerID)
-	if err != nil {
-		return nil, util.HandleError("findLayerFeatures", err)
-	}
-	defer rows.Close()
-
-	features := []database.LayerFeature{}
-	for rows.Next() {
-		var (
-			detectorID int64
-			feature    database.LayerFeature
-		)
-		var namespaceName, namespaceVersion sql.NullString
-		if err := rows.Scan(&feature.Name, &feature.Version, &feature.VersionFormat, &feature.Type, &detectorID, &namespaceName, &namespaceVersion); err != nil {
-			return nil, util.HandleError("findLayerFeatures", err)
-		}
-		feature.PotentialNamespace.Name = namespaceName.String
-		feature.PotentialNamespace.VersionFormat = namespaceVersion.String
-
-		feature.By = detectors.ByID[detectorID]
-		features = append(features, feature)
-	}
-
-	return features, nil
-}
-
-func PersistAllLayerFeatures(tx *sql.Tx, layerID int64, features []database.LayerFeature) error {
-	detectorMap, err := detector.FindAllDetectors(tx)
-	if err != nil {
-		return err
-	}
-	var namespaces []database.Namespace
-	for _, feature := range features {
-		namespaces = append(namespaces, feature.PotentialNamespace)
-	}
-	nameSpaceIDs, _ := namespace.FindNamespaceIDs(tx, namespaces)
-	featureNamespaceMap := map[database.Namespace]sql.NullInt64{}
-	rawFeatures := make([]database.Feature, 0, len(features))
-	for i, f := range features {
-		rawFeatures = append(rawFeatures, f.Feature)
-		if f.PotentialNamespace.Valid() {
-			featureNamespaceMap[f.PotentialNamespace] = nameSpaceIDs[i]
-		}
-	}
-
-	featureIDs, err := feature.FindFeatureIDs(tx, rawFeatures)
-	if err != nil {
-		return err
-	}
-	var namespaceID sql.NullInt64
-	dbFeatures := make([]dbLayerFeature, 0, len(features))
-	for i, f := range features {
-		detectorID := detectorMap.ByValue[f.By]
-		featureID := featureIDs[i].Int64
-		if !featureIDs[i].Valid {
-			return database.ErrMissingEntities
-		}
-		namespaceID = featureNamespaceMap[f.PotentialNamespace]
-
-		dbFeatures = append(dbFeatures, dbLayerFeature{layerID, featureID, detectorID, namespaceID})
-	}
-
-	if err := PersistLayerFeatures(tx, dbFeatures); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func PersistLayerFeatures(tx *sql.Tx, features []dbLayerFeature) error {
-	if len(features) == 0 {
-		return nil
-	}
-
-	sort.Slice(features, func(i, j int) bool {
-		return features[i].featureID < features[j].featureID
-	})
-	keys := make([]interface{}, 0, len(features)*4)
-
-	for _, f := range features {
-		keys = append(keys, f.layerID, f.featureID, f.detectorID, f.namespaceID)
-	}
-
-	_, err := tx.Exec(queryPersistLayerFeature(len(features)), keys...)
-	if err != nil {
-		return util.HandleError("queryPersistLayerFeature", err)
-	}
-	return nil
-}
--- a/database/pgsql/layer/layer_namespace.go
+++ b/database/pgsql/layer/layer_namespace.go
@ -1,127 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package layer
-
-import (
-	"database/sql"
-	"sort"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/detector"
-	"github.com/coreos/clair/database/pgsql/namespace"
-	"github.com/coreos/clair/database/pgsql/util"
-)
-
-const findLayerNamespaces = `
-SELECT ns.name, ns.version_format, ln.detector_id
-	FROM layer_namespace AS ln, namespace AS ns
-	WHERE ln.namespace_id = ns.id
-		AND ln.layer_id = $1`
-
-func queryPersistLayerNamespace(count int) string {
-	return util.QueryPersist(count,
-		"layer_namespace",
-		"layer_namespace_layer_id_namespace_id_key",
-		"layer_id",
-		"namespace_id",
-		"detector_id")
-}
-
-// dbLayerNamespace represents the layer_namespace table.
-type dbLayerNamespace struct {
-	layerID     int64
-	namespaceID int64
-	detectorID  int64
-}
-
-func FindLayerNamespaces(tx *sql.Tx, layerID int64, detectors detector.DetectorMap) ([]database.LayerNamespace, error) {
-	rows, err := tx.Query(findLayerNamespaces, layerID)
-	if err != nil {
-		return nil, util.HandleError("findLayerNamespaces", err)
-	}
-
-	namespaces := []database.LayerNamespace{}
-	for rows.Next() {
-		var (
-			namespace  database.LayerNamespace
-			detectorID int64
-		)
-
-		if err := rows.Scan(&namespace.Name, &namespace.VersionFormat, &detectorID); err != nil {
-			return nil, err
-		}
-
-		namespace.By = detectors.ByID[detectorID]
-		namespaces = append(namespaces, namespace)
-	}
-
-	return namespaces, nil
-}
-
-func PersistAllLayerNamespaces(tx *sql.Tx, layerID int64, namespaces []database.LayerNamespace) error {
-	detectorMap, err := detector.FindAllDetectors(tx)
-	if err != nil {
-		return err
-	}
-
-	// TODO(sidac): This kind of type conversion is very useless and wasteful,
-	// we need interfaces around the database models to reduce these kind of
-	// operations.
-	rawNamespaces := make([]database.Namespace, 0, len(namespaces))
-	for _, ns := range namespaces {
-		rawNamespaces = append(rawNamespaces, ns.Namespace)
-	}
-
-	rawNamespaceIDs, err := namespace.FindNamespaceIDs(tx, rawNamespaces)
-	if err != nil {
-		return err
-	}
-
-	dbLayerNamespaces := make([]dbLayerNamespace, 0, len(namespaces))
-	for i, ns := range namespaces {
-		detectorID := detectorMap.ByValue[ns.By]
-		namespaceID := rawNamespaceIDs[i].Int64
-		if !rawNamespaceIDs[i].Valid {
-			return database.ErrMissingEntities
-		}
-
-		dbLayerNamespaces = append(dbLayerNamespaces, dbLayerNamespace{layerID, namespaceID, detectorID})
-	}
-
-	return PersistLayerNamespaces(tx, dbLayerNamespaces)
-}
-
-func PersistLayerNamespaces(tx *sql.Tx, namespaces []dbLayerNamespace) error {
-	if len(namespaces) == 0 {
-		return nil
-	}
-
-	// for every bulk persist operation, the input data should be sorted.
-	sort.Slice(namespaces, func(i, j int) bool {
-		return namespaces[i].namespaceID < namespaces[j].namespaceID
-	})
-
-	keys := make([]interface{}, 0, len(namespaces)*3)
-	for _, row := range namespaces {
-		keys = append(keys, row.layerID, row.namespaceID, row.detectorID)
-	}
-
-	_, err := tx.Exec(queryPersistLayerNamespace(len(namespaces)), keys...)
-	if err != nil {
-		return util.HandleError("queryPersistLayerNamespace", err)
-	}
-
-	return nil
-}
--- a/database/pgsql/layer/layer_test.go
+++ b/database/pgsql/layer/layer_test.go
@ -1,214 +0,0 @@
-// Copyright 2017 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package layer
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/testutil"
-)
-
-var persistLayerTests = []struct {
-	title      string
-	name       string
-	by         []database.Detector
-	features   []database.LayerFeature
-	namespaces []database.LayerNamespace
-	layer      *database.Layer
-	err        string
-}{
-	{
-		title: "invalid layer name",
-		name:  "",
-		err:   "expected non-empty layer hash",
-	},
-	{
-		title: "layer with inconsistent feature and detectors",
-		name:  "random-forest",
-		by:    []database.Detector{testutil.RealDetectors[2]},
-		features: []database.LayerFeature{
-			{testutil.RealFeatures[1], testutil.RealDetectors[1], database.Namespace{}},
-		},
-		err: "parameters are not valid",
-	},
-	{
-		title: "layer with non-existing feature",
-		name:  "random-forest",
-		err:   "associated immutable entities are missing in the database",
-		by:    []database.Detector{testutil.RealDetectors[2]},
-		features: []database.LayerFeature{
-			{testutil.FakeFeatures[1], testutil.RealDetectors[2], database.Namespace{}},
-		},
-	},
-	{
-		title: "layer with non-existing namespace",
-		name:  "random-forest2",
-		err:   "associated immutable entities are missing in the database",
-		by:    []database.Detector{testutil.RealDetectors[1]},
-		namespaces: []database.LayerNamespace{
-			{testutil.FakeNamespaces[1], testutil.RealDetectors[1]},
-		},
-	},
-	{
-		title: "layer with non-existing detector",
-		name:  "random-forest3",
-		err:   "associated immutable entities are missing in the database",
-		by:    []database.Detector{testutil.FakeDetector[1]},
-	},
-	{
-
-		title: "valid layer",
-		name:  "hamsterhouse",
-		by:    []database.Detector{testutil.RealDetectors[1], testutil.RealDetectors[2]},
-		features: []database.LayerFeature{
-			{testutil.RealFeatures[1], testutil.RealDetectors[2], database.Namespace{}},
-			{testutil.RealFeatures[2], testutil.RealDetectors[2], database.Namespace{}},
-		},
-		namespaces: []database.LayerNamespace{
-			{testutil.RealNamespaces[1], testutil.RealDetectors[1]},
-		},
-		layer: &database.Layer{
-			Hash: "hamsterhouse",
-			By:   []database.Detector{testutil.RealDetectors[1], testutil.RealDetectors[2]},
-			Features: []database.LayerFeature{
-				{testutil.RealFeatures[1], testutil.RealDetectors[2], database.Namespace{}},
-				{testutil.RealFeatures[2], testutil.RealDetectors[2], database.Namespace{}},
-			},
-			Namespaces: []database.LayerNamespace{
-				{testutil.RealNamespaces[1], testutil.RealDetectors[1]},
-			},
-		},
-	},
-	{
-		title: "update existing layer",
-		name:  "layer-1",
-		by:    []database.Detector{testutil.RealDetectors[3], testutil.RealDetectors[4]},
-		features: []database.LayerFeature{
-			{testutil.RealFeatures[4], testutil.RealDetectors[3], database.Namespace{}},
-		},
-		namespaces: []database.LayerNamespace{
-			{testutil.RealNamespaces[3], testutil.RealDetectors[4]},
-		},
-		layer: &database.Layer{
-			Hash: "layer-1",
-			By:   []database.Detector{testutil.RealDetectors[1], testutil.RealDetectors[2], testutil.RealDetectors[3], testutil.RealDetectors[4]},
-			Features: []database.LayerFeature{
-				{testutil.RealFeatures[1], testutil.RealDetectors[2], database.Namespace{}},
-				{testutil.RealFeatures[2], testutil.RealDetectors[2], database.Namespace{}},
-				{testutil.RealFeatures[4], testutil.RealDetectors[3], database.Namespace{}},
-			},
-			Namespaces: []database.LayerNamespace{
-				{testutil.RealNamespaces[1], testutil.RealDetectors[1]},
-				{testutil.RealNamespaces[3], testutil.RealDetectors[4]},
-			},
-		},
-	},
-
-	{
-		title: "layer with potential namespace",
-		name:  "layer-potential-namespace",
-		by:    []database.Detector{testutil.RealDetectors[3]},
-		features: []database.LayerFeature{
-			{testutil.RealFeatures[4], testutil.RealDetectors[3], testutil.RealNamespaces[4]},
-		},
-		namespaces: []database.LayerNamespace{
-			{testutil.RealNamespaces[3], testutil.RealDetectors[3]},
-		},
-		layer: &database.Layer{
-			Hash: "layer-potential-namespace",
-			By:   []database.Detector{testutil.RealDetectors[3]},
-			Features: []database.LayerFeature{
-				{testutil.RealFeatures[4], testutil.RealDetectors[3], testutil.RealNamespaces[4]},
-			},
-			Namespaces: []database.LayerNamespace{
-				{testutil.RealNamespaces[3], testutil.RealDetectors[3]},
-			},
-		},
-	},
-}
-
-func TestPersistLayer(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "PersistLayer")
-	defer cleanup()
-
-	for _, test := range persistLayerTests {
-		t.Run(test.title, func(t *testing.T) {
-			err := PersistLayer(tx, test.name, test.features, test.namespaces, test.by)
-			if test.err != "" {
-				assert.EqualError(t, err, test.err, "unexpected error")
-				return
-			}
-
-			assert.Nil(t, err)
-			if test.layer != nil {
-				layer, ok, err := FindLayer(tx, test.name)
-				assert.Nil(t, err)
-				assert.True(t, ok)
-				database.AssertLayerEqual(t, test.layer, &layer)
-			}
-		})
-	}
-}
-
-var findLayerTests = []struct {
-	title string
-	in    string
-
-	out *database.Layer
-	err string
-	ok  bool
-}{
-	{
-		title: "invalid layer name",
-		in:    "",
-		err:   "non empty layer hash is expected.",
-	},
-	{
-		title: "non-existing layer",
-		in:    "layer-non-existing",
-		ok:    false,
-		out:   nil,
-	},
-	{
-		title: "existing layer",
-		in:    "layer-4",
-		ok:    true,
-		out:   testutil.TakeLayerPointerFromMap(testutil.RealLayers, 6),
-	},
-}
-
-func TestFindLayer(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "FindLayer")
-	defer cleanup()
-
-	for _, test := range findLayerTests {
-		t.Run(test.title, func(t *testing.T) {
-			layer, ok, err := FindLayer(tx, test.in)
-			if test.err != "" {
-				assert.EqualError(t, err, test.err, "unexpected error")
-				return
-			}
-
-			assert.Nil(t, err)
-			assert.Equal(t, test.ok, ok)
-			if test.ok {
-				database.AssertLayerEqual(t, test.out, &layer)
-			}
-		})
-	}
-}
--- a/database/pgsql/layer_test.go
+++ b/database/pgsql/layer_test.go
@ -0,0 +1,114 @@
+// Copyright 2017 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/coreos/clair/database"
+)
+
+func TestPersistLayer(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "PersistLayer", false)
+	defer closeTest(t, datastore, tx)
+
+	l1 := database.Layer{}
+	l2 := database.Layer{Hash: "HESOYAM"}
+
+	// invalid
+	assert.NotNil(t, tx.PersistLayer(l1))
+	// valid
+	assert.Nil(t, tx.PersistLayer(l2))
+	// duplicated
+	assert.Nil(t, tx.PersistLayer(l2))
+}
+
+func TestPersistLayerProcessors(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "PersistLayerProcessors", true)
+	defer closeTest(t, datastore, tx)
+
+	// invalid
+	assert.NotNil(t, tx.PersistLayerContent("hash", []database.Namespace{}, []database.Feature{}, database.Processors{}))
+	// valid
+	assert.Nil(t, tx.PersistLayerContent("layer-4", []database.Namespace{}, []database.Feature{}, database.Processors{Detectors: []string{"new detector!"}}))
+}
+
+func TestFindLayer(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "FindLayer", true)
+	defer closeTest(t, datastore, tx)
+
+	expected := database.Layer{Hash: "layer-4"}
+	expectedProcessors := database.Processors{
+		Detectors: []string{"os-release", "apt-sources"},
+		Listers:   []string{"dpkg", "rpm"},
+	}
+
+	// invalid
+	_, _, _, err := tx.FindLayer("")
+	assert.NotNil(t, err)
+	_, _, ok, err := tx.FindLayer("layer-non")
+	assert.Nil(t, err)
+	assert.False(t, ok)
+
+	// valid
+	layer, processors, ok2, err := tx.FindLayer("layer-4")
+	if assert.Nil(t, err) && assert.True(t, ok2) {
+		assert.Equal(t, expected, layer)
+		assertProcessorsEqual(t, expectedProcessors, processors)
+	}
+}
+
+func TestFindLayerWithContent(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "FindLayerWithContent", true)
+	defer closeTest(t, datastore, tx)
+
+	_, _, err := tx.FindLayerWithContent("")
+	assert.NotNil(t, err)
+	_, ok, err := tx.FindLayerWithContent("layer-non")
+	assert.Nil(t, err)
+	assert.False(t, ok)
+
+	expectedL := database.LayerWithContent{
+		Layer: database.Layer{
+			Hash: "layer-4",
+		},
+		Features: []database.Feature{
+			{Name: "fake", Version: "2.0", VersionFormat: "rpm"},
+			{Name: "openssl", Version: "2.0", VersionFormat: "dpkg"},
+		},
+		Namespaces: []database.Namespace{
+			{Name: "debian:7", VersionFormat: "dpkg"},
+			{Name: "fake:1.0", VersionFormat: "rpm"},
+		},
+		ProcessedBy: database.Processors{
+			Detectors: []string{"os-release", "apt-sources"},
+			Listers:   []string{"dpkg", "rpm"},
+		},
+	}
+
+	layer, ok2, err := tx.FindLayerWithContent("layer-4")
+	if assert.Nil(t, err) && assert.True(t, ok2) {
+		assertLayerWithContentEqual(t, expectedL, layer)
+	}
+}
+
+func assertLayerWithContentEqual(t *testing.T, expected database.LayerWithContent, actual database.LayerWithContent) bool {
+	return assert.Equal(t, expected.Layer, actual.Layer) &&
+		assertFeaturesEqual(t, expected.Features, actual.Features) &&
+		assertProcessorsEqual(t, expected.ProcessedBy, actual.ProcessedBy) &&
+		assertNamespacesEqual(t, expected.Namespaces, actual.Namespaces)
+}
--- a/database/pgsql/lock.go
+++ b/database/pgsql/lock.go
@ -0,0 +1,113 @@
+// Copyright 2017 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"errors"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+
+	"github.com/coreos/clair/pkg/commonerr"
+)
+
+var (
+	errLockNotFound = errors.New("lock is not in database")
+)
+
+// Lock tries to set a temporary lock in the database.
+//
+// Lock does not block, instead, it returns true and its expiration time
+// is the lock has been successfully acquired or false otherwise.
+func (tx *pgSession) Lock(name string, owner string, duration time.Duration, renew bool) (bool, time.Time, error) {
+	if name == "" || owner == "" || duration == 0 {
+		log.Warning("could not create an invalid lock")
+		return false, time.Time{}, commonerr.NewBadRequestError("Invalid Lock Parameters")
+	}
+
+	until := time.Now().Add(duration)
+	if renew {
+		defer observeQueryTime("Lock", "update", time.Now())
+		// Renew lock.
+		r, err := tx.Exec(updateLock, name, owner, until)
+		if err != nil {
+			return false, until, handleError("updateLock", err)
+		}
+
+		if n, err := r.RowsAffected(); err == nil {
+			return n > 0, until, nil
+		}
+		return false, until, handleError("updateLock", err)
+	} else if err := tx.pruneLocks(); err != nil {
+		return false, until, err
+	}
+
+	// Lock.
+	defer observeQueryTime("Lock", "soiLock", time.Now())
+	_, err := tx.Exec(soiLock, name, owner, until)
+	if err != nil {
+		if isErrUniqueViolation(err) {
+			return false, until, nil
+		}
+		return false, until, handleError("insertLock", err)
+	}
+	return true, until, nil
+}
+
+// Unlock unlocks a lock specified by its name if I own it
+func (tx *pgSession) Unlock(name, owner string) error {
+	if name == "" || owner == "" {
+		return commonerr.NewBadRequestError("Invalid Lock Parameters")
+	}
+
+	defer observeQueryTime("Unlock", "all", time.Now())
+
+	_, err := tx.Exec(removeLock, name, owner)
+	return err
+}
+
+// FindLock returns the owner of a lock specified by its name and its
+// expiration time.
+func (tx *pgSession) FindLock(name string) (string, time.Time, bool, error) {
+	if name == "" {
+		return "", time.Time{}, false, commonerr.NewBadRequestError("could not find an invalid lock")
+	}
+
+	defer observeQueryTime("FindLock", "all", time.Now())
+
+	var owner string
+	var until time.Time
+	err := tx.QueryRow(searchLock, name).Scan(&owner, &until)
+	if err != nil {
+		return owner, until, false, handleError("searchLock", err)
+	}
+
+	return owner, until, true, nil
+}
+
+// pruneLocks removes every expired locks from the database
+func (tx *pgSession) pruneLocks() error {
+	defer observeQueryTime("pruneLocks", "all", time.Now())
+
+	if r, err := tx.Exec(removeLockExpired); err != nil {
+		return handleError("removeLockExpired", err)
+	} else if affected, err := r.RowsAffected(); err != nil {
+		return handleError("removeLockExpired", err)
+	} else {
+		log.Debugf("Pruned %d Locks", affected)
+	}
+
+	return nil
+}
--- a/database/pgsql/lock/lock.go
+++ b/database/pgsql/lock/lock.go
@ -1,109 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package lock
-
-import (
-	"database/sql"
-	"time"
-
-	"github.com/coreos/clair/database/pgsql/monitoring"
-	"github.com/coreos/clair/database/pgsql/util"
-	log "github.com/sirupsen/logrus"
-)
-
-const (
-	searchLock        = `SELECT until FROM Lock WHERE name = $1`
-	updateLock        = `UPDATE Lock SET until = $3 WHERE name = $1 AND owner = $2`
-	removeLock        = `DELETE FROM Lock WHERE name = $1 AND owner = $2`
-	removeLockExpired = `DELETE FROM LOCK WHERE until < $1`
-
-	soiLock = `
-	WITH new_lock AS (
-		INSERT INTO lock (name, owner, until) 
-		SELECT CAST ($1 AS TEXT), CAST ($2 AS TEXT), CAST ($3 AS TIMESTAMP)
-		WHERE NOT EXISTS (SELECT id FROM lock WHERE name = $1)
-		RETURNING owner, until
-	)
-	SELECT * FROM new_lock
-	UNION
-	SELECT owner, until FROM lock WHERE name = $1`
-)
-
-func AcquireLock(tx *sql.Tx, lockName, whoami string, desiredDuration time.Duration) (bool, time.Time, error) {
-	if lockName == "" || whoami == "" || desiredDuration == 0 {
-		panic("invalid lock parameters")
-	}
-
-	if err := PruneLocks(tx); err != nil {
-		return false, time.Time{}, err
-	}
-
-	var (
-		desiredLockedUntil = time.Now().UTC().Add(desiredDuration)
-
-		lockedUntil time.Time
-		lockOwner   string
-	)
-
-	defer monitoring.ObserveQueryTime("Lock", "soiLock", time.Now())
-	err := tx.QueryRow(soiLock, lockName, whoami, desiredLockedUntil).Scan(&lockOwner, &lockedUntil)
-	return lockOwner == whoami, lockedUntil, util.HandleError("AcquireLock", err)
-}
-
-func ExtendLock(tx *sql.Tx, lockName, whoami string, desiredDuration time.Duration) (bool, time.Time, error) {
-	if lockName == "" || whoami == "" || desiredDuration == 0 {
-		panic("invalid lock parameters")
-	}
-
-	desiredLockedUntil := time.Now().Add(desiredDuration)
-
-	defer monitoring.ObserveQueryTime("Lock", "update", time.Now())
-	result, err := tx.Exec(updateLock, lockName, whoami, desiredLockedUntil)
-	if err != nil {
-		return false, time.Time{}, util.HandleError("updateLock", err)
-	}
-
-	if numRows, err := result.RowsAffected(); err == nil {
-		// This is the only happy path.
-		return numRows > 0, desiredLockedUntil, nil
-	}
-
-	return false, time.Time{}, util.HandleError("updateLock", err)
-}
-
-func ReleaseLock(tx *sql.Tx, name, owner string) error {
-	if name == "" || owner == "" {
-		panic("invalid lock parameters")
-	}
-
-	defer monitoring.ObserveQueryTime("Unlock", "all", time.Now())
-	_, err := tx.Exec(removeLock, name, owner)
-	return err
-}
-
-// pruneLocks removes every expired locks from the database
-func PruneLocks(tx *sql.Tx) error {
-	defer monitoring.ObserveQueryTime("pruneLocks", "all", time.Now())
-
-	if r, err := tx.Exec(removeLockExpired, time.Now().UTC()); err != nil {
-		return util.HandleError("removeLockExpired", err)
-	} else if affected, err := r.RowsAffected(); err != nil {
-		return util.HandleError("removeLockExpired", err)
-	} else {
-		log.Debugf("Pruned %d Locks", affected)
-	}
-
-	return nil
-}
--- a/database/pgsql/lock/lock_test.go
+++ b/database/pgsql/lock/lock_test.go
@ -1,100 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package lock
-
-import (
-	"testing"
-	"time"
-
-	"github.com/coreos/clair/database/pgsql/testutil"
-	"github.com/stretchr/testify/require"
-)
-
-func TestAcquireLockReturnsExistingLockDuration(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "Lock")
-	defer cleanup()
-
-	acquired, originalExpiration, err := AcquireLock(tx, "test1", "owner1", time.Minute)
-	require.Nil(t, err)
-	require.True(t, acquired)
-
-	acquired2, expiration, err := AcquireLock(tx, "test1", "owner2", time.Hour)
-	require.Nil(t, err)
-	require.False(t, acquired2)
-	require.Equal(t, expiration, originalExpiration)
-}
-
-func TestLock(t *testing.T) {
-	db, cleanup := testutil.CreateTestDBWithFixture(t, "Lock")
-	defer cleanup()
-
-	tx, err := db.Begin()
-	if err != nil {
-		panic(err)
-	}
-
-	// Create a first lock.
-	l, _, err := AcquireLock(tx, "test1", "owner1", time.Minute)
-	require.Nil(t, err)
-	require.True(t, l)
-	tx = testutil.RestartTransaction(db, tx, true)
-
-	// lock again by itself, the previous lock is not expired yet.
-	l, _, err = AcquireLock(tx, "test1", "owner1", time.Minute)
-	require.Nil(t, err)
-	require.True(t, l)
-	tx = testutil.RestartTransaction(db, tx, false)
-
-	// Try to renew the same lock with another owner.
-	l, _, err = ExtendLock(tx, "test1", "owner2", time.Minute)
-	require.Nil(t, err)
-	require.False(t, l)
-	tx = testutil.RestartTransaction(db, tx, false)
-
-	l, _, err = AcquireLock(tx, "test1", "owner2", time.Minute)
-	require.Nil(t, err)
-	require.False(t, l)
-	tx = testutil.RestartTransaction(db, tx, false)
-
-	// Renew the lock.
-	l, _, err = ExtendLock(tx, "test1", "owner1", 2*time.Minute)
-	require.Nil(t, err)
-	require.True(t, l)
-	tx = testutil.RestartTransaction(db, tx, true)
-
-	// Unlock and then relock by someone else.
-	err = ReleaseLock(tx, "test1", "owner1")
-	require.Nil(t, err)
-	tx = testutil.RestartTransaction(db, tx, true)
-
-	l, _, err = AcquireLock(tx, "test1", "owner2", time.Minute)
-	require.Nil(t, err)
-	require.True(t, l)
-	tx = testutil.RestartTransaction(db, tx, true)
-
-	// Create a second lock which is actually already expired ...
-	l, _, err = AcquireLock(tx, "test2", "owner1", -time.Minute)
-	require.Nil(t, err)
-	require.True(t, l)
-	tx = testutil.RestartTransaction(db, tx, true)
-
-	// Take over the lock
-	l, _, err = AcquireLock(tx, "test2", "owner2", time.Minute)
-	require.Nil(t, err)
-	require.True(t, l)
-	tx = testutil.RestartTransaction(db, tx, true)
-
-	require.Nil(t, tx.Rollback())
-}
--- a/database/pgsql/lock_test.go
+++ b/database/pgsql/lock_test.go
@ -0,0 +1,93 @@
+// Copyright 2016 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLock(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "Lock", true)
+	defer datastore.Close()
+
+	var l bool
+	var et time.Time
+
+	// Create a first lock.
+	l, _, err := tx.Lock("test1", "owner1", time.Minute, false)
+	assert.Nil(t, err)
+	assert.True(t, l)
+	tx = restartSession(t, datastore, tx, true)
+
+	// lock again by itself, the previous lock is not expired yet.
+	l, _, err = tx.Lock("test1", "owner1", time.Minute, false)
+	assert.Nil(t, err)
+	assert.False(t, l)
+	tx = restartSession(t, datastore, tx, false)
+
+	// Try to renew the same lock with another owner.
+	l, _, err = tx.Lock("test1", "owner2", time.Minute, true)
+	assert.Nil(t, err)
+	assert.False(t, l)
+	tx = restartSession(t, datastore, tx, false)
+
+	l, _, err = tx.Lock("test1", "owner2", time.Minute, false)
+	assert.Nil(t, err)
+	assert.False(t, l)
+	tx = restartSession(t, datastore, tx, false)
+
+	// Renew the lock.
+	l, _, err = tx.Lock("test1", "owner1", 2*time.Minute, true)
+	assert.Nil(t, err)
+	assert.True(t, l)
+	tx = restartSession(t, datastore, tx, true)
+
+	// Unlock and then relock by someone else.
+	err = tx.Unlock("test1", "owner1")
+	assert.Nil(t, err)
+	tx = restartSession(t, datastore, tx, true)
+
+	l, et, err = tx.Lock("test1", "owner2", time.Minute, false)
+	assert.Nil(t, err)
+	assert.True(t, l)
+	tx = restartSession(t, datastore, tx, true)
+
+	// LockInfo
+	o, et2, ok, err := tx.FindLock("test1")
+	assert.True(t, ok)
+	assert.Nil(t, err)
+	assert.Equal(t, "owner2", o)
+	assert.Equal(t, et.Second(), et2.Second())
+	tx = restartSession(t, datastore, tx, true)
+
+	// Create a second lock which is actually already expired ...
+	l, _, err = tx.Lock("test2", "owner1", -time.Minute, false)
+	assert.Nil(t, err)
+	assert.True(t, l)
+	tx = restartSession(t, datastore, tx, true)
+
+	// Take over the lock
+	l, _, err = tx.Lock("test2", "owner2", time.Minute, false)
+	assert.Nil(t, err)
+	assert.True(t, l)
+	tx = restartSession(t, datastore, tx, true)
+
+	if !assert.Nil(t, tx.Rollback()) {
+		t.FailNow()
+	}
+}
--- a/database/pgsql/migrations/00001_initial_schema.go
+++ b/database/pgsql/migrations/00001_initial_schema.go
@ -14,17 +14,13 @@

 package migrations

-var (
-	// entities are the basic building blocks to relate the vulnerabilities with
-	// the ancestry.
-	entities = MigrationQuery{
-		Up: []string{
-			`CREATE TABLE IF NOT EXISTS feature_type (
-				id SERIAL PRIMARY KEY,
-				name TEXT NOT NULL UNIQUE);`,
-
-			`INSERT INTO feature_type(name) VALUES ('source'), ('binary')`,
+import "github.com/remind101/migrate"

+func init() {
+	RegisterMigration(migrate.Migration{
+		ID: 1,
+		Up: migrate.Queries([]string{
+			// namespaces
 			`CREATE TABLE IF NOT EXISTS namespace (
 		id SERIAL PRIMARY KEY,
 		name TEXT NULL,
@ -32,124 +28,93 @@ var (
 		UNIQUE (name, version_format));`,
 			`CREATE INDEX ON namespace(name);`,

+			// features
 			`CREATE TABLE IF NOT EXISTS feature (
 		id SERIAL PRIMARY KEY,
 		name TEXT NOT NULL,
 		version TEXT NOT NULL,
 		version_format TEXT NOT NULL,
-				type INT REFERENCES feature_type ON DELETE CASCADE,
-				UNIQUE (name, version, version_format, type));`,
+		UNIQUE (name, version, version_format));`,
 			`CREATE INDEX ON feature(name);`,

 			`CREATE TABLE IF NOT EXISTS namespaced_feature (
 		id SERIAL PRIMARY KEY,
-				namespace_id INT REFERENCES namespace ON DELETE CASCADE,
-				feature_id INT REFERENCES feature ON DELETE CASCADE,
+		namespace_id INT REFERENCES namespace,
+		feature_id INT REFERENCES feature,
 		UNIQUE (namespace_id, feature_id));`,
-		},
-		Down: []string{
-			`DROP TABLE IF EXISTS namespace, feature, namespaced_feature, feature_type CASCADE;`,
-		},
-	}

-	// detector is analysis extensions used by the worker.
-	detector = MigrationQuery{
-		Up: []string{
-			`CREATE TYPE detector_type AS ENUM ('namespace', 'feature');`,
-
-			`CREATE TABLE IF NOT EXISTS detector (
-				id SERIAL PRIMARY KEY,
-				name TEXT NOT NULL,
-				version TEXT NOT NULL,
-				dtype detector_type NOT NULL,
-				UNIQUE (name, version, dtype));`,
-		},
-		Down: []string{
-			`DROP TABLE IF EXISTS detector CASCADE;`,
-			`DROP TYPE IF EXISTS detector_type;`,
-		},
-	}
-
-	// layer contains all metadata and scanned features and namespaces.
-	layer = MigrationQuery{
-		Up: []string{
+			// layers
 			`CREATE TABLE IF NOT EXISTS layer(
 		id SERIAL PRIMARY KEY, 
 		hash TEXT NOT NULL UNIQUE);`,

-			`CREATE TABLE IF NOT EXISTS layer_detector(
-				id SERIAL PRIMARY KEY,
-				layer_id INT REFERENCES layer ON DELETE CASCADE,
-				detector_id INT REFERENCES detector ON DELETE CASCADE,
-				UNIQUE(layer_id, detector_id));`,
-			`CREATE INDEX ON layer_detector(layer_id);`,
-
 			`CREATE TABLE IF NOT EXISTS layer_feature (
 		id SERIAL PRIMARY KEY, 
 		layer_id INT REFERENCES layer ON DELETE CASCADE, 
 		feature_id INT REFERENCES feature ON DELETE CASCADE,
-				detector_id INT REFERENCES detector ON DELETE CASCADE,
-				namespace_id INT NULL REFERENCES namespace ON DELETE CASCADE,
-				UNIQUE (layer_id, feature_id, namespace_id));`,
+		UNIQUE (layer_id, feature_id));`,
 			`CREATE INDEX ON layer_feature(layer_id);`,

+			`CREATE TABLE IF NOT EXISTS layer_lister (
+		id SERIAL PRIMARY KEY, 
+		layer_id INT REFERENCES layer ON DELETE CASCADE,
+		lister TEXT NOT NULL,
+		UNIQUE (layer_id, lister));`,
+			`CREATE INDEX ON layer_lister(layer_id);`,
+
+			`CREATE TABLE IF NOT EXISTS layer_detector (
+		id SERIAL PRIMARY KEY, 
+		layer_id INT REFERENCES layer ON DELETE CASCADE,
+		detector TEXT,
+		UNIQUE (layer_id, detector));`,
+			`CREATE INDEX ON layer_detector(layer_id);`,
+
 			`CREATE TABLE IF NOT EXISTS layer_namespace (
 		id SERIAL PRIMARY KEY, 
 		layer_id INT REFERENCES layer ON DELETE CASCADE,
 		namespace_id INT REFERENCES namespace ON DELETE CASCADE,
-				detector_id INT REFERENCES detector ON DELETE CASCADE,
 		UNIQUE (layer_id, namespace_id));`,
 			`CREATE INDEX ON layer_namespace(layer_id);`,
-		},
-		Down: []string{
-			`DROP TABLE IF EXISTS layer, layer_detector, layer_feature, layer_namespace CASCADE;`,
-		},
-	}

-	// ancestry contains all meta information around scanned manifest and its
-	// layers.
-	ancestry = MigrationQuery{
-		Up: []string{
+			// ancestry
 			`CREATE TABLE IF NOT EXISTS ancestry (
 		id SERIAL PRIMARY KEY,
 		name TEXT NOT NULL UNIQUE);`,

 			`CREATE TABLE IF NOT EXISTS ancestry_layer (
 		id SERIAL PRIMARY KEY,
-				ancestry_id INT NOT NULL REFERENCES ancestry ON DELETE CASCADE,
+		ancestry_id INT REFERENCES ancestry ON DELETE CASCADE,
 		ancestry_index INT NOT NULL,
-				layer_id INT NOT NULL REFERENCES layer ON DELETE RESTRICT,
+		layer_id INT REFERENCES layer ON DELETE RESTRICT,
 		UNIQUE (ancestry_id, ancestry_index));`,
 			`CREATE INDEX ON ancestry_layer(ancestry_id);`,

-			`CREATE TABLE IF NOT EXISTS ancestry_feature(
+			`CREATE TABLE IF NOT EXISTS ancestry_feature (
 		id SERIAL PRIMARY KEY, 
-				ancestry_layer_id INT NOT NULL REFERENCES ancestry_layer ON DELETE CASCADE,
-				namespaced_feature_id INT NOT NULL REFERENCES namespaced_feature ON DELETE CASCADE,
-				feature_detector_id INT NOT NULL REFERENCES detector ON DELETE CASCADE,
-				namespace_detector_id INT REFERENCES detector ON DELETE CASCADE,
-				UNIQUE (ancestry_layer_id, namespaced_feature_id));`,
+		ancestry_id INT REFERENCES ancestry ON DELETE CASCADE, 
+		namespaced_feature_id INT REFERENCES namespaced_feature ON DELETE CASCADE,
+		UNIQUE (ancestry_id, namespaced_feature_id));`,

-			`CREATE TABLE IF NOT EXISTS ancestry_detector(
+			`CREATE TABLE IF NOT EXISTS ancestry_lister (
 		id SERIAL PRIMARY KEY,
-				ancestry_id INT NOT NULL REFERENCES ancestry ON DELETE CASCADE,
-				detector_id INT NOT NULL REFERENCES detector ON DELETE CASCADE,
-				UNIQUE(ancestry_id, detector_id));`,
+		ancestry_id INT REFERENCES ancestry ON DELETE CASCADE,
+		lister TEXT,
+		UNIQUE (ancestry_id, lister));`,
+			`CREATE INDEX ON ancestry_lister(ancestry_id);`,
+
+			`CREATE TABLE IF NOT EXISTS ancestry_detector (
+		id SERIAL PRIMARY KEY,
+		ancestry_id INT REFERENCES ancestry ON DELETE CASCADE,
+		detector TEXT,
+		UNIQUE (ancestry_id, detector));`,
 			`CREATE INDEX ON ancestry_detector(ancestry_id);`,
-		},
-		Down: []string{
-			`DROP TABLE IF EXISTS ancestry, ancestry_layer, ancestry_feature, ancestry_detector CASCADE;`,
-		},
-	}

-	// vulnerability contains the metadata and vulnerability affecting relation.
-	vulnerability = MigrationQuery{
-		Up: []string{
 			`CREATE TYPE severity AS ENUM ('Unknown', 'Negligible', 'Low', 'Medium', 'High', 'Critical', 'Defcon1');`,

+			// vulnerability
 			`CREATE TABLE IF NOT EXISTS vulnerability (
 		id SERIAL PRIMARY KEY,
-				namespace_id INT REFERENCES Namespace,
+		namespace_id INT NOT NULL REFERENCES Namespace,
 		name TEXT NOT NULL,
 		description TEXT NULL,
 		link TEXT NULL,
@ -160,18 +125,13 @@ var (
 			`CREATE INDEX ON vulnerability(namespace_id, name);`,
 			`CREATE INDEX ON vulnerability(namespace_id);`,

-			// vulnerability_affected_feature is a de-normalized table to store
-			// the affected features in a independent place other than the
-			// feature table to reduce table lock issue, and makes it easier for
-			// decoupling updater and the Clair main logic.
 			`CREATE TABLE IF NOT EXISTS vulnerability_affected_feature (
 		id SERIAL PRIMARY KEY, 
 		vulnerability_id INT NOT NULL REFERENCES vulnerability ON DELETE CASCADE,
 		feature_name TEXT NOT NULL,
-				feature_type INT NOT NULL REFERENCES feature_type ON DELETE CASCADE,
 		affected_version TEXT,
 		fixedin TEXT);`,
-			`CREATE INDEX ON vulnerability_affected_feature(vulnerability_id, feature_name, feature_type);`,
+			`CREATE INDEX ON vulnerability_affected_feature(vulnerability_id, feature_name);`,

 			`CREATE TABLE IF NOT EXISTS vulnerability_affected_namespaced_feature(
 		id SERIAL PRIMARY KEY,
@ -180,17 +140,7 @@ var (
 		added_by INT NOT NULL REFERENCES vulnerability_affected_feature ON DELETE CASCADE,
 		UNIQUE (vulnerability_id, namespaced_feature_id));`,
 			`CREATE INDEX ON vulnerability_affected_namespaced_feature(namespaced_feature_id);`,
-		},
-		Down: []string{
-			`DROP TABLE IF EXISTS vulnerability, vulnerability_affected_feature, vulnerability_affected_namespaced_feature CASCADE;`,
-			`DROP TYPE IF EXISTS severity;`,
-		},
-	}

-	// updaterLock is the lock to be used by updater to prevent multiple
-	// updaters running on the same vulnerability source.
-	updaterLock = MigrationQuery{
-		Up: []string{
 			`CREATE TABLE IF NOT EXISTS KeyValue (
 		id SERIAL PRIMARY KEY,
 		key TEXT NOT NULL UNIQUE,
@ -202,16 +152,8 @@ var (
 		owner VARCHAR(64) NOT NULL,
 		until TIMESTAMP WITH TIME ZONE);`,
 			`CREATE INDEX ON Lock (owner);`,
-		},
-		Down: []string{
-			`DROP TABLE IF EXISTS KeyValue, Lock CASCADE;`,
-		},
-	}

-	// notification is the vulnerability notification spawned by the
-	// vulnerability changes.
-	notification = MigrationQuery{
-		Up: []string{
+			// Notification
 			`CREATE TABLE IF NOT EXISTS Vulnerability_Notification (
 		id SERIAL PRIMARY KEY,
 		name VARCHAR(64) NOT NULL UNIQUE,
@ -221,22 +163,30 @@ var (
 		old_vulnerability_id INT NULL REFERENCES Vulnerability ON DELETE CASCADE,
 		new_vulnerability_id INT NULL REFERENCES Vulnerability ON DELETE CASCADE);`,
 			`CREATE INDEX ON Vulnerability_Notification (notified_at);`,
-		},
-		Down: []string{
-			`DROP TABLE IF EXISTS Vulnerability_Notification CASCADE;`,
-		},
-	}
-)
-
-func init() {
-	RegisterMigration(NewSimpleMigration(1,
-		[]MigrationQuery{
-			entities,
-			detector,
-			layer,
+		}),
+		Down: migrate.Queries([]string{
+			`DROP TABLE IF EXISTS
 		ancestry,
+		ancestry_layer,
+		ancestry_feature,
+		ancestry_detector,
+		ancestry_lister,
+		feature,
+		namespaced_feature,
+		keyvalue,
+		layer,
+		layer_detector,
+		layer_feature,
+		layer_lister,
+		layer_namespace,
+		lock,
+		namespace,
 		vulnerability,
-			updaterLock,
-			notification,
-		}))
+		vulnerability_affected_feature,
+		vulnerability_affected_namespaced_feature,
+		vulnerability_notification
+		CASCADE;`,
+			`DROP TYPE IF EXISTS severity;`,
+		}),
+	})
 }
--- a/database/pgsql/migrations/migrations_test.go
+++ b/database/pgsql/migrations/migrations_test.go
@ -1,60 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package migrations_test
-
-import (
-	"testing"
-
-	"github.com/coreos/clair/database/pgsql/migrations"
-	"github.com/coreos/clair/database/pgsql/testutil"
-	_ "github.com/lib/pq"
-	"github.com/remind101/migrate"
-	"github.com/stretchr/testify/require"
-)
-
-var userTableCount = `SELECT tablename FROM pg_catalog.pg_tables WHERE schemaname='public'`
-
-func TestMigration(t *testing.T) {
-	db, cleanup := testutil.CreateAndConnectTestDB(t, "TestMigration")
-	defer cleanup()
-
-	err := migrate.NewPostgresMigrator(db).Exec(migrate.Up, migrations.Migrations...)
-	if err != nil {
-		require.Nil(t, err, err.Error())
-	}
-
-	err = migrate.NewPostgresMigrator(db).Exec(migrate.Down, migrations.Migrations...)
-	if err != nil {
-		require.Nil(t, err, err.Error())
-	}
-
-	rows, err := db.Query(userTableCount)
-	if err != nil {
-		panic(err)
-	}
-
-	var (
-		tables []string
-		table  string
-	)
-	for rows.Next() {
-		if err = rows.Scan(&table); err != nil {
-			panic(err)
-		}
-		tables = append(tables, table)
-	}
-
-	require.True(t, len(tables) == 1 && tables[0] == "schema_migrations", "Only `schema_migrations` should be left")
-}
--- a/database/pgsql/migrations/util.go
+++ b/database/pgsql/migrations/util.go
@ -1,44 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package migrations
-
-import "github.com/remind101/migrate"
-
-// MigrationQuery contains the Up migration and Down migration in Plain strings.
-type MigrationQuery struct {
-	Up   []string
-	Down []string
-}
-
-// ConcatMigrationQueries concats migration queries in the give order.
-func ConcatMigrationQueries(qs []MigrationQuery) MigrationQuery {
-	r := MigrationQuery{}
-	for _, q := range qs {
-		r.Up = append(r.Up, q.Up...)
-		r.Down = append(r.Down, q.Down...)
-	}
-	return r
-}
-
-// NewSimpleMigration returns a simple migration plan with all provided
-// migration queries concatted in order.
-func NewSimpleMigration(id int, qs []MigrationQuery) migrate.Migration {
-	q := ConcatMigrationQueries(qs)
-	return migrate.Migration{
-		ID:   id,
-		Up:   migrate.Queries(q.Up),
-		Down: migrate.Queries(q.Down),
-	}
-}
--- a/database/pgsql/monitoring/prometheus.go
+++ b/database/pgsql/monitoring/prometheus.go
@ -1,67 +0,0 @@
-// Copyright 2019 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package monitoring
-
-import (
-	"time"
-
-	"github.com/prometheus/client_golang/prometheus"
-)
-
-var (
-	PromErrorsTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Name: "clair_pgsql_errors_total",
-		Help: "Number of errors that PostgreSQL requests generated.",
-	}, []string{"request"})
-
-	PromCacheHitsTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Name: "clair_pgsql_cache_hits_total",
-		Help: "Number of cache hits that the PostgreSQL backend did.",
-	}, []string{"object"})
-
-	PromCacheQueriesTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Name: "clair_pgsql_cache_queries_total",
-		Help: "Number of cache queries that the PostgreSQL backend did.",
-	}, []string{"object"})
-
-	PromQueryDurationMilliseconds = prometheus.NewHistogramVec(prometheus.HistogramOpts{
-		Name: "clair_pgsql_query_duration_milliseconds",
-		Help: "Time it takes to execute the database query.",
-	}, []string{"query", "subquery"})
-
-	PromConcurrentLockVAFV = prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: "clair_pgsql_concurrent_lock_vafv_total",
-		Help: "Number of transactions trying to hold the exclusive Vulnerability_Affects_Feature lock.",
-	})
-)
-
-func init() {
-	prometheus.MustRegister(PromErrorsTotal)
-	prometheus.MustRegister(PromCacheHitsTotal)
-	prometheus.MustRegister(PromCacheQueriesTotal)
-	prometheus.MustRegister(PromQueryDurationMilliseconds)
-	prometheus.MustRegister(PromConcurrentLockVAFV)
-}
-
-// monitoring.ObserveQueryTime computes the time elapsed since `start` to represent the
-// query time.
-// 1. `query` is a pgSession function name.
-// 2. `subquery` is a specific query or a batched query.
-// 3. `start` is the time right before query is executed.
-func ObserveQueryTime(query, subquery string, start time.Time) {
-	PromQueryDurationMilliseconds.
-		WithLabelValues(query, subquery).
-		Observe(float64(time.Since(start).Nanoseconds()) / float64(time.Millisecond))
-}
--- a/database/pgsql/namespace/namespace.go
+++ b/database/pgsql/namespace/namespace.go
@ -12,40 +12,23 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.

-package namespace
+package pgsql

 import (
 	"database/sql"
-	"fmt"
+	"errors"
 	"sort"

 	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/util"
 	"github.com/coreos/clair/pkg/commonerr"
 )

-const (
-	searchNamespaceID = `SELECT id FROM Namespace WHERE name = $1 AND version_format = $2`
+var (
+	errNamespaceNotFound = errors.New("Requested Namespace is not in database")
 )

-func queryPersistNamespace(count int) string {
-	return util.QueryPersist(count,
-		"namespace",
-		"namespace_name_version_format_key",
-		"name",
-		"version_format")
-}
-
-func querySearchNamespace(nsCount int) string {
-	return fmt.Sprintf(
-		`SELECT id, name, version_format 
-		FROM namespace WHERE (name, version_format) IN (%s)`,
-		util.QueryString(2, nsCount),
-	)
-}
-
 // PersistNamespaces soi namespaces into database.
-func PersistNamespaces(tx *sql.Tx, namespaces []database.Namespace) error {
+func (tx *pgSession) PersistNamespaces(namespaces []database.Namespace) error {
 	if len(namespaces) == 0 {
 		return nil
 	}
@ -67,12 +50,12 @@ func PersistNamespaces(tx *sql.Tx, namespaces []database.Namespace) error {

 	_, err := tx.Exec(queryPersistNamespace(len(namespaces)), keys...)
 	if err != nil {
-		return util.HandleError("queryPersistNamespace", err)
+		return handleError("queryPersistNamespace", err)
 	}
 	return nil
 }

-func FindNamespaceIDs(tx *sql.Tx, namespaces []database.Namespace) ([]sql.NullInt64, error) {
+func (tx *pgSession) findNamespaceIDs(namespaces []database.Namespace) ([]sql.NullInt64, error) {
 	if len(namespaces) == 0 {
 		return nil, nil
 	}
@ -87,7 +70,7 @@ func FindNamespaceIDs(tx *sql.Tx, namespaces []database.Namespace) ([]sql.NullIn

 	rows, err := tx.Query(querySearchNamespace(len(namespaces)), keys...)
 	if err != nil {
-		return nil, util.HandleError("searchNamespace", err)
+		return nil, handleError("searchNamespace", err)
 	}

 	defer rows.Close()
@ -99,7 +82,7 @@ func FindNamespaceIDs(tx *sql.Tx, namespaces []database.Namespace) ([]sql.NullIn
 	for rows.Next() {
 		err := rows.Scan(&id, &ns.Name, &ns.VersionFormat)
 		if err != nil {
-			return nil, util.HandleError("searchNamespace", err)
+			return nil, handleError("searchNamespace", err)
 		}
 		nsMap[ns] = id
 	}
--- a/database/pgsql/namespace/namespace_test.go
+++ b/database/pgsql/namespace/namespace_test.go
@ -1,45 +0,0 @@
-// Copyright 2016 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package namespace
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/testutil"
-)
-
-func TestPersistNamespaces(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTx(t, "PersistNamespaces")
-	defer cleanup()
-
-	ns1 := database.Namespace{}
-	ns2 := database.Namespace{Name: "t", VersionFormat: "b"}
-
-	// Empty Case
-	assert.Nil(t, PersistNamespaces(tx, []database.Namespace{}))
-	// Invalid Case
-	assert.NotNil(t, PersistNamespaces(tx, []database.Namespace{ns1}))
-	// Duplicated Case
-	assert.Nil(t, PersistNamespaces(tx, []database.Namespace{ns2, ns2}))
-	// Existing Case
-	assert.Nil(t, PersistNamespaces(tx, []database.Namespace{ns2}))
-
-	nsList := testutil.ListNamespaces(t, tx)
-	assert.Len(t, nsList, 1)
-	assert.Equal(t, ns2, nsList[0])
-}
--- a/database/pgsql/namespace_test.go
+++ b/database/pgsql/namespace_test.go
@ -0,0 +1,83 @@
+// Copyright 2016 clair authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pgsql
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/coreos/clair/database"
+)
+
+func TestPersistNamespaces(t *testing.T) {
+	datastore, tx := openSessionForTest(t, "PersistNamespaces", false)
+	defer closeTest(t, datastore, tx)
+
+	ns1 := database.Namespace{}
+	ns2 := database.Namespace{Name: "t", VersionFormat: "b"}
+
+	// Empty Case
+	assert.Nil(t, tx.PersistNamespaces([]database.Namespace{}))
+	// Invalid Case
+	assert.NotNil(t, tx.PersistNamespaces([]database.Namespace{ns1}))
+	// Duplicated Case
+	assert.Nil(t, tx.PersistNamespaces([]database.Namespace{ns2, ns2}))
+	// Existing Case
+	assert.Nil(t, tx.PersistNamespaces([]database.Namespace{ns2}))
+
+	nsList := listNamespaces(t, tx)
+	assert.Len(t, nsList, 1)
+	assert.Equal(t, ns2, nsList[0])
+}
+
+func assertNamespacesEqual(t *testing.T, expected []database.Namespace, actual []database.Namespace) bool {
+	if assert.Len(t, actual, len(expected)) {
+		has := map[database.Namespace]bool{}
+		for _, i := range expected {
+			has[i] = false
+		}
+		for _, i := range actual {
+			has[i] = true
+		}
+		for key, v := range has {
+			if !assert.True(t, v, key.Name+"is expected") {
+				return false
+			}
+		}
+		return true
+	}
+	return false
+}
+
+func listNamespaces(t *testing.T, tx *pgSession) []database.Namespace {
+	rows, err := tx.Query("SELECT name, version_format FROM namespace")
+	if err != nil {
+		t.FailNow()
+	}
+	defer rows.Close()
+
+	namespaces := []database.Namespace{}
+	for rows.Next() {
+		var ns database.Namespace
+		err := rows.Scan(&ns.Name, &ns.VersionFormat)
+		if err != nil {
+			t.FailNow()
+		}
+		namespaces = append(namespaces, ns)
+	}
+
+	return namespaces
+}
--- a/database/pgsql/notification/vulnerability_notification.go
+++ b/database/pgsql/notification/vulnerability_notification.go
@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.

-package notification
+package pgsql

 import (
 	"database/sql"
@ -22,58 +22,14 @@ import (
 	"github.com/guregu/null/zero"

 	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/util"
-	"github.com/coreos/clair/database/pgsql/vulnerability"
 	"github.com/coreos/clair/pkg/commonerr"
-	"github.com/coreos/clair/pkg/pagination"
 )

-const (
-	insertNotification = `
-		INSERT INTO Vulnerability_Notification(name, created_at, old_vulnerability_id, new_vulnerability_id)
-		VALUES ($1, $2, $3, $4)`
-
-	updatedNotificationAsRead = `
-		UPDATE Vulnerability_Notification
-		SET notified_at = CURRENT_TIMESTAMP
-		WHERE name = $1`
-
-	removeNotification = `
-		UPDATE Vulnerability_Notification
-	  SET deleted_at = CURRENT_TIMESTAMP
-	  WHERE name = $1 AND deleted_at IS NULL`
-
-	searchNotificationAvailable = `
-		SELECT name, created_at, notified_at, deleted_at
-		FROM Vulnerability_Notification
-		WHERE (notified_at IS NULL OR notified_at < $1)
-					AND deleted_at IS NULL
-					AND name NOT IN (SELECT name FROM Lock)
-		ORDER BY Random()
-		LIMIT 1`
-
-	searchNotification = `
-		SELECT created_at, notified_at, deleted_at, old_vulnerability_id, new_vulnerability_id
-		FROM Vulnerability_Notification
-		WHERE name = $1`
-)
-
-func queryInsertNotifications(count int) string {
-	return util.QueryInsert(count,
-		"vulnerability_notification",
-		"name",
-		"created_at",
-		"old_vulnerability_id",
-		"new_vulnerability_id",
-	)
-}
-
 var (
 	errNotificationNotFound = errors.New("requested notification is not found")
-	errVulnerabilityNotFound = errors.New("vulnerability is not in database")
 )

-func InsertVulnerabilityNotifications(tx *sql.Tx, notifications []database.VulnerabilityNotification) error {
+func (tx *pgSession) InsertVulnerabilityNotifications(notifications []database.VulnerabilityNotification) error {
 	if len(notifications) == 0 {
 		return nil
 	}
@ -122,26 +78,26 @@ func InsertVulnerabilityNotifications(tx *sql.Tx, notifications []database.Vulne
 		oldVulnIDs = append(oldVulnIDs, vulnID)
 	}

-	ids, err := vulnerability.FindNotDeletedVulnerabilityIDs(tx, newVulnIDs)
+	ids, err := tx.findNotDeletedVulnerabilityIDs(newVulnIDs)
 	if err != nil {
 		return err
 	}

 	for i, id := range ids {
 		if !id.Valid {
-			return util.HandleError("findNotDeletedVulnerabilityIDs", errVulnerabilityNotFound)
+			return handleError("findNotDeletedVulnerabilityIDs", errVulnerabilityNotFound)
 		}
 		newVulnIDMap[newVulnIDs[i]] = id
 	}

-	ids, err = vulnerability.FindLatestDeletedVulnerabilityIDs(tx, oldVulnIDs)
+	ids, err = tx.findLatestDeletedVulnerabilityIDs(oldVulnIDs)
 	if err != nil {
 		return err
 	}

 	for i, id := range ids {
 		if !id.Valid {
-			return util.HandleError("findLatestDeletedVulnerabilityIDs", errVulnerabilityNotFound)
+			return handleError("findLatestDeletedVulnerabilityIDs", errVulnerabilityNotFound)
 		}
 		oldVulnIDMap[oldVulnIDs[i]] = id
 	}
@ -178,13 +134,13 @@ func InsertVulnerabilityNotifications(tx *sql.Tx, notifications []database.Vulne
 	// multiple updaters, deadlock may happen.
 	_, err = tx.Exec(queryInsertNotifications(len(notifications)), keys...)
 	if err != nil {
-		return util.HandleError("queryInsertNotifications", err)
+		return handleError("queryInsertNotifications", err)
 	}

 	return nil
 }

-func FindNewNotification(tx *sql.Tx, notifiedBefore time.Time) (database.NotificationHook, bool, error) {
+func (tx *pgSession) FindNewNotification(notifiedBefore time.Time) (database.NotificationHook, bool, error) {
 	var (
 		notification database.NotificationHook
 		created      zero.Time
@ -197,7 +153,7 @@ func FindNewNotification(tx *sql.Tx, notifiedBefore time.Time) (database.Notific
 		if err == sql.ErrNoRows {
 			return notification, false, nil
 		}
-		return notification, false, util.HandleError("searchNotificationAvailable", err)
+		return notification, false, handleError("searchNotificationAvailable", err)
 	}

 	notification.Created = created.Time
@ -207,7 +163,78 @@ func FindNewNotification(tx *sql.Tx, notifiedBefore time.Time) (database.Notific
 	return notification, true, nil
 }

-func FindVulnerabilityNotification(tx *sql.Tx, name string, limit int, oldPageToken pagination.Token, newPageToken pagination.Token, key pagination.Key) (
+func (tx *pgSession) findPagedVulnerableAncestries(vulnID int64, limit int, currentPage database.PageNumber) (database.PagedVulnerableAncestries, error) {
+	vulnPage := database.PagedVulnerableAncestries{Limit: limit}
+	current := idPageNumber{0}
+	if currentPage != "" {
+		var err error
+		current, err = decryptPage(currentPage, tx.paginationKey)
+		if err != nil {
+			return vulnPage, err
+		}
+	}
+
+	err := tx.QueryRow(searchVulnerabilityByID, vulnID).Scan(
+		&vulnPage.Name,
+		&vulnPage.Description,
+		&vulnPage.Link,
+		&vulnPage.Severity,
+		&vulnPage.Metadata,
+		&vulnPage.Namespace.Name,
+		&vulnPage.Namespace.VersionFormat,
+	)
+	if err != nil {
+		return vulnPage, handleError("searchVulnerabilityByID", err)
+	}
+
+	// the last result is used for the next page's startID
+	rows, err := tx.Query(searchNotificationVulnerableAncestry, vulnID, current.StartID, limit+1)
+	if err != nil {
+		return vulnPage, handleError("searchNotificationVulnerableAncestry", err)
+	}
+	defer rows.Close()
+
+	ancestries := []affectedAncestry{}
+	for rows.Next() {
+		var ancestry affectedAncestry
+		err := rows.Scan(&ancestry.id, &ancestry.name)
+		if err != nil {
+			return vulnPage, handleError("searchNotificationVulnerableAncestry", err)
+		}
+		ancestries = append(ancestries, ancestry)
+	}
+
+	lastIndex := 0
+	if len(ancestries)-1 < limit {
+		lastIndex = len(ancestries)
+		vulnPage.End = true
+	} else {
+		// Use the last ancestry's ID as the next PageNumber.
+		lastIndex = len(ancestries) - 1
+		vulnPage.Next, err = encryptPage(
+			idPageNumber{
+				ancestries[len(ancestries)-1].id,
+			}, tx.paginationKey)
+
+		if err != nil {
+			return vulnPage, err
+		}
+	}
+
+	vulnPage.Affected = map[int]string{}
+	for _, ancestry := range ancestries[0:lastIndex] {
+		vulnPage.Affected[int(ancestry.id)] = ancestry.name
+	}
+
+	vulnPage.Current, err = encryptPage(current, tx.paginationKey)
+	if err != nil {
+		return vulnPage, err
+	}
+
+	return vulnPage, nil
+}
+
+func (tx *pgSession) FindVulnerabilityNotification(name string, limit int, oldPage database.PageNumber, newPage database.PageNumber) (
 	database.VulnerabilityNotificationWithVulnerable, bool, error) {
 	var (
 		noti      database.VulnerabilityNotificationWithVulnerable
@ -223,6 +250,7 @@ func FindVulnerabilityNotification(tx *sql.Tx, name string, limit int, oldPageTo
 	}

 	noti.Name = name
+
 	err := tx.QueryRow(searchNotification, name).Scan(&created, &notified,
 		&deleted, &oldVulnID, &newVulnID)

@ -230,7 +258,7 @@ func FindVulnerabilityNotification(tx *sql.Tx, name string, limit int, oldPageTo
 		if err == sql.ErrNoRows {
 			return noti, false, nil
 		}
-		return noti, false, util.HandleError("searchNotification", err)
+		return noti, false, handleError("searchNotification", err)
 	}

 	if created.Valid {
@ -246,7 +274,7 @@ func FindVulnerabilityNotification(tx *sql.Tx, name string, limit int, oldPageTo
 	}

 	if oldVulnID.Valid {
-		page, err := vulnerability.FindPagedVulnerableAncestries(tx, oldVulnID.Int64, limit, oldPageToken, key)
+		page, err := tx.findPagedVulnerableAncestries(oldVulnID.Int64, limit, oldPage)
 		if err != nil {
 			return noti, false, err
 		}
@ -254,7 +282,7 @@ func FindVulnerabilityNotification(tx *sql.Tx, name string, limit int, oldPageTo
 	}

 	if newVulnID.Valid {
-		page, err := vulnerability.FindPagedVulnerableAncestries(tx, newVulnID.Int64, limit, newPageToken, key)
+		page, err := tx.findPagedVulnerableAncestries(newVulnID.Int64, limit, newPage)
 		if err != nil {
 			return noti, false, err
 		}
@ -264,44 +292,44 @@ func FindVulnerabilityNotification(tx *sql.Tx, name string, limit int, oldPageTo
 	return noti, true, nil
 }

-func MarkNotificationAsRead(tx *sql.Tx, name string) error {
+func (tx *pgSession) MarkNotificationNotified(name string) error {
 	if name == "" {
 		return commonerr.NewBadRequestError("Empty notification name is not allowed")
 	}

-	r, err := tx.Exec(updatedNotificationAsRead, name)
+	r, err := tx.Exec(updatedNotificationNotified, name)
 	if err != nil {
-		return util.HandleError("updatedNotificationAsRead", err)
+		return handleError("updatedNotificationNotified", err)
 	}

 	affected, err := r.RowsAffected()
 	if err != nil {
-		return util.HandleError("updatedNotificationAsRead", err)
+		return handleError("updatedNotificationNotified", err)
 	}

 	if affected <= 0 {
-		return util.HandleError("updatedNotificationAsRead", errNotificationNotFound)
+		return handleError("updatedNotificationNotified", errNotificationNotFound)
 	}
 	return nil
 }

-func DeleteNotification(tx *sql.Tx, name string) error {
+func (tx *pgSession) DeleteNotification(name string) error {
 	if name == "" {
 		return commonerr.NewBadRequestError("Empty notification name is not allowed")
 	}

 	result, err := tx.Exec(removeNotification, name)
 	if err != nil {
-		return util.HandleError("removeNotification", err)
+		return handleError("removeNotification", err)
 	}

 	affected, err := result.RowsAffected()
 	if err != nil {
-		return util.HandleError("removeNotification", err)
+		return handleError("removeNotification", err)
 	}

 	if affected <= 0 {
-		return util.HandleError("removeNotification", commonerr.ErrNotFound)
+		return handleError("removeNotification", commonerr.ErrNotFound)
 	}

 	return nil
--- a/database/pgsql/notification/notification_test.go
+++ b/database/pgsql/notification/notification_test.go
@ -1,280 +0,0 @@
-// Copyright 2018 clair authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package notification
-
-import (
-	"testing"
-	"time"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"github.com/coreos/clair/database"
-	"github.com/coreos/clair/database/pgsql/page"
-	"github.com/coreos/clair/database/pgsql/testutil"
-	"github.com/coreos/clair/pkg/pagination"
-)
-
-type findVulnerabilityNotificationIn struct {
-	notificationName        string
-	pageSize                int
-	oldAffectedAncestryPage pagination.Token
-	newAffectedAncestryPage pagination.Token
-}
-
-type findVulnerabilityNotificationOut struct {
-	notification *database.VulnerabilityNotificationWithVulnerable
-	ok           bool
-	err          string
-}
-
-var testPaginationKey = pagination.Must(pagination.NewKey())
-
-var findVulnerabilityNotificationTests = []struct {
-	title string
-	in    findVulnerabilityNotificationIn
-	out   findVulnerabilityNotificationOut
-}{
-	{
-		title: "find notification with invalid page",
-		in: findVulnerabilityNotificationIn{
-			notificationName:        "test",
-			pageSize:                1,
-			oldAffectedAncestryPage: pagination.FirstPageToken,
-			newAffectedAncestryPage: pagination.Token("random non sense"),
-		},
-		out: findVulnerabilityNotificationOut{
-			err: pagination.ErrInvalidToken.Error(),
-		},
-	},
-	{
-		title: "find non-existing notification",
-		in: findVulnerabilityNotificationIn{
-			notificationName:        "non-existing",
-			pageSize:                1,
-			oldAffectedAncestryPage: pagination.FirstPageToken,
-			newAffectedAncestryPage: pagination.FirstPageToken,
-		},
-		out: findVulnerabilityNotificationOut{
-			ok: false,
-		},
-	},
-	{
-		title: "find existing notification first page",
-		in: findVulnerabilityNotificationIn{
-			notificationName:        "test",
-			pageSize:                1,
-			oldAffectedAncestryPage: pagination.FirstPageToken,
-			newAffectedAncestryPage: pagination.FirstPageToken,
-		},
-		out: findVulnerabilityNotificationOut{
-			&database.VulnerabilityNotificationWithVulnerable{
-				NotificationHook: testutil.RealNotification[1].NotificationHook,
-				Old: &database.PagedVulnerableAncestries{
-					Vulnerability: testutil.RealVulnerability[2],
-					Limit:         1,
-					Affected:      make(map[int]string),
-					Current:       testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{0}),
-					Next:          testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{0}),
-					End:           true,
-				},
-				New: &database.PagedVulnerableAncestries{
-					Vulnerability: testutil.RealVulnerability[1],
-					Limit:         1,
-					Affected:      map[int]string{3: "ancestry-3"},
-					Current:       testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{0}),
-					Next:          testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{4}),
-					End:           false,
-				},
-			},
-
-			true,
-			"",
-		},
-	},
-	{
-		title: "find existing notification of second page of new affected ancestry",
-		in: findVulnerabilityNotificationIn{
-			notificationName:        "test",
-			pageSize:                1,
-			oldAffectedAncestryPage: pagination.FirstPageToken,
-			newAffectedAncestryPage: testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{4}),
-		},
-		out: findVulnerabilityNotificationOut{
-			&database.VulnerabilityNotificationWithVulnerable{
-				NotificationHook: testutil.RealNotification[1].NotificationHook,
-				Old: &database.PagedVulnerableAncestries{
-					Vulnerability: testutil.RealVulnerability[2],
-					Limit:         1,
-					Affected:      make(map[int]string),
-					Current:       testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{0}),
-					Next:          testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{0}),
-					End:           true,
-				},
-				New: &database.PagedVulnerableAncestries{
-					Vulnerability: testutil.RealVulnerability[1],
-					Limit:         1,
-					Affected:      map[int]string{4: "ancestry-4"},
-					Current:       testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{4}),
-					Next:          testutil.MustMarshalToken(testutil.TestPaginationKey, page.Page{0}),
-					End:           true,
-				},
-			},
-
-			true,
-			"",
-		},
-	},
-}
-
-func TestFindVulnerabilityNotification(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "pagination")
-	defer cleanup()
-
-	for _, test := range findVulnerabilityNotificationTests {
-		t.Run(test.title, func(t *testing.T) {
-			notification, ok, err := FindVulnerabilityNotification(tx, test.in.notificationName, test.in.pageSize, test.in.oldAffectedAncestryPage, test.in.newAffectedAncestryPage, testutil.TestPaginationKey)
-			if test.out.err != "" {
-				require.EqualError(t, err, test.out.err)
-				return
-			}
-
-			require.Nil(t, err)
-			if !test.out.ok {
-				require.Equal(t, test.out.ok, ok)
-				return
-			}
-
-			require.True(t, ok)
-			testutil.AssertVulnerabilityNotificationWithVulnerableEqual(t, testutil.TestPaginationKey, test.out.notification, &notification)
-		})
-	}
-}
-
-func TestInsertVulnerabilityNotifications(t *testing.T) {
-	datastore, cleanup := testutil.CreateTestDBWithFixture(t, "InsertVulnerabilityNotifications")
-	defer cleanup()
-
-	n1 := database.VulnerabilityNotification{}
-	n3 := database.VulnerabilityNotification{
-		NotificationHook: database.NotificationHook{
-			Name:    "random name",
-			Created: time.Now(),
-		},
-		Old: nil,
-		New: &database.Vulnerability{},
-	}
-	n4 := database.VulnerabilityNotification{
-		NotificationHook: database.NotificationHook{
-			Name:    "random name",
-			Created: time.Now(),
-		},
-		Old: nil,
-		New: &database.Vulnerability{
-			Name: "CVE-OPENSSL-1-DEB7",
-			Namespace: database.Namespace{
-				Name:          "debian:7",
-				VersionFormat: "dpkg",
-			},
-		},
-	}
-
-	tx, err := datastore.Begin()
-	require.Nil(t, err)
-
-	// invalid case
-	err = InsertVulnerabilityNotifications(tx, []database.VulnerabilityNotification{n1})
-	require.NotNil(t, err)
-
-	// invalid case: unknown vulnerability
-	err = InsertVulnerabilityNotifications(tx, []database.VulnerabilityNotification{n3})
-	require.NotNil(t, err)
-
-	// invalid case: duplicated input notification
-	err = InsertVulnerabilityNotifications(tx, []database.VulnerabilityNotification{n4, n4})
-	require.NotNil(t, err)
-	tx = testutil.RestartTransaction(datastore, tx, false)
-
-	// valid case
-	err = InsertVulnerabilityNotifications(tx, []database.VulnerabilityNotification{n4})
-	require.Nil(t, err)
-	// invalid case: notification is already in database
-	err = InsertVulnerabilityNotifications(tx, []database.VulnerabilityNotification{n4})
-	require.NotNil(t, err)
-
-	require.Nil(t, tx.Rollback())
-}
-
-func TestFindNewNotification(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "TestFindNewNotification")
-	defer cleanup()
-
-	noti, ok, err := FindNewNotification(tx, time.Now())
-	if assert.Nil(t, err) && assert.True(t, ok) {
-		assert.Equal(t, "test", noti.Name)
-		assert.Equal(t, time.Time{}, noti.Notified)
-		assert.Equal(t, time.Time{}, noti.Created)
-		assert.Equal(t, time.Time{}, noti.Deleted)
-	}
-
-	// can't find the notified
-	assert.Nil(t, MarkNotificationAsRead(tx, "test"))
-	// if the notified time is before
-	noti, ok, err = FindNewNotification(tx, time.Now().Add(-time.Duration(10*time.Second)))
-	assert.Nil(t, err)
-	assert.False(t, ok)
-	// can find the notified after a period of time
-	noti, ok, err = FindNewNotification(tx, time.Now().Add(time.Duration(10*time.Second)))
-	if assert.Nil(t, err) && assert.True(t, ok) {
-		assert.Equal(t, "test", noti.Name)
-		assert.NotEqual(t, time.Time{}, noti.Notified)
-		assert.Equal(t, time.Time{}, noti.Created)
-		assert.Equal(t, time.Time{}, noti.Deleted)
-	}
-
-	assert.Nil(t, DeleteNotification(tx, "test"))
-	// can't find in any time
-	noti, ok, err = FindNewNotification(tx, time.Now().Add(-time.Duration(1000)))
-	assert.Nil(t, err)
-	assert.False(t, ok)
-
-	noti, ok, err = FindNewNotification(tx, time.Now().Add(time.Duration(1000)))
-	assert.Nil(t, err)
-	assert.False(t, ok)
-}
-
-func TestMarkNotificationAsRead(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "MarkNotificationAsRead")
-	defer cleanup()
-
-	// invalid case: notification doesn't exist
-	assert.NotNil(t, MarkNotificationAsRead(tx, "non-existing"))
-	// valid case
-	assert.Nil(t, MarkNotificationAsRead(tx, "test"))
-	// valid case
-	assert.Nil(t, MarkNotificationAsRead(tx, "test"))
-}
-
-func TestDeleteNotification(t *testing.T) {
-	tx, cleanup := testutil.CreateTestTxWithFixtures(t, "DeleteNotification")
-	defer cleanup()
-
-	// invalid case: notification doesn't exist
-	assert.NotNil(t, DeleteNotification(tx, "non-existing"))
-	// valid case
-	assert.Nil(t, DeleteNotification(tx, "test"))
-	// invalid case: notification is already deleted
-	assert.NotNil(t, DeleteNotification(tx, "test"))
-}
--- a/Show More
+++ b/Show More