database: add created_at field for layers and vulnerabilities

database/pgsql/migrations/20151222113213_Initial.sql

@@ -30,7 +30,8 @@ CREATE TABLE IF NOT EXISTS Layer (
   name VARCHAR(128) NOT NULL UNIQUE,
   engineversion SMALLINT NOT NULL,
   parent_id INT NULL REFERENCES Layer ON DELETE CASCADE,
-  namespace_id INT NULL REFERENCES Namespace);
+  namespace_id INT NULL REFERENCES Namespace,
+  created_at TIMESTAMP WITH TIME ZONE);
 
 CREATE INDEX ON Layer (parent_id);
 CREATE INDEX ON Layer (namespace_id);

database/pgsql/queries.go

@@ -115,8 +115,9 @@ func init() {
           AND v.deleted_at IS NULL`
 
 	queries["i_layer"] = `
-    INSERT INTO Layer(name, engineversion, parent_id, namespace_id)
-    VALUES($1, $2, $3, $4) RETURNING id`
+    INSERT INTO Layer(name, engineversion, parent_id, namespace_id, created_at)
+    VALUES($1, $2, $3, $4, CURRENT_TIMESTAMP)
+    RETURNING id`
 
 	queries["u_layer"] = `UPDATE LAYER SET engineversion = $2, namespace_id = $3 WHERE id = $1`
 
@@ -158,8 +159,8 @@ func init() {
     WHERE vfif.vulnerability_id = $1`
 
 	queries["i_vulnerability"] = `
-    INSERT INTO Vulnerability(namespace_id, name, description, link, severity, metadata)
-    VALUES($1, $2, $3, $4, $5, $6)
+    INSERT INTO Vulnerability(namespace_id, name, description, link, severity, metadata, created_at)
+    VALUES($1, $2, $3, $4, $5, $6, CURRENT_TIMESTAMP)
     RETURNING id`
 
 	queries["i_vulnerability_fixedin_feature"] = `