Update view vw_gravity to only return domains from enabled adlists.

Signed-off-by: DL6ER <dl6er@dl6er.de>

advanced/Scripts/database_migration/gravity-db.sh

@@ -40,7 +40,8 @@ upgrade_gravityDB(){
 		version=3
 	fi
 	if [[ "$version" == "3" ]]; then
-		# This migration script upgrades ...
+		# This migration script upgrades the gravity and adlist views
+		# implementing necessary changes for per-client blocking
 		sqlite3 "${database}" < "/etc/.pihole/advanced/Scripts/database_migration/gravity/3_to_4.sql"
 		version=3
 	fi

advanced/Scripts/database_migration/gravity/3_to_4.sql

@@ -0,0 +1,25 @@
+.timeout 30000
+
+PRAGMA FOREIGN_KEYS=OFF;
+
+BEGIN TRANSACTION;
+
+DROP TABLE gravity;
+CREATE TABLE gravity
+(
+	domain TEXT NOT NULL,
+	adlist_id INTEGER NOT NULL REFERENCES adlist (id),
+	PRIMARY KEY(domain, adlist_id)
+);
+
+DROP VIEW vw_gravity;
+CREATE VIEW vw_gravity AS SELECT domain, gravity.adlist_id
+    FROM gravity
+    LEFT JOIN adlist_by_group ON adlist_by_group.adlist_id = gravity.adlist_id
+    LEFT JOIN adlist ON adlist.id = gravity.adlist_id
+    LEFT JOIN "group" ON "group".id = adlist_by_group.group_id
+    WHERE adlist.enabled = 1 AND (adlist_by_group.group_id IS NULL OR "group".enabled = 1);
+
+UPDATE info SET value = 4 WHERE property = 'version';
+
+COMMIT;