Use Hibernate as a database (#32)

* Basic hibernate structure.

* Commit stash.

* Improve a lot of things.

* Implement Feed, PubSub, query optimizations.

* Update video views on channel visits.

* Allow mass importing subscriptions.

* Allow configuring database in config.properties.

* Major multi-threading and pubsub improvements.

* PubSub query improvements and fix for postgres.

* Revert docker-compose change.

* Disable showing sql statements.

docker-compose.yml

@@ -1,9 +1,19 @@
-version: "3.8"
 services:
-  piped:
-    image: 1337kavin/piped:latest
-    restart: unless-stopped
-    ports:
-      - "127.0.0.1:8080:8080"
-    volumes:
-      - ./config.properties:/app/config.properties
+    piped:
+        image: 1337kavin/piped:latest
+        restart: unless-stopped
+        ports:
+            - "127.0.0.1:8080:8080"
+        volumes:
+            - ./config.properties:/app/config.properties
+        depends_on:
+            - postgres
+    postgres:
+        image: postgres:13-alpine
+        restart: unless-stopped
+        volumes:
+            - ./data/db:/var/lib/postgresql/data
+        environment:
+            - POSTGRES_DB=piped
+            - POSTGRES_USER=piped
+            - POSTGRES_PASSWORD=changeme