Add initial database schema and references

Also look into users a bit

.dev/.env

@@ -0,0 +1,4 @@
+POSTGRES_DB=elo_app
+POSTGRES_USER=elo
+POSTGRES_PASSWORD=elo
+DATABASE_URL=postgres://elo:elo@db:5432/elo_app

.dev/docker-compose.yml

@@ -0,0 +1,18 @@
+services:
+  db:
+    image: postgres:15.3-alpine
+    restart: unless-stopped
+    ports:
+      - 5432:5432
+    networks:
+      - db
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    env_file:
+      - .env
+
+volumes:
+  postgres-data:
+
+networks:
+  db: