Introducing Postgresql for persistance

docker-compose.yml

@@ -1,16 +1,44 @@
 services:
+  db:
+    image: postgres:16-alpine
+    container_name: schoolcompare_db
+    environment:
+      POSTGRES_USER: schoolcompare
+      POSTGRES_PASSWORD: schoolcompare
+      POSTGRES_DB: schoolcompare
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U schoolcompare"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 10s
+
   app:
     build: .
+    container_name: schoolcompare_app
     ports:
       - "80:80"
+    environment:
+      DATABASE_URL: postgresql://schoolcompare:schoolcompare@db:5432/schoolcompare
     volumes:
-      # Mount data directory for easy updates without rebuilding
+      # Mount data directory for migrations
       - ./data:/app/data:ro
+    depends_on:
+      db:
+        condition: service_healthy
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:80/api/data-info"]
       interval: 30s
       timeout: 10s
       retries: 3
-      start_period: 10s
+      start_period: 30s
+
+volumes:
+  postgres_data: