feat: add PostgreSQL service to docker-compose and configure Django settings to use PostgreSQL from .env

backend/config/settings.py

@@ -86,12 +86,26 @@ WSGI_APPLICATION = 'config.wsgi.application'
 # Database
 # https://docs.djangoproject.com/en/6.0/ref/settings/#databases
 
-DATABASES = {
-    'default': {
-        'ENGINE': 'django.db.backends.sqlite3',
-        'NAME': BASE_DIR / 'db.sqlite3',
+POSTGRES_DB = os.getenv('POSTGRES_DB')
+if POSTGRES_DB:
+    DATABASES = {
+        'default': {
+            'ENGINE': 'django.db.backends.postgresql',
+            'NAME': POSTGRES_DB,
+            'USER': os.getenv('POSTGRES_USER', 'postgres'),
+            'PASSWORD': os.getenv('POSTGRES_PASSWORD', 'postgres'),
+            'HOST': os.getenv('POSTGRES_HOST', 'localhost'),
+            'PORT': os.getenv('POSTGRES_PORT', '5432'),
+        }
     }
-}
+else:
+    DATABASES = {
+        'default': {
+            'ENGINE': 'django.db.backends.sqlite3',
+            'NAME': BASE_DIR / 'db.sqlite3',
+        }
+    }
+
 
 
 # Password validation

docker-compose.yml

@@ -1,4 +1,22 @@
 services:
+  db:
+    image: postgres:16-alpine
+    container_name: divar_postgres
+    restart: always
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB:-divar_crawler}
+      POSTGRES_USER: ${POSTGRES_USER:-postgres}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-postgres} -d ${POSTGRES_DB:-divar_crawler}"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
   redis:
     image: redis:7-alpine
     container_name: divar_redis
@@ -20,11 +38,14 @@ services:
       - "8000:8000"
     environment:
       - REDIS_URL=redis://redis:6379/0
+      - POSTGRES_HOST=db
     env_file:
       - .env
     volumes:
       - ./backend:/app/backend
     depends_on:
+      db:
+        condition: service_healthy
       redis:
         condition: service_healthy
 
@@ -36,15 +57,16 @@ services:
     command: sh -c "celery -A config worker --loglevel=info -P gevent -c 20"
     environment:
       - REDIS_URL=redis://redis:6379/0
+      - POSTGRES_HOST=db
     env_file:
       - .env
     volumes:
       - ./backend:/app/backend
     depends_on:
+      db:
+        condition: service_healthy
       redis:
         condition: service_healthy
-      backend:
-        condition: service_started
 
   frontend:
     build:
@@ -60,3 +82,6 @@ services:
       - /app/frontend/node_modules
     depends_on:
       - backend
+
+volumes:
+  postgres_data: