services:
  db:
    image: postgres:16
    # ❌ нет volume — данные потеряются при docker compose down
    # ❌ нет healthcheck
    # ❌ нет environment

  app:
    build: .
    depends_on:
      - db          # ❌ просто ordering, не ждёт готовности БД
    environment:
      DB_HOST: db
    ports:
      - "8000:8000"

services:
  db:
    image: postgres:16-alpine
    environment:
      POSTGRES_USER: ${POSTGRES_USER:-app}
      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-app}
      POSTGRES_DB: ${POSTGRES_DB:-app}
    volumes:
      - pg_data:/var/lib/postgresql/data
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-app}"]
      interval: 5s
      timeout: 3s
      retries: 10

  app:
    build: .
    env_file: .env
    depends_on:
      db:
        condition: service_healthy
    ports:
      - "8000:8000"
    restart: unless-stopped

volumes:
  pg_data: