version: "3.9"

# Optional: Postgres for the brief's tech-stack alignment.
# The app works with SQLite by default (DATABASE_URL=sqlite:///./gradeops.db).
# To use Postgres:
#   docker compose up -d db
#   set DATABASE_URL=postgresql+psycopg2://gradeops:gradeops@localhost:5432/gradeops in .env
#   python scripts/init_db.py

services:
  db:
    image: postgres:16-alpine
    environment:
      POSTGRES_USER: gradeops
      POSTGRES_PASSWORD: gradeops
      POSTGRES_DB: gradeops
    ports:
      - "5432:5432"
    volumes:
      - gradeops_pgdata:/var/lib/postgresql/data

volumes:
  gradeops_pgdata: