7.7 Compose up, down, logs, ps

docker compose up -d --build
docker compose ps
docker compose logs -f api
docker compose logs -f db

# stop containers, keep volumes
docker compose down

# also removes named volumes — lab data is gone
# docker compose down -v

Steps — persist through restart

1. docker compose up -d --build
2. Insert one test row through the API or docker compose exec db psql -U postgres.
3. docker compose down (no -v).
4. docker compose up -d
5. Read the same row. The named volume worked.
6. docker compose down -v only when you want a clean wipe.