Increment 1 - Step 3: Docker Compose Postgres - #3
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docker/docker-compose.yml — postgres:16-alpine (pulled 16.14), project name modulo, container modulo-postgres, named volume modulo_pgdata, and a pg_isready healthcheck so up --wait blocks until the DB actually accepts connections. Two deliberate security/ergonomics details: the host port binds to 127.0.0.1:5433 only and ./initdb mounts read-only into the image's entrypoint directory.
docker/initdb/01_create_test_db.sql — creates modulo_test for integration tests; runs once on first initialization of an empty volume.
scripts/db-up.sh — starts and waits for healthy, with a clear error if Docker isn't running.
scripts/db-down.sh — stops preserving data by default; --wipe deletes the volume behind an explicit y/N confirmation prompt.