The test-db postgres image only executes /docker-entrypoint-initdb.d on a
fresh data directory. Reusing the volume from a prior run silently skipped
new schema migrations (e.g. 04_detection_classes.sql, 05_resources.sql),
producing phantom "relation does not exist" failures on the second and
subsequent runs. Always start with a clean state.
Verified: two consecutive runs both green (48/48 e2e).
Co-authored-by: Cursor <cursoragent@cursor.com>