don't version db migration stuff

	deleted:    db_repository/README
	deleted:    db_repository/__init__.py
	deleted:    db_repository/manage.py
	deleted:    db_repository/migrate.cfg
	deleted:    db_repository/versions/001_migration.py
	deleted:    db_repository/versions/002_migration.py
	deleted:    db_repository/versions/003_migration.py
	deleted:    db_repository/versions/004_migration.py
	deleted:    db_repository/versions/005_migration.py
	deleted:    db_repository/versions/__init__.py