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* Ignore Flake8 unused import error F401 https://flake8.readthedocs.io/en/latest/user/error-codes.html The apparently unused imports may be needed for SQLAlchemy. As the code comment says: make sure all SQL Alchemy models are imported before initializing DB otherwise, SQL Alchemy might fail to initialize properly relationships See GitHub 28 and 29 * Ignore Flake8 unused variable error F841 https://flake8.readthedocs.io/en/latest/user/error-codes.html The apparently unused variables may be needed for tests. * Bring line length into compliance with Black Should be 88 characters. * Format alembic code with Black