https://stackabuse.com/using-sqlalchemy-with-flask-and-postgresql/ https://stackoverflow.com/questions/4567089/hash-function-that-produces-short-hashes/40119266 https://flask-migrate.readthedocs.io/en/latest/
before start you need run follow command from backend container
- flask db init
- flask db migrate -m "Initial migration."
- flask db upgrade see - https://flask-migrate.readthedocs.io/en/latest/