Flask SQLAlchemy(support for SQLAlchemy)
http://flask-sqlalchemy.pocoo.org/2.1/
Flask Httpauth(simple extension that simplifies the use of HTTP authentication with Flask routes.)
https://flask-httpauth.readthedocs.io/en/latest/
Flask script(provides support for writing external scripts)
https://flask-script.readthedocs.io/en/latest/
http://roseou.github.io/2016/05/15/script/
Flask Migrate(extension that handles SQLAlchemy database migrations)