Check flask-login to authenticate users

I wonder whether we checked the flask-login for user auth instead of using our more or less custom code, @sarthikg?

https://www.digitalocean.com/community/tutorials/how-to-add-authentication-to-your-app-with-flask-login https://www.askpython.com/python-modules/flask/flask-user-authentication

(pointed out by @juga)