How to I delete all Flask sessions?

Question

How do I delete all sessions and cookies set by my Flask/python app. So that when users return they have to re-login. I want to do this each time I push a new version of the code to production otherwise.

Answer 1

Best way I found is to invalidate the secret key like so

app.secret_key = os.urandom(32)

The key is secure enough, and each time you launch your system the key changes invalidating all sessions.