title: Is there an easy way to make sessions timeout in flask?
body: <p>I'm building a website with flask where users have accounts and are able to login.
  I'm using flask-principal for the loging in part and the role management.
  Is there a way of making the user's session expire after say 5 minutes or 10 minutes?
  I was not able to find that in flask documentation or, flask-principal's documentation.</p>
  
  <p>I thought of a way of doing it by hand, set a variable server-side with a time tag at the moment of login and at the next action the user takes, the server verifies the time-delta on that timestamp and deletes the session. </p>