title: Django - Session expiration renewal
body: <p>I'm struggling with a question about sessions.</p>
  <p>I wonder how to make a session expire if the user has not tried to connect to the website in a certain period of time (15 days for example).
  In other words, I would like to renew the expiration date of a user session each time he/she is connecting to the site.</p>
  <p>I scrapped a lot of websites but I couldn't find any valuable example.</p>