What types of data can be stored in a Flask session? How do sessions handle large amounts of data?

Is there a way to prevent a session from data loss if there's a timeout?

Could you explain how the flash() function uses sessions to carry the flashed messages around from page to page?

Can we go over reasons not to use sessions again?

Could you explain how sessions handle secrets after users log out?

When you say session, does that include the user's interactions on the web app before logging in?

How  is it possible that we able to store session data on a cookie when there is more session data than cookie size (the 10k vs 7k example in the reading)?

what is the longest possible time span of cookies?