Session cookie is too large flask application
It looks like you are using the client-side type of session that is set by default with Flask which has a limited capacity of 4KB. You can use a server-side type session that will not have this limit, for example, by using a back-end file system (you save the session data in a file system in the server, not in the browser). To do so, set the configuration variable 'SESSION_TYPE' to 'filesystem'. 
You can check other alternatives for the 'SESSION_TYPE' variable in the Flask documentation.
I'm trying to load certain data using sessions (locally) and it has been working for some time but, now I get the following warning and my data that was loaded through sessions is no longer being loaded.

The "b'session'" cookie is too large: the value was 13083 bytes but
  the header required 44 extra bytes. The final size was 13127 bytes but
  the limitis 4093 bytes. Browsers may silently ignore cookies larger
  than this.

I have tried using session.clear(). I also opened up chrome developer tools and tried deleting the cookies associated with 127.0.0.1:5000. I have also tried using a different secret key to use with the session.
It would be greatly appreciated if I could get some help on this, since I have been searching for a solution for many hours.
Edit:
I am not looking to increase my limit by switching to server-side sessions. Instead, I would like to know how I could clear my client-side session data so I can reuse it.
Edit #2:
I figured it out. I forgot that I pushed way more data to my database, so every time a query was performed, the session would fill up immediately.