Summary

Currently, it is only possible to have a single backend replica due to the login session being stored in the backend.

Steps to Reproduce

Scale up the backend

Current Behaviour

Scicat only works correctly with one backend.

Expected Behaviour

In order to enable high availability and load balancing one should be able to use more than one backend.

Details

Sessions should be stored either on the client side or on the backend using a session store. Since there is already a mongodb, this can be used to store the user sessions