User deletion is not complete

[ncasnap]

Bug Report

Problematic behavior
When I delete a user in keycloak, it does not delete it from django backend user.
When we delete and add the same user we cannot create room anymore.

Expected behavior/code
When I delete the user from keycloak, the user is also deleted in django backend.

Steps to Reproduce

1. Create a user in keycloak and login to magnify
2. Check the django user interface : the user is created
3. Delete the user in keycloak
4. The user is still present in django
5. if you try to add the same user when you login to magnify you will not be able to create room

I stay available if you need more information.
Regards,
Nathan