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It is a known issue. We have patched the table linking group with user with a new field level
and Django admin does not like this, we'd need to add our own table instead.
There will also be a reverse issue - when you change group memberships via the django admin,
we'll need to make sure that our records are also in sync (each group membership must be associated with the level
parameter which can be 0 - "pending" and 1 - "full".