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The askbot_groupmembership table contains "membership level" and a link to a row in the auth_user_groups - which is the bridge table between the auth_user and auth_group. The auth_user_groups does not correspond to any model in the countrib.auth app, but is created for the ManyToMany User.groups field.

That issue may be addressed on handling the "m2m_changed" signal with the "pre_delete" argument, but it is hard to guarantee without trying by deleting the membership and simply editing the user record via the django admin.