when upgrading a multi-server environment from 4.4 -> 5.0 with users created in 4.4 the import joinscript failed with the following error: Upgrading schema from UCS@school 4.4 to UCS@school 5.0 DELETE 0 Operations to perform: Apply all migrations: django_celery_results Running migrations: No migrations to apply. FEHLER: Constraint »import_api_userimportj_result_id_7383b884_fk_celery_taskmeta_id« von Relation »import_api_userimportjob« existiert nicht 40ucs-school-import-http-api.inst: Failed to drop djcelery constraint
*** This bug has been marked as a duplicate of bug 53792 ***