Celery tasks are not working properly

No matter which task is executed via Celery, it will always run the import command use in the task which was registered as last one.

added part::backend prio::1 type::bug labels

assigned to @hansegucker

created merge request !108 (merged) to address this issue

mentioned in merge request !108 (merged)

closed with merge request !108 (merged)

mentioned in commit 557346c7