Add on_delete, meeting_id and equal_fields
Add on_delete, meeting_id and equal_fields

ostcar/OpenSlides,normanjaeckel/OpenSlides,normanjaeckel/OpenSlides,tsiegleauq/OpenSlides,ostcar/OpenSlides,ostcar/OpenSlides,OpenSlides/OpenSlides,tsiegleauq/OpenSlides,tsiegleauq/OpenSlides,normanjaeckel/OpenSlides,OpenSlides/OpenSlides,normanjaeckel/OpenSlides