Check Link Table Deleted
The common reason why soft delete did not have effect is that several DEFs have been created with the same Date of Information.
SELECT "public".link.from_guid, "public".link.from_link_type, "public".link.to_link_type, "public".link.to_guid, "public".link.update_type, "public".link.deleted, "public".link.data_entry_date FROM "public".link WHERE "public".link.update_type = 'DELETE' AND "public".link.deleted = 'f' ORDER BY "public".link.from_link_type ASC