We want to stop removing unused deprecated relationship types because they are still useful for historical data display (such as in edits). At the same time, it's annoying to have them take space on relationship type selectors, since they are useless there. bitmap suggested: "I'd probably filter them out from get_all, or whatever we use, but you can still fetch them with get_by_id" - so not showing them when we're trying to get all relationship types, but still give the info if we ask for this relationship type specifically.