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That sounds like a good guideline. It'd be good to have a mechanism for people who have fav'd the old one to migrate to the new one, so people don't lose favorites. Without an interface to do this automatically at deletion-time, I'm not sure how to do that. (I think Danbooru has a "no deleting dupes ever" policy, so this might not be something rq will add, though it wouldn't hurt to ask.)

Should we narrow down to just one of (flag dupes, dupe pool, "duplicate" tag) ?