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Makes puzzle, answers, and chatrooms models with soft deletion, so deletes are undoable. PuzzleTag is left as a normal model, because there are uniqueness constraints on them, but
PuzzleTag.objects
doesn't pick up soft deleted instances so would be sorta annoying to check every time we create a new tag that there isn't a soft deleted one already. Instead I handled deleting/restoring tags through signals.Also adds 30 minute wait before cleaning up chats (fixes #548)