Why couldn't it show up during the edit window? I don't think it goes against anything - yea, people may already tipped you some sats, but they presumably got the value from the post already, so that's a fair game.
They could also reply to it which would end up being a dangling pointer. We can do like reddit and create a tombstone though I guess.
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I think tombstone thing works, or you could also check whether the post already has comments - if not, then feel free to delete it.
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