@dahukanna the implementation detail starts to leak out really badly here. The underlying content isn't rewriteable, it's a stream. So the only way to migrate old content would be to send *all* of that data to every server, modified, and backdated, without having it show up in any feed because it's not "new" content.
Which is fine, actually. Some implementations might have issues with it, but I don't see any actual barriers, and I suspect mastodon would behave pretty normal with that, even