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UI Idea for one-click Lemmy account migration
(lemmy.world)
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this post was submitted on 25 Jul 2023
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It really needs to be everything - posts, comments, subscriptions, upvotes/downvotes, blocks, and mod status. It needs to be such that signing in to your account on the new instance is the same as signing into on the old one. It should be so seamless that you can just switch instances just to try out a new one and switch back again if it isn't for you.
It won’t be anything even close.
Indexes are unique to each instance. Post ID, Comment ID, Vote ID. There’s no way to correlate this information between two instances other than to do a full text match, post by post, comment by comment, vote by vote, to determine if what is being imported already exists on the new instance or is “new”.
Even if you go that route, then there’s the quandaries that follow… if you import what is effectively a “new” post to your new instance, do the comments (which aren’t yours) come along, or do you simply end up importing your post with no interaction history.
Then there is identity. You most likely have a non-local identity on your new server, as a result of federation, how does the new instance know that you are who you say you are, givimg you ownership of any of that existing content as it binds it to your, now, local identity?
That’s just off the top of my head.
If you’re lucky you’ll get to keep your cake day.
As long as they're using UUIDs where they should be the possibility of a collision is literally so low as to be impossible, but that relies on all the pieces of software using good principles.
Message activity contains a UUID but the activity table is considered disposable and is purged regularly. Once the message is broken down into its parts and stored the universal identifier is lost. All correlation is local.