If I have a web app for messaging that started as non-end-to-end encrypted and I want to migrate that same service to be e2ee, how might I deal with old messages? If I'm using something like the Signal Protocol, would I have to go all the way back in time and re-double-ratchet every single message?

Alternatively, is it standard to just leave old messages as plaintext in the db? That certainly doesn't seem ideal.

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