Support migration to another server (through user_migration app)

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Feature request

When moving to another Nextcloud instance it would be great to keep my chat history. So ideally the chats are stored in the export created when using the migration app!

Question: This is easy for note-to-self or public chats, but what about user chats?

• I suggest to make the other users guest/anonymous users with their name set as the visible user name.
  • perhaps, on import, some day - mapping users would be nice. But for a private user that makes little sense. When migrating multiple users as admin (currently not really a feature!) this will be needed.

Start by locating the user_migration app's export and import flow for Nextcloud Talk data. Determine how note-to-self, public, and user chats are represented, then define and verify what preserving chat history and handling users should mean during migration.