I have never tried it but theorectically, you should be able to do this. The first step would be to create your new test database. Just dump your current DB, and use that to load your new DB using a different name. The database name is specified in the json config file, so you can change which database the game loads whenever you spin up the server. You could then dump and copy tables as desired, though obviously you have to be careful not to get things out of sync. Personally, I would just migrate to the new database once it is ready rather than trying to do piecemeal copies.
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