Ah yes... having existing data in the target database will definitely make this a bit harder.
In that case you can do something like:
1. Copy the existing tables to another table or database.
2. Empty the tables that you copied over in the previous step, and make sure to check the seed (primary key) and set it to the last known ID you have.
3. Do the migration from phpbb.
4. Move back the users from step 1, ignoring any duplicates.
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