You don't need to delete data instantly, you just need to do it within a reasonable timeframe. So batching data deletion requests and running a clear out once a week should be fine.
You may even be okay to just reply to the user that you've deleted all active copies of the data and it'll be fully gone when your backups expire in 30 days.
You may even be okay to just reply to the user that you've deleted all active copies of the data and it'll be fully gone when your backups expire in 30 days.
IANAL tho.