Fix owned account notes not being deleted when an account is deleted #16579
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When an account is deleted while keeping its
account
record (which is the default when definitely suspending, or self-deleting a local account), account notes owned by this account are not deleted, unlike any other data owned by the deleted account.In addition to keeping private data for longer than it should (possibly indefinitely), this also may be the root cause for the issue addressed in #16576.
This PR fixes
DeleteAccountService
to delete those account notes, and adds a migration script to automatically delete every already-orphaned account notes.