Queued tracker writes still replayed through the wrong account when the session died by token expiry instead of explicit disconnect: the auth-failure teardown cleared the store and rebound null but never purged the service's retry queue, so rows queued under account A replayed through whichever account connected next. The invalidation callback now purges like the disconnect path, after the rebind so an in-flight failure is dropped by the account-binding check instead of re-queueing behind the purge.
Narrower second hole in the same invariant: removeService swept the in-memory fallback outside the queue lock, so an enqueue whose persist failed while a disconnect raced it re-buffered the row after the sweep and the next flush resurrected it. The fallback add and the fallback sweep both run inside the queue lock now, so lock-slot order covers the buffered store the same way it already covered the persisted one.
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