edde746
908b4a8dac
Every identity/pending mutation nested a per-instance SerialFutureQueue inside the static tvOS-recovery queue, so the per-instance layer added no serialization domain (reentrancy is already prevented by the durability Zone check). The unguarded updateSyncAttempt/deleteWatchAction pair had zero production callers — the sync service deliberately uses the revision-guarded variants. Tests migrated to the IfUnchanged pair by passing the row's current revision.