Fix historical sync race condition #241
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…migrating down (way more SQL queries)
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Flaky tests made it clear that the historical sync service was occasionally failing to fully merge log filter cached intervals before emitting the
syncCompleteevent. This was caused by a race condition. The previous design was relying on the block task worker to merge cached intervals after inserting the new one, which was unsafe because the multiple merge operations could occur at the same time. The fix introduced here adds some logic to the queue worker to merge all intervals on the last task in the queue.