Coalesce commits through a single worker task#385
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Replace the sequence-watermark WriteCoordinator with an mpsc-based worker that drains queued transactions, merges them into one WriteBatch, and issues a single db.write_with_options per batch. The worker emits system_counter_key only when next_id has advanced since the last batch, so metadata and data ops no longer carry a counter write.
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Replace the sequence-watermark WriteCoordinator with an mpsc-based worker that drains queued transactions, merges them into one WriteBatch, and issues a single db.write_with_options per batch. The worker emits system_counter_key only when next_id has advanced since the last batch, so metadata and data ops no longer carry a counter write.