Where they started
Quanta syncs shipment data for 900 customer accounts. One large customer imported 400,000 rows every night, and smaller customers’ morning syncs queued behind it.
What they built
Syncs moved to a workflow with a concurrency limit keyed on the account ID. The runtime serves accounts in turn, so the big import still finishes overnight while small syncs start within seconds.
Long imports now sleep between batches of 5,000 rows instead of holding a worker, which cut their compute bill as a side effect.
What changed
The 95th-percentile wait for a sync fell from 38 minutes to under two, and the fix was one line of configuration.
