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Cost per acquisition is spend divided by conversions. The spend comes from four advertising platform APIs and usually pulls in twenty minutes, occasionally ninety. The job that computes the metric is scheduled for thirty minutes later. On slow mornings it runs on stale spend and publishes an unusually efficient number.
Two clocks, or one thing that understands order.
Practice studio
Run the review to check your architecture against this scenario — a valid DAG, a trigger for the freshness SLA, a transform stage, a quality gate before publish, and a failure path — then defend it in a short interview.
This scenario runs a full workspace — editor, canvas and results side by side. It needs a laptop or desktop to be usable. Open this page on a bigger screen to start building.