hard20 pts · first answer countsdata-qualitydata-contracts

Upstream renamed a column

A product team renamed user_id to account_id in their events, and 30 downstream models broke overnight. What is the best long-term prevention?

A.Agree on data contracts with schema checks in the producer's CI, so breaking changes are blocked or versioned before releaseB.Ask analysts to check the events table every morningC.Store all events as untyped stringsD.Stop using events from that team

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Upstream renamed a column

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