Trace ETL Lineage Before Changing Code

The key idea: make lineage boundaries inspectable. Name the contract For this topic, the contract is source count, raw landing count, transformed count, and loaded count. Naming it keeps the team from treating every data issue as a vague pipeline failure. Check the boundary Ask where the promise first stopped being true: extract, transform, or load. Boundary checks are faster than editing the first SQL file you see. Preserve evidence Counts, timestamps, reject reasons, keys, and run IDs make the lesson operational. Evidence lets another person verify the same conclusion.

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