Validate Inputs Before Transforming

one malformed amount value kills a long transform and the team needs a repeatable ETL response. Use schema checks, type checks, domain checks, and reject records as the operating model. The common trap is making the visible number move before the pipeline contract is safe to rerun. That creates a temporary win and a later incident. Name the promise Write the expected input validation contract: schema checks, type checks, domain checks, and reject records. A named promise turns the issue from vague concern into a testable claim. Check evidence Collect counts, timestamps, keys, rejects, and target operation for the affected…

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