Commit to a Cleaning Log

Create a repeatable cleaning log for one live dataset. Use a live dataset where a cleaning defect affects a metric, join, forecast, or operational review. A source file has duplicate customer IDs after trimming spaces and normalizing case A dashboard metric changes after you parse date fields from two source systems A forecast input has missing region values that could be derived from country only for some rows When I see [specific data-cleaning defect], I will preserve the raw value, write the cleaning rule in one sentence, apply it to a derived field or reviewed row set, and record before/after…

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