Row-Level Security
One person duplicates a workbook, forgets the filter, and the report renders perfectly for everyone. That is the failure mode to design against.
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Metric Definitions and the Semantic Layer
Revenue disagreements can arise from definitions, SQL, or different input versions. Trace the population, time basis, calculation, and published result.
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Semantic Layer
The same filter copied into seventeen dashboards is seventeen definitions. A semantic layer exists so there is one.