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Every time a source system renames a column, adds a new entity, or gets replaced entirely, a traditional star schema cracks. Dimension tables need surgery. ETL pipelines break. Someone spends a weekend fixing foreign key violations. At companies like Bloomberg or Stripe, where source systems change constantly and regulators can ask "what did this record look like on February 3rd at 2:47pm?", that fragility is genuinely unacceptable.
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