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Knowledge Challenge
A friend thinks you can answer this question about Privacy by Design
A SaaS company receives a GDPR Article 17 erasure request from a former customer. Their data engineering team takes 6 weeks to respond and finds copies of the customer's data across the warehouse, 14 BI extracts, 3 ML training sets, and a reverse-ETL sync to Salesforce — and they cannot prove all copies were deleted. What is the root architectural failure?