Data CleaningVery Hard
Safely reprocess historical data after finding a bug.
Seen at: Meta · Stripe · Airbnb
You discover that a pipeline has been miscounting since January 1. Three months of downstream reports use the wrong data. Walk through the recovery.
Draft your answer
Saved to this browser only. Try it before you peek at the model answer.
Reveals the model answer and the self-score rubric.