The 3AM Column Rename
Team renamed customer_id → customer_uuid during a migration. At 3:17 AM, 4 Airflow pipelines failed, 2 dbt models errored.
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Team renamed customer_id → customer_uuid during a migration. At 3:17 AM, 4 Airflow pipelines failed, 2 dbt models errored.
fraud_score feature started returning NULLs after upstream type change. Model accuracy dropped 94% → 61%.
A NULL-injection bug in raw_events cascaded through 57 tables, 19 ML models, and 238 dashboards.
4 critical datasets had no owners assigned. Compliance audit approaching. Nobody knew who to contact.
Executive revenue dashboard stopped refreshing. CEO presenting Q3 numbers in 30 minutes.