debugging-data-pipelines

Systematically root-cause data pipeline failures and data incidents — job errors, wrong or missing data, duplicates, and freshness misses — by tracing lineage upstream, isolating the failing stage, reconciling against source, and planning a safe fix and backfill. Use when a pipeline fails, numbers look wrong, data is missing or duplicated, a dashboard is stale, or a stakeholder reports a data discrepancy.