tracing-upstream-lineage

Trace the origins of data - answer "Where does this data come from?" Determine what we're tracing: Tables are typically populated by Airflow DAGs. Find the connection: Search DAGs by name : Use af dags list and look for DAG names matching the table name Explore DAG source code : Use af dags source to read the DAG definition Check DAG tasks : Use af tasks list to see what operations the DAG performs If you're running on Astro, the Lineage tab in the Astro UI provides visual lineage exploration across DAGs and datasets. Use it to quickly trace upstream dependencies without manually searching DAG source code. Use DAG source code and task logs to trace lineage (no built-in cross-DAG UI). From the DAG code, identify source tables and systems: SQL Sources (look for FROM clauses): External Sources (look for connection references): File Sources : Recursively trace each source: For each upstream source: When tracing a specific column: One-line answer: "This table is populated by DAG X from sources Y and Z" Describe how data flows and transforms: - Table : Trace what populates this table - Column : Trace where this specific column comes from - DAG : Trace what data sources this DAG reads from - Search DAGs by name : Use af dags list and look for DAG names matching the table name - load_customers -> customers table - etl_daily_orders -> orders table - Explore DAG source code : Use af...