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tracing-upstream-lineage

Trace upstream data lineage. Use when the user asks where data comes from, what feeds a table, upstream dependencies, data sources, or needs to understand data origins.

skills/tracing-upstream-lineage/SKILL.md

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# Upstream Lineage: Sources

Trace the origins of data - answer "Where does this data come from?"

## Lineage Investigation

### Step 1: Identify the Target Type

Determine what we're tracing:
- **Table**: Trace what populates this table
- **Column**: Trace where this specific column comes from
- **DAG**: Trace what data sources this DAG reads from

### Step 2: Find the Producing DAG