In the sprawling architecture of enterprise data warehousing, there is a persistent, seductive trap: the belief that the code is the documentation. Engineers often operate under the assumption that if a transformation is written in a script, the logic is self-evident. However, as data ecosystems grow from manageable streams into complex deltas, this logic fractures. The code becomes a black box, and the lineage of data—a financial figure in a report or a customer identifier in a campaign—becomes a matter of faith rather than fact.