BrainTrust Investment Lab › Band 4 — Managing the ETL Environment
Band 4 — Managing the ETL Environment · book p.493 · grain: one station per walk sheet
When someone asks to prove where a number came from and who touched it, this station is the answer: immutable archives, sequenced changes, lineage on demand. Compliance is a property of the design, not a scramble.
No walk sheets yet — this station begins when the ladder reaches it. Nothing is walked ahead of the lowest incomplete rung.
The contract — what each step must produce
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