Handle an Upstream Column Rename with Layered Containment

The situation A vendor-driven rename is rippling through your project late on a Friday. The risk is not the rename itself; the risk is letting every downstream model absorb vendor semantics independently. If you patch high in the stack first, you teach the org to chase symptoms instead of protecting contracts. Use the framework, not the reflex Contain change at the lowest stable contract The transformation layer works best when source turbulence is normalized once, then referenced everywhere else. Common shortcut Fast locally, expensive downstream. You trade a little short-term effort for less hidden rework. Protect the contract at the…

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