Every few weeks a backend team would rename a column and our pipelines would break silently.

Every few weeks a backend team would rename a column and our pipelines would break silently. What we did: 1. Producers define a contract (schema + semantics + owner) in YAML in their repo 2. CI checks on the producer side block breaking changes unless the version is bumped 3. We consume via a versioned view, never the raw table 4. Breaking changes need a 2-week deprecation window Incidents from upstream changes: 11 last year, 1 this year. The cultural part (producers owning their data) was harder than the tooling.