Safe Schema Migrations and Progressive Rollouts

A three-day, evidence-first course on compatibility migrations, blue/green cutovers, and recovery from the edge cases that make data releases dangerous.

1. 01Change a Live Schema Without Breaking Old CodeBuild a compatibility-first migration for Example Knowledge Service, then prove both the old and new application versions can serve the same data.Published 12 Aug 20269 sections
2. 02Isolate a Breaking Migration with Blue/Green DataUse the Day 01 compatibility contract to decide when an incompatible schema needs a point-in-time copy, a durable-ingestion freeze, and atomic per-organization routing.Published 12 Aug 20269 sections
3. 03Promote or Replay-Roll Back from EvidenceConsume the Day 02 cutover decision record to run a named promotion gate, diagnose failures bottom-up, and replay safely if green must be abandoned.Published 12 Aug 202610 sections