Why a migration canary matters Schema changes used to be a single-team problem: run a migration, deploy the code, hope for the best. With independent deploys, long-running backfills, and even AI-generated migrations, schema changes have turned into a distributed-systems problem. A failing migration today can slowly corrupt data across services rather than causing a single immediate deploy failure. A migration canary is a small, long-lived process that continuously verifies the overlap win...