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Migration Diary: Run the Cutover in Shadow Mode Before You Cancel the Old Plan

Cancel the old plan only after a shadow window has replayed your real traffic through the new path and the diff report came back boring. A fixture suite proves that the new stack can answer questions you already knew how to ask; shadow traffic proves it survives the ones your users actually sent la…

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  1. 2026-11-08 19:54 · DEV Community — AI
    Migration Diary: Run the Cutover in Shadow Mode Before You Cancel the Old Plan

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