Critical scheduling module migrated to React 19 without service freeze

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A development team successfully migrated a critical scheduling module from a legacy framework to React 19. The migration was conducted over three months without halting product delivery. The key strategy involved running both the old and new versions in parallel, allowing users to switch between them seamlessly. This approach required maintaining user state, like filters and screen positions, across both versions to ensure a smooth transition and build trust in the new system.

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