Migration Strategies — Zero-Downtime Patterns
Blue-green data migrations, dual-write patterns, and rollback strategies for moving data safely.
The most terrifying words in software engineering aren't "we need to rewrite." They're "we need to migrate the data." A rewrite means building something new alongside the old thing. A data migration means moving the actual source of truth — the one thing you can't afford to get wrong — from one place to another while the business keeps running.
You can't just turn off the application for a weekend. Customers are placing orders. Users are uploading content. Partners are pulling data. Every minute of downtime costs money and trust.
Zero-downtime migration is the art of moving data between systems while the application continues to serve traffic without interruption. It's hard. It's stressful. And it's absolutely doable if you follow the right patterns.
The Naive Approach (Don't Do
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