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Migrations are one of the highest-risk moments in SEO — most ranking losses after a redesign or replatform trace back to a handful of avoidable mistakes.

Before launch
- Crawl and document every existing URL and its current performance
- Map every old URL to its exact new equivalent
- Preserve existing content rather than treating the migration as a content reset
After launch
- Verify every mapped redirect actually works — see redirect strategy
- Resubmit the sitemap and monitor crawl stats closely for the first few weeks
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