Shopify migrations that do not lose traffic

Sitemaps lie. They list what the CMS thinks exists, not what search engines have indexed and users still hit.

Pull 18 months of server logs, dedupe by URL, and keep every path with a single organic session. On a typical $5M store that is 30 to 60% more URLs than the sitemap shows.

Map each one manually where it matters and by rule where it does not. Then test the redirect map on staging with a crawler before launch, not after.