Definition
A site migration is any large-scale change to a website that can affect how search engines crawl, index and rank it: moving to a new domain, changing URL structure, switching platforms or CMS, consolidating multiple sites, moving to HTTPS, changing the site architecture, or a major redesign. Migrations are high-risk for organic traffic because they touch URLs, internal links, content and technical signals at once, and mistakes - broken redirects, lost pages, changed content, blocked crawling - can cause sharp, sometimes lasting ranking losses.
A controlled migration is planned and staged: a full inventory of existing URLs and their traffic and links, a mapped 1:1 redirect from every old URL to its best new equivalent, preservation of content and metadata, updated internal links and sitemaps, testing on staging, a launch checklist, and close monitoring afterwards with a rollback option.
In context
For an iGaming affiliate, migrations are common - rebrands, consolidating several niche sites into one, restructuring URLs as the site grows, platform changes - and the niche's competitiveness makes a botched one expensive to recover from. The highest-risk elements are the ones that carry accumulated equity: operator reviews and comparison pages with rankings and links, and a large glossary whose value is in hundreds of indexed URLs and their interlinking.
Every one of those URLs needs a mapped redirect to its exact new counterpart, and the internal link graph (the glossary cross-links, the pillar-cluster structure) has to be rebuilt on the new URLs, not left pointing at redirects.
The migration checklist for this kind of site: inventory all URLs with traffic, rankings and backlinks; map 1:1 redirects (301) with no chains or loops; keep content, titles, metadata, structured data and hreflang pairings intact; update all internal links and both-language sitemaps to the new URLs; verify staging is noindexed and the live site is crawlable; launch at a low-traffic time; submit updated sitemaps; then watch Search Console coverage, the log files, rankings and traffic daily for weeks, fixing redirect and indexing issues fast. For a bilingual glossary specifically, confirm every EN/RU hreflang pair still resolves correctly after the move, since a migration is a classic way to break hreflang at scale.
Worked example
An affiliate consolidating three niche sites into one maps every old URL - including 600 glossary terms across two languages - to a 1:1 redirect, rebuilds internal links and hreflang pairs on the new URLs, tests on a noindexed staging site, and launches overnight. It monitors Search Console and logs daily for a month; a batch of missed redirects is caught and fixed in week one, and traffic recovers within six weeks.
Related terms
Frequently asked questions
Browse more iGaming terms in our glossary.
← Back to glossary