Diamonds are forever, so are URLs
summary
Links to moved content break user journeys and cause 404 rage; treat URLs as long-lived and implement 301 redirects from old paths to new ones. Group similar pages under predictable prefixes so bulk rewrites work. Build a usable better 404 page with search and site chrome, and put important UI state into the URL so shared filters and SPA screens restore correctly. Track 404 hits with analytics to find missing routes, add rel=canonical for duplicate URLs, and watch for dangling DNS during migrations.
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