FUP to https://github.com/supabase/supabase/pull/47709
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## Summary by CodeRabbit
* **Documentation**
* Updated the Next.js Sentry setup guide with clearer wording and a
step-by-step configuration flow.
* Added explicit instructions for instrumenting Supabase clients in
server, browser, and middleware contexts.
* Included guidance for enabling query and mutation data capture so
Supabase activity appears in monitoring as database spans.
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