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## I have read the [CONTRIBUTING.md](<https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md>) file. YES ## What kind of change does this PR introduce? Bug fix for Studio notebook previews. ## What is the current behavior? Notebook diffs display the raw database_identifier value. This exposes opaque database IDs and does not communicate whether the cell targets the primary database or a read replica. Related issue: [https://linear.app/supabase/issue/FE-4246](<https://linear.app/supabase/issue/FE-4246>) ## What is the new behavior? Notebook database metadata is resolved independently from existing selector formatting: * an omitted database identifier is Primary * an identifier matching the project ref is Primary * other identifiers show a loading state while databases load * a loaded non-primary match is Replica * an unmatched identifier is Unknown * database lookup failures use a neutral unavailable state Labels are compact: Database: Primary, Database: Replica, and Database: Unknown. The databases query is enabled only when a preview contains an explicit non-primary identifier. ## Additional context Validation: * 39 focused notebook preview tests * Studio typecheck * targeted ESLint * Prettier check * git diff --check <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Notebook previews now identify database targets as primary, read replica, or unknown. * Database metadata is resolved automatically when needed. * Loading states display a clear “Loading database…” indicator. * Database metadata now handles unavailable, hidden, and error states more clearly. * Notebook entries reflect updated database information before and after replacement. <!-- end of auto-generated comment: release notes by coderabbit.ai -->