auto-claude: 024-fix-search-coalesce-wrapper-preventing-gin-trigram #86
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…y index usage Created verify_search_index.py to verify GIN trigram index usage on search queries. The script: - Checks if ix_messages_text_search GIN index exists and is properly configured - Verifies pg_trgm extension is enabled - Runs EXPLAIN ANALYZE on search queries with ILIKE patterns - Confirms index usage via Bitmap Index Scan (typical for GIN indexes) - Verifies both original_text and translated_text can use the GIN index - Validates that removing COALESCE allows index usage on translated_text Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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The search endpoint in
app/api/messages.py(line 304-308) usesfunc.coalesce(Message.translated_text, literal('')).ilike(search_term)to handle NULL translated_text values. The COALESCE function wrapper prevents PostgreSQL from using the GIN trigram index (ix_messages_text_search) on thetranslated_textcolumn, forcing a sequential scan on that predicate branch. Theoriginal_textILIKE can use the index, but the translated_text branch cannot.