perf(admin): optimize large-dataset loading for dashboard/users/accounts/ops

backend/migrations/065_add_search_trgm_indexes.sql

@@ -0,0 +1,33 @@
+-- Improve admin fuzzy-search performance on large datasets.
+-- Best effort:
+-- 1) try enabling pg_trgm
+-- 2) only create trigram indexes when extension is available
+DO $$
+BEGIN
+    BEGIN
+        CREATE EXTENSION IF NOT EXISTS pg_trgm;
+    EXCEPTION
+        WHEN OTHERS THEN
+            RAISE NOTICE 'pg_trgm extension not created: %', SQLERRM;
+    END;
+
+    IF EXISTS (SELECT 1 FROM pg_extension WHERE extname = 'pg_trgm') THEN
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_users_email_trgm
+                 ON users USING gin (email gin_trgm_ops)';
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_users_username_trgm
+                 ON users USING gin (username gin_trgm_ops)';
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_users_notes_trgm
+                 ON users USING gin (notes gin_trgm_ops)';
+
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_accounts_name_trgm
+                 ON accounts USING gin (name gin_trgm_ops)';
+
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_api_keys_key_trgm
+                 ON api_keys USING gin ("key" gin_trgm_ops)';
+        EXECUTE 'CREATE INDEX IF NOT EXISTS idx_api_keys_name_trgm
+                 ON api_keys USING gin (name gin_trgm_ops)';
+    ELSE
+        RAISE NOTICE 'skip trigram indexes because pg_trgm is unavailable';
+    END IF;
+END
+$$;