fix:clean up sheets

src/detect_section_selector_masters/sendDiffToGoogleSheets.ts

@@ -45,7 +45,30 @@ async function uploadAllToSheets() {
 
   // Fetch existing sheet names
   const { data: spreadsheet } = await sheets.spreadsheets.get({ spreadsheetId });
-  const existing = spreadsheet.sheets?.map((s: any) => s.properties?.title || '') || [];
+  // Prepare and clean up sheets: delete all but the first to avoid empty spreadsheet
+  const sheetsArr = spreadsheet.sheets || [];
+  // Delete extra sheets (keep index 0)
+  if (sheetsArr.length > 1) {
+    const deleteRequests = sheetsArr.slice(1).map(s => ({ deleteSheet: { sheetId: s.properties?.sheetId } }));
+    await sheets.spreadsheets.batchUpdate({ spreadsheetId, requestBody: { requests: deleteRequests } });
+  }
+  // Track existing titles (only first sheet remains)
+  const existing: string[] = [sheetsArr[0]?.properties?.title || ''];
+
+  // Rename the remaining sheet to match the first file (if any)
+  if (files.length > 0) {
+    const firstName = files[0].file.replace(/\.json$/, '');
+    const firstSheetId = sheetsArr[0].properties?.sheetId!;
+    if (existing[0] !== firstName) {
+      await sheets.spreadsheets.batchUpdate({
+        spreadsheetId,
+        requestBody: { requests: [
+          { updateSheetProperties: { properties: { sheetId: firstSheetId, title: firstName }, fields: 'title' } }
+        ] }
+      });
+    }
+    existing[0] = firstName;
+  }
 
   for (const { subdir, file, path } of files) {
     // Use file name (without extension) as sheetName