diff --git a/src/App.tsx b/src/App.tsx
index 7d28fc5..4303dc0 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -137,6 +137,7 @@ export default function App() {
           console.log('Fetching history data from Supabase for merge...');
           const historyData = await getHistoryDataForMerge();
           console.log('Supabase synced rows:', Object.keys(syncedData).length, '| History rows:', Object.keys(historyData).length);
+          console.log('[DEBUG] historyData["59272EN"] exists:', '59272EN' in historyData, '| value:', historyData['59272EN']?.[103], '| type:', typeof historyData['59272EN']);
           
           // Extend headers with virtual columns if the Excel is shorter than the saved data.
           // COLUMNS hardcoded indices (PRODUCT_TYPE=103, ITEM_TO_LOGISTIC=104, etc.) are used