diff --git a/src/App.tsx b/src/App.tsx
index 9a51534..7d28fc5 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -229,6 +229,9 @@ const articleNoIdx = resolvedCols.ARTICLE_NO;
             }
             
             if (articleNo === '59272EN') {
+              console.log('[DEBUG 59272EN] hist?.length:', hist?.length, '| hist?.[103]:', hist?.[103], '| hist type:', typeof hist);
+              console.log('[DEBUG 59272EN] synced?.data?.[103]:', synced?.data?.[103]);
+              console.log('[DEBUG 59272EN] sourceForInternal?.[103]:', sourceForInternal?.[103]);
               console.log('[DEBUG 59272EN] FINAL processedRow[103]:', finalRow[103], '| length:', finalRow.length);
             }
             
diff --git a/src/lib/supabase.ts b/src/lib/supabase.ts
index 114122c..eaa4ada 100644
--- a/src/lib/supabase.ts
+++ b/src/lib/supabase.ts
@@ -14,9 +14,12 @@ async function safeFetch(url: string, options: RequestInit = {}): Promise<Respon
   };
 
   let response = await fetch(url, { ...options, headers });
+  console.log('[safeFetch] URL:', url.split('?')[0]);
+  console.log('[safeFetch] Status:', response.status, '| OK:', response.ok);
+  console.log('[safeFetch] Session token:', !!session, '| Token length:', token?.length);
 
   if (response.status === 401 && session?.refresh_token) {
-    console.log('JWT expired, attempting refresh...');
+    console.log('[safeFetch] 401 - refreshing session...');
     try {
       const newSession = await refreshSession(session.refresh_token);
       const newHeaders = {
@@ -25,8 +28,9 @@ async function safeFetch(url: string, options: RequestInit = {}): Promise<Respon
         'Authorization': `Bearer ${newSession.access_token}`,
       };
       response = await fetch(url, { ...options, headers: newHeaders });
+      console.log('[safeFetch] After refresh - Status:', response.status);
     } catch (refreshError) {
-      console.error('Session refresh failed:', refreshError);
+      console.error('[safeFetch] Session refresh failed:', refreshError);
     }
   }
 
@@ -206,6 +210,14 @@ export async function getHistoryDataForMerge(): Promise<Record<string, ExcelRow>
       return {};
     }
     const entries: Array<{ product_id: string; new_data: ExcelRow }> = await response.json();
+    console.log('[getHistoryDataForMerge] Raw entries count:', entries.length);
+    const entry_59272 = entries.find(e => e.product_id === '59272EN');
+    console.log('[getHistoryDataForMerge] 59272EN entry found:', !!entry_59272);
+    if (entry_59272) {
+      console.log('[getHistoryDataForMerge] 59272EN new_data length:', entry_59272.new_data?.length);
+      console.log('[getHistoryDataForMerge] 59272EN new_data[103]:', entry_59272.new_data?.[103]);
+      console.log('[getHistoryDataForMerge] 59272EN new_data type:', typeof entry_59272.new_data);
+    }
     
     const result: Record<string, ExcelRow> = {};
     const seen = new Set<string>();