fix duplicate message

app/sheets.py

@@ -92,7 +92,7 @@ class SheetsClient:
             for row in values:
                 # Bổ sung cột rỗng cho đủ 12 cột
                 row = row + [""] * (12 - len(row))
-                if row[4] == user_id and row[5] == page_id and row[8].lower() == 'false':
+                if row[4] == user_id and row[5] == page_id and row[11].lower() == 'false':
                     history.append({
                         'conversation_id': row[0],
                         'originalcommand': row[1],