diff --git a/aabook/src/alter_table.py b/aabook/src/alter_table.py
index 78fba71..1fdb849 100644
--- a/aabook/src/alter_table.py
+++ b/aabook/src/alter_table.py
@@ -48,12 +48,12 @@ def check_dirty_chapters():
     for i in range(100):
         table_name = f'{tbl_name_chapters_prefix}_{i}'
         try:
-            cursor.execute(f"SELECT count(*) FROM {table_name} WHERE created_at >= '2025-03-23 10:20:00' and created_at <= '2025-03-23 11:20:00' ")
+            cursor.execute(f"SELECT count(*) FROM {table_name} WHERE updated_at >= '2025-03-23 10:20:00' and updated_at <= '2025-03-23 11:20:00' ")
             row = cursor.fetchone()
             if row:
                 dirty_chapters_all += row[0]
 
-            cursor.execute(f"SELECT count(*) FROM {table_name} WHERE created_at >= '2025-03-23 10:20:00' and created_at <= '2025-03-23 11:20:00' and content like '%aabook%' ")
+            cursor.execute(f"SELECT count(*) FROM {table_name} WHERE updated_at >= '2025-03-23 10:20:00' and updated_at <= '2025-03-23 11:20:00' and content like '%aabook%' ")
             row = cursor.fetchone()
             if row:
                 dirty_chapters += row[0]
@@ -70,7 +70,7 @@ def update_dirty_chapters():
     for i in range(100):
         table_name = f'{tbl_name_chapters_prefix}_{i}'
         try:
-            cursor.execute(f"update {table_name} set has_content = 0 WHERE created_at >= '2025-03-23 10:20:00' and created_at <= '2025-03-23 11:20:00' ")
+            cursor.execute(f"update {table_name} set has_content = 0 WHERE updated_at >= '2025-03-23 10:20:00' and updated_at <= '2025-03-23 11:20:00' ")
             updated_rows = cursor.rowcount
             print(f"update {table_name}, affected rows: {updated_rows}")