diff --git a/scripts/create_tables.py b/scripts/create_tables.py
index d2f4ebd..b2fd415 100644
--- a/scripts/create_tables.py
+++ b/scripts/create_tables.py
@@ -304,6 +304,30 @@ async def main():
         except Exception as e:
             print(f'  WARN: pipeline_git_locks ensure failed: {e}')
 
+        # sd_iterations 迭代序号 seq_no 列 + 存量回填 + 脏状态修复（active→in_progress）
+        # 「当前迭代」改为显式 status='in_progress' 标记，迭代按 seq_no 顺序编号推进，
+        # 不再靠 created_at 推断当前迭代。
+        try:
+            r = await sor.sqlExe(
+                "SELECT COUNT(*) as c FROM information_schema.COLUMNS "
+                "WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='sd_iterations' "
+                "AND COLUMN_NAME='seq_no'", {})
+            await sor.sqlExe("COMMIT", {})
+            if not r or getattr(r[0], 'c', 0) == 0:
+                await sor.execute("ALTER TABLE sd_iterations ADD COLUMN seq_no INT NOT NULL DEFAULT 0", {})
+            # 存量回填：seq_no=0 的迭代按每项目 created_at ASC 顺序赋 1,2,3...
+            await sor.sqlExe(
+                "UPDATE sd_iterations t JOIN ("
+                "SELECT id, ROW_NUMBER() OVER (PARTITION BY project_id ORDER BY created_at ASC, id ASC) AS rn "
+                "FROM sd_iterations WHERE seq_no = 0) x ON x.id = t.id "
+                "SET t.seq_no = x.rn", {})
+            # 脏状态修复：迭代状态合法值 planning/in_progress/completed/cancelled，无 active
+            await sor.sqlExe(
+                "UPDATE sd_iterations SET status='in_progress', updated_at=NOW() WHERE status='active'", {})
+            print('  migrate: sd_iterations seq_no column + backfill + active→in_progress ensured')
+        except Exception as e:
+            print(f'  WARN: sd_iterations migrate failed: {e}')
+
 
 if __name__ == '__main__':
     asyncio.run(main())