bug fix

requirements_generator/core_utils.py

@@ -35,13 +35,21 @@ def log_change(
     req_id:      Optional[int] = None,
 ) -> None:
     """统一变更历史记录入口，持久化到数据库。"""
+    # 将所有业务字段打包进 changes（Text 列）
+    changes_payload = {
+        "change_type": change_type,
+        "module": module,
+        "req_id": req_id,
+        "summary": summary,
+        "logged_at": datetime.utcnow().isoformat(),
+    }
+    changes_text = json.dumps(changes_payload, ensure_ascii=False, indent=2)
+
+    # ✅ 只传 ChangeHistory 模型真实存在的字段
     history = ChangeHistory(
         project_id  = project_id,
-        change_type = change_type,
-        module      = module,
-        req_id      = req_id,
-        changes     = summary,
-        created_at  = datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
+        changes     = changes_text,
+        status      = "created",
     )
     db.create_change_history(history)