fix: db session not commit before long llm call running (#1251)

api/core/model_providers/models/llm/base.py

 import json
 import os
 import re
+import time
 from abc import abstractmethod
 from typing import List, Optional, Any, Union, Tuple
 import decimal
 from core.third_party.langchain.llms.fake import FakeLLM
 import logging
 
+from extensions.ext_database import db
+
 logger = logging.getLogger(__name__)
 
 
         if self.deduct_quota:
             self.model_provider.check_quota_over_limit()
 
+        db.session.commit()
+
         if not callbacks:
             callbacks = self.callbacks
         else: