diff --git a/api/db/services/connector_service.py b/api/db/services/connector_service.py
index 23e9faffe..db8c713e2 100644
--- a/api/db/services/connector_service.py
+++ b/api/db/services/connector_service.py
@@ -15,6 +15,7 @@
 #
 import logging
 from datetime import datetime
+import os
 from typing import Tuple, List
 
 from anthropic import BaseModel
@@ -103,7 +104,8 @@ class SyncLogsService(CommonService):
             Knowledgebase.avatar.alias("kb_avatar"),
             Connector2Kb.auto_parse,
             cls.model.from_beginning.alias("reindex"),
-            cls.model.status
+            cls.model.status,
+            cls.model.update_time
         ]
         if not connector_id:
             fields.append(Connector.config)
@@ -116,7 +118,11 @@ class SyncLogsService(CommonService):
         if connector_id:
             query = query.where(cls.model.connector_id == connector_id)
         else:
-            interval_expr = SQL("INTERVAL `t2`.`refresh_freq` MINUTE")
+            database_type = os.getenv("DB_TYPE", "mysql")
+            if "postgres" in database_type.lower():
+                interval_expr = SQL("make_interval(mins => t2.refresh_freq)")
+            else:
+                interval_expr = SQL("INTERVAL `t2`.`refresh_freq` MINUTE")
             query = query.where(
                 Connector.input_type == InputType.POLL,
                 Connector.status == TaskStatus.SCHEDULE,
diff --git a/sdk/python/ragflow_sdk/modules/document.py b/sdk/python/ragflow_sdk/modules/document.py
index 70c1ac842..c96698079 100644
--- a/sdk/python/ragflow_sdk/modules/document.py
+++ b/sdk/python/ragflow_sdk/modules/document.py
@@ -69,7 +69,7 @@ class Document(Base):
             response = res.json()
             actual_keys = set(response.keys())
             if actual_keys == error_keys:
-                raise Exception(res.get("message"))
+                raise Exception(response.get("message"))
             else:
                 return res.content
         except json.JSONDecodeError:
diff --git a/sdk/python/ragflow_sdk/modules/session.py b/sdk/python/ragflow_sdk/modules/session.py
index 12141afed..d2bbc76e8 100644
--- a/sdk/python/ragflow_sdk/modules/session.py
+++ b/sdk/python/ragflow_sdk/modules/session.py
@@ -80,6 +80,7 @@ class Session(Base):
         
 
     def _structure_answer(self, json_data):
+        answer = ""
         if self.__session_type == "agent":
            answer = json_data["data"]["content"]
         elif self.__session_type == "chat":