Fix:RagFlow not starting with Postgres DB (#11398)

### What problem does this PR solve?
issue:
#11293 
change:
RagFlow not starting with Postgres DB
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

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)
@@ -115,6 +117,10 @@ class SyncLogsService(CommonService):
 
         if connector_id:
             query = query.where(cls.model.connector_id == connector_id)
+        else:
+            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(