diff --git a/api/app/controllers/app_log_controller.py b/api/app/controllers/app_log_controller.py
index a8f6d532..dfd10644 100644
--- a/api/app/controllers/app_log_controller.py
+++ b/api/app/controllers/app_log_controller.py
@@ -2,7 +2,7 @@
 import uuid
 from typing import Optional
 
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, Query
 from sqlalchemy import select, desc, func
 from sqlalchemy.orm import Session
 
@@ -23,8 +23,8 @@ logger = get_business_logger()
 @cur_workspace_access_guard()
 def list_app_logs(
         app_id: uuid.UUID,
-        page: int = 1,
-        pagesize: int = 20,
+        page: int = Query(1, ge=1),
+        pagesize: int = Query(20, ge=1, le=100),
         user_id: Optional[str] = None,
         is_draft: Optional[bool] = None,
         db: Session = Depends(get_db),
diff --git a/api/app/schemas/app_log_schema.py b/api/app/schemas/app_log_schema.py
index e386b5e9..bda78138 100644
--- a/api/app/schemas/app_log_schema.py
+++ b/api/app/schemas/app_log_schema.py
@@ -50,4 +50,4 @@ class AppLogConversation(BaseModel):
 
 class AppLogConversationDetail(AppLogConversation):
     """会话详情（包含消息列表）"""
-    messages: List[AppLogMessage] = []
+    messages: List[AppLogMessage] = Field(default_factory=list)