跨域bug修复2

backend/models/conduct.py

@@ -78,7 +78,6 @@ class ConductModel:
     
     @staticmethod
     async def get_all_records(
-        class_id: int = None,
         limit: int = 100,
         offset: int = 0,
         start_date: str = None,
@@ -94,9 +93,7 @@ class ConductModel:
         """
         params = []
         
-        if class_id:
-            sql += " AND s.class_id = %s"
-            params.append(class_id)
+        # 单班级系统，无需 class_id 过滤
         
         if start_date:
             sql += " AND DATE(cr.created_at) >= %s"