feat: 增加学生信息管理功能，优化操行分历史记录展示并更新使用文档

backend/models/conduct.py

@@ -81,7 +81,8 @@ class ConductModel:
         limit: int = 100,
         offset: int = 0,
         start_date: str = None,
-        end_date: str = None
+        end_date: str = None,
+        student_id: int = None
     ) -> List[Dict[str, Any]]:
         """获取所有记录（班主任/班长专用）"""
         # 空字符串转为None
@@ -99,7 +100,9 @@ class ConductModel:
         """
         params = []
         
-        # 单班级系统，无需 class_id 过滤
+        if student_id:
+            sql += " AND cr.student_id = %s"
+            params.append(student_id)
         
         if start_date:
             sql += " AND DATE(cr.created_at) >= %s"
@@ -114,6 +117,73 @@ class ConductModel:
         
         return await execute_query(sql, tuple(params))
     
+    @staticmethod
+    async def get_grouped_records(
+        student_id: int = None,
+        start_date: str = None,
+        end_date: str = None,
+        page: int = 1,
+        page_size: int = 20
+    ) -> Dict[str, Any]:
+        """获取分组后的操行分记录（同批次合并）"""
+        if start_date == "":
+            start_date = None
+        if end_date == "":
+            end_date = None
+        
+        conditions = ["cr.is_revoked = 0"]
+        params = []
+        
+        if student_id:
+            conditions.append("cr.student_id = %s")
+            params.append(student_id)
+        if start_date:
+            conditions.append("cr.created_at >= %s")
+            params.append(start_date)
+        if end_date:
+            conditions.append("cr.created_at <= %s")
+            params.append(end_date + ' 23:59:59')
+        
+        where_clause = " AND ".join(conditions)
+        
+        count_sql = f"""
+            SELECT COUNT(DISTINCT CONCAT(cr.points_change, '|', cr.reason, '|', cr.recorder_id, '|', DATE_FORMAT(cr.created_at, '%Y-%m-%d %H:%i'))) as total
+            FROM conduct_records cr
+            WHERE {where_clause}
+        """
+        
+        data_sql = f"""
+            SELECT
+                cr.points_change,
+                cr.reason,
+                cr.recorder_name,
+                DATE_FORMAT(MIN(cr.created_at), '%Y-%m-%d %H:%i:%s') as created_at,
+                GROUP_CONCAT(s.name ORDER BY s.student_id SEPARATOR ', ') as student_names,
+                COUNT(*) as student_count
+            FROM conduct_records cr
+            JOIN students s ON cr.student_id = s.student_id
+            WHERE {where_clause}
+            GROUP BY cr.points_change, cr.reason, cr.recorder_id, DATE_FORMAT(cr.created_at, '%Y-%m-%d %H:%i')
+            ORDER BY MIN(cr.created_at) DESC
+            LIMIT %s OFFSET %s
+        """
+        
+        params_for_count = list(params)
+        params_for_data = list(params) + [page_size, (page - 1) * page_size]
+        
+        total_result = await execute_one(count_sql, tuple(params_for_count))
+        total = total_result['total'] if total_result else 0
+        
+        records = await execute_query(data_sql, tuple(params_for_data))
+        
+        return {
+            "records": records,
+            "total": total,
+            "page": page,
+            "page_size": page_size,
+            "total_pages": (total + page_size - 1) // page_size
+        }
+    
     @staticmethod
     async def get_record_by_id(record_id: int) -> Optional[Dict[str, Any]]:
         """根据ID获取记录"""