线路获取point_id修改：水准最大期

app/services/checkpoint.py

@@ -247,6 +247,10 @@ class CheckpointService(BaseService[Checkpoint]):
         if not nyid_list:
             return []
 
+        max_nyid_str = max(nyid_list, key=int)
+        nyid_list = []
+        nyid_list.append(max_nyid_str)
+
         # 2. 根据NYID列表查询沉降数据表，获取所有point_id（去重）
         point_id_query = db.query(SettlementData.point_id).filter(
             SettlementData.NYID.in_(nyid_list)