增加水准编码查询账号接口

app/services/level_data.py

@@ -30,6 +30,12 @@ class LevelDataService(BaseService[LevelData]):
         """根据水准线路编码获取水准数据"""
         return self.get_by_field(db, "linecode", linecode)
 
+    def get_last_by_linecode(self, db: Session, linecode: str) -> Optional[LevelData]:
+        """根据水准线路编码获取最新的水准数据（按NYID降序）"""
+        return db.query(LevelData).filter(
+            LevelData.linecode == linecode
+        ).order_by(LevelData.NYID.desc()).first()
+
     def search_level_data(self, db: Session,
                           id: Optional[str] = None,
                          linecode: Optional[str] = None,