时间格式，获取沉降数据接口limit

app/api/comprehensive_data.py

@@ -176,7 +176,7 @@ def get_section(request: SectionDataQueryRequest, db: Session = Depends(get_db))
 # 根据观测点id查询沉降数据
 @router.post("/get_settlement", response_model=DataResponse)
 def get_settlement(request: SettlementDataQueryRequest, db: Session = Depends(get_db)):
-    """获取沉降数据"""
+    """获取沉降数据，按上传时间倒序排序，支持limit参数限制返回数量"""
     try:
         logger.info(f"Querying settlement data with params: {request.dict()}")
 
@@ -187,7 +187,8 @@ def get_settlement(request: SettlementDataQueryRequest, db: Session = Depends(ge
             point_id=request.point_id,
             nyid=request.NYID,
             sjName=request.sjName,
-            workinfoname=request.workinfoname
+            workinfoname=request.workinfoname,
+            limit=request.limit
         )
 
         logger.info(f"Found {len(result_data)} settlement records")