diff --git a/main.py b/main.py
index 821ce07..ddb84a7 100644
--- a/main.py
+++ b/main.py
@@ -22,23 +22,20 @@ class BaseResponse(BaseModel):
 # 设备注册实体
 class Device(BaseModel):
     iccid: str = ""
-    deviceId: str = ""
+    deviceId: str
     type: int = None
 
 
 # 数据查询参数实体
 class DataQuery(BaseModel):
     deviceId: str
-    limit: int = 1
-
 
 # 数据查询接口
 @app.post("/api/xumu/data/query")
 async def data_query(params: DataQuery):
     try:
         deviceId = params.deviceId
-        limit = params.limit
-        sql = f"select * from root.farm.{deviceId} order by time desc limit {limit}"
+        sql = f"select last * from root.farm.{deviceId}"
         send_json = {
             "sql": sql
         }
@@ -95,6 +92,9 @@ async def register(request: Request):
         deviceId = payload["d"]
         iccid = payload["cid"]
         type = payload["t"]
+        # TODO 检测该设备是否已经创建
+
+        # 创建该设备
         send_json = {
             "devices": ["root.device"],
             "timestamps": [int(time.time() * 1000)],