Refactor RoomDataRangeResponse to use SensorData schema for improved data structure

backend/app/schemas/sensor.py

@@ -2,15 +2,24 @@ from ninja import Schema
 from typing import List, Dict, Optional
 
 
-class RoomDataPoint(Schema):
-    time: str
-    field: str
-    value: float
+from datetime import datetime
+
+
+class SensorData(Schema):
+    co2: int
+    humidity: float
+    temperature: float
 
 
 class RoomDataRangeResponse(Schema):
     room: str
-    data: Dict[str, Dict[str, float]]
+    data: Dict[datetime, SensorData]
+
+
+class RoomDataPoint(Schema):
+    time: str
+    field: str
+    value: float
 
 
 class GetRoomsResponse(Schema):