add models and validation

internal/domains/sensors/models.go

@@ -24,6 +24,17 @@ type Sensor struct {
 }
 
 type SensorData struct {
-	Value     float64   `json:"value"`
+	SensorID  string    `json:"sensor_id"`
+	Value     *float64  `json:"value"`
 	Timestamp time.Time `json:"timestamp"`
 }
+
+type SensorRequest struct {
+	SensorID string `json:"sensor_id"`
+}
+
+type SensorDataRequest struct {
+	SensorID string `json:"sensor_id"`
+	From     string `json:"from"`
+	To       string `json:"to"`
+}