curl --request GET \
  --url http://localhost:8000/api/v1/google-ads/device-performance \
  --header 'Authorization: Bearer <token>'

{
  "device_performance": [
    {
      "device_type": "<string>",
      "impressions": 123,
      "clicks": 123,
      "ctr": 123,
      "cost": 123,
      "conversions": 123,
      "cost_per_conversion": 123,
      "conversion_rate": 123,
      "percentage_of_total_impressions": 123
    }
  ],
  "time_period": "<string>",
  "total_impressions": 123,
  "total_clicks": 123,
  "total_cost": 123,
  "total_conversions": 123
}