curl --request GET \
  --url https://cloud.onyx.app/api/analytics/assistant/{assistant_id}/stats \
  --header 'Authorization: Bearer <token>'

{
  "daily_stats": [
    {
      "date": "2023-12-25",
      "total_messages": 123,
      "total_unique_users": 123
    }
  ],
  "total_messages": 123,
  "total_unique_users": 123
}