curl --request GET \
  --url https://api.production.hyperoru.com/api/klines/backfill-tasks \
  --header 'Authorization: Bearer <token>'

{
  "tasks": [
    {
      "environment": "<string>",
      "exchange": "<string>",
      "id": 123,
      "status": "<string>",
      "finished_at": "<string>",
      "period": "<string>",
      "rows_written": 123,
      "started_at": "<string>",
      "symbol": "<string>"
    }
  ]
}