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

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