curl --request POST \
  --url https://api.neoagent.io/public-api/backfills/{backfill_id}/cancel \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "backfill_id": "<string>",
    "message": "<string>",
    "signal": "<string>"
  },
  "meta": {
    "request_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "timings_ms": {},
    "pagination": {
      "has_more": true,
      "next_cursor": "<string>"
    },
    "warnings": [
      "<string>"
    ]
  }
}