curl --request POST \
  --url https://api.platform.dakota.xyz/internal/unit21-queue \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "content": {},
  "type": "entity",
  "external_id": "cust_abc123",
  "next_attempt_at": 1735693200,
  "failed_count": 0,
  "is_dead": false
}
'

{
  "id": "12345",
  "content": {},
  "type": "entity",
  "created_at": 1735693200,
  "failed_count": 0,
  "is_dead": false,
  "external_id": "cust_abc123",
  "completed_at": 1735693200,
  "next_attempt_at": 1735693200
}