curl --request POST \
  --url https://api.example.com/api/v1/lineup/slots/{slot_id}/assets \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "document_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "medium": "TV",
  "channel": "TV47",
  "month": 5,
  "year": 2026,
  "title": "TV47 MAY 2026",
  "version": 1,
  "effective_from": "2026-05-01",
  "effective_to": "2026-05-31",
  "uploaded_by": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "John Doe",
    "employee_number": "EMP-001"
  },
  "slot_count": {
    "2026-05-01": {
      "day": "THU",
      "count": 12
    }
  },
  "metadata": {},
  "created_at": "2026-05-01T08:00:00Z",
  "updated_at": "2026-05-01T08:00:00Z"
}