{
  "schema": "LOC011_LAB_FIXTURES_v1",
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      "terminal_result": null
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      "expires_at": 240,
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      "ack_state": "ACKED",
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      "progress_value_current": 25,
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      "message_generation": 8,
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      "message_holder": "worker-B",
      "now": 220,
      "expires_at": 260,
      "ack_state": "ACKED",
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      "terminal_result": null
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      "message_holder": "worker-B",
      "now": 251,
      "expires_at": 250,
      "ack_state": "ACKED",
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      "progress_sequence_current": 14,
      "progress_sequence_message": 15,
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      "progress_value_message": 80,
      "cancel_requested": true,
      "cancel_ack": false,
      "terminal_result": null
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    {
      "id": "duplicate_renew",
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      "message_generation": 8,
      "current_holder": "worker-B",
      "message_holder": "worker-B",
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      "expires_at": 260,
      "ack_state": "ACKED",
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      "terminal_result": null
    },
    {
      "id": "ownership_conflict",
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      "message_generation": 8,
      "current_holder": "worker-B",
      "message_holder": "worker-C",
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      "expires_at": 260,
      "ack_state": "ACKED",
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      "cancel_requested": false,
      "terminal_result": null
    },
    {
      "id": "streaming_transfer_reordered",
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      "message_generation": 9,
      "current_holder": "worker-D",
      "message_holder": "worker-D",
      "now": 300,
      "expires_at": 340,
      "ack_state": "ACKED",
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      "cancel_requested": false,
      "terminal_result": null,
      "transport": "stream",
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    }
  ]
}