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      "decision_session": "2025-05-28",
      "old_volume": 147382,
      "new_volume": 276072,
      "switch_utc": "2025-05-28T22:00:00+00:00",
      "difference": -0.34375
    },
    {
      "from_contract": "ZBU25-CBOT",
      "to_contract": "ZBZ25-CBOT",
      "decision_session": "2025-08-27",
      "old_volume": 123245,
      "new_volume": 258744,
      "switch_utc": "2025-08-27T22:00:00+00:00",
      "difference": -0.375
    },
    {
      "from_contract": "ZBZ25-CBOT",
      "to_contract": "ZBH26-CBOT",
      "decision_session": "2025-11-25",
      "old_volume": 235915,
      "new_volume": 316171,
      "switch_utc": "2025-11-25T23:00:00+00:00",
      "difference": -0.375
    },
    {
      "from_contract": "ZBH26-CBOT",
      "to_contract": "ZBM26-CBOT",
      "decision_session": "2026-02-25",
      "old_volume": 108131,
      "new_volume": 220214,
      "switch_utc": "2026-02-25T23:00:00+00:00",
      "difference": -0.4375
    },
    {
      "from_contract": "ZBM26-CBOT",
      "to_contract": "ZBU26-CBOT",
      "decision_session": "2026-05-27",
      "old_volume": 108468,
      "new_volume": 321512,
      "switch_utc": "2026-05-27T22:00:00+00:00",
      "difference": -0.5
    },
    {
      "from_contract": "ZBU26-CBOT",
      "to_contract": "ZBZ26-CBOT",
      "decision_session": "2026-08-27",
      "old_volume": 84216,
      "new_volume": 301849,
      "switch_utc": "2026-08-27T22:00:00+00:00",
      "difference": -0.5
    }
  ]
}