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    {
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      "to_contract": "HGQ24-COMEX",
      "decision_session": "2024-07-17",
      "old_volume": 35,
      "new_volume": 179,
      "switch_utc": "2024-07-17T22:00:00+00:00",
      "difference": -0.004999999999999893
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    {
      "from_contract": "HGQ24-COMEX",
      "to_contract": "HGU24-COMEX",
      "decision_session": "2024-07-29",
      "old_volume": 178,
      "new_volume": 44250,
      "switch_utc": "2024-07-29T22:00:00+00:00",
      "difference": 0.020500000000000185
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    {
      "from_contract": "HGU24-COMEX",
      "to_contract": "HGV24-COMEX",
      "decision_session": "2024-09-17",
      "old_volume": 81,
      "new_volume": 110,
      "switch_utc": "2024-09-17T22:00:00+00:00",
      "difference": 0.013500000000000512
    },
    {
      "from_contract": "HGV24-COMEX",
      "to_contract": "HGX24-COMEX",
      "decision_session": "2024-10-03",
      "old_volume": 41,
      "new_volume": 262,
      "switch_utc": "2024-10-03T22:00:00+00:00",
      "difference": 0.02549999999999919
    },
    {
      "from_contract": "HGX24-COMEX",
      "to_contract": "HGZ24-COMEX",
      "decision_session": "2024-10-28",
      "old_volume": 82,
      "new_volume": 34295,
      "switch_utc": "2024-10-28T22:00:00+00:00",
      "difference": 0.0259999999999998
    },
    {
      "from_contract": "HGZ24-COMEX",
      "to_contract": "HGF25-COMEX",
      "decision_session": "2024-11-29",
      "old_volume": 108,
      "new_volume": 163,
      "switch_utc": "2024-12-01T23:00:00+00:00",
      "difference": 0.0235000000000003
    },
    {
      "from_contract": "HGF25-COMEX",
      "to_contract": "HGG25-COMEX",
      "decision_session": "2025-01-16",
      "old_volume": 20,
      "new_volume": 75,
      "switch_utc": "2025-01-16T23:00:00+00:00",
      "difference": 0.008500000000000618
    },
    {
      "from_contract": "HGG25-COMEX",
      "to_contract": "HGH25-COMEX",
      "decision_session": "2025-01-27",
      "old_volume": 79,
      "new_volume": 41093,
      "switch_utc": "2025-01-27T23:00:00+00:00",
      "difference": 0.024499999999999744
    },
    {
      "from_contract": "HGH25-COMEX",
      "to_contract": "HGJ25-COMEX",
      "decision_session": "2025-03-21",
      "old_volume": 33,
      "new_volume": 122,
      "switch_utc": "2025-03-23T22:00:00+00:00",
      "difference": 0.0005000000000006111
    },
    {
      "from_contract": "HGJ25-COMEX",
      "to_contract": "HGK25-COMEX",
      "decision_session": "2025-03-31",
      "old_volume": 193,
      "new_volume": 43450,
      "switch_utc": "2025-03-31T22:00:00+00:00",
      "difference": 0.014000000000000234
    },
    {
      "from_contract": "HGK25-COMEX",
      "to_contract": "HGM25-COMEX",
      "decision_session": "2025-04-30",
      "old_volume": 611,
      "new_volume": 664,
      "switch_utc": "2025-04-30T22:00:00+00:00",
      "difference": 0.02400000000000002
    },
    {
      "from_contract": "HGM25-COMEX",
      "to_contract": "HGN25-COMEX",
      "decision_session": "2025-05-27",
      "old_volume": 86,
      "new_volume": 34471,
      "switch_utc": "2025-05-27T22:00:00+00:00",
      "difference": 0.024499999999999744
    },
    {
      "from_contract": "HGN25-COMEX",
      "to_contract": "HGU25-COMEX",
      "decision_session": "2025-06-30",
      "old_volume": 220,
      "new_volume": 19794,
      "switch_utc": "2025-06-30T22:00:00+00:00",
      "difference": 0.052999999999999936
    },
    {
      "from_contract": "HGU25-COMEX",
      "to_contract": "HGZ25-COMEX",
      "decision_session": "2025-08-27",
      "old_volume": 5069,
      "new_volume": 26818,
      "switch_utc": "2025-08-27T22:00:00+00:00",
      "difference": 0.07650000000000023
    },
    {
      "from_contract": "HGZ25-COMEX",
      "to_contract": "HGF26-COMEX",
      "decision_session": "2025-12-10",
      "old_volume": 23,
      "new_volume": 164,
      "switch_utc": "2025-12-10T23:00:00+00:00",
      "difference": 0.020999999999999908
    },
    {
      "from_contract": "HGF26-COMEX",
      "to_contract": "HGG26-COMEX",
      "decision_session": "2025-12-31",
      "old_volume": 20,
      "new_volume": 96,
      "switch_utc": "2025-12-31T23:00:00+00:00",
      "difference": 0.020999999999999908
    },
    {
      "from_contract": "HGG26-COMEX",
      "to_contract": "HGH26-COMEX",
      "decision_session": "2026-01-26",
      "old_volume": 230,
      "new_volume": 58580,
      "switch_utc": "2026-01-26T23:00:00+00:00",
      "difference": 0.029500000000000526
    },
    {
      "from_contract": "HGH26-COMEX",
      "to_contract": "HGJ26-COMEX",
      "decision_session": "2026-03-20",
      "old_volume": 66,
      "new_volume": 368,
      "switch_utc": "2026-03-22T22:00:00+00:00",
      "difference": 0.0034999999999998366
    },
    {
      "from_contract": "HGJ26-COMEX",
      "to_contract": "HGK26-COMEX",
      "decision_session": "2026-03-30",
      "old_volume": 116,
      "new_volume": 29069,
      "switch_utc": "2026-03-30T22:00:00+00:00",
      "difference": 0.02600000000000069
    },
    {
      "from_contract": "HGK26-COMEX",
      "to_contract": "HGM26-COMEX",
      "decision_session": "2026-05-12",
      "old_volume": 63,
      "new_volume": 836,
      "switch_utc": "2026-05-12T22:00:00+00:00",
      "difference": 0.016499999999999737
    },
    {
      "from_contract": "HGM26-COMEX",
      "to_contract": "HGN26-COMEX",
      "decision_session": "2026-05-26",
      "old_volume": 240,
      "new_volume": 29598,
      "switch_utc": "2026-05-26T22:00:00+00:00",
      "difference": 0.028500000000000192
    },
    {
      "from_contract": "HGN26-COMEX",
      "to_contract": "HGQ26-COMEX",
      "decision_session": "2026-07-10",
      "old_volume": 21,
      "new_volume": 128,
      "switch_utc": "2026-07-12T22:00:00+00:00",
      "difference": 0.016499999999999737
    },
    {
      "from_contract": "HGQ26-COMEX",
      "to_contract": "HGU26-COMEX",
      "decision_session": "2026-07-28",
      "old_volume": 111,
      "new_volume": 28349,
      "switch_utc": "2026-07-28T22:00:00+00:00",
      "difference": 0.03200000000000003
    },
    {
      "from_contract": "HGU26-COMEX",
      "to_contract": "HGV26-COMEX",
      "decision_session": "2026-09-03",
      "old_volume": 100,
      "new_volume": 302,
      "switch_utc": "2026-09-03T22:00:00+00:00",
      "difference": 0.022499999999999964
    },
    {
      "from_contract": "HGV26-COMEX",
      "to_contract": "HGX26-COMEX",
      "decision_session": "2026-10-05",
      "old_volume": 14,
      "new_volume": 444,
      "switch_utc": "2026-10-05T22:00:00+00:00",
      "difference": 0.022999999999999687
    },
    {
      "from_contract": "HGX26-COMEX",
      "to_contract": "HGZ26-COMEX",
      "decision_session": "2026-10-21",
      "old_volume": 111,
      "new_volume": 30513,
      "switch_utc": "2026-10-21T22:00:00+00:00",
      "difference": 0.028500000000000192
    }
  ]
}