{
  "fund": "南方纳指100 (全链路估算)",
  "update_time": "2026-09-29T10:32:55.750Z",
  "date_debug": {
    "T": "2026-09-29",
    "T1": "2026-09-28"
  },
  "prices": {
    "2026-09-29": {
      "nav": 2.3507,
      "change": "+1.01%"
    },
    "2026-09-28": {
      "nav": 2.3272,
      "change": "-1.08%"
    },
    "2026-09-24": {
      "nav": 2.3527,
      "change": "+0.06%"
    },
    "2026-09-23": {
      "nav": 2.3514,
      "change": "-0.81%"
    },
    "2026-09-22": {
      "nav": 2.3705,
      "change": "+0.74%"
    },
    "2026-09-21": {
      "nav": 2.353,
      "change": "+2.65%"
    },
    "2026-09-18": {
      "nav": 2.2922,
      "change": "--"
    }
  },
  "debug_info": {
    "future": {
      "method": "Futures Avg(100) / Index Prev Close",
      "future_avg": 30581.5075,
      "future_count": 100,
      "index_prev_close": 30276.81,
      "expression": "30581.51 / 30276.81"
    },
    "spot_T1_est": true,
    "spot": {
      "expression": "30276.81 (T-1) / 30608.13 (T-2)",
      "date_range": "2026-09-25 -> 2026-09-28"
    }
  }
}