{
  "fund": "南方纳指100 (全链路估算)",
  "update_time": "2026-08-01T10:29:50.922Z",
  "date_debug": {
    "T": "2026-07-31",
    "T1": "2026-07-30"
  },
  "prices": {
    "2026-07-31": {
      "nav": 2.1997,
      "change": "+0.49%"
    },
    "2026-07-30": {
      "nav": 2.1889,
      "change": "+3.20%"
    },
    "2026-07-29": {
      "nav": 2.121,
      "change": "-2.00%"
    },
    "2026-07-28": {
      "nav": 2.1642,
      "change": "-0.91%"
    },
    "2026-07-27": {
      "nav": 2.184,
      "change": "-0.34%"
    },
    "2026-07-24": {
      "nav": 2.1914,
      "change": "-1.06%"
    },
    "2026-07-23": {
      "nav": 2.2149,
      "change": "--"
    }
  },
  "debug_info": {
    "future": {
      "method": "Futures Avg(100) / Index Prev Close",
      "future_avg": 28413.985,
      "future_count": 100,
      "index_prev_close": 28274.2,
      "expression": "28413.99 / 28274.20"
    },
    "spot_T1_est": false,
    "spot": {
      "expression": "28274.2 (T-1) / 28106.35 (T-2)",
      "date_range": "2026-07-30 -> 2026-07-31"
    }
  }
}