{
  "fund": "南方纳指100 (全链路估算)",
  "update_time": "2026-04-05T14:13:25.358Z",
  "date_debug": {
    "T": "2026-04-02",
    "T1": "2026-04-01"
  },
  "prices": {
    "2026-04-02": {
      "nav": 1.9293,
      "change": "+0.54%"
    },
    "2026-04-01": {
      "nav": 1.919,
      "change": "+0.88%"
    },
    "2026-03-31": {
      "nav": 1.9022,
      "change": "+3.21%"
    },
    "2026-03-30": {
      "nav": 1.8431,
      "change": "-0.63%"
    },
    "2026-03-27": {
      "nav": 1.8547,
      "change": "-1.71%"
    },
    "2026-03-26": {
      "nav": 1.8869,
      "change": "-2.06%"
    },
    "2026-03-25": {
      "nav": 1.9265,
      "change": "--"
    }
  },
  "debug_info": {
    "future": {
      "method": "Futures Avg(100) / Index Prev Close",
      "future_avg": 24174.075,
      "future_count": 100,
      "index_prev_close": 24045.53,
      "expression": "24174.08 / 24045.53",
      "note": "Fallback used"
    },
    "spot_T1_est": false,
    "spot": {
      "expression": "24045.53 (T-1) / 24019.99 (T-2)",
      "date_range": "2026-04-01 -> 2026-04-02"
    }
  }
}