{
  "symbol": "SOLUSD",
  "display": "SOLUSD",
  "asset_class": "crypto",
  "timeframe": "M30",
  "rows": 75849,
  "start": "2021.03.11 14:00:00",
  "end": "2026.10.19 10:00:00",
  "score": 59,
  "grade": "F",
  "critical_count": 1,
  "warning_count": 3,
  "checks": {
    "duplicates": 0,
    "out_of_order": 0,
    "ohlc_violations": 0,
    "nonpositive_prices": 11,
    "flat_bars": 0,
    "flat_bars_pct": 0.0,
    "zero_volume": 0,
    "zero_volume_pct": 0.0,
    "zero_spread": 9107,
    "zero_spread_pct": 12.007,
    "negative_spread": 0,
    "extreme_returns": 3,
    "gaps": 8,
    "largest_gap_seconds": 25200,
    "largest_gap_start": "2024.04.01 07:00:00",
    "weekend_bars": 0
  },
  "issues": [
    {
      "severity": "critical",
      "check": "nonpositive_prices",
      "count": 11,
      "message": "Zero or negative price"
    },
    {
      "severity": "warning",
      "check": "gaps",
      "count": 8,
      "message": "Gap greater than 2x timeframe and under 24h"
    },
    {
      "severity": "warning",
      "check": "zero_spread",
      "count": 9107,
      "message": "Zero or missing spread"
    },
    {
      "severity": "warning",
      "check": "extreme_returns",
      "count": 3,
      "message": "Extreme log return"
    }
  ],
  "generated_at": "2026-11-01",
  "report_url": "/historical-data/data-quality/detail.php?symbol=SOLUSD&tf=M30"
}