{
  "symbol": "BTCZAR",
  "display": "BTCZAR",
  "asset_class": "crypto",
  "timeframe": "M30",
  "rows": 98258,
  "start": "2021.02.28 09:00:00",
  "end": "2026.10.19 10:30:00",
  "score": 100.0,
  "grade": "A",
  "critical_count": 0,
  "warning_count": 2,
  "checks": {
    "duplicates": 0,
    "out_of_order": 0,
    "ohlc_violations": 0,
    "nonpositive_prices": 0,
    "flat_bars": 0,
    "flat_bars_pct": 0.0,
    "zero_volume": 0,
    "zero_volume_pct": 0.0,
    "zero_spread": 2,
    "zero_spread_pct": 0.002,
    "negative_spread": 0,
    "extreme_returns": 0,
    "gaps": 12,
    "largest_gap_seconds": 81000,
    "largest_gap_start": "2024.11.02 23:30:00",
    "weekend_bars": 0
  },
  "issues": [
    {
      "severity": "warning",
      "check": "gaps",
      "count": 12,
      "message": "Gap greater than 2x timeframe and under 24h"
    },
    {
      "severity": "warning",
      "check": "zero_spread",
      "count": 2,
      "message": "Zero or missing spread"
    }
  ],
  "generated_at": "2026-11-01",
  "report_url": "/historical-data/data-quality/detail.php?symbol=BTCZAR&tf=M30"
}