{
  "symbol": "ETHBTC",
  "display": "ETHBTC",
  "asset_class": "crypto",
  "timeframe": "W1",
  "rows": 21,
  "start": "2026.05.31 00:00:00",
  "end": "2026.10.18 00:00:00",
  "score": 100,
  "grade": "A",
  "critical_count": 0,
  "warning_count": 0,
  "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": 0,
    "zero_spread_pct": 0.0,
    "negative_spread": 0,
    "extreme_returns": 0,
    "gaps": 0,
    "largest_gap_seconds": 0,
    "largest_gap_start": "",
    "weekend_bars": 0
  },
  "issues": [],
  "generated_at": "2026-11-01",
  "report_url": "/historical-data/data-quality/detail.php?symbol=ETHBTC&tf=W1"
}