{
  "generated_at": "2026-07-19T09:43:44.520126",
  "survivorship_banner": "SURVIVORSHIP BIAS: today's constituents backfilled historically. Absolute Sharpe/CAGR levels on deep history are optimistic. Use RELATIVE signal IC comparisons and era stability only \u2014 not levels.",
  "coverage": {
    "snapshot": "/Users/taathde3/git/lab/signal_platform/backtest_snapshots/prod.sqlite",
    "ticker_count": 506,
    "ohlcv_row_count": 629263,
    "date_range": {
      "min": "2021-06-24",
      "max": "2026-07-02"
    },
    "bars_per_year": [
      {
        "year": "2021",
        "bars": 65678,
        "tickers_with_bars": 494
      },
      {
        "year": "2022",
        "bars": 124423,
        "tickers_with_bars": 497
      },
      {
        "year": "2023",
        "bars": 124479,
        "tickers_with_bars": 499
      },
      {
        "year": "2024",
        "bars": 126129,
        "tickers_with_bars": 501
      },
      {
        "year": "2025",
        "bars": 125615,
        "tickers_with_bars": 504
      },
      {
        "year": "2026",
        "bars": 62939,
        "tickers_with_bars": 505
      }
    ],
    "bars_per_symbol": {
      "min": 14,
      "p10": 1261,
      "p50": 1261,
      "p90": 1261,
      "max": 1261
    },
    "symbols_by_start_year": {
      "2021": 494,
      "2022": 3,
      "2023": 2,
      "2024": 2,
      "2025": 3,
      "2026": 1
    },
    "note": "Where ticker counts drop in early years, the feed (or listing history) thins \u2014 do not treat those years as a full 505-name cross-section.",
    "survivorship_banner": "SURVIVORSHIP BIAS: today's constituents backfilled historically. Absolute Sharpe/CAGR levels on deep history are optimistic. Use RELATIVE signal IC comparisons and era stability only \u2014 not levels."
  },
  "race_guard": null,
  "harness": null,
  "verdict": "COVERAGE_ONLY",
  "verdict_detail": "Coverage probe only; run --phase harness after deep rebuild.",
  "human_next": "- Compare sector residual vs market residual across eras.\n- If pre-2021 IC collapses, park Task 1 wire-in.\n- Do not retune production knobs on deep history levels.",
  "report_path": "reports/history-depth-20260719-094344.json"
}