{
  "version": "C6-data-20261111-issuer-overlay-v1",
  "accepted_for_research": true,
  "start": "2007-05-30",
  "end": "2026-11-10",
  "sessions_per_symbol": 4895,
  "symbols": [
    "SPY",
    "TLT",
    "GLD",
    "BIL"
  ],
  "method": "For each confirmed Oct/Nov event multiply all earlier vendor adjusted prices by (1-official_cash/previous_close)/observed_vendor_factor. Preserve raw closes and other daily returns. Yahoo-compatible previous-close adjustment proxy, not actual pay-date reinvestment.",
  "issuer_events_and_factors": [
    {
      "symbol": "BIL",
      "ex_date": "2026-10-01",
      "cash": 0.263176,
      "pay_date": "2026-10-06",
      "source": "ssga_issuer",
      "file": "issuer/spdr.xlsx",
      "source_sha256": "4add18439e505ba6c114bea5d352ac68b1ea5420bc99abdf2e21500dd6f1faa2",
      "locator": "dividend!A4:J4",
      "previous_date": "2026-09-30",
      "previous_close": 91.63999938964844,
      "vendor_event_amount": 0.263,
      "vendor_implied_factor": 0.9971300688560354,
      "issuer_factor": 0.9971281536255693,
      "history_multiplier": 0.9999980792571341,
      "affected_rows": 4866
    },
    {
      "symbol": "BIL",
      "ex_date": "2026-11-02",
      "cash": 0.308493,
      "pay_date": "2026-11-05",
      "source": "ssga_issuer",
      "file": "issuer/spdr.xlsx",
      "source_sha256": "4add18439e505ba6c114bea5d352ac68b1ea5420bc99abdf2e21500dd6f1faa2",
      "locator": "dividend!A3:J3",
      "previous_date": "2026-10-30",
      "previous_close": 91.69999694824219,
      "vendor_event_amount": null,
      "vendor_implied_factor": 1.0,
      "issuer_factor": 0.9966358450352608,
      "history_multiplier": 0.9966358450352608,
      "affected_rows": 4888
    },
    {
      "symbol": "TLT",
      "ex_date": "2026-10-01",
      "cash": 0.311581,
      "pay_date": "2026-10-06",
      "source": "ishares_issuer",
      "file": "issuer/tlt.html",
      "source_sha256": "7e14fbf62d0f958ca755b337d7ca0605bee4625120168a1c2745be61ff0a46e9",
      "locator": "Distributions table, Ex-Date=Oct 01, 2026",
      "previous_date": "2026-09-30",
      "previous_close": 77.77999877929688,
      "vendor_event_amount": 0.312,
      "vendor_implied_factor": 0.9959886333986608,
      "issuer_factor": 0.9959940729636148,
      "history_multiplier": 1.000005461472924,
      "affected_rows": 4866
    },
    {
      "symbol": "TLT",
      "ex_date": "2026-11-02",
      "cash": 0.343177,
      "pay_date": "2026-11-05",
      "source": "ishares_issuer",
      "file": "issuer/tlt.html",
      "source_sha256": "7e14fbf62d0f958ca755b337d7ca0605bee4625120168a1c2745be61ff0a46e9",
      "locator": "Distributions table, Ex-Date=Nov 02, 2026",
      "previous_date": "2026-10-30",
      "previous_close": 81.83999633789062,
      "vendor_event_amount": null,
      "vendor_implied_factor": 1.0,
      "issuer_factor": 0.9958067324614345,
      "history_multiplier": 0.9958067324614345,
      "affected_rows": 4888
    }
  ],
  "independent_event_return_checks": [
    {
      "symbol": "TLT",
      "date": "2026-10-01",
      "before_return": 0.0031239274425503005,
      "after_return": 0.003118448938302043,
      "expected_return": 0.003118448938302043,
      "error": 0.0
    },
    {
      "symbol": "TLT",
      "date": "2026-11-02",
      "before_return": -0.0013440003162134007,
      "after_return": 0.0028612652731412336,
      "expected_return": 0.0028612652731412336,
      "error": 0.0
    },
    {
      "symbol": "BIL",
      "date": "2026-10-01",
      "before_return": 0.00036119331055961545,
      "after_return": 0.00036311475087558165,
      "expected_return": 0.00036311475087558165,
      "error": 0.0
    },
    {
      "symbol": "BIL",
      "date": "2026-11-02",
      "before_return": -0.003162413258274044,
      "after_return": 0.000202422687755055,
      "expected_return": 0.000202422687755055,
      "error": 0.0
    }
  ],
  "max_non_event_return_change": 4.440892098500626e-16,
  "raw_prices_unchanged": true,
  "original_frozen_and_vendor_snapshot_preserved": true,
  "production_database_manual_changes": false,
  "limits": [
    "Only TLT/BIL Oct/Nov 2026 issuer events independently reconciled here; not all historical corporate actions certified",
    "No automatic production overlay deployment; original vendor snapshot fails November event completeness",
    "Historical availability/issuer announcement-time backtest leakage not certified; private retrospective research only"
  ],
  "input_sha256": {
    "snapshot/frozen_bars.csv": "82ef14724038a956b8008483eaae57e766682fc444f665ae324cd5b6d27ff676",
    "snapshot/frozen_actions.csv": "e20023a729004a0067624159475686e8fe5d3be0d5a1519b1f2a4335b29a3a4d",
    "issuer/tlt.html": "7e14fbf62d0f958ca755b337d7ca0605bee4625120168a1c2745be61ff0a46e9",
    "issuer/spdr.xlsx": "4add18439e505ba6c114bea5d352ac68b1ea5420bc99abdf2e21500dd6f1faa2"
  },
  "output_sha256": {
    "frozen_actions.csv": "ee99b5d857b703efaa1796ea06e2b4c72994d531d239caf9fff72181795eab61",
    "frozen_bars.csv": "5c21b931f97610bd7c8788b2dedc19e85cd4221216ed021dd8f6d8956d0d76e8",
    "issuer_events.json": "1925a8ce9bae3aa2a2b27c9a152fb69ba5ed7d5a1919a1dade0bc6bf7e6b04b0"
  }
}