{
  "claim_boundary": "Counts what is on disk and what pytest collects. It says nothing about data quality, coverage gaps, or whether any of it supports a trading claim \u2014 only how much there is. Runs no backtest, opens no return data, registers no hypothesis. 0 trials.",
  "corrections_this_measurement_forced": [
    "'392K+ point-in-time fundamentals' was OVERSTATED \u2014 the true figure is 380,878. An overstated count is the only kind of staleness that matters.",
    "'8,436 US stocks, survivorship-free' matched neither store and has been replaced by the point-in-time membership count, which is what the phrase means.",
    "'3.5M+ hourly bars' and '2,820+ automated tests' were understated by enough to mislead in the other direction; the '+' made them true and uninformative."
  ],
  "facts": {
    "automated_tests": {
      "definition": "tests pytest collects under tests/, summed from its own per-file collection report",
      "value": 3961
    },
    "crypto_hourly_bars": {
      "definition": "rows across every partition of data/lake/ohlcv, counted from parquet footers",
      "partitions": 2250,
      "value": 13662316
    },
    "crypto_instruments_with_bars": {
      "definition": "distinct instrument ids with at least one hourly bar, live and delisted. NOT the traded universe, which is a much smaller subset chosen by the sleeve's own filters",
      "value": 775
    },
    "equity_daily_bars": {
      "definition": "rows across every partition of data/lake/ohlcv_1d, counted from parquet footers",
      "partitions": 116037,
      "value": 24750503
    },
    "equity_instruments_in_pit_membership": {
      "definition": "distinct US-listed instrument ids the point-in-time universe store has ever admitted \u2014 the narrower answer, and the one that means 'survivorship-free research universe'",
      "value": 6835
    },
    "equity_instruments_with_bars": {
      "definition": "distinct US-listed instrument ids that have at least one daily bar, including delisted ones \u2014 the broadest defensible answer to 'how many stocks'",
      "value": 18015
    },
    "equity_year_span": {
      "definition": "first and last year partition present in the equity daily lake",
      "value": "1997-2026",
      "years": 30
    },
    "point_in_time_fundamentals": {
      "definition": "rows in data/lake/fundamentals \u2014 one (instrument, fiscal period) record carrying an available_at stamp, which is what makes it point-in-time",
      "partitions": 105144,
      "value": 380878
    }
  },
  "schema": "canli.alphac-data-lake-scale.v1",
  "why_each_figure_carries_a_definition": "'How many US stocks' has at least two defensible answers here and they differ by 2.6x: 18,015 instruments have bars, and 6,835 have ever been in the point-in-time universe. Publishing one without saying which it is would replace a stale number with an ambiguous one."
}