{
  "schema_version": "finance1000-split-v1",
  "indexing": "zero-based, stop indices are end-exclusive",
  "total_rows": 28510,
  "train": {
    "start": 0,
    "stop": 19957,
    "rows": 19957,
    "first_timestamp_utc": "2015-01-02T15:00:00Z",
    "last_timestamp_utc": "2022-10-22T20:00:00Z"
  },
  "test": {
    "start": 19957,
    "stop": 28510,
    "rows": 8553,
    "first_timestamp_utc": "2022-10-23T14:00:00Z",
    "last_timestamp_utc": "2026-02-25T20:00:00Z"
  },
  "window": {
    "context_rows": 96,
    "horizon_rows": 1,
    "first_test_context_start": 19861,
    "first_test_context_stop": 19957,
    "first_test_target": 19957
  },
  "evaluation": {
    "target_indices": "range(19957, 28510, 4)",
    "stride": 4,
    "count": 2139,
    "first_target_index": 19957,
    "last_target_index": 28509
  },
  "calendar": {
    "timezone": "America/New_York converted to UTC",
    "local_hours_inclusive": "10:00 through 16:00",
    "frequency": "1 hour",
    "includes_weekends": true,
    "includes_market_holidays": true,
    "warning": "The stored benchmark timeline is a regular calendar-day grid, not an exchange-session calendar. Forward fill therefore creates zero log changes on many non-trading rows."
  },
  "policy_warning": "This is the final AAAI chronological 70/30 split. Older foundation scripts with periodic 70/10/20 splits are not part of the locked paper protocol."
}