{
  "task_id": "F6-conf-02",
  "sample_start": "2010-01-04",
  "sample_end": "2019-12-31",
  "n_treated": 0,
  "baseline_metric": -0.042851,
  "model_metric": null,
  "effect_estimate": null,
  "effect_ci_low": null,
  "effect_ci_high": null,
  "conclusion": "premise_invalid",
  "feasibility": "infeasible",
  "feasibility_reason": "The file contains no rows with post_cut = 1 (sample ends 2019-12-31, before the 2020-03-04 cut), so neither the post-cut window nor the '120 trading days before the first flagged day' window exists; the effect, its interval and the two-window RMSE cannot be computed.",
  "data_issues": [
    {
      "issue": "No rows with post_cut = 1: the file covers 2010-01-04 to 2019-12-31 (README retrieval used end_date=2019-12-31), entirely before the 2020-03-04 cut, so the post-cut window is empty.",
      "handling": "Estimand declared not computable (premise_invalid); effect, CI, model_metric and n_analysed set to null. No proxy or substitute data used."
    },
    {
      "issue": "Calendar gaps between consecutive rows up to 5 days (weekends/holidays; max gaps around year-end).",
      "handling": "Per task rules, one-day change is defined between consecutive rows regardless of calendar gap; no adjustment."
    }
  ],
  "n_input_rows": {
    "gc5y_daily.csv": 2498
  },
  "n_analysed": null,
  "random_seed": null,
  "audit_n_changes": 2497,
  "audit_sd_change_bp": 4.236329,
  "audit_input_sha256": "2cdda6ccb2147c8861997166cb0d32cf85ff2744e1e7c0f47eded0f354c2db51"
}