{
  "task_id": "F6-conf-02",
  "sample_start": "2010-01-04",
  "sample_end": "2019-12-31",
  "n_treated": 0,
  "baseline_metric": -0.042851421706047235,
  "model_metric": null,
  "effect_estimate": null,
  "effect_ci_low": null,
  "effect_ci_high": null,
  "conclusion": "premise_invalid",
  "feasibility": "infeasible",
  "feasibility_reason": "The file covers 2010-01-04 to 2019-12-31 and contains no rows with post_cut = 1 (the cut was announced 2020-03-04, after the last date). The post-cut mean change, and hence the effect, its interval and the two-window model RMSE, cannot be computed. No proxy estimate is substituted.",
  "data_issues": [
    {
      "issue": "Sample ends 2019-12-31, before the 2020-03-04 cut; n_treated = 0 (all 2498 rows have post_cut = 0). The README retrieval URL requests end_date=2019-12-31, consistent with this truncation.",
      "handling": "Estimand declared not estimable: effect_estimate, CI, model_metric, n_analysed set to null; conclusion premise_invalid."
    }
  ],
  "n_input_rows": {
    "gc5y_daily.csv": 2498
  },
  "n_analysed": null,
  "random_seed": null
}