step,rule,n_before,n_after,n_removed,rationale
1,forecast-actual pairs: 10 origins x 2 horizons x 4 models; keep pairs whose target month exists in first_release.csv,80,80,0,all 20 target months (10 per horizon) are present in first_release.csv
2,drop pairs with non-finite forecast,80,80,0,no missing forecasts