1step,rule,n_before,n_after,n_removed,rationale21_splice,drop 2016-07-15 vintage rows for months covered by the 2026-10-28 vintage,987,957,30,information rule: use most recent vintage in which the month is available32_window,keep months 2001-01 .. 2026-09,957,309,648,estimation window defined in TASK.md43_computable,drop months where P_t or P_{t-12} is missing in the sources,309,308,1,no interpolation/imputation allowed; missing months: 2025-105