1step,rule,n_before,n_after,n_removed,rationale2S0,read file; no filtering applied (no missing/duplicate/unparseable rows found),2498,2498,0,audit found no rows requiring removal3S1,keep rows in the two estimation windows (120 pre-window days + post_cut=1 days),2498,0,2498,"no post_cut=1 rows exist, so the windows are undefined and no row enters the effect estimate"4