when was the last time that patient 25815 was measured / taken a measurement of arterial bp mean until 03/04/2103?
select chartevents.charttime from chartevents where chartevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 25815 ) ) and chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'arterial bp mean' and d_items.linksto = 'chartevents' ) and strftime('%y-%m-%d',chartevents.charttime) <= '2103-03-04' order by chartevents.charttime desc limit 1