when in 09/2102 patient 19059 received the triglycerides test for the last time?
select labevents.charttime from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'triglycerides' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 19059 ) and strftime('%y-%m',labevents.charttime) = '2102-09' order by labevents.charttime desc limit 1