#check_presence<-function(u){
# conn<- adminKraken::con_mysql()
#qry_str<-paste0('select DISTINCT(sn) from mvdata where Lot="',u,'";')
#qry<-dbSendQuery(conn,qry_str)
#qry_res<-dbFetch(qry)
#dbDisconnect(conn)
#qry_res$Lot<-u
#qry_res
#}
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