$sql_stmt = qq~
		delete from session
		where (((to_days(now()) * $day_minute) + (hour(now()) * $hour_minute) + minute(now())) -
		((to_days(last_req) * $day_minute) + (hour(last_req) * $hour_minute) + minute(last_req))) > $session_limit~;
		$sth = $dbh->prepare($sql_stmt);
		$sth->execute() or &error("1SQL&Couldn't execute statement: $DBI::errstr");

		$sth->finish();