my $ret = add_names query(problem_entry_sth => $id)->hash;
my $limits = query(limits_sth => $id)->hashes;
$ret->{limits} = $limits if @$limits;
my $ret = add_names query(problem_entry_sth => $id)->hash;
my $limits = query(limits_sth => $id)->hashes;
$ret->{limits} = $limits if @$limits;