use Modern::Perl; return { bug_number => "28854", description => "Add new 'item_issue' unique index to return claims", up => sub { my ($args) = @_; my ($dbh, $out) = @$args{qw(dbh out)}; if ( !unique_key_exists('return_claims', 'item_issue') ) { $dbh->do(q{ ALTER TABLE return_claims ADD UNIQUE KEY item_issue (`itemnumber`,`issue_id`) }); } }, };