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my @loop_data=();
$loop_data=[
...
    {Auction=>'Test4', ID=>'4'},
];
$template->param(table1 => \@loop_data);

my @loop_data=();
my %rowdat;
...
$rowdat{ID}='1';
push(@loop_data, \%rowdat);
$template->param(table1 => \@loop_data);