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[% IF msg == 'success' %]
    <p>You were successful.</p>
...
    [% msg IF msg %]
    ... show the form because something went wrong ...
[% END %]

$self->run_modes(
    'default'    => 'default',\
...
    'modify_record'    => 'database_action',    
    'other_run_mode'    => 'other_sub',
);

sub database_action
{
...
    
    return $output;
}

sub do_some_database_action
{
...
    $result = 'success' if (!$result);
    return $result;
}