$DB->insert_record(
   table => 'mytable',
   data  => $form,
);

# But if you want timestamp => NOW() it should not be used as 
# placeholder so I added another parameter marking which fields 
# should be included as they are ... Of course this particular 
# example would better been done by setting default value of 
# timestamp field to NOW() and sending nothing here....

$form->{timestamp} ||= 'NOW()';

$DB->insert_record(
   table => 'mytable',
   data  => $form,
   as_is_fields => $form->{timestamp} eq 'NOW()' ? [qw/timestamp/] : [],
);