The problem is that you're using qw in the list that you're passing to add_columns. What you're actually passing is the list ( 'id', 'token', 'old_invoice', 'date', '=>', '{data_type', '=>', \'datetime\'}' )
In order to pass a list of column-name => hashref pairs, you'll need to write it like this:
__PACKAGE__->add_columns(id => { },
token => { },
old_invoice => { },
date => {data_type => 'datetime'}
);
Alternatively, you can pass a list of the plain column names (no hashrefs) and specify the date column type later:
__PACKAGE__->add_columns(qw/id
token
old_invoice/);
__PACKAGE__->add_columns(date => {data_type => 'datetime'});
Update: Fixed typos
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