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create table tbl_name (
    product_id      int,
    model_number    int,
    description     char[]
);

create table new_tbl_name (
    product_id      int,
    model_number    int,
    description     text
);

my $text = join('', <STDIN>);
my $pg_array = 
...
    insert into tbl_name (product_id, model_number, description)
    values ($prod_id, $mod_num, $pg_array)
");