One thing I've noticed about Tangram is its shockingly inaccurate documentation and poor error messages when you pass an unexpected object type to a function. But when you do call it with the correct syntax it seems to work well :).

Once you have a schema, you need to deploy it with a back end. So if you're deploying to a generic relational database:

#!/usr/bin/perl

use strict;
use Tangram;
use Tangram::Relational;

my ($schema) = Tangram::Schema->new(
    'classes'   =>  {
        'item'  =>  {
            'table'     =>  'test',
            'abstract'  =>  1,
            'fields'    =>  {
                'string'    =>  [ qw(
                    category
                    description_short
                    description_long
                    description_table
                    image_1
                    image_2
                    supplier_id
                    barcode_id
                ) ],
                'int'       =>  [ qw(
                    manufacturer
                    supplier
                ) ]
            }
        }
    }
);

Tangram::Relational->deploy($schema);
[download]

s/Relational/mysql/ if you're using MySQL.