$table->text('excerpt')->nullable()->comment('Quick summary for product. This will appear on the product page under the product name and for SEO purpose.');
$table->string('sku')->nullable()->unique()->comment('SKU refers to a Stock-keeping unit, a unique identifier for each distinct product and service that can be purchased.');
$table->boolean('virtual')->nullable()->default(false)->index()->comment('If this product is a non-physical item, for example a service, which does not need shipping.');
$table->boolean('downloadable')->nullable()->default(false)->index()->comment('If purchasing this product gives a customer access to a downloadable file, e.g. software');