Per-model schemas

class Product extends Model implements HasAttributesContract
{
    use HasAttributes;

    /** @var array<string, array<string, mixed>> */
    protected array $attributeDefinitions = [
        'rating'  => ['type' => 'integer', 'rules' => ['min:1', 'max:5'], 'required' => true],
        'sku'     => ['type' => 'string', 'unique' => 'global'],
        'token'   => ['type' => 'string', 'encrypted' => true],
        'retries' => ['type' => 'integer', 'default' => 3],
    ];
}

class Ticket extends Model implements HasAttributesContract
{
    use HasAttributes;

    /**
     * @return array<string, array<string, mixed>>
     */
    public function attributeDefinitions(): array
    {
        return [
            'priority'     => ['type' => 'integer', 'rules' => ['min:1', 'max:4'], 'required' => true],
            'escalated_at' => ['type' => 'datetime'],
            'channel'      => ['type' => 'string', 'default' => 'email'],
        ];
    }
}

Attributes::define(new AttributeDefinitionData('retries', AttributeType::Integer, default: 99));

$product->attributeInt('retries'); // 3  — Product declares its own default
$order->attributeInt('retries');   // 99 — Order falls back to the global definition

Attributes::definitionsFor($product); // global definitions overlaid by Product's own