try:
    instance, partner_company_id, partner_id = request.env['wizard.create.instance'].create_instance(kwargs)
except Exception as e:
    return {
        'error': str(e)
    }

on the model i have an @api.constraints that raise an error but this is ingnored if the function it's inside a try except and it's created anyway. How rollback in case of raised Error?