db.save()

    @transaction.atomic()
    def save(self, device, full=True):
        manufacturer_id = self._get_manufacturer_id(device.manufacturer)
        device_type_id = self._get_device_type_id(device.model, manufacturer_id)

        key = dict(
            site_id=AVITO_SITE_ID,
            device_type_id=device_type_id,
            device_role_id=self._get_device_role_id('server'),
        )
        defaults = dict(
            name=device.host,
            serial=device.serial,
            processor_count=device.processor_count,
            mem_size_gb=device.mem_size_gb,
        )

        if (device.host in self.device_name_set) and (device.serial not in self.device_serial_set):
            key['name'] = device.host
        else:
            key['serial'] = device.serial

        try:
            db_device = Device.objects.get(**key)

            need_update = False
            for db_name, item_value in defaults.items():
                attr = getattr(db_device, db_name)
                if attr != item_value:
                    setattr(db_device, db_name, item_value)
                    need_update = True
            if need_update:
                db_device.save()

        except Device.DoesNotExist:
            key.update(defaults)
            db_device = Device.objects.create(**key)

        if full:
            self.save_interfaces(db_device, device)  # XXX not id
            self.save_hardware(db_device.id, device)
        self.save_containers(db_device.id, device.containers)
        self.save_firmware(db_device.id, device.firmware)
        self.save_tags(db_device, device.tags)