UserConfig.php

<?php
/**
 * Application for managing user configuration
 *
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Backend\App;

use Magento\Config\Model\Config\Factory;
use Magento\Framework\App\Bootstrap;
use Magento\Framework\App\Console\Response;
use Magento\Framework\AppInterface;

/**
 * @api
 * @since 100.0.2
 */
class UserConfig implements AppInterface
{
    /**
     * Console response
     *
     * @var Response
     */
    private $response;

    /**
     * Requested changes
     *
     * @var array
     */
    private $request;

    /**
     * Factory for config models
     *
     * @var Factory
     */
    private $configFactory;

    /**
     * Constructor
     *
     * @param Factory $configFactory
     * @param Response $response
     * @param array $request
     */
    public function __construct(
        Factory $configFactory,
        Response $response,
        array $request
    ) {
        $this->response = $response;
        $this->request = $request;
        $this->configFactory = $configFactory;
    }

    /**
     * Run application
     *
     * @return \Magento\Framework\App\ResponseInterface
     */
    public function launch()
    {
        $this->response->terminateOnSend(false);
        $this->updateUserConfigData();
        return $this->response;
    }

    /**
     * Inserts provided user configuration data into database
     *
     * @return void
     */
    private function updateUserConfigData()
    {
        foreach ($this->request as $key => $val) {
            $configModel = $this->configFactory->create();
            $configModel->setDataByPath($key, $val);
            $configModel->save();
        }
    }

    /**
     * {@inheritdoc}
     */
    public function catchException(Bootstrap $bootstrap, \Exception $exception)
    {
        return false;
    }
}