slovocast/app/src/Controller/HealthCheck.php

<?php

namespace Slovocast\Controller;

use Slovocast\Controller\Controller;
use React\Mysql\MysqlClient;
use function React\Async\await;
use Psr\Http\Message\ResponseInterface as Response;

class HealthCheck extends Controller
{
    public function __construct(
        protected MysqlClient $db
    ) { }

    public function handle(): Response
    {
        $results = await($this->db->query("SELECT 1"));

        return $this->json([
            'http' => true,
            'database' => (bool) count($results->resultRows);
        ]);
    }
}