firefly-iii/app/Http/Controllers/System/HealthcheckController.php

<?php

/*
 * HealthcheckController.php
 * Copyright (c) 2021 https://github.com/ajgon
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
declare(strict_types=1);

namespace FireflyIII\Http\Controllers\System;

use FireflyIII\Http\Controllers\Controller;
use FireflyIII\User;
use Illuminate\Http\Response;

/**
 * Class HealthcheckController.
 */
class HealthcheckController extends Controller
{
    /**
     * Sends 'OK' info when app is alive
     */
    public function check(): Response
    {
        User::count(); // sanity check for database health. Will crash if not OK.

        return response('OK', 200);
    }
}