Caramel-CRM/app/Console/Kernel.php

<?php

namespace App\Console;

use Illuminate\Console\Scheduling\Schedule;
use Illuminate\Foundation\Console\Kernel as ConsoleKernel;

class Kernel extends ConsoleKernel
{
    /**
     * Register the Artisan commands for the application.
     *
     * @var array
     */
    protected $commands = [
        \App\Console\Commands\CaldavSyncCommand::class,
        \App\Console\Commands\CheckInvoiceDueDatesCommand::class,
    ];

    /**
     * Define the application's command schedule.
     */
    protected function schedule(Schedule $schedule): void
    {
        $schedule->command('caldav:sync')
            ->everyMinute()
            ->withoutOverlapping();

        // Run synchronously on schedule to support environments without queue workers
        $schedule->command('invoices:check-due')
            ->dailyAt('3:00')
            ->withoutOverlapping();
    }

    /**
     * Register the commands for the application.
     */
    protected function commands(): void
    {
        $this->load(__DIR__ . '/Commands');

        require base_path('routes/console.php');
    }
}