cssd-back/app/Console/Commands/AddUUIDToMedia.php

<?php

namespace App\Console\Commands;

use App\Services\Media\Media;
use Illuminate\Console\Command;
use Illuminate\Support\Str;

class AddUUIDToMedia extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'app:add-uuid-to-media';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Command description';

    /**
     * Execute the console command.
     */
    public function handle()
    {
        Media::query()->cursor()->each(
            fn(Media $media) => $media->update(['uuid' => Str::uuid()])
        );
    }
}