misc_pterodactyl-panel/app/Http/Requests/Api/Application/Databases/GetDatabaseRequest.php

<?php

namespace Pterodactyl\Http\Requests\Api\Application\Databases;

use Pterodactyl\Models\DatabaseHost;

class GetDatabaseRequest extends GetDatabasesRequest
{
    /**
     * Determine if the requested database exists on the Panel.
     *
     * @return bool
     */
    public function resourceExists(): bool
    {
        $databaseHost = $this->route()->parameter('databaseHost');

        return $databaseHost instanceof DatabaseHost && $databaseHost->exists;
    }
}