jonnybarnes.uk/app/Models/Passkey.php

<?php

declare(strict_types=1);

namespace App\Models;

use Illuminate\Database\Eloquent\Attributes\Fillable;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

#[Fillable(['passkey_id', 'passkey'])]
class Passkey extends Model
{
    use HasFactory;

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }
}