todo/app/Models/Label.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;

class Label extends Model
{
    use HasFactory;

    protected $fillable = [
        'id',
        'name',
        'project_id',
        'created_by_id',
    ];

    public function tasks(): BelongsToMany
    {
        return $this->belongsToMany(Task::class);
    }
}