jiqu-library-server/app/Models/AgentUpgradeLog.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class AgentUpgradeLog extends Model
{
    /**
     * @var array
     */
    protected $fillable = [
        'user_id',
        'before_agent_level',
        'change_agent_level',
    ];
}