sam-api/app/Models/Commons/CategoryLog.php

<?php

namespace App\Models\Commons;

use App\Traits\BelongsToTenant;
use App\Traits\ModelTrait;
use Illuminate\Database\Eloquent\Model;

class CategoryLog extends Model
{
    use BelongsToTenant, ModelTrait;

    protected $table = 'category_logs';

    public $timestamps = false; // changed_at 컬럼 단일 사용

    protected $fillable = [
        'category_id', 'tenant_id', 'action', 'changed_by', 'changed_at',
        'before_json', 'after_json', 'remarks',
    ];

    protected $casts = [
        'changed_at' => 'datetime',
        'before_json' => 'array',
        'after_json' => 'array',
    ];

    public function category()
    {
        return $this->belongsTo(Category::class);
    }
}