sam-api/app/Models/UserTenant.php

<?php

namespace App\Models;

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

class UserTenant extends Model
{
    use SoftDeletes, ModelTrait, BelongsToTenant;

    protected $fillable = [
        'user_id', 'tenant_id', 'is_active', 'joined_at', 'left_at'
    ];

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

    public function tenant()
    {
        return $this->belongsTo(Tenant::class);
    }
}