New-OMIS/Modules/Admin/app/Models/Cities.php

<?php

namespace Modules\Admin\Models;

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

class Cities extends Model
{
    use HasFactory;

    protected $table = 'tbl_cities';
    protected $primaryKey = 'city_id';

    protected $guarded = [];
}