exchange-2.0/app/Models/CurrencyRate.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\SoftDeletes;

class CurrencyRate extends AbstractModel
{
    use SoftDeletes;

    protected $table = 'currency_rates';

    protected $fillable = ['currency_id', 'selling', 'payment_method_type'];

    /**
     * Get the attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'deleted_at' => 'datetime',
        ];
    }
}