liwo/database/migrations/2021_09_03_085114_create_costs_table.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateCostsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('costs', function (Blueprint $table) {
            $table->id();
            $table->unsignedBigInteger('business_id');
            $table->string('type');
            $table->date('month');
            $table->unsignedInteger('amount');
            $table->unsignedInteger('fee')->default(0);
            $table->unsignedInteger('duration');
            $table->unsignedInteger('cost')->storedAs('fee*duration');
            $table->unsignedFloat('tax', 8, 2)->storedAs('(cost/100)*9');
            $table->json('additional')->nullable();
            $table->timestamp('created_at')->nullable();
            $table->timestamp('updated_at')->useCurrent();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('costs');
    }
}