exchange/database/migrations/2020_08_24_181820_create_invoice_status.php

<?php

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

class CreateInvoiceStatus extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('invoice_statuses', function (Blueprint $table) {
            $table->increments('id');
            $table->string('status', 20);
            $table->string('comment');
            $table->timestamps();
            $table->integer('invoice_id')->unsigned();
            $table->foreign('invoice_id')
                    ->references('id')
                    ->on('invoices')
                    ->onDelete('cascade');
        });
    }

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