panel/database/migrations/2016_09_07_163017_add_unique_identifier.php

<?php

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

class AddUniqueIdentifier extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('services', function (Blueprint $table) {
            $table->char('author', 36)->after('id');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('services', function (Blueprint $table) {
            $table->dropColumn('author');
        });
    }
}