snipe-it/database/migrations/2017_08_25_074822_add_auditing_tables.php

<?php

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

class AddAuditingTables extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('assets', function (Blueprint $table) {
            $table->date('next_audit_date')->nullable()->default(NULL);
        });
    }

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