atcheck/database/migrations/2019_11_26_232945_create_rooms_table.php

<?php

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

class CreateRoomsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('rooms', function (Blueprint $table) {
            $table->bigIncrements('id')->unique();
            $table->string('name')->unique();
            $table->integer('capacity')->nullable();
            $table->string('arrangement')->nullable();
            $table->timestamps();
        });
    }

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