source: database/migrations/2019_10_25_180617_create_phases_table.php

<?php

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

class CreatePhasesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('phases', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name')->unique();
            $table->unsignedInteger('reviewer_role_id');
            $table->unsignedInteger('user_id');

            $table->foreign("reviewer_role_id")
                ->references("id")
                ->on("roles")
                ->onDelete("cascade");

            $table->foreign("user_id")
                ->references("id")
                ->on("users")
                ->onDelete("cascade");

            $table->timestamps();
        });
    }

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