tissue/database/migrations/2018_06_07_225520_create_metadata_table.php

<?php

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

class CreateMetadataTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('metadata', function (Blueprint $table) {
            $table->string('url');
            $table->string('title');
            $table->string('description');
            $table->string('image');
            $table->timestamps();

            $table->index('url');
        });
    }

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