Add WebSub migration

database/migrations/2018_04_22_233721_create_web_subs_table.php

@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateWebSubsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('web_subs', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->bigInteger('follower_id')->unsigned()->index();
+            $table->bigInteger('following_id')->unsigned()->index();
+            $table->string('profile_url')->index();
+            $table->timestamp('approved_at')->nullable();
+            $table->unique(['follower_id', 'following_id', 'profile_url']);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('web_subs');
+    }
+}