create api quota index

database/migrations/2017_12_21_095425_create_api_quota_index.php

@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateApiQuotaIndex extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('links', function (Blueprint $table)
+        {
+            $table->index(
+                ['created_at', 'creator', 'is_api'],
+                'api_quota_index'
+            );
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('links', function (Blueprint $table)
+        {
+            $table->dropIndex('api_quota_index');
+        });
+    }
+}