Index: 20170607051650_add_index_on_enabled_modules_name.rb
===================================================================
--- 20170607051650_add_index_on_enabled_modules_name.rb	(nonexistent)
+++ 20170607051650_add_index_on_enabled_modules_name.rb	(working copy)
@@ -0,0 +1,5 @@
+class AddIndexOnEnabledModulesName < ActiveRecord::Migration
+  def change
+    add_index :enabled_modules, :name
+  end
+end