Remove index from application_settings uuid column

db/migrate/20170328010804_add_uuid_to_application_settings.rb

@@ -7,12 +7,10 @@ class AddUuidToApplicationSettings < ActiveRecord::Migration
 
   def up
     add_column :application_settings, :uuid, :string
-    add_concurrent_index :application_settings, :uuid
     execute("UPDATE application_settings SET uuid = #{quote(SecureRandom.uuid)}")
   end
 
   def down
-    remove_index :application_settings, :uuid if index_exists?(:application_settings, :uuid)
     remove_column :application_settings, :uuid
   end
 end

db/schema.rb

@@ -132,8 +132,6 @@ ActiveRecord::Schema.define(version: 20170328010804) do
     t.string "uuid"
   end
 
-  add_index "application_settings", ["uuid"], name: "index_application_settings_on_uuid", using: :btree
-
   create_table "approvals", force: :cascade do |t|
     t.integer "merge_request_id", null: false
     t.integer "user_id", null: false