add user_id index in the build_lists table

db/migrate/20150529034800_add_user_id_index_to_build_lists.rb

@@ -0,0 +1,5 @@
+class AddUserIdIndexToBuildLists < ActiveRecord::Migration
+  def change
+    add_index :build_lists, :user_id
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150519032855) do
+ActiveRecord::Schema.define(version: 20150529034800) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -156,6 +156,7 @@ ActiveRecord::Schema.define(version: 20150519032855) do
     t.index ["project_id", "save_to_repository_id", "build_for_platform_id", "arch_id"], :name => "maintainer_search_index"
     t.index ["project_id"], :name => "index_build_lists_on_project_id"
     t.index ["updated_at"], :name => "index_build_lists_on_updated_at", :order => {"updated_at" => :desc}
+    t.index ["user_id"], :name => "index_build_lists_on_user_id"
   end
 
   create_table "projects", force: true do |t|