speed up maintainer queries

db/migrate/20150601043133_add_order_index_to_build_list_packages.rb

@@ -0,0 +1,10 @@
+class AddOrderIndexToBuildListPackages < ActiveRecord::Migration
+  def up
+    add_index :build_list_packages, name: :build_list_packages_ordering,
+              expression: "lower(build_list_packages.name) ASC, length(build_list_packages.name) ASC"
+  end
+
+  def down
+    remove_index :build_list_packages, name: :build_list_packages_ordering, if_exists: true
+  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: 20150529034800) do
+ActiveRecord::Schema.define(version: 20150601043133) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -102,6 +102,7 @@ ActiveRecord::Schema.define(version: 20150529034800) do
     t.string   "sha1"
     t.integer  "epoch"
     t.text     "dependent_packages"
+    t.index :name => "build_list_packages_ordering", :expression => "lower((name)::text), length((name)::text)"
     t.index ["actual", "platform_id"], :name => "index_build_list_packages_on_actual_and_platform_id"
     t.index ["build_list_id"], :name => "index_build_list_packages_on_build_list_id"
     t.index ["name", "project_id"], :name => "index_build_list_packages_on_name_and_project_id"