Add theme_id column to users table

db/migrate/20170816234252_add_theme_id_to_users.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddThemeIdToUsers < ActiveRecord::Migration
+  DOWNTIME = false
+
+  def change
+    add_column :users, :theme_id, :integer, limit: 2
+  end
+end

db/schema.rb

@@ -1614,6 +1614,7 @@ ActiveRecord::Schema.define(version: 20170905112933) do
     t.boolean "notified_of_own_activity"
     t.string "preferred_language"
     t.string "rss_token"
+    t.integer "theme_id", limit: 2
   end
 
   add_index "users", ["admin"], name: "index_users_on_admin", using: :btree