annotate models (#2697)

* add annotate to Gemfile

* rails g annotate:install

* configure annotate_models

* add schema info to models

* fix rubocop to add frozen_string_literal

app/models/import.rb

@@ -1,4 +1,19 @@
 # frozen_string_literal: true
+# == Schema Information
+#
+# Table name: imports
+#
+#  id                :integer          not null, primary key
+#  account_id        :integer          not null
+#  type              :integer          not null
+#  approved          :boolean
+#  created_at        :datetime         not null
+#  updated_at        :datetime         not null
+#  data_file_name    :string
+#  data_content_type :string
+#  data_file_size    :integer
+#  data_updated_at   :datetime
+#
 
 class Import < ApplicationRecord
   FILE_TYPES = ['text/plain', 'text/csv'].freeze