[deploy] Remove unused columns from pages (#7127)

app/models/page.rb

@@ -1,9 +1,4 @@
 class Page < ApplicationRecord
-  self.ignored_columns = %w[
-    group
-    group_order_number
-  ]
-
   TEMPLATE_OPTIONS = %w[contained full_within_layout].freeze
 
   validates :title, presence: true

db/migrate/20200407084807_remove_unused_columns_from_pages.rb

@@ -0,0 +1,8 @@
+class RemoveUnusedColumnsFromPages < ActiveRecord::Migration[5.2]
+  def change
+    safety_assured do
+      remove_column :pages, :group, :string
+      remove_column :pages, :group_order_number, :integer
+    end
+  end
+end

db/schema.rb

@@ -745,8 +745,6 @@ ActiveRecord::Schema.define(version: 2020_04_07_091449) do
     t.text "body_markdown"
     t.datetime "created_at", null: false
     t.string "description"
-    t.string "group"
-    t.integer "group_order_number"
     t.boolean "is_top_level_path", default: false
     t.text "processed_html"
     t.string "slug"