Remove rails_admin_histories table

* Move enable/disable notification icon [#7592](https://github.com/diaspora/diaspora/pull/7592)

* Use Bootstrap 3 progress-bar for polls [#7600](https://github.com/diaspora/diaspora/pull/7600)

* Enable frozen string literals [#7595](https://github.com/diaspora/diaspora/pull/7595)

* Remove `rails_admin_histories` table [#7597](https://github.com/diaspora/diaspora/pull/7597)

## Bug fixes

* Fix displaying polls with long answers [#7579](https://github.com/diaspora/diaspora/pull/7579)

# frozen_string_literal: true

class RemoveRailsAdminHistories < ActiveRecord::Migration[5.1]

  def up

    drop_table :rails_admin_histories

  end

  def down

    create_table :rails_admin_histories do |t|

      t.text     :message

      t.string   :username

      t.integer  :item

      t.string   :table

      t.integer  :month,      limit: 2

      t.integer  :year,       limit: 8

      t.datetime :created_at,           null: false

      t.datetime :updated_at,           null: false

    end

    add_index :rails_admin_histories, %i[item table month year], name:   :index_rails_admin_histories,

                                                                 length: {table: 188}

  end

end