migration.rb

class DropProperties < ActiveRecord::Migration
  class ChangeHistory < ActiveRecord::Base
    # copied from real ChangeHistory model
    scope :for_target, ->(target) { where(target_type: target.class.base_class.to_s, target_id: target.id) }
  end

  def change
    drop_table :properties
    ChangeHistory.for_target('Property').destroy
  end
end