Avoids the AR default timestamp records.

chronno_trigger_ftw.rb

# how to use(and abuse) it:
# chronno_trigger_ftw! { my_model_instance.update_attributes(:updated_at => my_custom_date) }

def chronno_trigger_ftw!(&block)
  Customer.record_timestamps = false
  yield
  Customer.record_timestamps = true
end

# a threadsafe with ensure block:

  def skipping_timestamps &block
    begin
      class << self
        def record_timestamps; false; end
      end
      yield
    ensure
      class << self
        remove_method :record_timestamps
      end
    end
  end