You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20100324010000_clean_rss_logs.rb
    path of file: ./repos/mushroom-observer/db/migrate
    
    the code of the file until where you have to start completion: # encoding: utf-8
class CleanRssLogs < ActiveRecord::Migration
  def self.up
    cutoff = 1.year.ago

    i = 0
    num = RssLog.count
    old_pct = nil
  
    
  def self.up
    cutoff = 1.year.ago

    i = 0
    num = RssLog.count
    old_pct = nil
    for log in RssLog.all
      i += 1
      pct = 100 * i / num
      if pct != old_pct
        $stdout.print "#{pct}%\r"
        $stdout.flush
      end