Add quality control rake tasks
user
```ruby
namespace :qc do
  desc "Remove duplicate readings for a given user"
  task dedupe: :environment do
    user = User.find_by email: ENV['EMAIL']
    throw 'no user with that email found' if !user
    readings = user.readings
    dupes = []

    (0...readings.length).times do |i|
      reading1 = readings[i]
      reading2 = readings[i + 1]
      time1 = reading1.created_at.strftime('%Y-%m-%dT%H')
      time2 = reading2.created_at.strftime('%Y-%m-%dT%H')
      temp1 = reading1.outdoor_temp
      temp2 = reading2.outdoor_temp
      dupes << reading1 if time1 == time2 && temp1 == temp2
    end

    dupes.each_with_index do |d, i|
      puts "#{i}. #{d.created_at.strftime('%Y-%m-%dT%H')} #{d.outdoor_temp}"
    end
  end

  namespace :outdoor do
    desc "Update outdoor temperature readings for a given user"
    task update: :environment do
      user = User.find_by email: ENV['EMAIL']
      throw 'no user with that email found' if !user
      readings = user.readings
      readings.each do |r|
        updated_temp = WeatherMan.outdoor_temp_for(r.created_at)
        if outdoor_temp.is_a? Integer
          r.outdoor_temp = updated_temp
          r.save
        else
          throw 'API not returning valid data'
        end
      end
    end
  end

  namespace :truncate do
    desc ""
    task until: :environment do
      user = User.find_by email: ENV['EMAIL']
      throw 'no user with that email found' if !user
      time = Time.parse(ENV['TIME'])
      user.readings.each_with_index do |r, i|
        # TODO: remove puts
        puts i
        if r.created_at < time
          # TODO: change to r.destroy
          puts r.created_at
        end
      end
    end
  end
end
```
assistant