Using ActiveRecord's #signed_id and .find_signed methods you can create URLs that expire Show archive.org snapshot after some time. No conditionals or additional database columns required.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

Prevents you from data breaches and liability risks
Upgrade at your own pace
Works with modern Rubies

Signed URLs with Ruby on Rails

Rails Long Term Support