Automatically clean our twilo account

We use twilio extensively and frequently add new phone numbers to the system. The problem is, we never go back and delete phone numbers once we've finished with them and so we keep paying for them forever. This project is to build an application that will periodically email us a list of twilio phone numbers that have not had any activity in the last 30 days and provide a simple way to delete the phone number from twilio. The email should look something like; /start email Phone Number Last Call Url 800-123-4567 2015-03-01 [login to view URL] http://[ link to delete this number ]/ 800-123-4568 2015-03-01 [login to view URL] http://[ link to delete it ] 800-123-4569 2015-03-01 [login to view URL] http://[ link to delete it ] 310-400-1234 2015-03-01 [login to view URL] http://[ link to delete it ] 800-123-4567 2015-03-01 [login to view URL] http://[ link to delete it ] /end Other info/requirements: Must run on one of our standard tech stacks; Heroku + Ruby on Rails, or Heroku + Node.js (your choice) We have approximately 1200 phone numbers and ~200,000 calls per month across 2 twilio accounts, so you will need to support multiple twilio accounts and make sure the solution completes in a reasonable time with a large number of calls. Desired SkillsRuby on Rails, Twilio API, Node.js