title: Update Table if source modified
body: <p>I know the title is not self-explaining but I don't know how to express this.
  There is a site which keeps updating a small database opensource in many different formats, and I have a table in my DB that I want to be "linked" to that DB, so that if the DB gets updated the table gets cleared and repopulated with new data.
  I am working with Rails and MySql as Database I don't know if this is possible, but any help would be appreciated, even a hint on what to google...
  Thanks!</p>