True/False fields have a great simplicity about them, and many times they're perfect for the job! But, it's not uncommon end up in a place where you'd really love to keep some degree of simplicity with a little more detail about when the value was changed. Sometimes you'll want to display that information to the user and other times you'll keep it for auditing or debugging purposes. Either way, boolean_timestamp makes the job easy from the beginning and adds very little code to your app.