[Balladeer]

This "suddenly requirements change" is why I get instantly wary whenever I see a boolean column like `completed` in a design.

Sure, you start with two explicit states. But then you add `deleted` and now you have four states, whether you know it or not. Then there's talk of adding a third boolean column, and folks are wondering what it _means_ to be "deleted" but not "completed" and whether that is a valid state, and pretty soon the team is reinventing the concept of a state machine without any of the vocabulary that makes it straightforward.