Build a compatibility table for an expand-and-contract database change and identify the point after which an old application version can no longer run safely.
15 MIN · PLUS
A definition earns nothing in the room. What is worth holding is the shape underneath it: what this mechanism buys, what it charges you for that, and the one condition that decides whether it applies here at all.
Then follow one real example the whole way through and say how it fails, because naming the failure is what separates having operated this from having read about it.
