I want to be able to record somewhere in a failed goal the postmortem, in order to case-study my failures. Currently one cannot edit the fine print once derailment has occurred. However, fine print seems like a great place to write a postmortem as a reminder to oneself of "why did I fail these goals", and stop running in circles.

Postmortems can include: I started too high, or I just hate this task and I might well decide to just quit this goal permanently, or perhaps I was quantifying the wrong variable.