Ask HN: Tracking 'bad' decisions

Assume the role of CTO for a start up. One must advise the company on "the Way". Sometimes (many?) a decisision is made that is not in alignment with this path.

There is desire to say/show "I told you so" or perhaps "Your good idea sounds like the one I described four months ago, its about time"

How do you track these decision points that you dont agree with?

Digging through email or chat or code takes a long time.

Any tips for tracking, logging, or some kind of capture?

Is there any real gain?