This is basically nerdy debug info, but as I mentioned on IRC, it could also be useful as an interim #99 .
My thinking is that we could decode and store reactions in a format maybe like @ MSGID REACTION which would be human readable as a reaction when you see the MSGIDs referred to, and machine-readable when the database is aware of reactions and a data migration can be made.
This also allows us to postpone (likely to be very annoying) QML work into the future.
A wishlist item would be log-parsing to retroactively store these reactions into the database already now. It seems the log contains almost everything, although the target message id seems to be needed to looked up by timestamp.