After a couple of days of knocking my head against a wall, we have managed to complete work on a new CDB features, Events. See +HELP CDB EVENTS for more information. This will allow players to add a short text describing something of note that happened to their character on the selected day. This note can be private or public. This should help players keep a track of RP events, and help future players of those characters get up to speed on things that have happened to their character.
The system is not really envisioned as an everyday sort of thing, and is primarily intended for use to record noteworthy events (for the character, not necessarily for the greater public) rather than to catalogue every single RP session that a player partakes in.