Currently Empathy generates lowl level client side API to clear logs (all the logs and for one specific account). It would be done to have high level API (GIO style) in liblogger so Empathy wouldn't have to do so.
Got a branch for that, totally untested though, I just rebase it blindly against master: http://cgit.collabora.com/git/user/nicolas/telepathy-logger.git/log/?h=gdbus-bindings
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