The advanced playback module for ZNC makes it possible for IRC clients
to avoid undesired repetitive buffer playback. IRC clients may request
the module to send a partial buffer playback starting from and ending
to a certain point of time. The detailed instructions are available
at https://wiki.znc.in/Playback.
https://github.com/jpnurmi/znc-playback/issues
jpnurmi/znc-playback