IMPORTANT: due to a drive failure, as of 13-Mar-2021, the Mercurial repository had to be re-mirrored, which changed every commit SHA. The old SHAs and trees are backed up in the vault branches. Please migrate to the new branches as soon as you can.
Clients may want to show a list of conversations ordered by how
timestamp of most recent message.
The counts allow a badge with unread message counter.