=head1 TERMS
+=over 8
+
=item IMAP UID, NNTP article number, on-disk Xapian docid
A sequentially-assigned positive integer. These integers are per-inbox,
part of the PSGI code and not need a separate daemon like
L<public-inbox-nntpd(1)> or L<public-inbox-imapd(1)>
+=item epoch
+
+A git repository used for blob storage. See
+L<public-inbox-v2-format(5)/GIT EPOCHS>.
+
=item keywords, (IMAP|Maildir) flags, mbox Status + X-Status
Private, per-message keywords or flags as described in RFC 8621
used, and then the current time if neither header exists.
When mirroring via git, this is the git author time.
+=back
+
=head1 COPYRIGHT
Copyright 2021 all contributors L<mailto:meta@public-inbox.org>