article numbers. Used by L<public-inbox-nntpd(1)> and created
and updated by L<public-inbox-index(1)>.
+Users of the L<PublicInbox::WWW> interface will find it
+useful for attempting recovery from copy-paste truncations of
+URLs containing long Message-IDs.
+
Automatically updated by L<public-inbox-mda(1)>,
L<public-inbox-learn(1)> and L<public-inbox-watch(1)>.
the "overview" DB also exists in the xapian directory for v1
repositories. See L<public-inbox-v2-format(5)/OVERVIEW DB>
+Our use of the L</OVERVIEW DB> requires Xapian document IDs to
+remain stable. Using L<public-inbox-compact(1)> and
+L<public-inbox-xcpdb(1)> wrappers are recommended over tools
+provided by Xapian.
+
+This directory is large, often two to three times the size of
+the objects stored in a packed git repository.
+
=item $GIT_DIR/ssoma.index
This file is no longer used or created by public-inbox, but it is