public-inbox-index creates and updates the search, overview and
NNTP article number database used by the read-only public-inbox
HTTP and NNTP interfaces. Currently, this requires
-L<DBD::SQlite> and L<DBI> Perl modules. L<Search::Xapian>
+L<DBD::SQLite> and L<DBI> Perl modules. L<Search::Xapian>
is optional, only to support the PSGI search interface.
Once the initial indices are created by public-inbox-index,
This does not touch the NNTP article number database.
+=item --prune
+
+Run L<git-gc(1)> to prune and expire reflogs if discontiguous history
+is detected. This is intended to be used in mirrors after running
+L<public-inbox-edit(1)> or L<public-inbox-purge(1)> to ensure data
+is expunged from mirrors.
+
=back
=head1 FILES
v2 repositories are described in L<public-inbox-v2-format>.
-=back
-
=head1 ENVIRONMENT
=over 8