lei up: automatically use dt: for remote externals

Since we can't use maxuid for remote externals, automatically
maintaining the last time we got results and appending a dt:
range to the query will prevent HTTP(S) responses from getting
too big.

We could be using "rt:", but no stable release of public-inbox
supports it, yet, so we'll use dt:, instead.

By default, there's a two day fudge factor to account for MTA
downtime and delays; which is hopefully enough.  The fudge
factor may be changed per-invocation with the
--remote-fudge-factor=INTERVAL option

Since different externals can have different message transport
routes, "lastresult" entries are stored on a per-external basis.

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/PublicInbox/LeiToMail.pm b/lib/PublicInbox/LeiToMail.pm
index d3253d9b..9f7171fb 100644
--- a/lib/PublicInbox/LeiToMail.pm
+++ b/lib/PublicInbox/LeiToMail.pm
@@ -437,7 +437,9 @@ sub new {
                         ($lei->{opt}->{save} ? 'LeiSavedSearch' : 'LeiDedupe');
                 eval "require $dd_cls";
                 die "$dd_cls: $@" if $@;
-                $dd_cls->new($lei);
+                my $dd = $dd_cls->new($lei);
+                $lei->{lss} //= $dd if $dd && $dd->can('cfg_set');
+                $dd;
         };
         $self;
 }