msgmap: note how we use ->created_at

[public-inbox.git] / lib / PublicInbox / Msgmap.pm

diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index 5b4cebc105bd21c659b1182721323cbf881d381a..f15875e37cd8a88c2b74956301892d4198be541f 100644 (file)
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -6,9 +6,10 @@
 # numbers for NNTP and allows prefix lookups for partial Message-IDs
 # in case URLs get truncated from copy-n-paste errors by users.
 #
-# This is maintained by ::SearchIdx
+# This is maintained by ::SearchIdx (v1) and ::V2Writable (v2)
 package PublicInbox::Msgmap;
 use strict;
+use v5.10.1;
 use DBI;
 use DBD::SQLite;
 use PublicInbox::Over;
@@ -31,9 +32,6 @@ sub new_file {
        my $self = bless { filename => $f }, $class;
        my $dbh = $self->{dbh} = PublicInbox::Over::dbh_new($self, $rw);
        if ($rw) {
-               # TRUNCATE reduces I/O compared to the default (DELETE)
-               $dbh->do('PRAGMA journal_mode = TRUNCATE');
-
                $dbh->begin_work;
                create_tables($dbh);
                $self->created_at(time) unless $self->created_at;
@@ -93,6 +91,7 @@ sub last_commit_xap {
        $self->meta_accessor("last_xap$version-$i", $commit);
 }
 
+# this is the UIDVALIDITY for IMAP (cf. RFC 3501 sec 2.3.1.1. item 3)
 sub created_at {
        my ($self, $second) = @_;
        $self->meta_accessor('created_at', $second);