search: rename "ts:" prefix to "rt:"

Meaning "Received time", as it is the best description of the
value we use from the "Received:" header, if present.  JMAP
calls it "receivedAt", but "rt:" seems like a better
abbreviation being in line with "dt:" for the "Date" header.

"Timestamp" ("ts") was potentially ambiguous given the presence
of the "Date" header.

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/PublicInbox/IMAPsearchqp.pm b/lib/PublicInbox/IMAPsearchqp.pm
index 78d9a206..2fb92bb8 100644
--- a/lib/PublicInbox/IMAPsearchqp.pm
+++ b/lib/PublicInbox/IMAPsearchqp.pm
@@ -124,7 +124,7 @@ sub ON {
         my ($self, $item) = @_;
         my $ts = yyyymmdd($item);
         my $end = $ts + 86399; # no leap day
-        push @{$self->{xap}}, "ts:$ts..$end";
+        push @{$self->{xap}}, "rt:$ts..$end";
         my $sql = $self->{sql} or return 1;
         $$sql .= " AND ts >= $ts AND ts <= $end";
 }
@@ -132,7 +132,7 @@ sub ON {
 sub BEFORE {
         my ($self, $item) = @_;
         my $ts = yyyymmdd($item);
-        push @{$self->{xap}}, "ts:..$ts";
+        push @{$self->{xap}}, "rt:..$ts";
         my $sql = $self->{sql} or return 1;
         $$sql .= " AND ts <= $ts";
 }
@@ -140,7 +140,7 @@ sub BEFORE {
 sub SINCE {
         my ($self, $item) = @_;
         my $ts = yyyymmdd($item);
-        push @{$self->{xap}}, "ts:$ts..";
+        push @{$self->{xap}}, "rt:$ts..";
         my $sql = $self->{sql} or return 1;
         $$sql .= " AND ts >= $ts";
 }