+sub _db_update_last ($$) {
+ # revokes $h if it's valid; no-op if it's not
+ my ($r,$user,$h) = @_;
+ my $dbh = $r->{Dbh};
+ $dbh->do("UPDATE $r->{S}{db_prefix}_assocs".
+ " SET last = ?".
+ " WHERE username = ? AND assochash = ?", {},
+ time, $user, $h);
+}
+