$self->{unique_counter}++;
$value = { expiration => $params{expiration} ? ($now[0] + $params{expiration}) * 1000000 + $now[1] : undef,
$self->{unique_counter}++;
$value = { expiration => $params{expiration} ? ($now[0] + $params{expiration}) * 1000000 + $now[1] : undef,