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use Time::HiRes qw/ gettimeofday /;

...

    $self->write( $data );
}

mysql> select id, pid, action, from_unixtime(time) from queue_logger o
+rder by id;
+-------+-------+----------+----------------------------+
...
| 83642 | 15218 | sleep    | 2016-05-06 12:38:49.251690 | <- timestamp
+ed first, but inserted second!
| 83683 | 15218 | complete | 2016-05-06 12:39:19.707134 |
+-------+-------+----------+----------------------------+