update log string, add todo, remove 'json' require
Denver Gingerich
created
Updated a log message to remove TODO as we won't be putting the ID of
the message in the log, for privacy reasons. This also means that we
won't have any need to read JSON anymore, so we can delete that
"require 'json'" line as well.
Added a TODO about handling another return value (of INCR). This
probably isn't a big deal either way, as an INCR returning an error
multiple times will result in duplicate archived_message keys that
will be caught elsewhere, but there is still a small chance it won't
be caught, so it would be good to fix eventually.