Just wanted to leave an update in case anyone else has this problem – you need to clear out the old wp_options entries as well before optimizing:
wp eval '$crons = _get_cron_array(); $updated = array_filter($crons, function($v){return !array_key_exists("lc_twicedaily_refresh_req",$v);}); _set_cron_array($updated);'
Just wanted to add a note that we’re seeing the same issue. Our wp_options tables and site error_log files were growing to 15+ GB. This is a side effect of hammering updates to a 7-10 MB db row.
We downgraded the plugin to 1.9, cleared out the growing error_log then ran OPTIMIZE TABLE wp_options to get things under control.
