WordPress MU

Greetings fellow wpmu-ers,

It appears the RSS feeds have been moved out of the wp_XXX_options table. I think they moved to wp_sitemeta table. Can anyone confirm?

Also, I've noticed that in some cases those rows can get pretty large. If I do this query, I get some rows back where CHAR_LENGTH(meta_value) returns > 100,000 and some where CHAR_LENGTH(meta_value) > 1,000,000 (commas added for readability):

select CHAR_LENGTH(meta_value), meta_id,meta_key
  from wpmu.wp_sitemeta
  order by CHAR_LENGTH(meta_value) desc;

Can these rows be safely removed, like the rss_ rows of yore in wp_XXX_options?