keep a list of read and unread items

hi guys
i m building an rss reader and i want you suggestions for datastructure
for keeping read and unread list for each use
i m assuming it will be very sparse

i m sure the users need to maintain their own data,
but as a provider we need to store their information
right, sessions and cookies work only during their
stay in the site, after they exit, im sure they would
like to come back to the same info, wont u

so i was wondering what is the best way to maintain
the list of read/unread items in a python
datastructure,


 there is a blog
 and it associated feed entries
 the blog posts
 when someone clicks it i need to maintain read
status for it
 and when it is unclicked i need the unread status
 this needs to be maintianed for a huge number of
 usrs

thanks


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