Hi David, Thank you for your detailed post.

It is for a forum application. A topic may have up to 20.000 posts, set to 
10 for each page. You can browse through the posts with the next and prev 
page buttons but we also need a jump to page n field.

For now, we store all keys in the topic entity. It is a blob with a 
serialized array with some magic to reduce the size. The forum entity does 
the same for all topics.

We also have a ranking system to the list the active users. It is the 
entire ranking table divided in blocks of 50.000 users per entity @ 0.7MB. 
The table doesn't include users with a score of 0 posts. Didn't thought of 
the B-tree approach, will have second thought about it.


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