> Why not store the events on some BTree or similar structure with a 
> simple unique integer id, and use a separate BTree to map dates to these 
> events? You can even use zc.catalog or similar tools to create that 
> mapping - you would get a lot of query options for free with those as well.
Yeah, that would require a lot of changes, but it would be definitely 
great. What does zc.catalog have that zope.catalog doesn't, by the way?

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