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It's funny, I've never heard that term but looking it up, I find some connections to some things I'm working on (that are not bitemporal databases).

What are some good resources?

A spreadsheet is a bitemporal database of sorts right?

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I don't see how a spreadsheet is either bitemporal or a database. But you could do some simple bitemporal modeling in a spreadsheet. I would imagine querying to be extremely limited and cumbersome though.

A spreadsheet (with undo) is pretty much exactly a bitemporal database but it only shows you the "latest" version. You can undo to go back in time but it is not very convenient. THere are also DAGs and the code is data. Building this at scale is what a lot of large orgs end up trying to do. Tricky bit is probably the trade of between lazy eval (pull?) and streaming push through the calcs. I think push is needed for low latency but am not 100%.

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