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While this isn't specifically for FoundationDB, I wrote this post many years ago about how to implement (secondary) indexes on top of a key-value store. [0]

https://misfra.me/2017/01/18/how-to-implement-secondary-inde...

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Interesting that you choose to do it manually. Do you do this as a transaction so that the indexes are always updated. If not, how do you handle partial failures?

Of course you update indexes in a transaction. Doing this manually has a lot of advantages, some of which I outlined in my other comments in this thread.

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