[xyzzy4747]

Sunscreen could be used: https://docs.sunscreen.tech/fhe/fhe_programs/pir_intro.html

>With private information retrieval (PIR), a user can retrieve an item from a database without revealing to the server which item she's interested in. PIR is useful for both web2 and web3 applications. In web2, for example, PIR can be used to help detect harmful images in end-to-end encrypted messaging. For private cryptocurrencies, PIR can help light clients retrieve relevant transactions.

[bawolff]

PIR is usually about preventing the server from knowing what subset of data a specific client is retrieving, not preventing the server from knowing the contents of the database. So i don't really see the applicability.