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This is my problem with these local first libraries. What happens if there's some data that needs to live in a db that's separate from the replicated sqlite db?

What I would really love is a sync engine library that is agnostic of your database.

Haven't really seen one yet.

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Exactly. So many local first libs don't cover this that it makes me wonder if the applications I am typically working on are so fundamentally different from what the local-first devs are normally building?

Most apps have user data that needs to be (partially or fully) shielded from other users. Yet, most local-first libs neglect to explain how to implement this with their libraries, or sometimes it's an obscure page or footnote somewhere in their docs, as if this is just an afterthought...

It's definitely quite a hard engineering problem to solve, if you try to cover a wide range of use cases, and layer on top of that things like permissions/authorization and scalability

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