Is there any documentation showing what kind of performance is given up by shoving a userspace server into the SQLite read path? LiteFS looks cool but I'd be worried about all block IO basically becoming a cross-process RPC negating large chunks of SQLite's efficiency. Instinct is screaming this should be a VFS extension for SQLite, but definitely appreciate the idea of doing it as a virtual filesystem.

In terms of pure perversion, I'm wondering if fanotify or kernel tracepoints could be used to gather the information needed asynchronously rather than sticking a userspace server in the way