Great question. I have some eviction functions in the Rust library; I don’t expose them through the extension/VFS yet. The open question is less “can I evict?” and more “when should eviction fire?” via user action, via policy, or both.

The obvious policy-driven versions are things like:

- when cache size crosses a limit

- on checkpoint

- every N writes (kind of like autocheckpoint)

- after some idle / age threshold

My instinct is that for the workload I care about, the best answer is probably hybrid. The VFS should have a tier-aware policy internally that users can configure with separate policies for interior/index/data pages. But the user/application may still be in the best position to say “this tenant/session DB is cold now, evict aggressively.”