Author here - previously posted here: https://news.ycombinator.com/item?id=47874647

Key difference vs SQL polling is that we’re touching metadata instead of data pages. I have work in process to make this work without any polling (innotify, kqueue, mmap’d shm file check) after the original stat(2) direction proved unreliable if lightweight.

Would love your feedback and or contributions in the repo - still figuring out the end shape.