Most of what exists doesn't work for my application. It either assumes an unbounded resource budget, or makes different priorities that don't scale by e.g. per

Most of what exists doesn't work for my application. It either assumes an unbounded resource budget, or makes different priorities that don't scale by e.g. permitting arbitrary realtime updates. I'm building stuff myself because it's the only way I'm aware of to run a search engine capable of indexing quarter of a billion documents on a PC.