But surely there are some deterministic reasons to clean up.

I personally wouldn’t lean towards LLMs on identity resolution. I would like give it the dataset and then ask me questions about specs? I really struggle to find the LLM part reasonable here. I mean potentially some typos, or nicknames, but those could be potentially resolved deterministically also.

I would probably have reviewer running that suggests new rules that I could implement. To me this seems more like compiler work than LLM work.