Comment by fasa99

For what it's worth, back in the day (a few years ago, before the LLM boom a few years) I found on a similar sized vector database (gensim / doc2vec), it's possible to just brute force a vector search e.g. with SSE or AVX type instructions. You can code it in C and have a python API. Your data appears to be a few gigs so that's feasible for realtime CPU brute force, <200 ms