Can somebody chime in and say whether this would be a useful solution to recommend similar texts if I compute fastText, doc2vec or other embeddings? What do su

Can somebody chime in and say whether this would be a useful solution to recommend similar texts if I compute fastText, doc2vec or other embeddings? What do such vector similarity queries use in production when there's no DB support? Surely having the "real" DB like Postgres and one for vectors alongside it would be cumbersome.