that is reason many older developer tend to do everything biz logic etc all in db store procedure/functions/view, etc. The cost of getting the data is native, no connection pooling needed, and with V8/python integration in the PG, it is non trivial what language you use. If you are dealing with large amount of data in a db, why not just do everything there. DB like sql has cursor, merge, that makes manipulating large set of data much easier than moving it on to another language environment.