My ask is 15 years old[1], a live SQL extension. Allow a query to be a subscription to a database, so any updates get streamed as deltas to a listening client. There were a ton of times in my time using SQL where the same query is run over and over, just to get/handle that delta.

Wouldn't it be a lot more efficient to just work that way in the first place?

[1] http://livesql.org/ <--- just a few paragraphs of text from 2011