If it's the same backend handling multiple chained requests that happen to use the same database, it could in turn build a single big SQL query to generate the

If it's the same backend handling multiple chained requests that happen to use the same database, it could in turn build a single big SQL query to generate the result(s). I used to write stuff like this all the time (not specifically Cap'n Proto servers, but general functional expression -> SQL -> here's your answer engines).