idempotent
여러 번 적용하더라도 결과가 달라지지 않는 성질
not same as stateless
Every Programmer Should Know #1: Idempotency
In the world of programming, there are many concepts that every developer should understand in order to build efficient and reliable systems. One such vital concept is idempotency, which refers to the property of an operation or function that produces the same result when applied multiple times as it does
https://www.berkansasmaz.com/every-programmer-should-know-idempotency/

Seonglae Cho