yaml 대체

snakeyaml ->  jackson-dataformat-yaml

unix timestamp 13 digit compare

Intstant instant = Instant.ofEpochMilli(Long.parseLong(String timestamp));

Instant current = Instant.now();

instant.compareTo(current);

1 : t1 > t2

0 : t1 == t2

-1 : t1 < t2

Cause-Effect - draft

 https://www.geeksforgeeks.org/cause-effect-graphing-in-software-engineering/