Hello folks. I was thinking about the KGS implementation, and after thinking about that.

Could I suggest in the system design interview generated to each URL shortened with the unique ID together?

Something like this:

var pk = ();
var shortenedUrl = pk + "-" + originalUrl
var keyShortenedUrl = ("SHA-256").digest(shortenedUrl)

repository.save(new Model(pk, originalUrl, ("%032X", new BigInteger(1, keyShortenedUrl))));

In this way, I think that we can't key duplication/collision between the keys shortened. What do you about this?