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  • How does this Question differ from dba.stackexchange.com/questions/303200/… ? Commented Nov 28, 2021 at 16:48
  • @Rick James it covers the entire approach of the datatype determination and ideal length calculation, plus the issue with the fix key length. Just in case the API identifier size or encryption key change, I wanted to additionally assure that I understant why I do as you said, and not only that I should do it. But thx a lot for ur help again, really appreciated! Commented Nov 28, 2021 at 22:19