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  • Hi @Robert Bräutigam, thanks for the answer and the reminder not follow books like a religion. Yes the database can definitely do it, however I actually do like being able to encapsulate the domain within a single layer, this has two benefits in my humble point of view, first it allows me to easily test this invariant in a unit test without spinning up a database and secondly changing code is much easier than changing the database, it makes spinning up different environments easier, migrating database easier and changing the specifics of the constraint easier. Commented Jul 5, 2021 at 19:31
  • BTW "it makes spinning up different environments easier, migrating database easier and changing the specifics of the constraint easier" are all incidents that happened on the same product, that I am trying to refactor into a pattern or using a process to help us mitigate these things easier Commented Jul 5, 2021 at 19:32
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    @MazenElkashef You know your requirements/preferences, ultimately it is up to you to evaluate all trade-offs. Obviously. I'm just talking about my experiences. We did this in the early days of JEE all the time. I mean re-implementing stuff from the database, because we wanted to be database agnostic. It was a mess and a lot of wasted work every single time. Your mileage may vary however. Commented Jul 5, 2021 at 19:39
  • Thanks @Robert Bräutigam, as I said I am new to DDD and I just wanted to see if I completely missed an aspect in DDD or in SW engineering but it seems like I am not too far from the "right" implementation, I just wanted to make sure I am not completely off, or if there is a design smell, etc. cheers! Commented Jul 5, 2021 at 19:42