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  • "I do not want to have sequence numbers starting at different number for both tables." - what if they're not sequence numbers? Make the IDs A1_{seq} and A2_{seq}? Commented Aug 11, 2016 at 4:19
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    What is the use case from the api consumer? That is in my opinion what you should focus on first. You now start with your existing code structure but that does not necessarily reflect the use case as the consumer. Your hierarchy might just be an implementation detail. Commented Aug 11, 2016 at 10:33