You post a number of "issues" and mention various databases. I'm not sure what the aim is of your question.
With everytihng, there are design limitations that much is a given. The question is what do you need as an end result and what are the tools that best fit that end result.
Choose a DB that fits, and work with the constraints of that database.
If you have something really concrete, then that may help much better to get to a solution
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You post a number of "issues" and mention various databases. I'm not sure what the aim is of your question.
With everytihng, there are design limitations that much is a given. The question is what do you need as an end result and what are the tools that best fit that end result.
Choose a DB that fits, and work with the constraints of that database.
If you have something really concrete, then that may help much better to get to a solution