I suggest you ...

ER Layers

It would be good to be able to model all 3 layers of an ER/Data Model Diagram from one ER layer :
https://en.wikipedia.org/wiki/Logical_data_model )

It would require addition properties for elements and then columns, and a way for relationships to be managed.

But then at the clock of a button, you could display the CDM, LDM and PDM.

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