I have used pgModeler(https://pgmodeler.io https://pgmodeler.io) some time ago for this and mysql workbench for mysql. It was still a bit unstable the last time

I have used pgModeler(https://pgmodeler.io https://pgmodeler.io) some time ago for this and mysql workbench for mysql. It was still a bit unstable the last time I tried it but it's pretty nice when it works.