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DBeaver has built-in support for diagrams based on an existing database schema:

For linux, dbeaver is the least ugly thing I found. DataGrip looks ugly in 4k with 2.0 scaling, and I dont like the electron based GUIs. Looks like heidi is windows-only, will check with wine.

Dia. https://wiki.gnome.org/Apps/Dia/

f you're using MySQL/MariaDB: MySQL Workbench

https://www.mysql.com/products/workbench/

I use pgModeler for Postgres. Although lately I've been using Valentina Studio and it has a decent schema modeler too.

I use Enterprise Architect at work. If you have money its worth it.

I had a couple of projects where it was the official modelling tool.

Can vouch for it, one of the best experiences with enterprise modelling tools.

I've been looking for something decent in Linux too.

If you don’t need a reverse engineering capability, Draw.io is pretty good:

https://about.draw.io

I prefer lucidchart for being easy to integrate to confluence and share with teams.

erdplus is decent, if you don't need round-tripping or anything fancy.