This page covers tools for generating database diagrams.
Home > https://dbeaver.io
It allows to generate an EntityRelationship Diagram (ERD) from an existing database.
Other features include an SQL Editor for executing queries, etc.
sudo snap install dbeaver-ce
Note: Run it from the dash looking for: DBeaver Community
The 1st step is to configure a new connection to a database. The following example uses a local DBMS with a database named 'sampledb' using 'sampleuser'
Host: localhost Port: 5432
Database: sampledb
Authentication: Database Native
Username: sampleuser
Password: ****
Let's generate and export an EntityRelationship diagram in .png format.
Double-click in "Tables" (postgres > sampledb > Schemas > public > Tables) which will open 2 tabs: Properties & ER Diagram
Click tab "ER Diagram" and click button 'Save diagram in external format' (located in the botton-right).