build model from existing db

Dear list,

I have an existing PostgreSQL DB and I would like to draw a model of the DB
structure. Is there some software (Freeware) around that can read the
existing structure of my DB and automatically draw e.g. an ER-model of that?
The software that I have found so far (e.g. Open System Architect) seems to
be able to build models from scratch and convert them into a DB, but not the
other way around like what I need.

Best-
Stefan

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