Is there a way to find out, how strapi deals with the db in the background

I am working on a project that uses strapi as the main backend and i’d like to see which tables, schemas does strapi generates per default and which tables, entities can I generate by myself?
I kinda want to explore the default ERD of Strapi (not my own)
I am using PostgreSQL as a db

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The easiest way would be to setup a fresh strapi project and compare it’s db layout to the one you’re working on

yeah yeah of course
I was wondering if the strapi team itself have something related to this topic