Database used by eCloud is Cassandra. This is NoSQL database so there aren't typical relational schema.
The schema created using drawio free software (https://drawio-app.com/)
is in GIT repository here: https://git.man.poznan.pl/stash/projects/EC/repos/europeana-cloud/browse/docs
Below is "fast look" for schema (*.svg file) but NOTE that latest version and one valid is in GIT repository
