If I wanted to understand datahub's models and storage what all pages should I read other than this https://datahubproject.io/docs/metadata-modeling/metadata-model. This will help me in deploying/managing it in an easier way. e.g. currently I am stuck with schema registry. I wish to understand where exactly it fits. That will hopefully help me understand where to look for errors and maybe send a PR to fix things if I understand it well enough.

What are you stuck on with respect to the schema registry?