Ask HN: Courses, case studies, or books for system design interviews?

I'm looking for battle-tested prep materials for the system design round of a typical SWE interview. You know the format: "design the back end for a scalable web crawler," "outline how you'd build FB Messenger," and so on.

"Grokking the System Design Interview" by Design Gurus on the Educative site is a start and has helped me significantly, but their designs have a pretty distinctive character. Kleppmann's DDIA is a good read, but focuses on the design of components, rather than end-to-end applications. Case studies in AOSA are generally too short and too specific to be useful.

What else out there is relatively complete (i.e., a whole narrative, not just fragmentary blog posts) and useful for actually designing systems, not just BSing in front of a dry-erase board?