The topic reminds me at least these two documents, which shows in more detail how simple but well-thought data model can create great results.

https://www.notion.com/blog/data-model-behind-notion

https://git-scm.com/book/en/v2/Git-Internals-Git-Objects

Having worked with real business databases, I truly believe and feel that foundational information modeling (database schema, data types) makes or breaks the utility and capabilities of that data.