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for designing data systems at scale, the gold standard is Designing Data-Intensive Applications by Martin Kleppmann. it's practical, modern, and covers the big trade-offs; if you want broader context, Database Internals (Petrov) and Site Reliability Engineering (Google) are solid companions; as for libraries, the old-school O'Reilly Safari Books (now O'Reilly Learning) is still around with a big cloud section, and alternatives like Packt or Manning's subscription libraries give you that "bookshelf" feel online