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01
Country flashcards
Simple flashcards for each country: flag, map and charts.
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02
Storage internals
Working through database storage engines by building them: B+ trees, LSM trees, compaction, buffer pools, MVCC, write-ahead logs. Notes as I go, organised around numbers I actually measured.
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03
Networking
One HTTPS request onto the wire: the OSI layers it's wrapped in, the TCP and TLS handshakes it waits on, and how HTTP/1.1 → 2 → 3 changed what happens next.