Learn why LIMIT/OFFSET pagination falls apart on large tables and how to replace it with keyset (cursor) pagination: tuple comparison, the right composite index, opaque cursors for your API, common pitfalls, and when to use each approach. Includes production-ready code in SQL and Python.
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Learn to design indexes that genuinely speed up your queries: B-tree, composite, partial, and covering indexes. Includes how to read EXPLAIN ANALYZE, correct column ordering, the mistakes that silently disable an index, and what's new in PostgreSQL 18.
Learn how idempotency keys turn unreliable networks into predictable APIs, so retries, timeouts, and double-clicks never create a duplicate payment or order. Covers server-side implementation, concurrency handling, what to cache, and common pitfalls.
Protect your APIs from abuse and traffic spikes with rate limiting. Compare the fixed window, sliding window, and token bucket algorithms, implement them atomically in Redis with Lua, return the right 429 headers, and avoid the mistakes that silently void your limits. With production-ready code.