An architectural deep dive into PostgreSQL internals: interpreting EXPLAIN (ANALYZE, BUFFERS), B-Tree vs BRIN indexing mechanics, WAL write path optimization, autovacuum worker tuning, and PgBouncer transaction-mode connection pooling.
Safely evolving relational database schemas without maintenance windows or lock contention: the 5-phase Expand and Contract lifecycle, lock-free column additions, asynchronous batch backfills, and blue-green API deployment backward compatibility.
