System
Systems programming and infrastructure — databases, service migration, and operational patterns.
PostgreSQL 19's new WAIT FOR LSN command lets a replica block until it has replayed your write. The read-after-write problem it solves, the workarounds it replaces, and what the timeout, status, and mode options are actually for.
Master shadow testing for large-scale system migrations. Learn to safely rewrite services by comparing outputs between old and new implementations.
Emulate Python's random.choice in SQLite using JSON arrays and the random() function. Populate tables with realistic test data efficiently.