Version-specific Django 5.2/6.0 gotchas: verified CVEs, ORM traps that survive select_related/prefetch_related, signal/transaction race conditions, and decision rules for Ninja vs DRF vs FastAPI.
Cross-engine SQL guidance beyond textbook fundamentals: the GitLab 2017 backup-failure postmortem, why REPEATABLE READ silently permits write skew, sourced connection-pool sizing formulas, and SQL:2023's JSON type and pr...
Production guidance for MongoDB covering embedding vs referencing schema design, compound indexing and index intersection limits, the aggregation pipeline, multi-document transaction costs, and when a document store beat...