Building a production-grade web scraper with Playwright in Node.js: rate limiting, error recovery, stealth patterns, and data extraction that survives DOM changes.
You write to Postgres, then write to Elasticsearch, then invalidate Redis, then hope nothing failed halfway through. CDC streams the WAL to every downstream consumer in order, with exactly-once semantics, and eliminates the dual-write pattern that corrupts data under load.
Row-by-row INSERT is the slowest way to move data into PostgreSQL. Here is the COPY command, how to use it from Node.js, the error-handling sharp edges, and the benchmark that proves 10x faster bulk loads.