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.