Orchestrating Reliable Data Ingestion from S3 with Airflow

This post walks through a minimal Airflow pipeline that uploads local CSV or NDJSON files to S3, then loads them into a cloud data warehouse with `COPY INTO`. The pattern keeps orchestration in Airflow, raw files in object storage, and ingestion plus analytics in the warehouse layer. It also gives you a practical starting point for retries, replay, credential handling, and production hardening