waddler

A Go binary that reads a YAML pipeline file and runs a complete ETL pipeline using DuckDB as the query engine. No Python environment, no Spark cluster, no Airflow. Describe your sources, write your SQL, declare your output. Run waddler run pipeline.yml.

Supports CSV, JSON, Parquet, Postgres, and MotherDuck as sources. Writes Parquet, CSV, or directly to MotherDuck. Built-in validation rules and cron scheduling.

Built for organizations that have real data needs but not the resources for enterprise tooling: food banks, non-profits, small teams.