Readers may also enjoy Steampipe [1], an open source tool to live query 140+ services with SQL (e.g. AWS, GitHub, CSV, Kubernetes, etc). It uses Postgres Foreign Data Wrappers under the hood and supports joins etc with other tables. (Disclaimer - I'm a lead on the project.)
In addition to Postgres FDWs, Steampipe plugins are also available as a SQLite extension [1] or a CLI export tool [2] for lighter weight use cases. (Although a local Postgres has a surprisingly small footprint!) Building plugins as DuckDB extensions would be cool too, but we haven't done that yet.
1 - https://github.com/turbot/steampipe