Where does it run?
On your infrastructure. Docker Compose for a single box, a Helm chart for Kubernetes. SQLite to start, PostgreSQL in production.
Where does my data go?
Nowhere new. Data stays in your storage (S3, MinIO, GCS, your databases) and jobs run on your engines. Cairn keeps the record: what ran, what it cost, who approved.
Can I drive it from the terminal or CI?
Yes. The cairn CLI declares, runs and watches pipelines: cairn pipeline, cairn flow, cairn connect, cairn deploy, cairn worker. Anything the console does, the CLI does.
Is it open source?
Apache 2.0 licensed and self-hosted. Early access now; the source opens with the public release.