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Is this on GitHub to take a look at the code?

Currently it‘s not open sourced. Eventually considering it for the future though.

Thank you. Look forward to it! How is the data model visuzalization built? Does Duckdb provide that out of the box?

No, it's implemented via parsing the current schema and translating it to a Mermaid ERD, see https://mermaid.js.org/syntax/entityRelationshipDiagram.html