Databricks Free Edition — one $0, serverless-only, no-cloud end-to-end tutorial walked as 14 ordered stages: setup (CLI · UC · dbt) → lakebase (serverless Postgres 17 + Data API) → lakehouse (medallion 3 ways (notebook/dbt/SDP) + CDC) → analytics (Metric Views + AI/BI + Genie + ai_query) → retrieval (Mosaic AI Vector Search + pgvector-in-Lakebase over the contract docs). Start with /silver-databricks-end-to-end:start.
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