https://community.databricks.com/t5/databricks-free-edition-help/databricks-quest-4-deploy-your-first-databricks-app-success/m-p/168237#M905 <H3><STRONG><span class="lia-unicode-emoji" title=":rocket:">🚀</span> Deployed Databricks AppKit + Lakebase: 2 Tricky Bugs &amp; How I Solved Them!</STRONG></H3><P>Just deployed my first full-stack Databricks App using the AppKit Lakebase (PostgreSQL) template on serverless compute!</P><P>Using <STRONG>Gemini as an AI debugging agent</STRONG> via raw CLI logs in WSL, I diagnosed and resolved two critical roadblocks:</P><UL><LI><P><STRONG>Bug 1: Missing DABs Variables (postgres_project)</STRONG></P><UL><LI><P><STRONG>Fix:</STRONG> Added postgres_project, postgres_branch, and postgres_database directly under the variables: block in databricks.yml to unblock databricks apps deploy.</P></LI></UL></LI><LI><P><STRONG>Bug 2: "Failed to Fetch Todos" (Silent Permission Denied 42501)</STRONG></P><UL><LI><P><STRONG>Root Cause:</STRONG> Testing locally (npm run dev) first meant <I>my personal user</I> owned the app schema. The deployed app runs under a <STRONG>Service Principal</STRONG>, which was denied write access.</P></LI><LI><P><STRONG>Fix:</STRONG> Dropped the schema via DROP SCHEMA IF EXISTS app CASCADE; in the SQL Editor and redeployed. The Service Principal recreated the schema and took proper ownership!</P></LI></UL></LI></UL><P><STRONG><span class="lia-unicode-emoji" title=":light_bulb:">💡</span> Pro-tip:</STRONG> When building with Lakebase, <I>deploy first, test locally second</I> so your App's Service Principal owns the schema from day one!</P> Thu, 10 Sep 2026 14:30:28 GMT User_sky 2026-09-10T14:30:28Z https://community.databricks.com/t5/databricks-free-edition-help/databricks-quest-4-deploy-your-first-databricks-app-success/m-p/168237#M905 <H3><STRONG><span class="lia-unicode-emoji" title=":rocket:">🚀</span> Deployed Databricks AppKit + Lakebase: 2 Tricky Bugs &amp; How I Solved Them!</STRONG></H3><P>Just deployed my first full-stack Databricks App using the AppKit Lakebase (PostgreSQL) template on serverless compute!</P><P>Using <STRONG>Gemini as an AI debugging agent</STRONG> via raw CLI logs in WSL, I diagnosed and resolved two critical roadblocks:</P><UL><LI><P><STRONG>Bug 1: Missing DABs Variables (postgres_project)</STRONG></P><UL><LI><P><STRONG>Fix:</STRONG> Added postgres_project, postgres_branch, and postgres_database directly under the variables: block in databricks.yml to unblock databricks apps deploy.</P></LI></UL></LI><LI><P><STRONG>Bug 2: "Failed to Fetch Todos" (Silent Permission Denied 42501)</STRONG></P><UL><LI><P><STRONG>Root Cause:</STRONG> Testing locally (npm run dev) first meant <I>my personal user</I> owned the app schema. The deployed app runs under a <STRONG>Service Principal</STRONG>, which was denied write access.</P></LI><LI><P><STRONG>Fix:</STRONG> Dropped the schema via DROP SCHEMA IF EXISTS app CASCADE; in the SQL Editor and redeployed. The Service Principal recreated the schema and took proper ownership!</P></LI></UL></LI></UL><P><STRONG><span class="lia-unicode-emoji" title=":light_bulb:">💡</span> Pro-tip:</STRONG> When building with Lakebase, <I>deploy first, test locally second</I> so your App's Service Principal owns the schema from day one!</P> Thu, 10 Sep 2026 14:30:28 GMT https://community.databricks.com/t5/databricks-free-edition-help/databricks-quest-4-deploy-your-first-databricks-app-success/m-p/168237#M905 User_sky 2026-09-10T14:30:28Z