Lesson: PUBLIC_ env vars not in SvelteKit server code

Problem

Second Brain API was returning 500 errors in production with "supabaseUrl is required"

Root Cause

SvelteKit server code was trying to access env.PUBLIC_SUPABASE_URL from $env/dynamic/private.

In SvelteKit:

• PUBLIC_ prefixed vars → only in $env/dynamic/public or $env/static/public
• $env/dynamic/private → only non-PUBLIC vars

Fix

1. Added SUPABASE_URL=https://... to .env (without PUBLIC_ prefix)
2. Updated all server files to use env.SUPABASE_URL instead of env.PUBLIC_SUPABASE_URL
3. Added SUPABASE_URL to Vercel environment variables

Files Changed

• src/lib/server/auth.ts
• src/lib/server/embeddings.ts
• src/routes/api/*/+server.ts (all API routes)

Commit

080b629