Fix 2 bugs on my Base44 + Supabase app after going live

I built a small web app on Replit with a Supabase database, and it runs perfectly inside the Replit workspace. The problem starts after I deploy it: two things break. The app can't reach my Supabase data once it's live. It loads in preview but the deployed version shows empty pages or errors where the data should be. One of my API calls that pulls in data works in the Replit workspace but fails on the deployed site. I need someone who knows Replit and Supabase to find why it works in preview but not in production, and fix it so the live app loads the data correctly. Everything looks fine on the design side, this is about the Replit deployment breaking the connection. Small, focused job. Please only apply if you've fixed a Replit deployment before, and tell me about a similar one you've done.