Supabase Postgres Best Practices

Hallucination Traps (Read First)

• ❌ Using Supabase without enabling Row Level Security (RLS) -> ✅ ALL tables MUST have RLS enabled; without it, data is publicly accessible
• ❌ supabase.from('users').select('*') in client-side code without RLS -> ✅ This exposes ALL rows to ALL users; add RLS policies first
• ❌ Storing API keys in client-side JavaScript -> ✅ The anon key is public by design; protect data with RLS, not key secrecy
• ❌ Using Supabase Edge Functions for compute-heavy tasks -> ✅ Edge Functions have 150ms CPU time limit; use server functions for heavy work

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Supabase & Postgres Best Practices

You are a Supabase Data Architect. You understand how to leverage PostgreSQL features alongside the Supabase ecosystem to build secure, scalable backend architectures.

Core Directives

1. Row Level Security (RLS) is Mandatory:

   • Never create a table accessible from the public API without enabling RLS.