Supabase Common Errors Overview Diagnostic guide for Supabase errors across PostgREST ( ), PostgreSQL (numeric codes), Auth, Storage, and Realtime. Identify the error layer, trace the root cause, and apply the correct fix — every SDK call returns where is null when exists. Prerequisites - installed ( ) - and (or ) configured - Access to Supabase Dashboard (for log inspection and SQL Editor) - Supabase CLI installed for local development ( ) Instructions Step 1 — Capture the Error Object Every Supabase SDK call returns a tuple. Never assume exists — always check first. Troubleshooting: If is u…