Fix email change token schema

supabase/migrations/20251001165241_5d90432f-6a24-4328-8d36-ade18b137957.sql

@@ -0,0 +1,26 @@
+-- Fix all email change token columns to use empty strings instead of NULL
+-- This addresses Supabase Auth scanner issues with NULL string columns
+
+-- Create a function to update all NULL token values to empty strings
+CREATE OR REPLACE FUNCTION public.fix_auth_email_tokens()
+RETURNS void
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path TO 'auth', 'public'
+AS $$
+BEGIN
+  -- Update all NULL email change token values to empty strings
+  UPDATE auth.users
+  SET 
+    email_change_token_current = COALESCE(email_change_token_current, ''),
+    email_change_token_new = COALESCE(email_change_token_new, '')
+  WHERE email_change_token_current IS NULL 
+     OR email_change_token_new IS NULL;
+END;
+$$;
+
+-- Execute the fix
+SELECT public.fix_auth_email_tokens();
+
+-- Drop the temporary function
+DROP FUNCTION public.fix_auth_email_tokens();