Fix sign-in database error

supabase/migrations/20251001164722_9e3a781d-aff3-421c-b6eb-6afdf4a254b1.sql

@@ -0,0 +1,46 @@
+-- Fix the email_change column NULL handling issue in auth.users
+-- This addresses the "Scan error on column index 8, name email_change: converting NULL to string is unsupported" error
+
+-- First, create a function to safely update any existing NULL email_change values to empty strings
+CREATE OR REPLACE FUNCTION public.fix_auth_email_change_nulls()
+RETURNS void
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path TO 'auth', 'public'
+AS $$
+BEGIN
+  -- Update any NULL email_change values to empty strings
+  UPDATE auth.users
+  SET email_change = ''
+  WHERE email_change IS NULL;
+END;
+$$;
+
+-- Execute the fix for existing data
+SELECT public.fix_auth_email_change_nulls();
+
+-- Drop the temporary function
+DROP FUNCTION public.fix_auth_email_change_nulls();
+
+-- Update the cancel_user_email_change function to use empty strings instead of NULL
+CREATE OR REPLACE FUNCTION public.cancel_user_email_change(_user_id uuid)
+RETURNS boolean
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path TO 'auth', 'public'
+AS $$
+BEGIN
+  -- Clear all email change related fields in auth.users
+  -- Using empty strings instead of NULL to avoid Supabase Auth scanner issues
+  UPDATE auth.users
+  SET 
+    email_change = '',
+    email_change_sent_at = NULL,
+    email_change_confirm_status = 0,
+    email_change_token_current = '',
+    email_change_token_new = ''
+  WHERE id = _user_id;
+  
+  RETURN FOUND;
+END;
+$$;