Implement PostgreSQL function to cancel email change

supabase/migrations/20251001160858_95431631-c4fa-471a-9c1f-7684bdf416d0.sql

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+-- Create a function to cancel pending email changes
+-- This function runs with SECURITY DEFINER privileges to access auth.users table
+CREATE OR REPLACE FUNCTION public.cancel_user_email_change(_user_id UUID)
+RETURNS BOOLEAN
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = auth, public
+AS $$
+BEGIN
+  -- Clear all email change related fields in auth.users
+  UPDATE auth.users
+  SET 
+    email_change = NULL,
+    email_change_sent_at = NULL,
+    email_change_confirm_status = 0,
+    email_change_token_current = NULL,
+    email_change_token_new = NULL
+  WHERE id = _user_id;
+  
+  RETURN FOUND;
+END;
+$$;