Setup needed. The suppliers table doesn't exist yet in your Supabase project. To enable saving, open Supabase → Table Editor → New table, name it suppliers, and add these columns: id (text, primary key), name (text), email (text), phone (text), contact (text), website (text), notes (text), created_at (timestamp), updated_at (timestamp). Until then, suppliers you add here only live in your browser for this session.