text: create table save_for_later (
      id serial primary key,
      customer_id integer not null references customers(id) on update restrict on delete restrict,
      sku_id integer not null references skus(id) on update restrict on delete restrict,
      created_at generic_timestamp
  );
  
  create unique index save_for_later_customer_sku on save_for_later (customer_id, sku_id);
  