when ha would cost the same i.e. ~20€ than that would be amazingly cheap. i mean on aws you would pay the same (20 €), but you need to pay 1 year upfront.. and if ha would be like 16 € you would only be a little bit more expensive than a 3 year aws rds offering (1€ per month), which is less a problem since the storage is cheaper and you are way more flexible (canceling and recreating to a bigger instance)