XF 2.1 Database cleanup after upgrade

[Nuno]

Hi

I was making a database cleanup after upgrading a notice two minor differences:

TABLE `xf_payment_provider_log`;
  KEY `purchase_request_key` (`purchase_request_key`)

I don't have this key after upgrade from 1.5 and exists in a clean install

TABLE `xf_session_activity` (
  PRIMARY KEY (`user_id`,`unique_key`) USING BTREE,

In a clean install this key isn't using btree, it's just "PRIMARY KEY (`user_id`,`unique_key`)".

Should I correct this?

Thanks