Can it clear history caches if it becomes too large?

Can it clear historical caches if they become too large with the time gone?

So for now you can’t but that will change soon.
We’re going to introduce bulk editing soon so you can selectively delete things en masse.

Also if you happen to be someone who had memex still while the history feature was available we give you the ability to clean your data from all the trash you may have indexed and reduce it to the things you actively saved/annotated.