So in Yomichan under Dictionaries – configure installed and enabled dictionaries, I pressed the button “check integrity”. Lo and behold, I had over 100k items of “unassociated data” and when I click for information about this it says:
“The database contains extra data which is not associated with any installed dictionary. Purging the database can fix this issue.”
A quick google search did not reveal how to “purge the database”. I suspect this means to “delete all” dictionaries, something I would rather avoid if possible. Is there another way to “purge the database” or remove unassociated data?