How do you delete a content type's URL aliases in bulk? I have a content type where I want to delete all of its URL aliases in bulk. Currently the pathauto url alias page only has the option to delete all content url aliases regardless of what type it is. 

How can you delete url aliases in bulk matching only a specific content type?

Also would it be okay to delete the url_aliases via phpmyadmin? I'm not sure if the url_aliases table is linked to something else.
I'd do it as an SQL query. Run as a SELECT first, to verify that all is well:

 SELECT alias FROM node n JOIN url_alias u ON CONCAT('node/', n.nid) =
 u.source WHERE n.type='my_type'


then edit it to make it a DELETE:

 DELETE u  FROM node n JOIN url_alias u ON CONCAT('node/', n.nid) =
 u.source WHERE n.type='my_type'