I've seen references to deleting the application link and going in to the database and deleting the link manually if the Stash server is no longer present, but nothing about the actual "impact" of removing the links.
What I'd like to know is: Does the breaking of the link affect the data that has been previously stored within each application (Stash/JIRA)? Does JIRA cache any of the data from Stash or vise-versa that would no longer appear when the link is removed? What would happen if I restored the link? Does everything come back?