Deleting ticket changes which are spam

Here's how I deleted a bunch of spam links added by the user 'seekgzl' in one go:

 cd /group/project/proofgeneral/data/trac-project-env/db/
 sqlite3 trac.db
 delete from ticket_change where author='seekgzl';

or for spam tickets:

  delete from ticket where id='395';

The ​TicketDeletePlugin is ~supposed to provide an interface to help delete tickets or ticket changes~ now integrated into Trac 0.12.x, but my attempt to install it didn't work and the 'delete' button should appear beside tickets when logged in as an administrative user.