Bug 414779, Bug 419782, Bug 422037, Bug 423363, Bug 423369, Bug 423372, Bug 423593, Bug 426688, and Bug 427445:
Add foreign key constraints to various tables: bugs_activity, cc, dependencies, votes, attachments, attach_data, duplicates, flags, flagtypes, flagexclusions, flaginclusions
Patches By Tony Fu <tfu@redhat.com> r=mkanat, a=mkanat