Comment 0 for bug 740344

I create a project "project1" and user "user1". After that I add the user "user1" to project "project1", this would add an entry in the table user_project_association. Now I can simply go and delete project "project1" from project DB table leaving user_project_association reference dangling .

I believe this also applies for rest of the foreign keys reference instances->fixed_ips etc.