+Maybe you shouldn't be able to insert a session if there's currently an open
+session on that port. Or maybe the open session on that port should be flagged
+as problematic? autoclosed? *sigh*
+
+Hmm, sessions refer to current svc_acct records... probably need to constrain
+deletions to svc_acct records such that no svc_acct records are deleted which
+have a session (even if long-closed).