Index: trunk/Nebulous-Server/lib/Nebulous/Server/SQL.pm
===================================================================
--- trunk/Nebulous-Server/lib/Nebulous/Server/SQL.pm	(revision 24384)
+++ trunk/Nebulous-Server/lib/Nebulous/Server/SQL.pm	(revision 24386)
@@ -455,5 +455,7 @@
     FOREIGN KEY(parent_id) REFERENCES directory(dir_id),
     PRIMARY KEY(dir_id),
-    KEY(parent_id)
+    KEY(parent_id),
+    KEY(dirname),
+    UNIQUE(dirname, parent_id)
 ) ENGINE=innodb DEFAULT CHARSET=latin1;