Index: trunk/packages/sipb-xen-database/sipb-xen-database/sipb_xen_database/models.py
===================================================================
--- trunk/packages/sipb-xen-database/sipb-xen-database/sipb_xen_database/models.py	(revision 160)
+++ trunk/packages/sipb-xen-database/sipb-xen-database/sipb_xen_database/models.py	(revision 168)
@@ -27,5 +27,5 @@
        Column('contact', String, nullable=False),
        Column('uuid', String, nullable=False),
-       Column('boot_off_cd', Boolean, nullable=False, default=False),
+       Column('administrator', String, nullable=False, default=False),
        Column('type_id', String, ForeignKey('types.type_id'), nullable=False),
        Column('autorestart', Boolean, nullable=False, default=False),
@@ -81,7 +81,7 @@
         self.description = description
 
-assign_mapper(ctx, Machine, machine_table, \
-              properties={'nics': relation(NIC),
-                          'disks': relation(Disk),
+assign_mapper(ctx, Machine, machine_table,
+              properties={'nics': relation(NIC, backref="machine"),
+                          'disks': relation(Disk, backref="machine"),
                           'type': relation(Type)});
 assign_mapper(ctx, NIC, nic_table)