ALTER TABLE core_group ADD COLUMN leader int(11) NOT NULL default 0;
ALTER TABLE core_group ADD COLUMN is_system int(2) NOT NULL default 0;
+UPDATE core_group SET display_name = name WHERE display_name = '';
+UPDATE core_group SET is_system = 1 WHERE name = 'Administrators';
+
+ALTER TABLE core_group ADD INDEX lookup_leader (leader);
\ No newline at end of file