Index: app/models/query.rb
===================================================================
--- app/models/query.rb	(revision 1336)
+++ app/models/query.rb	(working copy)
@@ -18,7 +18,7 @@
 class QueryColumn  
   attr_accessor :name, :sortable, :default_order
   include GLoc
-  
+
   def initialize(name, options={})
     self.name = name
     self.sortable = options[:sortable]
@@ -58,6 +58,7 @@
   
   validates_presence_of :name, :on => :save
   validates_length_of :name, :maximum => 255
+	validates_uniqueness_of :name, :scope => :user_id
     
   @@operators = { "="   => :label_equals, 
                   "!"   => :label_not_equals,