Labels need to be valid on name

app/models/label.rb

@@ -9,7 +9,10 @@ class Label < ActiveRecord::Base
   validates :project, presence: true
 
   # Don't allow '?', '&', and ',' for label titles
-  validates :title, presence: true, format: { with: /\A[^&\?,&]*\z/ }
+  validates :title,
+            presence: true,
+            format: { with: /\A[^&\?,&]*\z/ },
+            uniqueness: true
 
   scope :order_by_name, -> { reorder("labels.title ASC") }