Index: app/models/issue.rb
===================================================================
--- app/models/issue.rb	(revision 448)
+++ app/models/issue.rb	(working copy)
@@ -35,6 +35,7 @@
   validates_presence_of :subject, :description, :priority, :tracker, :author, :status
   validates_inclusion_of :done_ratio, :in => 0..100
   validates_associated :custom_values, :on => :update
+  validates_uniqueness_of :subject
 
   # set default status for new issues
   def before_validation
@@ -68,8 +69,8 @@
       custom_values.each {|c|
         @current_journal.details << JournalDetail.new(:property => 'cf', 
                                                       :prop_key => c.custom_field_id,
-                                                      :old_value => @custom_values_before_change[c.custom_field_id],
-                                                      :value => c.value) unless @custom_values_before_change[c.custom_field_id]==c.value
+                                                      :old_value => (@custom_values_before_change[c.custom_field_id].length > 250 ? @custom_values_before_change[c.custom_field_id].slice(0..250) + "..." : @custom_values_before_change[c.custom_field_id]),
+                                                      :value => (c.value.length > 250 ? c.value.slice(0..250) + "..." : c.value)) unless (@custom_values_before_change[c.custom_field_id]==c.value || @custom_values_before_change[c.custom_field_id].nil? || c.value.nil? )
       }      
       @current_journal.save unless @current_journal.details.empty? and @current_journal.notes.empty?
     end