diff --git a/db/schema.rb b/db/schema.rb
index a7e3224d2..d84bc636c 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -543,26 +543,23 @@ ActiveRecord::Schema.define(:version => 20151203030635) do
   add_index "documents", ["created_on"], :name => "index_documents_on_created_on"
   add_index "documents", ["project_id"], :name => "documents_project_id"
 
-  create_table "dts", :primary_key => "Num", :force => true do |t|
-    t.string   "Defect",        :limit => 50
-    t.string   "Category",      :limit => 50
-    t.string   "File"
-    t.string   "Method"
-    t.string   "Module",        :limit => 20
-    t.string   "Variable",      :limit => 50
-    t.integer  "StartLine"
-    t.integer  "IPLine"
-    t.string   "IPLineCode",    :limit => 200
-    t.string   "Judge",         :limit => 15
-    t.integer  "Review",        :limit => 1
+  create_table "dts", :force => true do |t|
+    t.string   "IPLineCode"
     t.string   "Description"
-    t.text     "PreConditions", :limit => 2147483647
-    t.text     "TraceInfo",     :limit => 2147483647
-    t.text     "Code",          :limit => 2147483647
+    t.string   "Num"
+    t.string   "Variable"
+    t.string   "TraceInfo"
+    t.string   "Method"
+    t.string   "File"
+    t.string   "IPLine"
+    t.string   "Review"
+    t.string   "Category"
+    t.string   "Defect"
+    t.string   "PreConditions"
+    t.string   "StartLine"
     t.integer  "project_id"
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer  "id",                                  :null => false
+    t.datetime "created_at",    :null => false
+    t.datetime "updated_at",    :null => false
   end
 
   create_table "enabled_modules", :force => true do |t|
@@ -738,17 +735,6 @@ ActiveRecord::Schema.define(:version => 20151203030635) do
 
   add_index "homework_commons", ["course_id", "id"], :name => "index_homework_commons_on_course_id_and_id"
 
-  create_table "homework_detail_groups", :force => true do |t|
-    t.integer  "homework_common_id"
-    t.integer  "min_num"
-    t.integer  "max_num"
-    t.integer  "base_on_project"
-    t.datetime "created_at",         :null => false
-    t.datetime "updated_at",         :null => false
-  end
-
-  add_index "homework_detail_groups", ["homework_common_id"], :name => "index_homework_detail_groups_on_homework_common_id"
-
   create_table "homework_detail_manuals", :force => true do |t|
     t.float    "ta_proportion"
     t.integer  "comment_status"
@@ -905,6 +891,16 @@ ActiveRecord::Schema.define(:version => 20151203030635) do
 
   add_index "journal_details", ["journal_id"], :name => "journal_details_journal_id"
 
+  create_table "journal_details_copy", :force => true do |t|
+    t.integer "journal_id",               :default => 0,  :null => false
+    t.string  "property",   :limit => 30, :default => "", :null => false
+    t.string  "prop_key",   :limit => 30, :default => "", :null => false
+    t.text    "old_value"
+    t.text    "value"
+  end
+
+  add_index "journal_details_copy", ["journal_id"], :name => "journal_details_journal_id"
+
   create_table "journal_replies", :id => false, :force => true do |t|
     t.integer "journal_id"
     t.integer "user_id"