diff --git a/app/controllers/heartbeat_controller.rb b/app/controllers/heartbeat_controller.rb
--- a/app/controllers/heartbeat_controller.rb
+++ b/app/controllers/heartbeat_controller.rb
@@ -8,17 +8,18 @@
       return
     end
 
-    hb = HeartBeat.where(user_id: @user.id, ip_address: request.remote_ip).first
-    puts "status = #{params[:status]}"
-    if hb
-      if params[:status]
-        hb.status = params[:status]
-        hb.save
-      end
-      hb.touch
-    else
-      HeartBeat.creae(user_id: @user.id, ip_address: request.remote_ip)
-    end
+    #hb = HeartBeat.where(user_id: @user.id, ip_address: request.remote_ip).first
+    #puts "status = #{params[:status]}"
+    #if hb
+    #  if params[:status]
+    #    hb.status = params[:status]
+    #    hb.save
+    #  end
+    #  hb.touch
+    #else
+    #  HeartBeat.creae(user_id: @user.id, ip_address: request.remote_ip)
+    #end
+    HeartBeat.create(user_id: @user.id, ip_address: request.remote_ip, status: params[:status])
     render text: "OK"
   end
 
diff --git a/db/schema.rb b/db/schema.rb
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -15,12 +15,12 @@
 
   create_table "announcements", :force => true do |t|
     t.string   "author"
-    t.text     "body",         :limit => 16777215
+    t.text     "body"
     t.boolean  "published"
-    t.datetime "created_at",                                          :null => false
-    t.datetime "updated_at",                                          :null => false
-    t.boolean  "frontpage",                        :default => false
-    t.boolean  "contest_only",                     :default => false
+    t.datetime "created_at",                      :null => false
+    t.datetime "updated_at",                      :null => false
+    t.boolean  "frontpage",    :default => false
+    t.boolean  "contest_only", :default => false
     t.string   "title"
     t.string   "notes"
   end
@@ -50,19 +50,19 @@
   end
 
   create_table "descriptions", :force => true do |t|
-    t.text     "body",       :limit => 16777215
+    t.text     "body"
     t.boolean  "markdowned"
-    t.datetime "created_at",                     :null => false
-    t.datetime "updated_at",                     :null => false
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
   end
 
   create_table "grader_configurations", :force => true do |t|
     t.string   "key"
     t.string   "value_type"
     t.string   "value"
-    t.datetime "created_at",                      :null => false
-    t.datetime "updated_at",                      :null => false
-    t.text     "description", :limit => 16777215
+    t.datetime "created_at",  :null => false
+    t.datetime "updated_at",  :null => false
+    t.text     "description"
   end
 
   create_table "grader_processes", :force => true do |t|
@@ -105,10 +105,10 @@
     t.integer  "sender_id"
     t.integer  "receiver_id"
     t.integer  "replying_message_id"
-    t.text     "body",                :limit => 16777215
+    t.text     "body"
     t.boolean  "replied"
-    t.datetime "created_at",                              :null => false
-    t.datetime "updated_at",                              :null => false
+    t.datetime "created_at",          :null => false
+    t.datetime "updated_at",          :null => false
   end
 
   create_table "problems", :force => true do |t|
@@ -150,7 +150,7 @@
 
   create_table "sessions", :force => true do |t|
     t.string   "session_id"
-    t.text     "data",       :limit => 16777215
+    t.text     "data"
     t.datetime "updated_at"
   end
 
@@ -178,14 +178,14 @@
     t.integer  "user_id"
     t.integer  "problem_id"
     t.integer  "language_id"
-    t.text     "source",                :limit => 16777215
+    t.text     "source"
     t.binary   "binary"
     t.datetime "submitted_at"
     t.datetime "compiled_at"
-    t.text     "compiler_message",      :limit => 16777215
+    t.text     "compiler_message"
     t.datetime "graded_at"
     t.integer  "points"
-    t.text     "grader_comment",        :limit => 16777215
+    t.text     "grader_comment"
     t.integer  "number"
     t.string   "source_filename"
     t.float    "max_runtime"
@@ -206,10 +206,10 @@
 
   create_table "test_pairs", :force => true do |t|
     t.integer  "problem_id"
-    t.text     "input",      :limit => 2147483647
-    t.text     "solution",   :limit => 2147483647
-    t.datetime "created_at",                       :null => false
-    t.datetime "updated_at",                       :null => false
+    t.text     "input",      :limit => 16777215
+    t.text     "solution",   :limit => 16777215
+    t.datetime "created_at",                     :null => false
+    t.datetime "updated_at",                     :null => false
   end
 
   create_table "test_requests", :force => true do |t|
@@ -220,13 +220,13 @@
     t.string   "output_file_name"
     t.string   "running_stat"
     t.integer  "status"
-    t.datetime "updated_at",                           :null => false
+    t.datetime "updated_at",       :null => false
     t.datetime "submitted_at"
     t.datetime "compiled_at"
-    t.text     "compiler_message", :limit => 16777215
+    t.text     "compiler_message"
     t.datetime "graded_at"
     t.string   "grader_comment"
-    t.datetime "created_at",                           :null => false
+    t.datetime "created_at",       :null => false
     t.float    "running_time"
     t.string   "exit_status"
     t.integer  "memory_usage"
@@ -254,10 +254,10 @@
     t.boolean  "activated",                     :default => false
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.string   "section"
     t.boolean  "enabled",                       :default => true
     t.string   "remark"
     t.string   "last_ip"
+    t.string   "section"
   end
 
   add_index "users", ["login"], :name => "index_users_on_login", :unique => true