Save display times in the db

test/models/completion_test.rb

@@ -2,13 +2,15 @@
 #
 # Table name: completions
 #
-#  id            :integer          not null, primary key
-#  time_seconds  :integer
-#  created_at    :datetime         not null
-#  updated_at    :datetime         not null
-#  contest_id    :integer          not null
-#  contestant_id :integer          not null
-#  puzzle_id     :integer          not null
+#  id                      :integer          not null, primary key
+#  display_relative_time   :string
+#  display_time_from_start :string
+#  time_seconds            :integer
+#  created_at              :datetime         not null
+#  updated_at              :datetime         not null
+#  contest_id              :integer          not null
+#  contestant_id           :integer          not null
+#  puzzle_id               :integer          not null
 #
 # Indexes
 #

test/models/contestant_test.rb

@@ -2,12 +2,13 @@
 #
 # Table name: contestants
 #
-#  id         :integer          not null, primary key
-#  email      :string
-#  name       :string
-#  created_at :datetime         not null
-#  updated_at :datetime         not null
-#  contest_id :integer          not null
+#  id           :integer          not null, primary key
+#  display_time :string
+#  email        :string
+#  name         :string
+#  created_at   :datetime         not null
+#  updated_at   :datetime         not null
+#  contest_id   :integer          not null
 #
 # Indexes
 #