adds timestamps to polls

db/migrate/20171212193323_add_timestamps_to_polls.rb

@@ -0,0 +1,5 @@
+class AddTimestampsToPolls < ActiveRecord::Migration
+  def change
+    add_timestamps :polls, null: true
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20171127230716) do
+ActiveRecord::Schema.define(version: 20171212193323) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -798,6 +798,8 @@ ActiveRecord::Schema.define(version: 20171127230716) do
     t.datetime "hidden_at"
     t.boolean  "results_enabled",    default: false
     t.boolean  "stats_enabled",      default: false
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
   add_index "polls", ["starts_at", "ends_at"], name: "index_polls_on_starts_at_and_ends_at", using: :btree