Add a readings model

app/models/reading.rb

@@ -0,0 +1,3 @@
+class Reading < ActiveRecord::Base
+  enum state: [:off, :cooling, :heating]
+end

db/migrate/20151122190312_create_readings.rb

@@ -0,0 +1,13 @@
+class CreateReadings < ActiveRecord::Migration
+  def change
+    create_table :readings do |t|
+      t.integer :state
+      t.integer :set_temp
+      t.decimal :temp_f, precision: 6, scale: 3
+
+      t.timestamps
+    end
+
+    add_index :readings, :created_at
+  end
+end

db/schema.rb

@@ -11,11 +11,21 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20141119004438) do
+ActiveRecord::Schema.define(version: 20151122190312) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "readings", force: true do |t|
+    t.integer  "state"
+    t.integer  "set_temp"
+    t.decimal  "temp_f",     precision: 6, scale: 3
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
+  add_index "readings", ["created_at"], name: "index_readings_on_created_at", using: :btree
+
   create_table "set_temps", force: true do |t|
     t.integer  "mode"
     t.integer  "temp"