Adding embedded PuSH server

db/migrate/20161128103007_create_subscriptions.rb

@@ -0,0 +1,15 @@
+class CreateSubscriptions < ActiveRecord::Migration[5.0]
+  def change
+    create_table :subscriptions do |t|
+      t.string :callback_url, null: false, default: ''
+      t.string :secret
+      t.datetime :expires_at, null: true, default: nil
+      t.boolean :confirmed, null: false, default: false
+      t.integer :account_id, null: false
+
+      t.timestamps
+    end
+
+    add_index :subscriptions, [:callback_url, :account_id], unique: true
+  end
+end