stores a proposal notification

db/migrate/20160601103338_create_proposal_notifications.rb

@@ -0,0 +1,12 @@
+class CreateProposalNotifications < ActiveRecord::Migration
+  def change
+    create_table :proposal_notifications do |t|
+      t.string :title
+      t.text :body
+      t.integer :author_id
+      t.integer :proposal_id
+
+      t.timestamps null: false
+    end
+  end
+end