Make subscriptions insert-only

db/migrate/20170920145852_add_deleted_to_subscription.rb

@@ -0,0 +1,5 @@
+class AddDeletedToSubscription < ActiveRecord::Migration
+  def change
+    add_column :subscriptions, :deleted, :boolean
+  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: 20170913054203) do
+ActiveRecord::Schema.define(version: 20170920145852) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -288,6 +288,7 @@ ActiveRecord::Schema.define(version: 20170913054203) do
     t.string   "subscription_type"
     t.datetime "created_at",             null: false
     t.datetime "updated_at",             null: false
+    t.boolean  "deleted"
   end
 
   create_table "tags", force: :cascade do |t|