Added missing migrations file.

db/migrate/20150626121711_defaults_calendar_subscriptions_tickets.rb

@@ -0,0 +1,29 @@
+class DefaultsCalendarSubscriptionsTickets < ActiveRecord::Migration
+  def up
+    Setting.create_if_not_exists(
+      title: 'Default calendar Tickets subscriptions',
+      name: 'defaults_calendar_subscriptions_tickets',
+      area: 'Defaults::CalendarSubscriptions',
+      description: 'Defines the default calendar Tickets subscription settings.',
+      options: {},
+      state: {
+        escalation: {
+          own: true,
+          not_assigned: false,
+        },
+        new_open: {
+          own: true,
+          not_assigned: false,
+        },
+        pending: {
+          own: true,
+          not_assigned: false,
+        }
+      },
+      frontend: true
+    )
+  end
+
+  def down
+  end
+end