Remove inactive default email services

Note that we no longer generate this by default.
This is for clearing legacy default data.

changelogs/unreleased/remove-inactive-default-email-services.yml

+---
+title: Remove inactive default email services
+merge_request: 8987
+author:

db/post_migrate/20170206040400_remove_inactive_default_email_services.rb

+class RemoveInactiveDefaultEmailServices < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    execute <<-SQL.strip_heredoc
+      DELETE FROM services
+        WHERE type = 'BuildsEmailService'
+          AND active = #{false_value}
+          AND properties = '{"notify_only_broken_builds":true}';
+
+      DELETE FROM services
+        WHERE type = 'PipelinesEmailService'
+          AND active = #{false_value}
+          AND properties = '{"notify_only_broken_pipelines":true}';
+    SQL
+  end
+
+  def false_value
+    quote(false)
+  end
+
+  def quote(value)
+    ActiveRecord::Base.connection.quote(value)
+  end
+end