device_ignore table to track devices to skip in polling

lib/App/Netdisco/DB/Result/Admin.pm

@@ -114,4 +114,17 @@ between the date stamp and time stamp. That is:
 
 sub finished_stamp  { return (shift)->get_column('finished_stamp')  }
 
+=head1 RELATIONSHIPS
+
+=head2 ignored
+
+Retuns the set of C<device_ignore> entries which may apply to this job. They
+match the device IP and job action, and may refer to one or more backends.
+
+=cut
+
+__PACKAGE__->has_many( ignored => 'App::Netdisco::DB::Result::DeviceIgnore',
+   { 'foreign.device' => 'self.device', 'foreign.action' => 'self.action' },
+);
+
 1;