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;

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

@@ -0,0 +1,23 @@
+use utf8;
+package App::Netdisco::DB::Result::DeviceIgnore;
+
+use strict;
+use warnings;
+
+use base 'DBIx::Class::Core';
+__PACKAGE__->table("device_ignore");
+__PACKAGE__->add_columns(
+  "backend",
+  { data_type => "text", is_nullable => 0 },
+  "device",
+  { data_type => "inet", is_nullable => 0 },
+  "action",
+  { data_type => "text", is_nullable => 0 },
+  "failures",
+  { data_type => "integer", is_nullable => 1, default_value => '0' },
+  "ignore",
+  { data_type => "boolean", is_nullable => 1, default_value => \'false' },
+);
+__PACKAGE__->set_primary_key("backend", "device", "action");
+
+1;