Materialize the number of finished builds

The NrBuilds table tracks the value of ‘select count(*) from Builds
where finished = 0’, keeping it up to date via a trigger.  This is
necessary to make the /all page fast, since otherwise it needs to do a
sequential scan on the Builds table.

src/lib/Hydra/Schema/NrBuilds.pm

@@ -0,0 +1,75 @@
+use utf8;
+package Hydra::Schema::NrBuilds;
+
+# Created by DBIx::Class::Schema::Loader
+# DO NOT MODIFY THE FIRST PART OF THIS FILE
+
+=head1 NAME
+
+Hydra::Schema::NrBuilds
+
+=cut
+
+use strict;
+use warnings;
+
+use base 'DBIx::Class::Core';
+
+=head1 COMPONENTS LOADED
+
+=over 4
+
+=item * L<Hydra::Component::ToJSON>
+
+=back
+
+=cut
+
+__PACKAGE__->load_components("+Hydra::Component::ToJSON");
+
+=head1 TABLE: C<NrBuilds>
+
+=cut
+
+__PACKAGE__->table("NrBuilds");
+
+=head1 ACCESSORS
+
+=head2 what
+
+  data_type: 'text'
+  is_nullable: 0
+
+=head2 count
+
+  data_type: 'integer'
+  is_nullable: 0
+
+=cut
+
+__PACKAGE__->add_columns(
+  "what",
+  { data_type => "text", is_nullable => 0 },
+  "count",
+  { data_type => "integer", is_nullable => 0 },
+);
+
+=head1 PRIMARY KEY
+
+=over 4
+
+=item * L</what>
+
+=back
+
+=cut
+
+__PACKAGE__->set_primary_key("what");
+
+
+# Created by DBIx::Class::Schema::Loader v0.07033 @ 2013-08-12 17:59:18
+# DO NOT MODIFY THIS OR ANYTHING ABOVE! md5sum:CK8eJGC803nGj0wnete9xg
+
+
+# You can replace this text with custom code or comments, and it will be preserved on regeneration
+1;