Test suite starts covering HTTP interface.

+ Added some files missing in previous commits.

TrsrDB/Category.pm

@@ -0,0 +1,19 @@
+use strict;
+
+package TrsrDB::Category;
+use base qw/DBIx::Class::Core/;
+
+__PACKAGE__->table('category');
+__PACKAGE__->add_columns(qw/ID label/);
+__PACKAGE__->set_primary_key('ID');
+
+__PACKAGE__->has_many(
+    debits => 'TrsrDB::Debit',
+    { 'foreign.category' => 'self.ID' }
+);
+__PACKAGE__->has_many(
+    credits => 'TrsrDB::Credit',
+    { 'foreign.category' => 'self.ID' }
+);
+
+1;