Add Hanami DB classes

app/db/relation.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require "hanami/db/relation"
+
+module Adamantium
+  module DB
+    class Relation < Hanami::DB::Relation
+    end
+  end
+end

app/db/repo.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require "hanami/db/repo"
+
+module Adamantium
+  module DB
+    class Repo < Hanami::DB::Repo
+    end
+  end
+end