Add podcasts and map view

lib/adamantium/persistence/relations/podcasts.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module Adamantium
+  module Persistence
+    module Relations
+      class Podcasts < ROM::Relation[:sql]
+        schema :podcasts, infer: true
+
+        auto_struct(true)
+      end
+    end
+  end
+end