Refactor app in to its own slice

slices/main/repos/top_track_repo.rb

@@ -0,0 +1,17 @@
+module Main
+  module Repos
+    class TopTrackRepo < Adamantium::Repo[:top_tracks]
+      def for_post(id:)
+        top_tracks
+          .where(post_id: id)
+          .to_a
+      end
+
+      def upsert(post_id:, name:, artist:, url:, mb_id:)
+        top_tracks
+          .upsert({name: name, artist: artist, url: url, mb_id: mb_id, post_id: post_id},
+            {target: :post_id, update: {name: name, artist: artist, url: url, mb_id: mb_id, post_id: post_id}})
+      end
+    end
+  end
+end