Migrate from embedded covers to assets

lib/music_library/worker/extract_colors.ex

@@ -1,14 +1,15 @@
 defmodule MusicLibrary.Worker.ExtractColors do
   use Oban.Worker, queue: :heavy_writes, max_attempts: 3
 
-  alias MusicLibrary.{Colors, Records}
+  alias MusicLibrary.{Assets, Colors, Records}
 
   @impl Oban.Worker
   def perform(%Oban.Job{args: %{"id" => record_id, "method" => method}}) do
     record = MusicLibrary.Records.get_record!(record_id)
+    asset = Assets.get!(record.cover_hash)
     method = String.to_existing_atom(method)
 
-    with {:ok, colors} <- Colors.extract_colors(record.cover_data, method),
+    with {:ok, colors} <- Colors.extract_colors(asset.content, method),
          {:ok, updated_record} <- Records.update_record(record, %{dominant_colors: colors}) do
       MusicLibrary.Records.notify_update(updated_record)
     end