Charts: count by artists and count by genre

Generated via Cursor and Claude 3.5 - initial version

lib/music_library/records.ex

@@ -267,4 +267,38 @@ defmodule MusicLibrary.Records do
   def change_record(%Record{} = record, attrs \\ %{}) do
     Record.changeset(record, attrs)
   end
+
+  @doc """
+  Returns a list of tuples containing artist names and their record count,
+  ordered by count in descending order.
+  """
+  def count_records_by_artist do
+    q =
+      from r in fragment("""
+           select json_extract(artist.value, '$.name') as name, count(1) as count
+           from records, json_each(records.artists) artist
+           group by name
+           order by count desc
+           """),
+           select: {fragment("name"), fragment("count")}
+
+    Repo.all(q)
+  end
+
+  @doc """
+  Returns a list of tuples containing genre names and their record count,
+  ordered by count in descending order.
+  """
+  def count_records_by_genre do
+    q =
+      from r in fragment("""
+           select genre.value as name, count(1) as count
+           from records, json_each(records.genres) genre
+           group by name
+           order by count desc
+           """),
+           select: {fragment("name"), fragment("count")}
+
+    Repo.all(q)
+  end
 end