diff --git a/priv/repo/migrations/20250920065259_add_assets_content_size_index.exs b/priv/repo/migrations/20250920065259_add_assets_content_size_index.exs
new file mode 100644
index 00000000..5ff490fb
--- /dev/null
+++ b/priv/repo/migrations/20250920065259_add_assets_content_size_index.exs
@@ -0,0 +1,15 @@
+defmodule MusicLibrary.Repo.Migrations.AddAssetsContentSizeIndex do
+  use Ecto.Migration
+
+  def up do
+    execute """
+    CREATE index assets_content_size_index on assets(length(content));
+    """
+  end
+
+  def down do
+    execute """
+    DROP index assets_content_size_index;
+    """
+  end
+end