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apps/lol_analytics/priv/repo/migrations/20240613200312_item_metadata.exs

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+defmodule LoLAnalytics.Repo.Migrations.ItemMetadata do
+  use Ecto.Migration
+
+  def change do
+    alter table("dim_item") do
+      add :metadata, :map
+    end
+  end
+end

apps/lol_analytics/priv/repo/migrations/20240613212421_item_metadata_index.exs

@@ -0,0 +1,11 @@
+defmodule LoLAnalytics.Repo.Migrations.ItemMetadataIndex do
+  use Ecto.Migration
+
+  def up do
+    execute("CREATE INDEX dim_item_metadata ON dim_item USING GIN(metadata)")
+  end
+
+  def down do
+    execute("DROP INDEX dim_item_metadata")
+  end
+end