fix: Fetch contract methods decoding candidates sorted by inserted_at (#10529)

* Fetch contract methods decoding candidates sorted by inserted_at

* Add contract_methods inserted_at B-tree index

apps/explorer/lib/explorer/chain/contract_method.ex

@@ -72,6 +72,7 @@ defmodule Explorer.Chain.ContractMethod do
     from(
       contract_method in __MODULE__,
       where: contract_method.identifier == ^method_id,
+      order_by: [asc: contract_method.inserted_at],
       limit: ^limit
     )
   end

apps/explorer/priv/repo/migrations/20240806162644_add_contract_methods_inserted_at_index.exs

@@ -0,0 +1,7 @@
+defmodule Explorer.Repo.Migrations.AddContractMethodsInsertedAtIndex do
+  use Ecto.Migration
+
+  def change do
+    create(index(:contract_methods, [:inserted_at]))
+  end
+end