Add Enum.uniq before sanitizing token transfers

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Features
 
+- [#9437](https://github.com/blockscout/blockscout/pull/9437) - Add Enum.uniq before sanitizing token transfers
 - [#9403](https://github.com/blockscout/blockscout/pull/9403) - Null round handling
 - [#9401](https://github.com/blockscout/blockscout/pull/9401) - Eliminate incorrect token transfers with empty token_ids
 - [#9396](https://github.com/blockscout/blockscout/pull/9396) - More-Minimal Proxy support

apps/indexer/lib/indexer/transform/token_transfers.ex

@@ -107,6 +107,7 @@ defmodule Indexer.Transform.TokenTransfers do
   defp sanitize_token_types(tokens, token_transfers) do
     existing_token_types_map =
       tokens
+      |> Enum.uniq()
       |> Enum.reduce([], fn %{contract_address_hash: address_hash}, acc ->
         case Repo.get_by(Token, contract_address_hash: address_hash) do
           %{type: type} -> [{address_hash, type} | acc]