Create recommended index on tx table.

apps/block_scout_web/lib/block_scout_web/views/transaction_view.ex

@@ -505,7 +505,9 @@ defmodule BlockScoutWeb.TransactionView do
     token = Transaction.get_fee_token_name(transaction)
 
     case token do
-      {:ok, address} -> address
+      {:ok, address} ->
+        address
+
       {:error, :not_found} ->
         Logger.info("Found unknown gas token at #{inspect(gch)}")
         ChainToken.set_uncatalogued_token(transaction)

apps/explorer/lib/explorer/chain/import/runner/address/token_balances.ex

@@ -95,7 +95,7 @@ defmodule Explorer.Chain.Import.Runner.Address.TokenBalances do
             {:unsafe_fragment, ~s<(address_hash, token_contract_address_hash, COALESCE(token_id, -1), block_number)>},
           on_conflict: on_conflict,
           for: TokenBalance,
-          returning: false
+          returning: false,
           timeout: timeout,
           timestamps: timestamps
         )

apps/explorer/lib/explorer/chain/token.ex

@@ -143,6 +143,7 @@ defmodule Explorer.Chain.Token do
   end
 
   def set_uncatalogued_token(%{gas_currency_hash: nil}), do: :ok
+
   def set_uncatalogued_token(%{gas_currency_hash: address}) do
     %Token{}
     |> changeset(%{contract_address_hash: address, type: "ERC-20"})

apps/explorer/priv/repo/migrations/20240207100347_recommended_tx_index.exs

@@ -0,0 +1,17 @@
+defmodule Explorer.Repo.Local.Migrations.RecommendedTxIndex do
+  use Ecto.Migration
+
+  def change do
+    create_if_not_exists(
+      index(
+        :transactions,
+        [
+          :block_hash,
+          :hash
+        ],
+        name: "transactions_block_hash_hash",
+        concurrently: true
+      )
+    )
+  end
+end