Add transaction hash to address indexes for transaction and token_transfer tables to optimize count query

apps/explorer/priv/repo/migrations/20180117221923_create_transactions.exs

@@ -182,9 +182,9 @@ defmodule Explorer.Repo.Migrations.CreateTransactions do
     )
 
     create(index(:transactions, :block_hash))
-    create(index(:transactions, :from_address_hash))
-    create(index(:transactions, :to_address_hash))
-    create(index(:transactions, :created_contract_address_hash))
+    create(index(:transactions, [:from_address_hash, :hash]))
+    create(index(:transactions, [:to_address_hash, :hash]))
+    create(index(:transactions, [:created_contract_address_hash, :hash]))
 
     create(index(:transactions, :inserted_at))
     create(index(:transactions, :updated_at))

apps/explorer/priv/repo/migrations/20180606135150_create_token_transfers.exs

@@ -23,9 +23,9 @@ defmodule Explorer.Repo.Migrations.CreateTokenTransfers do
     end
 
     create(index(:token_transfers, :transaction_hash))
-    create(index(:token_transfers, :to_address_hash))
-    create(index(:token_transfers, :from_address_hash))
-    create(index(:token_transfers, :token_contract_address_hash))
+    create(index(:token_transfers, [:to_address_hash, :transaction_hash]))
+    create(index(:token_transfers, [:from_address_hash, :transaction_hash]))
+    create(index(:token_transfers, [:token_contract_address_hash, :transaction_hash]))
 
     create(unique_index(:token_transfers, [:transaction_hash, :log_index]))
   end