fix: exchange_rate should be decimal

Signed-off-by: Miles Zhang <[email protected]>

lib/godwoken_explorer/graphql/resolovers/udt.ex

@@ -86,7 +86,7 @@ defmodule GodwokenExplorer.Graphql.Resolvers.UDT do
         if exchange_rate == 0 do
           Decimal.new(0)
         else
-          exchange_rate
+          Decimal.new(exchange_rate)
         end
 
       {:ok, %{symbol: symbol, exchange_rate: exchange_rate, timestamp: timestamp}}