Retrieve the top profitable wallets on Pumpfun and Pumpswap for the last 30 days.
This function queries Dune Analytics (query ID: 4032586) to fetch a ranked list of wallets
based on their realized profit over the past 30 days, formatted as a tabulated string.
Args:
limit (int, optional): Maximum number of wallets to return. Defaults to 100.
Returns:
str: A tabulated string containing the rank, wallet address, realized profit (in USD),
and last transaction timestamp for each wallet, or an empty string if the query fails.
Raises:
Exception: If the API request or data retrieval encounters an error.