JDBC/HSQL logging with JSON-RPC querying?

Perhaps an extension to logging would be nice where an agent can query not just JSON-RPC events but all log4j output by means of an (Hypersonic, in-memory?) JDBC appender for log4j for which the AgentServlet provides (SQL) querying access via JSON-RPC? This way it becomes much easier to debug distributed agent applications by simply collecting the logs from each datasource