You can use a "cron task" to automatically rubberstamp requests that are older than 24 hours. On Unix/Linux systems, you can literally use the "cron" utility to run the mysql command-line processor and have it execute a SQL command. Windows also has a scheduler, although theirs is a little harder for most people to figure out.
Or, you can run an internal webapp process to do the same time, executing a
JDBC request from Java Code. For something simple like this, you can just spawn a
thread from an application contextListener to use the java Timer class. For more complex scheduling, a powerful alternative is the Quartz Scheduler.