Apache::TimedRedirect is a mod_perl TransHandlermodule that allows the configuration of a timed redirect. In other words, if a user enters a web site and the URI matches a regex and it is within a certain time period she will be redirected somewhere else.
This was first created to politely redirect visitors away from database-driven sections of a web site while the databases were being refreshed.
Available from CPAN. See the module manpage for more information.