Just one word: triggers.

From the Class::DBI documentation:

TRIGGERS
__PACKAGE__->add_trigger(trigger_point_name => \&code_to_execute);

# e.g.

__PACKAGE__->add_trigger(after_create  => \&call_after_create)
;

It is possible to set up triggers that will be called at various point
s
[download]

Triggers are the database way of running some extension code upon creating a record and Class::DBI tries to do it in a manner as similar as possible.