Can I truncate the db table event_repeat_calendar_map?

A comedy of errors - all errors mine.

I did an upgrade and some other things. Next thing I know I am getting a warning message that the site had exceeded the server limit, which is huge. The problem was the database tables. Several of them were extremely bloated considering the normal usage.

Discovered my cron file wasn't running and was needed to clean up several of the tables. I did truncate the cache tables and watchdog via phpMyAdmin. `event_repeat_calendar_map` is also very large. Is it safe to truncate that table? Would it effect a reference to nodes on any other tables?

mySQL
Drupal 5.x