Move o Delte all event in Zenoss 4.2.5

Hi folks, I have instaled zenoss 4.2.5, I load all devices and I have a lot of events, so, I want to delete all events ( move events to history) and the User interface doesn't work, then, I use a simple script ( python script that use zenoss api) and it doesn't work either. I tray to truncata the table event_summury using  myslq but I can't

Cannot truncate a table referenced in a foreign key constraint (`zenoss_zep`.`event_trigger_signal_spool`, CONSTRAINT `fk_event_summary_uuid` FOREIGN KEY (`event_summary_uuid`) REFERENCES `zenoss_zep`.`event_summary` (`uuid`))

Any idea what I can do?

Thanks you!