I solved my problem this way:
1. Install woocommerce admin again.
2. Goto the Analytics menu and stop all running imports.
3. Also delete the tables created (there is a button for that). This might not be necessary
After that I deleted all my action entries with this sql statement:
DELETE wp_actionscheduler_actions.*, wp_actionscheduler_logs.* from wp_actionscheduler_actions left JOIN wp_actionscheduler_logs ON wp_actionscheduler_actions.action_id = wp_actionscheduler_logs.action_id where wp_actionscheduler_actions.status like “complete”
After that there was silence…..
