events/README.md

Clean category relations

TRUNCATE TABLE tx_events_domain_model_event;
TRUNCATE TABLE tx_events_domain_model_date;
TRUNCATE TABLE tx_events_domain_model_organizer;
DELETE FROM sys_category_record_mm WHERE tablenames = 'tx_events_domain_model_event';
DELETE FROM sys_file_reference WHERE tablenames = 'tx_events_domain_model_event';
DELETE FROM sys_file WHERE identifier LIKE '%/events/%';
DELETE FROM sys_file_metadata WHERE alternative = 'DD Import';