It will search for all dates within the past and remove them. Afterwards
all events with no dates are searched and removed.
As DataHandler is used for deletion of events, there is already logging
within TYPO3, as well as recursive deletion for sys_file_references.
To speedup for large data sets, deletion of dates is done without
DataHandler.
Allows to remove all existing records regarding events.
It will search for all pages providing either organizer or events, and
will delete both types of records.
As DataHandler is used for deletion, there is already logging within
TYPO3, as well as recursive deletion for dates and sys_file_references.
To speedup for large data sets, truncate organizer and dates, as they
don't have recursive deletions, e.g. to sys_file_references. Also add
keys to database.
