You notice that syncvoltodb is not triggered automatically after some files have been marked as "Online=0". The venture.log confirms that the files are resyncing.
syncvoltodb is triggered automatically whenever someone lists the folder content and a combination of File Name, File Hash, and/or Change Time is not the same as the DB stored record. Whenever a file is listed, the DB checks integrity, and if it detects that CTime is greater than the one in the DB, it will trigger syncvoltodb.
This process is done automatically and there are no configuration settings to change it.