[mikechops]

The hands are imported into the database immediately they are played. So long as you either save the database or shutdown properly, that stats generated will be saved even if the table is closed.

What isn't saved is the actual hand history itself. The FT client deletes the hand history when the table is closed. There is an option to move the observed files to the arhive directory. This saves a copy of the file to the archive each time RT detects new data has been written (i.e. a hand is completed). I'd recommend you use that option if you are doing a lot of datamining.