Database purge old statistics

It's not a bad idea but I can't like to drop and loose data! The purged data should first be saved (in db files for example), and PhpMyVisites should still be able to retrieve it on request. Dropping for ever data can't be a good idea...

why don't compressing them instead ? you could store them without details in some kind of shorts periods like weeks or month for the very olders.

Because many servers limit the db data storage space... Old data isn't computed at every time but it's still present in database. My idea - to move very old data to files (eg. .csv/.db - for easier analysis).

How about a Round Robin Database approach? Usually nobody needs detailed data from one year ago. Simply store a simplified version of the data (aggregated data) and only present detailed stats for the last X month, days... this is not 100% RRD but close enough.