[Proftpd-user] Limit download count per file and user and period

Hi Group!

Has anybody a solution to limit downloads per file and user and time period?
That means for more than one session (as mod_quotatab do).

Details:
We are delivering asset data to a high amount of user.
Data are updated weekly, but all data stayed in the same folder.
User get report about changed data and should be able to download new files.
But we want to prevent (due to bandwith and data transfer costs),
that user downloads all data again and again for convenience.
Therefore we would like to limit downloads per file and user.
Maybe only three times a month or so.
Of course we could run external jobs to manipulate counter, which means
counter resetting must not be part of the base function.

Environment:
We are using ProFTPd 1.3.6 with a mysql databases as user and log backend

Thx in advance for your hints
    Clemens

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