Yep this sounds more like a database design issue, not a perl issue. If I was to design such a feature, I would create a user access log table somewhat like this:

Table: access_log
seq_no	Sequence Number
uid	User ID
access_time	Timestamp
report_id	Report ID
report_option	Report Option

Then it's just a simple matter of constructing your SQL queries to make use of the access log.

By the way, you are using a database backend, aren't you?

(I missed the sequence id in my post earlier, here's the amendment, thanks! And of cause this is to assume the traffic volume is relatively small.)

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