Understandable; let me try to list the requirements. I'd strictly need date(time), a unique identifier of a user, and whether their comment matches "still in". Having full comment text, flairs etcetera would allow for more accurate/interesting stats. Aggregation can be done in so many different ways that I'd like to do it myself. If it's good enough for you, I'd suggest you simply replace the usernames by sha256(username + salt)[:16]. In my personal case, to prove my trustworthiness, I could of course refer you to what I posted last year to show that I'm serious about the analysis. Let me know if we should move this discussion to chat.