It sounds like AdSense is automatically crawling your page to determine which ads to serve in future. I guess if it matters to your app, you'd probably want to

It sounds like AdSense is automatically crawling your page to determine which ads to serve in future. I guess if it matters to your app, you'd probably want to figure out the Google IP addresses and exclude them from writing to the DB. You could verify this by posting your HTTP access log. This hadn't occurred to me previously, and I couldn't find anything about it, but I don't see how else Adsense could work. I would imagine it only happens once per page, hence the need to keep changing the file name.