Query to delete attachment (and file)

[Lincoln]

I'm trying to create a simple script that will delete all posts AND attachments in a particular thread older than a certain date, skipping the first post.

I'm pretty confident I can write the query to remove the posts fine, but what query / PHP do I need to both remove the attachment reference from the database and delete the file as well? And, on a related note, how do I figure out where my attachments are stored in the filesystem? I'm pretty sure, but I'd like to confirm.

Thanks!