[galaxy-dev] deleting files from galaxy database/file system

Hi all, How does galaxy handle deletion of files? I mean when I delete a file from my history, it doesn't seem like it deletes it from the database directory, nor does it delete any associated "files" directories. Is it scheduled for deletion and will be deleted at some point? Is there any way to force the deletion, besides simply deleting the files directly on our server? If I did that, would that be a problem? Any help would be highly appreciated! Thanks! - Nik.