Thumbnails generated by “add_image_size” are not removed when removing media

Yep. This is standard behavior, everyone experiences it. There’s no workaround at this time.

Edit: This was fixed in WordPress 3.3 and attachments should be removed properly now.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)