[db-wg] Overly specific inet6num objects by Hetzner

Hetzner apparently creates an `inet6num` object per dedicated server allocation (enough to get my IP blocked for 1 day trying to query them all), and it took several seconds to execute the query.

whois -r -- "-i mnt-by HOS-GUN -T inet6num" (warning: this will get your IP blocked)

Some questions: 1. Is there any policy about "too specific" objects? 2. Is there any plans to restrict how many objects a single query can get at once?