extra.db missing on multiple mirrors

[Niklas Yann Wettengel]

Hi,

I noticed the extra.db-file (/extra/os/x86_64/extra.db) is missing on multiple 
Tier 1 mirrors:

- ftp.halifax.rwth-aachen.de
- mirror.23m.com
- mirror.selfnet.de

maybe an upstream problem?

Best Regards
Niklas