store totems in a database instead of YAML

[tprk77]

Totems are currently stored in a big YAML file. Every time a totem is built or broken, this flat file needs to be updated. There are also issues with "invalid" totems being deleted from the file; unexpected errors can cause legitimate totems to be deleted from the file, leaving the user stranded. Totems should only be deleted when a totem break occurs, invalid totems should just be ignored.