
Q: cdb or single files?

A: 
  cdb:
    - ugly keys
    - potentially many
    - quick, cheap lookups
  single files:
    - volatile
    - direct visibility
    - single or very few

e.g.
  cdb:
    - ip bans
    - block (peer)
    - notify
    - subscribed
  single files:
    - queued jobs
    - incoming (subscribed to) posts
