Mentat

Extend database model for report metadata necessary for on-fly generation and calculate/save them along with the current text report. Data structure could be something akin to:

{
  class: {
    ip: {
      starttime: ...,
      endtime: ...,
      count: ...,
      proto: ...,
      ... (url, etc)
    },
    another_ip: {
       ...
    }
  }

That should be flexible enough to incorporate new metadata for IPs.

Please, also review current JSON format for statistics, to keep things more or less consistent.