Daily, weekly, monthly reports

• depends on clean service max age setting until #10 is resolved
• one routine for arbitrary interval (day, week, month)
• include:
  • resolved dicrepancies
  • unresolved discreapncies
  • uptimes (#25 (closed))
  • min/max/avg of system health (#21 (closed))
  • version of status site / available updates
  • URLs to main landing page, blog, instance itself, docs