Metrics for Statistics precalculated once per day

[Lietze]

Metrics for Statistics precalculated once per day

As a User I want the metrics for the statistics to be calculated once a day in order to wait less time when looking for the lastet Statistics. If they are beeing calculated on demand all logs have to be evaluated each time.

Dependencies

Depends on:

• Model for statistics #138

Acceptance Criteria

• Metrics for each Item are calculated once per day
• Metrics for each Item are then saved
  • How often the item has been lend
  • Time the Item has been lend
  • Time spent on waitlist until could be lend
  • How many people waited until it could be lend
  • Lifetime of the item
• Calculation of current Statistics use these metrics instead of all the logs