[RFE] improving statistics section

[ptrnull]

As a user I would like to have a better statistics section where I can see the evolution of certain metrics like cases per account, product, case age, prio-list cases. Where I can see these metrics in a daily, weekly or a monthly timeframe. To compare how a metric is developing against a base line (f.ex: average for the last X actual period of time).
To implement this enhancement it is required to have a persistence SQL based layer.