Resolve "Statistics seem to be based only on requests created in the last hour"
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Changes the average waiting time to be calculated over the handled requests in the last hour instead of the handled requests that were also created in the last hour.
Also changes the active assistants to be calculated over the handled requests in the last hour instead of the handled requests create in the last hour.
Change the time from getCreatedAt()
to getHandledAt()
Closes #194 (closed)