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Description
Inspired by https://www.tinkerunity.org/topic/7778-feature-request-z%C3%A4hler-dashboard/#comment-41977
- Charges over the last week/month/year
- Charges per user (top 5-ish)
We don't want to transmit the complete charge log every time a user visits the web interface. So the stats have to be calculated on start-up and updated every time a charge stop is tracked.