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With this change, "usage" and "cost" for export meters & tariffs are stored as negative values, which makes the default Grafana dashboard show correct "net" figures (e.g. 10 kWh import @ 10p/kWh and 5 kWh export @ 5p/kWh is shown as 5 kWh "total electricity used" and 75p "total cost" (assuming no standing charge in this example).