Update charging-stats.json (#642)

* Update charging-stats.json

Updated to address #528

Added case statement to adjust to show kWh at non decimal level and MWh at the 3 decimal point level. Cannot address directly within grafana so used case statement. Removed grafana sorting so can be sorted properly in SQL since not a direct # now for grafana to sort.

* Update charging-stats.json

Fixed mWh to MWh

Fixes #528

grafana/dashboards/charging-stats.json

@@ -1155,8 +1155,8 @@
       "scroll": true,
       "showHeader": true,
       "sort": {
-        "col": 1,
-        "desc": true
+        "col": null,
+        "desc": false
       },
       "styles": [
         {
@@ -1198,7 +1198,7 @@
           "mappingType": 1,
           "pattern": "charge_energy_added",
           "thresholds": [],
-          "type": "number",
+          "type": "string",
           "unit": "kwatth"
         }
       ],
@@ -1208,7 +1208,7 @@
           "group": [],
           "metricColumn": "none",
           "rawQuery": true,
-          "rawSql": "SELECT\n\tCOALESCE(geofence.name, CONCAT_WS(', ', COALESCE(address.name, nullif(CONCAT_WS(' ', address.road, address.house_number), '')), address.city)) AS location,\n\tsum(charge_energy_added) as charge_energy_added\nFROM\n\tcharging_processes c\nLEFT JOIN addresses address ON c.address_id = address.id\nLEFT JOIN geofences geofence ON geofence_id = geofence.id\nWHERE\n\t$__timeFilter(end_date)\n\tAND car_id = $car_id\nGROUP BY\n\t1\nORDER BY\n\tcharge_energy_added DESC\nLIMIT 15;",
+          "rawSql": "SELECT\n\tCOALESCE(geofence.name, CONCAT_WS(', ', COALESCE(address.name, nullif(CONCAT_WS(' ', address.road, address.house_number), '')), address.city)) AS location,\n\tCASE\n      WHEN SUM(charge_energy_added) BETWEEN 0 AND 999.999 THEN SUM(charge_energy_added)::NUMERIC(4,0)::VARCHAR || ' kWh' \n      WHEN SUM(charge_energy_added) BETWEEN 1000 AND 999999.999 THEN (SUM(charge_energy_added) / 1000)::NUMERIC(9, 3)::VARCHAR || ' MWh' \n      WHEN SUM(charge_energy_added) >= 1000000 THEN (SUM(charge_energy_added) / 1000)::NUMERIC(9, 3)::VARCHAR || ' gWh' \n   END as charge_energy_added\nFROM\n\tcharging_processes c\nLEFT JOIN addresses address ON c.address_id = address.id\nLEFT JOIN geofences geofence ON geofence_id = geofence.id\nWHERE\n\t$__timeFilter(end_date)\n\tAND car_id = $car_id\nGROUP BY\n\t1\nORDER BY\n\tSUM(charge_energy_added) DESC\nLIMIT 15;",
           "refId": "A",
           "select": [
             [