fix for battery health dashboard erroring out if no charge data has been collected so far

grafana/dashboards/battery-health.json

@@ -1913,7 +1913,7 @@
         "includeAll": false,
         "name": "aux",
         "options": [],
-        "query": "WITH Aux AS\n(\n\t\tSELECT \n    car_id,\n\t\tCOALESCE(efficiency, \n\t\t(SELECT efficiency\n\t\t\tFROM cars WHERE id = $car_id) * 100) AS efficiency\n\tFROM (\n\t\tSELECT ROUND((charge_energy_added / NULLIF(end_rated_range_km - start_rated_range_km, 0))::numeric, 3) * 100 as efficiency,\n\t\t\tCOUNT(*) as count, $car_id AS car_id \n\t\tFROM charging_processes\n\t\tWHERE car_id = $car_id\n\t\t\tAND duration_min > 10\n\t\t\tAND end_battery_level <= 95\n\t\t\tAND start_rated_range_km IS NOT NULL\n\t\t\tAND end_rated_range_km IS NOT NULL\n\t\t\tAND charge_energy_added > 0\n\t\tGROUP BY 1\n\t\tORDER BY 2 DESC\n\t\tLIMIT 1\n\t) AS DerivatedEfficiency\n),\nCurrentCapacity\t AS\n(\n\tSELECT AVG(Capacity) AS Capacity\nFROM (\nSELECT \n\tc.rated_battery_range_km * aux.efficiency / c.usable_battery_level AS Capacity\n\tFROM charging_processes cp\n\t\tINNER JOIN charges c\n\t\tON c.charging_process_id = cp.id \n                INNER JOIN aux ON cp.car_id = aux.car_id\n\tWHERE cp.car_id = $car_id\n\t\tAND cp.end_date IS NOT NULL\n\t\tAND cp.charge_energy_added >= aux.efficiency\n\t\tAND c.usable_battery_level > 0\n\t ORDER BY cp.end_date DESC LIMIT 10) AS lastCharges\n), \nMaxCapacity AS\n(\n\tSELECT \n\t\tMAX(c.rated_battery_range_km * aux.efficiency / c.usable_battery_level) AS Capacity\n\tFROM charging_processes cp\n\t\tINNER JOIN (\n\t\t\tSELECT charging_process_id, MAX(date) as date FROM charges WHERE usable_battery_level > 0 GROUP BY charging_process_id) AS gcharges\t\n\t\t\tON cp.id = gcharges.charging_process_id\n\t\tINNER JOIN charges c\n\t\tON c.charging_process_id = cp.id AND c.date = gcharges.date\n\t\tINNER JOIN aux ON cp.car_id = aux.car_id\n\tWHERE cp.car_id = $car_id\n\t\tAND cp.end_date IS NOT NULL\n\t\tAND cp.charge_energy_added >= aux.efficiency\n), \nCurrentRange AS\n(\n    SELECT (range * 100.0 / usable_battery_level) AS range\n\tFROM (\n\t\t(SELECT date, ${preferred_range}_battery_range_km AS range, usable_battery_level AS usable_battery_level\n\t\t\tFROM positions\tWHERE car_id = $car_id AND ideal_battery_range_km IS NOT NULL AND usable_battery_level > 0  ORDER BY date DESC LIMIT 1)\n\t\tUNION ALL\n\t\t(SELECT date, ${preferred_range}_battery_range_km AS range, usable_battery_level as usable_battery_level\n\t\t\tFROM charges c JOIN charging_processes p ON p.id = c.charging_process_id\n\t\t\tWHERE p.car_id = $car_id AND usable_battery_level > 0 ORDER BY date DESC LIMIT 1)\n\t) AS data\n\tORDER BY date DESC\n\tLIMIT 1\n), \nMaxRange AS\n(\n    SELECT\n\t\tfloor(extract(epoch from date)/86400)*86400 AS time,\n\t    CASE WHEN sum(usable_battery_level) = 0 THEN sum(${preferred_range}_battery_range_km) * 100\n\t\t     ELSE sum(${preferred_range}_battery_range_km) / sum(usable_battery_level) * 100\n\tEND AS range\n    FROM (\n\t\tSELECT battery_level, usable_battery_level, date,  ${preferred_range}_battery_range_km from charges c \n\t\tJOIN charging_processes p ON p.id = c.charging_process_id \n\t\tWHERE p.car_id = $car_id AND usable_battery_level IS NOT NULL) AS data\n\tGROUP BY 1\n\tORDER BY 2 DESC\n\tLIMIT 1\n) \nSELECT\n  json_build_object(\n    'MaxRange', convert_km(MaxRange.range,'$length_unit'),\n    'CurrentRange', convert_km(CurrentRange.range,'$length_unit'),\n    'MaxCapacity', MaxCapacity.Capacity,\n    'CurrentCapacity', CASE WHEN CurrentCapacity.Capacity IS NULL THEN 1 ELSE CurrentCapacity.Capacity END,\n    'RatedEfficiency', aux.efficiency\n  )\nFROM MaxRange, CurrentRange, Aux, MaxCapacity, CurrentCapacity",
+        "query": "WITH Aux AS\n(\n\t\tSELECT \n    car_id,\n\t\tCOALESCE(efficiency, \n\t\t(SELECT efficiency\n\t\t\tFROM cars WHERE id = $car_id) * 100) AS efficiency\n\tFROM (\n\t\tSELECT ROUND((charge_energy_added / NULLIF(end_rated_range_km - start_rated_range_km, 0))::numeric, 3) * 100 as efficiency,\n\t\t\tCOUNT(*) as count, $car_id AS car_id \n\t\tFROM charging_processes\n\t\tWHERE car_id = $car_id\n\t\t\tAND duration_min > 10\n\t\t\tAND end_battery_level <= 95\n\t\t\tAND start_rated_range_km IS NOT NULL\n\t\t\tAND end_rated_range_km IS NOT NULL\n\t\t\tAND charge_energy_added > 0\n\t\tGROUP BY 1\n\t\tORDER BY 2 DESC\n\t\tLIMIT 1\n\t) AS DerivatedEfficiency\n),\nCurrentCapacity\t AS\n(\n\tSELECT AVG(Capacity) AS Capacity\nFROM (\nSELECT \n\tc.rated_battery_range_km * aux.efficiency / c.usable_battery_level AS Capacity\n\tFROM charging_processes cp\n\t\tINNER JOIN charges c\n\t\tON c.charging_process_id = cp.id \n                INNER JOIN aux ON cp.car_id = aux.car_id\n\tWHERE cp.car_id = $car_id\n\t\tAND cp.end_date IS NOT NULL\n\t\tAND cp.charge_energy_added >= aux.efficiency\n\t\tAND c.usable_battery_level > 0\n\t ORDER BY cp.end_date DESC LIMIT 10) AS lastCharges\n), \nMaxCapacity AS\n(\n\tSELECT \n\t\tMAX(c.rated_battery_range_km * aux.efficiency / c.usable_battery_level) AS Capacity\n\tFROM charging_processes cp\n\t\tINNER JOIN (\n\t\t\tSELECT charging_process_id, MAX(date) as date FROM charges WHERE usable_battery_level > 0 GROUP BY charging_process_id) AS gcharges\t\n\t\t\tON cp.id = gcharges.charging_process_id\n\t\tINNER JOIN charges c\n\t\tON c.charging_process_id = cp.id AND c.date = gcharges.date\n\t\tINNER JOIN aux ON cp.car_id = aux.car_id\n\tWHERE cp.car_id = $car_id\n\t\tAND cp.end_date IS NOT NULL\n\t\tAND cp.charge_energy_added >= aux.efficiency\n), \nCurrentRange AS\n(\n    SELECT (range * 100.0 / usable_battery_level) AS range\n\tFROM (\n\t\t(SELECT date, ${preferred_range}_battery_range_km AS range, usable_battery_level AS usable_battery_level\n\t\t\tFROM positions\tWHERE car_id = $car_id AND ideal_battery_range_km IS NOT NULL AND usable_battery_level > 0  ORDER BY date DESC LIMIT 1)\n\t\tUNION ALL\n\t\t(SELECT date, ${preferred_range}_battery_range_km AS range, usable_battery_level as usable_battery_level\n\t\t\tFROM charges c JOIN charging_processes p ON p.id = c.charging_process_id\n\t\t\tWHERE p.car_id = $car_id AND usable_battery_level > 0 ORDER BY date DESC LIMIT 1)\n\t) AS data\n\tORDER BY date DESC\n\tLIMIT 1\n), \nMaxRange AS\n(\n    SELECT\n\t\tfloor(extract(epoch from date)/86400)*86400 AS time,\n\t    CASE WHEN sum(usable_battery_level) = 0 THEN sum(${preferred_range}_battery_range_km) * 100\n\t\t     ELSE sum(${preferred_range}_battery_range_km) / sum(usable_battery_level) * 100\n\tEND AS range\n    FROM (\n\t\tSELECT battery_level, usable_battery_level, date,  ${preferred_range}_battery_range_km from charges c \n\t\tJOIN charging_processes p ON p.id = c.charging_process_id \n\t\tWHERE p.car_id = $car_id AND usable_battery_level IS NOT NULL) AS data\n\tGROUP BY 1\n\tORDER BY 2 DESC\n\tLIMIT 1\n),\nBase as (\n\tselect null\n)\nSELECT\n  json_build_object(\n    'MaxRange', convert_km(MaxRange.range,'$length_unit'),\n    'CurrentRange', convert_km(CurrentRange.range,'$length_unit'),\n    'MaxCapacity', MaxCapacity.Capacity,\n    'CurrentCapacity', CASE WHEN CurrentCapacity.Capacity IS NULL THEN 1 ELSE CurrentCapacity.Capacity END,\n    'RatedEfficiency', aux.efficiency\n  )\nFROM Base, MaxRange, CurrentRange, Aux, MaxCapacity, CurrentCapacity",
         "refresh": 1,
         "regex": "",
         "type": "query"