Fixed battery charge cycle undo handling (fixes #1800)

migrations/0172.sql

@@ -0,0 +1,17 @@
+DROP VIEW batteries_current;
+CREATE VIEW batteries_current
+AS
+SELECT
+	b.id, -- Dummy, LessQL needs an id column
+	b.id AS battery_id,
+	MAX(l.tracked_time) AS last_tracked_time,
+	CASE WHEN b.charge_interval_days = 0
+		THEN '2999-12-31 23:59:59'
+		ELSE datetime(MAX(l.tracked_time), '+' || CAST(b.charge_interval_days AS TEXT) || ' day')
+	END AS next_estimated_charge_time
+FROM batteries b
+LEFT JOIN battery_charge_cycles l
+	ON b.id = l.battery_id
+	AND l.undone = 0
+WHERE b.active = 1
+GROUP BY b.id, b.charge_interval_days;