Enhance extended forecast parsing and error handling

- Add module for expired period filtering
- Switch from json() to safeJson() for centralized error handling
- Improve nighttime period handling to focus on full days
- Fix day/night temperature pairing logic
- Add debug logging

server/scripts/modules/utils/forecast-utils.mjs

@@ -0,0 +1,30 @@
+// shared utility functions for forecast processing
+
+/**
+ * Filter out expired periods from forecast data
+ * @param {Array} periods - Array of forecast periods
+ * @param {string} forecastUrl - URL used for logging (optional)
+ * @returns {Array} - Array of active (non-expired) periods
+ */
+const filterExpiredPeriods = (periods, forecastUrl = '') => {
+	const now = new Date();
+
+	const { activePeriods, removedPeriods } = periods.reduce((acc, period) => {
+		const endTime = new Date(period.endTime);
+		if (endTime > now) {
+			acc.activePeriods.push(period);
+		} else {
+			acc.removedPeriods.push(period);
+		}
+		return acc;
+	}, { activePeriods: [], removedPeriods: [] });
+
+	if (removedPeriods.length > 0) {
+		const source = forecastUrl ? ` from ${forecastUrl}` : '';
+		console.log(`🚮 Forecast: Removed expired periods${source}: ${removedPeriods.map((p) => `${p.name} (ended ${p.endTime})`).join(', ')}`);
+	}
+
+	return activePeriods;
+};
+
+export default filterExpiredPeriods;