schedules bug fix

backend/src/routes/schedule.js

@@ -377,9 +377,9 @@ router.delete('/:id', authMiddleware, async (req, res) => {
           AND title=$2 AND start_at >= $3
       `, [event.created_by, event.title, event.start_at]);
     } else if (recurringScope === 'all' && event.recurrence_rule) {
-      // Delete every occurrence
+      // Delete present and future occurrences only — preserve past records
       await exec(req.schema, `
-        DELETE FROM events WHERE created_by=$1 AND recurrence_rule IS NOT NULL AND title=$2
+        DELETE FROM events WHERE created_by=$1 AND recurrence_rule IS NOT NULL AND title=$2 AND end_at >= NOW()
       `, [event.created_by, event.title]);
     } else {
       await exec(req.schema, 'DELETE FROM events WHERE id=$1', [req.params.id]);