feat: add soft delete for classes with cascade to sessions and linked records

jobs/classReminderJob.js

@@ -38,8 +38,9 @@ const runClassReminderJob = async () => {
       status: 'scheduled',
       reminderSentAt: null,
       day: { $gte: dayFrom, $lte: dayTo },
+      isDeleted: { $ne: true }
     })
-      .populate({ path: 'class', select: 'name students startDate days startTime endTime uniqueCode' })
+      .populate({ path: 'class', select: 'name students startDate days startTime endTime uniqueCode isDeleted' })
       .populate({ path: 'course', select: 'title' })
       .lean();
 
@@ -48,6 +49,7 @@ const runClassReminderJob = async () => {
       if (!startAt || startAt < windowStart || startAt > windowEnd) continue;
 
       const classDoc = session.class;
+      if (!classDoc || classDoc.isDeleted) continue;
       const studentIds = classDoc?.students || [];
       if (studentIds.length === 0) {
         await Session.updateOne({ _id: session._id }, { reminderSentAt: new Date() });
@@ -58,7 +60,7 @@ const runClassReminderJob = async () => {
       const timeLabel = session.startTime;
       const placeLabel = session.place || '-';
       const classSessions = classDoc?._id
-        ? await Session.find({ class: classDoc._id }).select('day startTime endTime').sort({ day: 1 }).lean()
+        ? await Session.find({ class: classDoc._id, isDeleted: { $ne: true } }).select('day startTime endTime').sort({ day: 1 }).lean()
         : [];
       const schedule = buildClassScheduleContext(classDoc, classSessions, session);