Update server.js

server.js

@@ -141,16 +141,29 @@ app.get('/api/schedules', async (req, res) => {
 });
 
 app.post('/api/schedules', async (req, res) => { 
-    const filter = { className:req.body.className, dayOfWeek:req.body.dayOfWeek, period:req.body.period, weekType: req.body.weekType || 'ALL' }; 
-    const sId = req.headers['x-school-id']; 
-    if(sId) filter.schoolId = sId; 
-    await ScheduleModel.findOneAndUpdate(filter, injectSchoolId(req, req.body), {upsert:true}); 
-    res.json({}); 
+    try {
+        // FIX: Removed weekType from filter to prevent Duplicate Key Error on existing unique index.
+        // The DB index is (schoolId, className, dayOfWeek, period).
+        // This means we can only have one schedule per slot. Updating weekType should update the existing slot.
+        const filter = { className:req.body.className, dayOfWeek:req.body.dayOfWeek, period:req.body.period }; 
+        const sId = req.headers['x-school-id']; 
+        if(sId) filter.schoolId = sId; 
+        
+        await ScheduleModel.findOneAndUpdate(filter, injectSchoolId(req, req.body), {upsert:true}); 
+        res.json({}); 
+    } catch (e) {
+        console.error("Save schedule error:", e);
+        res.status(500).json({ error: e.message });
+    }
 });
 
 app.delete('/api/schedules', async (req, res) => { 
-    await ScheduleModel.deleteOne({...getQueryFilter(req), ...req.query}); 
-    res.json({}); 
+    try {
+        await ScheduleModel.deleteOne({...getQueryFilter(req), ...req.query}); 
+        res.json({}); 
+    } catch (e) {
+        res.status(500).json({ error: e.message });
+    }
 });
 
 // --- USER MENU ORDER ---