v0.9.4 bugs fixes

backend/src/routes/push.js

@@ -70,12 +70,10 @@ router.post('/subscribe', authMiddleware, (req, res) => {
     return res.status(400).json({ error: 'Invalid subscription' });
   }
   const db = getDb();
-  // Use DELETE+INSERT to avoid relying on any specific UNIQUE constraint
-  // (existing DBs may have different schemas for this table)
-  const delStmt = db.prepare('DELETE FROM push_subscriptions WHERE endpoint = ?');
-  const insStmt = db.prepare('INSERT INTO push_subscriptions (user_id, endpoint, p256dh, auth) VALUES (?, ?, ?, ?)');
-  delStmt.run(endpoint);
-  insStmt.run(req.user.id, endpoint, keys.p256dh, keys.auth);
+  const device = req.device || 'desktop';
+  // Delete any existing subscription for this user+device or this endpoint, then insert fresh
+  db.prepare('DELETE FROM push_subscriptions WHERE endpoint = ? OR (user_id = ? AND device = ?)').run(endpoint, req.user.id, device);
+  db.prepare('INSERT INTO push_subscriptions (user_id, device, endpoint, p256dh, auth) VALUES (?, ?, ?, ?, ?)').run(req.user.id, device, endpoint, keys.p256dh, keys.auth);
   res.json({ success: true });
 });