Is it possible to somehow set up @Wallet of Satoshi as a watch only wallet? The idea would be to set it up on a device as a point of sale, from which it was only possible to create invoices and receive payments, but not sending out money for employees to use, while having the same account fully operational on a different device for the employer to use the funds.

In the @npub1tr0v...qqpx episode with @Kwinten, they mentioned an opensource calendar software, but I couldn't understand its name. I'd appreciate any help or pointers to it, please? :-)