What should I do? call the police? the insurance company? Now or tomorrow morning?
Tomorrow will be fine. After you've reported it to the police, call thte insurance. You can probably do report it online as well. Bicycle theft is quite common.
Depends on the price of the bike. Remeber, you have the "Selbstbehalt". So if the bike was cheap, it may not be worth the hassle.
The bike was a CUBE 240 with hydraulic disc brakes. It's around 600CHF ( so not sure if is cheap or not for the insurance). The problem is that you can't find these bikes in stock anymore. That's probably why it was stolen. Next to it, 2 more adult bikes were chained and the next door neighbors have the bikes just leaning on the rack, not tied.
now have a very sad child who has declared himself the unluckiest kid in the world
It's a horrible thing to happen and worse for a child - sorry this happened to you.
For the unluckiest kid in the world: I’ve found several Cube 240s in stock. Maybe not the same model, but:
https://www.bike-discount.de/de/cube…esert-n-orange
https://www.veloplus.ch/shop/velos-a…o-33006396.001
There are several on tutti.ch (your kid’s bike may turn up there…)
If you go to https://www.cube.eu/dealer-search/ you can look for dealers. There may be a bike in stock somewhere, could be worth phoning around (or checking online, if they have well maintained websites).