JWT and OAuth for multiple devices?

Question

OAuth

I can roughly imagine how JWT and OAuth work separately. But how to combine them and at the same time leave the ability to work with multiple devices? I see it like this
1. The client generates an ID for the device. **DeviceId**
2. Sends **DeviceId**, **Login**, **Password** to server
3. Server generates **AccessToken**, **RefreshToken** and saves in conjunction with **DeviceId ** to distinguish between sessions on different devices.
Here are the questions:
1. What are random hash tokens in this case, or is it a JWT with some kind of paylaod inside.
2. Do I need to save **AccessToken** to the database? Or it stores a JWT with an authorized user, and only **RefreshToken** is stored
3. What about a token compromise on one of the devices? When using **RefreshToken**, the attacker will log out the user only on this device, or will there be only one **RefreshToken** for the user, and after the **AccessToken** on one of the devices expires and a new pair is generated, all devices will be logged out?
How is this generally done in the mind, who has experience in implementing it?