Version 1 embeds a timestamp and the machine MAC address, which leaks information and is rarely what people actually want.

Generate UUIDs

Version 4 UUIDs, one or five hundred, generated by your browser.

How manyHyphensUppercase

0 UUIDs

Version 4, generated by your browser with crypto.randomUUID. 122 of the 128 bits are random, which is enough that you will not see a collision.

Questions

Are these safe to use as database keys?: Yes.
Are they generated on a server?: No.
Why no version 1?: Version 1 embeds a timestamp and the machine MAC address, which leaks information and is rarely what people actually want.