[v16] Move away from using email ID as username about frappe HOT 2 OPEN

I like this idea, and I'm fine with it. However, I believe it would be better to use a random ID for users (in general).

Pros: (all the usual arguments of random IDs)

• it might avoid bottlenecks in distributed setups: random id = ~guaranteed to be available
• reduce user ID contention and obsolescence: Why am I ankush12? Are there 11 other with the same name?
• don't require migration from old system: varchar -> varchar (but it could be nice)
• it might be beneficial in the case of data leaks (weak argument)

Cons:

• require front-end to make requests everytime it needs to display a user, but i believe this is already the case, and would still be the case with ankush as ID
• possibly more difficult to debug

We should consider migrating the existing IDs: old code could still work if name as email is still allowed, we want it to obviously break, in order to avoid problems down the line

from frappe.

@ankush
If there are users such as
[email protected],
[email protected], and
[email protected],
Frappe will determine which user ID to consider?

from frappe.