Exercise: A Unique Random Access Code

[ylorph]

You must assign a unique access code in a (pseudo) random fashion.
The range of access code at your disposal is [1 000 000, 1 999 999]
The access code will be used to give you access to the system at a certain day
Once an access code is used , it can not be reused for 6 months.
An assigned access code, giving access in the future, may be revoked at any time.
It is foreseen that up to 1 000 access codes will be used per day.

Solve this in an Event Sourced fashion.
Bonus point if the assignment of the access code does not suffer from Eventual Consistency

[johnbywater]

https://github.com/johnbywater/es-example-random-access-codes