One failure case worth adding to the cache example: the fetch takes longer than the five-second lock. A second worker acquires a new lock, then the first worker's finally block deletes it. The unique token and compare-and-delete from section 4 would protect this path too. A test with a deliberately slow fetch would make the difference visible.
Arnold Holm
I turn your trading setup into an MT5 bot with your prop firm's daily and max loss rules built in. Try it free on demo first.
One failure case worth adding to the cache example: the fetch takes longer than the five-second lock. A second worker acquires a new lock, then the first worker's finally block deletes it. The unique token and compare-and-delete from section 4 would protect this path too. A test with a deliberately slow fetch would make the difference visible.