/dev/null это ACID БД

https://jyu.dev/blog/why-dev-null-is-an-acid-compliant-database/

Atomicity
   Operations are "all or nothing."
Consistency
   The system transitions from one valid state to another.
Isolation
   Concurrent transactions don't interfere with each other.
Durability
   Once a transaction is committed, it remains so, even after crashes.