# Mutable State Only

> Keeping only mutable current state with no event record, so past states and changes cannot be recovered.

Record: `lexicon:mutable-state-only`
Kind: anti-pattern
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-mutable-state-only

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Irreversible Side Effects](https://banes-lab.com/records/lexicon/irreversible-side-effects.md) and before [Point-to-Point Coupling](https://banes-lab.com/records/lexicon/point-to-point-coupling.md).

## Category

- [Event Messaging Async](https://banes-lab.com/records/lexicon-category/event-messaging-async.md)

## Negated by

- [Event Stream](https://banes-lab.com/records/architecture/event-stream.md)

## Linked from

- [Event / Messaging / Asynchronous Architecture](https://banes-lab.com/ontology/principles/architecture-category-event-messaging-asynchronous-architecture.md)