> ## Documentation Index
> Fetch the complete documentation index at: https://ddd-cqrs-es.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# PRD

# Product Requirements

This repository implements the first production skeleton of the Rust DDD CQRS
Event Sourcing framework described in the source PRD.

Implemented in this version:

* Typed aggregate API with ID, command, event, and domain error types.
* Event envelopes with event ID, aggregate type, stream revision, global sequence, event type, version, metadata, and recorded time.
* Metadata for correlation, causation, actor, tenant, request, and custom headers.
* Expected revision and first-class concurrency errors.
* Repository orchestration for load, replay, command execution, append, and updated state return.
* Thread-safe in-memory event store with stream ordering, optimistic concurrency, global ordering, global reads, and clear support.
* Projection trait and in-memory checkpointed projection runner.
* Process manager abstraction for event-to-command policies.
* Snapshot model and snapshot store trait.
* Aggregate fixture for unit testing domain behavior without storage.
* Stable event type/version metadata through `DomainEvent`.
* Feature-gated async traits and async repository.
* Feature-gated serde/JSON envelope round trips.
* UUID-backed event IDs when the `uuid` feature is enabled.
* Event upcaster trait.
* Idempotency key and in-memory idempotency store.
* Snapshot-aware repository loading and execution.
* Reusable event store contract helper for adapter tests.
* Feature-gated SQLite adapter.
* Feature-gated PostgreSQL adapter.
* Bank account example and integration tests.

Deferred adapters and optional capabilities:

* Tracing middleware.