Claude Code 6549125f3d docs: Verify and document append-only immutability guarantees ...

Document that EventStore interface has no Update/Delete methods, enforcing
append-only semantics by design. Events are immutable once persisted.

Changes:
- Update EventStore interface documentation in event.go to explicitly state
  immutability guarantee and explain why Update/Delete methods are absent
- Add detailed retention policy documentation to JetStreamConfig showing
  how MaxAge limits enforce automatic expiration without manual deletion
- Document JetStreamEventStore's immutability guarantee with storage-level
  explanation of file-based storage and limits-based retention
- Add comprehensive immutability tests verifying:
  - Events cannot be modified after persistence
  - No Update or Delete methods exist on EventStore interface
  - Versions are monotonically increasing
  - Events cannot be deleted through the API
- Update README with detailed immutability section explaining:
  - Interface-level append-only guarantee
  - Storage-level immutability through JetStream configuration
  - Audit trail reliability
  - Pattern for handling corrections (append new event)

Closes #60

Co-Authored-By: Claude Code <noreply@anthropic.com>

2026-01-13 21:39:45 +00:00

8.9 KiB

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