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[Issue #6] Add event versioning validation #34

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HugoNijhuis merged 1 commits from issue-6-event-versioning-validation into main 2026-01-09 17:09:01 +00:00
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HugoNijhuisandClaude Opus 4.5 02847bdaf5 Add event versioning validation
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Details 
- Add ErrVersionConflict error type and VersionConflictError for detailed
  conflict information
- Implement version validation in InMemoryEventStore.SaveEvent that rejects
  events with version <= current latest version
- Implement version validation in JetStreamEventStore.SaveEvent with version
  caching for performance
- Add comprehensive tests for version conflict detection including concurrent
  writes to same actor
- Document versioning semantics in EventStore interface and CLAUDE.md

This ensures events have monotonically increasing versions per actor and
provides clear error messages for version conflicts, enabling optimistic
concurrency control patterns.

Closes #6

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-01-09 17:56:50 +01:00