About Hindsight

Hindsight is an open-source event sourcing library for Haskell, designed to bring type safety and correctness to event-driven architectures.

Project Goals

• Type Safety: Leverage Haskell’s type system to prevent common event sourcing mistakes at compile time
• Extensively Tested: Comprehensive test suite with property-based testing, integration tests, and golden tests
• Developer Experience: Clear APIs, comprehensive documentation, and helpful error messages
• Early Stage: Functional core with PostgreSQL backend, APIs stabilizing toward 1.0

Status

Hindsight is currently in active development. The core API is stabilizing, and we’re working toward a 1.0 release.

Contributing

We welcome contributions! Whether it’s:

• Reporting bugs or requesting features
• Improving documentation
• Submitting pull requests
• Sharing your use cases

Check out the contributing guide to get started.

Community

Development is ongoing. Documentation and community channels coming soon.

License

Hindsight is released under the MIT License. See the repository for full license text.

Acknowledgments

Hindsight builds on the excellent work of the Haskell community, including libraries like:

• hasql for PostgreSQL integration
• aeson for JSON serialization
• stm for concurrency primitives

Thank you to all contributors and the broader Haskell ecosystem.