Karzoun Ledgerstream

What it is

Java 21 event-sourced double-entry ledger engine with PostgreSQL durability, idempotent posting, optimistic concurrency, transactional outbox, and deterministic replay.

LedgerStream is a Java 21 event-sourced double-entry ledger engine focused on accounting invariants, durable PostgreSQL history, idempotent posting, optimistic concurrency, deterministic reconstruction, and transactional outbox delivery. The core separates decision logic from persistence: state is reconstructed from immutable history, commands are validated against accounting and idempotency rules, then accepted events, postings and outbox records cross one database transaction boundary.

Engineering characteristics

• Automated tests
• Continuous integration
• Documentation set
• Open licence
• Persistent storage
• Release pipeline
• Security policy

Testing

The repository contains an automated test suite that runs as part of its checked-in workflow.

Security

The repository publishes a security policy describing how to report vulnerabilities.

Deployment

The repository defines its own build and deployment automation.

Documentation

The repository ships a dedicated documentation set beyond the README.

Topics