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No. 124 · architecture

Event Sourcing

Immutable event log as source of truth

Version 1.0.0 License MIT Format SKILL.md

Implement event sourcing: design event schemas, build aggregate roots, handle projections, implement CQRS, and manage event versioning and migration.

When to use this skill

  • Designing an event-sourced system
  • Implementing projections
  • Handling event schema evolution

Core concepts

This skill provides guidance on event sourcing best practices, patterns, and common pitfalls. It is designed to be loaded on demand when a relevant task is detected.

Installation

curl -LO https://opencode-skills.example/downloads/architecture/event-sourcing.zip
unzip event-sourcing.zip -d ~/.config/opencode/skills/

Restart OpenCode — the skill loads automatically.

When it triggers

  • designing an event-sourced system
  • implementing projections
  • handling event schema evolution