Event Sourcing Migrator Skill

Migrates applications to event-sourcing architecture, handling event extraction from existing data, event store setup, and CQRS implementation.

Purpose

Enable event sourcing migration for:

• Event extraction from existing data
• Event store setup
• Projection generation
• CQRS implementation
• Snapshot management

Capabilities

1. Event Extraction from Existing Data

• Analyze current state
• Derive historical events
• Generate event streams
• Handle data gaps

2. Event Store Setup

• Configure event store
• Set up partitioning
• Define retention
• Implement subscriptions

3. Projection Generation

• Create read models
• Build projections
• Handle updates
• Manage consistency

4. CQRS Implementation

• Separate read/write
• Implement commands
• Handle queries
• Manage eventual consistency

5. Snapshot Management

• Define snapshot strategy
• Generate snapshots
• Handle restoration
• Optimize performance

6. Event Replay

• Replay events
• Rebuild projections
• Handle migrations
• Test consistency

Tool Integrations

Tool	Purpose	Integration Method
EventStore	Event database	CLI/API
Axon Framework	Java event sourcing	Library
Marten	.NET event store	Library
EventStoreDB	Event store	CLI
Custom stores	PostgreSQL/Kafka	Library

Output Schema

{
  "migrationId": "string",
  "timestamp": "ISO8601",
  "eventStore": {
    "type": "string",
    "streams": "number",
    "events": "number"
  },
  "projections": [
    {
      "name": "string",
      "status": "string",
      "lastPosition": "number"
    }
  ],
  "snapshots": {
    "enabled": "boolean",
    "count": "number"
  }
}

Integration with Migration Processes

• monolith-to-microservices: Event-driven architecture
• database-schema-migration: Data transformation

Related Skills

• domain-model-extractor: Event discovery

Related Agents

• data-architect-agent: Event architecture