Babysitter event-sourcing-migrator

Migrate to event-sourcing architecture with event extraction, store setup, and CQRS implementation

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/code-migration-modernization/skills/event-sourcing-migrator" ~/.claude/skills/a5c-ai-babysitter-event-sourcing-migrator && rm -rf "$T"

manifest: library/specializations/code-migration-modernization/skills/event-sourcing-migrator/SKILL.md

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