grokking simplicity and refactoring

research/RAG-MCP-TaskMaster-Domain-Model.md

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+# RAG + MCP + TaskMaster Domain Model & Event Architecture
+
+## Executive Summary
+
+This document defines the domain model and event architecture for the RAG + MCP + TaskMaster implementation roadmap. It provides a structured approach to managing the complex integration of retrieval-augmented generation, model context protocol, and task management systems within the home lab environment.
+
+**Purpose**: Enable systematic tracking, state management, and event-driven coordination across all implementation phases.
+
+## Table of Contents
+
+1. [Domain Model Overview](#domain-model-overview)
+2. [Core Entities](#core-entities)
+3. [Event Model](#event-model)
+4. [State Machines](#state-machines)
+5. [Integration Events](#integration-events)
+6. [Implementation Schema](#implementation-schema)
+7. [Event Sourcing Pattern](#event-sourcing-pattern)
+
+## Domain Model Overview
+
+### Bounded Contexts
+
+```mermaid
+graph TB
+    subgraph "Project Management Context"
+        A[Project] --> B[Phase]
+        B --> C[Task]
+        C --> D[Deliverable]
+    end
+    
+    subgraph "Infrastructure Context"
+        E[Service] --> F[Deployment]
+        F --> G[Configuration]
+        G --> H[Environment]
+    end
+    
+    subgraph "AI Integration Context"
+        I[RAG System] --> J[Vector Store]
+        I --> K[MCP Server]
+        K --> L[AI Assistant]
+    end
+    
+    subgraph "Knowledge Context"
+        M[Document] --> N[Embedding]
+        M --> O[Index]
+        O --> P[Query]
+    end
+```
+
+### Core Domain Relationships
+
+```mermaid
+erDiagram
+    PROJECT ||--o{ PHASE : contains
+    PHASE ||--o{ TASK : contains
+    TASK ||--o{ DELIVERABLE : produces
+    TASK ||--o{ DEPENDENCY : depends_on
+    
+    SERVICE ||--o{ DEPLOYMENT : deployed_as
+    DEPLOYMENT ||--o{ CONFIGURATION : configured_by
+    ENVIRONMENT ||--o{ SERVICE : hosts
+    
+    RAG_SYSTEM ||--o{ VECTOR_STORE : uses
+    RAG_SYSTEM ||--o{ MCP_SERVER : exposes_via
+    MCP_SERVER ||--o{ AI_ASSISTANT : serves
+    
+    DOCUMENT ||--o{ EMBEDDING : generates
+    DOCUMENT ||--o{ INDEX_ENTRY : indexed_as
+    QUERY ||--o{ RETRIEVAL_RESULT : produces
+```
+
+## Core Entities
+
+### Project Management Domain
+
+#### Project Aggregate
+```typescript
+interface Project {
+  id: ProjectId;
+  name: string;
+  description: string;
+  status: ProjectStatus;
+  phases: Phase[];
+  startDate: Date;
+  targetCompletionDate: Date;
+  actualCompletionDate?: Date;
+  resources: ResourceRequirement[];
+  risks: Risk[];
+  metadata: ProjectMetadata;
+}
+
+enum ProjectStatus {
+  PLANNED = "planned",
+  IN_PROGRESS = "in_progress", 
+  PAUSED = "paused",
+  COMPLETED = "completed",
+  CANCELLED = "cancelled"
+}
+
+interface ProjectMetadata {
+  priority: Priority;
+  complexity: Complexity;
+  impact: Impact;
+  dependencies: ExternalDependency[];
+}
+```
+
+#### Phase Entity
+```typescript
+interface Phase {
+  id: PhaseId;
+  projectId: ProjectId;
+  name: string;
+  description: string;
+  status: PhaseStatus;
+  objective: string;
+  tasks: Task[];
+  deliverables: Deliverable[];
+  duration: Duration;
+  dependencies: PhaseDependency[];
+  successCriteria: SuccessCriterion[];
+}
+
+enum PhaseStatus {
+  PENDING = "pending",
+  IN_PROGRESS = "in_progress",
+  COMPLETED = "completed", 
+  BLOCKED = "blocked",
+  DEFERRED = "deferred"
+}
+```
+
+#### Task Entity
+```typescript
+interface Task {
+  id: TaskId;
+  phaseId: PhaseId;
+  name: string;
+  description: string;
+  status: TaskStatus;
+  assignee?: UserId;
+  estimatedEffort: Duration;
+  actualEffort?: Duration;
+  dependencies: TaskDependency[];
+  deliverables: Deliverable[];
+  implementation: Implementation;
+  validation: ValidationCriteria;
+}
+
+enum TaskStatus {
+  TODO = "todo",
+  IN_PROGRESS = "in_progress",
+  TESTING = "testing",
+  REVIEW = "review",
+  DONE = "done",
+  BLOCKED = "blocked"
+}
+```
+
+### Infrastructure Domain
+
+#### Service Aggregate
+```typescript
+interface Service {
+  id: ServiceId;
+  name: string;
+  type: ServiceType;
+  status: ServiceStatus;
+  deployments: Deployment[];
+  configuration: ServiceConfiguration;
+  dependencies: ServiceDependency[];
+  healthChecks: HealthCheck[];
+  metrics: ServiceMetrics;
+}
+
+enum ServiceType {
+  RAG_CORE = "rag_core",
+  MCP_SERVER = "mcp_server", 
+  TASK_MASTER = "task_master",
+  VECTOR_DB = "vector_db",
+  LLM_GATEWAY = "llm_gateway"
+}
+
+enum ServiceStatus {
+  PLANNED = "planned",
+  DEVELOPING = "developing",
+  TESTING = "testing",
+  DEPLOYED = "deployed",
+  RUNNING = "running",
+  DEGRADED = "degraded",
+  DOWN = "down"
+}
+```
+
+#### Deployment Entity
+```typescript
+interface Deployment {
+  id: DeploymentId;
+  serviceId: ServiceId;
+  version: Version;
+  environment: Environment;
+  status: DeploymentStatus;
+  configuration: DeploymentConfiguration;
+  timestamp: Date;
+  rollbackConfiguration?: DeploymentConfiguration;
+}
+
+enum DeploymentStatus {
+  PENDING = "pending",
+  IN_PROGRESS = "in_progress",
+  SUCCESSFUL = "successful",
+  FAILED = "failed",
+  ROLLED_BACK = "rolled_back"
+}
+```
+
+### AI Integration Domain
+
+#### RAG System Aggregate
+```typescript
+interface RAGSystem {
+  id: RAGSystemId;
+  name: string;
+  status: RAGSystemStatus;
+  vectorStore: VectorStore;
+  embeddingModel: EmbeddingModel;
+  retrievalConfiguration: RetrievalConfiguration;
+  generationConfiguration: GenerationConfiguration;
+  documents: DocumentIndex;
+  queries: QueryHistory[];
+  performance: PerformanceMetrics;
+}
+
+enum RAGSystemStatus {
+  INITIALIZING = "initializing",
+  INDEXING = "indexing",
+  READY = "ready",
+  QUERYING = "querying",
+  MAINTENANCE = "maintenance",
+  ERROR = "error"
+}
+```
+
+#### MCP Server Entity
+```typescript
+interface MCPServer {
+  id: MCPServerId;
+  name: string;
+  status: MCPServerStatus;
+  protocol: MCPProtocol;
+  tools: MCPTool[];
+  resources: MCPResource[];
+  clients: MCPClient[];
+  capabilities: MCPCapability[];
+  integration: IntegrationConfiguration;
+}
+
+enum MCPServerStatus {
+  STOPPED = "stopped",
+  STARTING = "starting", 
+  RUNNING = "running",
+  ERROR = "error",
+  RESTARTING = "restarting"
+}
+```
+
+### Knowledge Domain
+
+#### Document Entity
+```typescript
+interface Document {
+  id: DocumentId;
+  path: string;
+  content: string;
+  metadata: DocumentMetadata;
+  embeddings: Embedding[];
+  indexStatus: IndexStatus;
+  lastModified: Date;
+  processingHistory: ProcessingEvent[];
+}
+
+interface DocumentMetadata {
+  title: string;
+  type: DocumentType;
+  tags: Tag[];
+  source: DocumentSource;
+  format: DocumentFormat;
+  size: number;
+}
+
+enum IndexStatus {
+  PENDING = "pending",
+  PROCESSING = "processing",
+  INDEXED = "indexed",
+  ERROR = "error",
+  STALE = "stale"
+}
+```
+
+## Event Model
+
+### Project Management Events
+
+#### Project Events
+```typescript
+// Project Lifecycle Events
+interface ProjectCreated {
+  type: "project.created";
+  projectId: ProjectId;
+  name: string;
+  description: string;
+  phases: PhaseDefinition[];
+  timestamp: Date;
+}
+
+interface ProjectStarted {
+  type: "project.started";
+  projectId: ProjectId;
+  startDate: Date;
+  timestamp: Date;
+}
+
+interface ProjectCompleted {
+  type: "project.completed";
+  projectId: ProjectId;
+  completionDate: Date;
+  finalStatus: ProjectStatus;
+  deliverables: Deliverable[];
+  timestamp: Date;
+}
+
+interface ProjectStatusChanged {
+  type: "project.status_changed";
+  projectId: ProjectId;
+  previousStatus: ProjectStatus;
+  newStatus: ProjectStatus;
+  reason: string;
+  timestamp: Date;
+}
+```
+
+#### Phase Events
+```typescript
+interface PhaseStarted {
+  type: "phase.started";
+  phaseId: PhaseId;
+  projectId: ProjectId;
+  plannedDuration: Duration;
+  timestamp: Date;
+}
+
+interface PhaseCompleted {
+  type: "phase.completed";
+  phaseId: PhaseId;
+  projectId: ProjectId;
+  actualDuration: Duration;
+  deliverables: Deliverable[];
+  successCriteriaMet: boolean;
+  timestamp: Date;
+}
+
+interface PhaseBlocked {
+  type: "phase.blocked";
+  phaseId: PhaseId;
+  projectId: ProjectId;
+  blockingIssue: BlockingIssue;
+  estimatedDelay: Duration;
+  timestamp: Date;
+}
+```
+
+#### Task Events
+```typescript
+interface TaskCreated {
+  type: "task.created";
+  taskId: TaskId;
+  phaseId: PhaseId;
+  name: string;
+  description: string;
+  estimatedEffort: Duration;
+  dependencies: TaskDependency[];
+  timestamp: Date;
+}
+
+interface TaskStarted {
+  type: "task.started";
+  taskId: TaskId;
+  assignee: UserId;
+  startDate: Date;
+  timestamp: Date;
+}
+
+interface TaskCompleted {
+  type: "task.completed";
+  taskId: TaskId;
+  completionDate: Date;
+  actualEffort: Duration;
+  deliverables: Deliverable[];
+  timestamp: Date;
+}
+
+interface TaskStatusChanged {
+  type: "task.status_changed";
+  taskId: TaskId;
+  previousStatus: TaskStatus;
+  newStatus: TaskStatus;
+  reason: string;
+  timestamp: Date;
+}
+```
+
+### Infrastructure Events
+
+#### Service Events
+```typescript
+interface ServiceDeploymentStarted {
+  type: "service.deployment_started";
+  serviceId: ServiceId;
+  deploymentId: DeploymentId;
+  version: Version;
+  environment: Environment;
+  timestamp: Date;
+}
+
+interface ServiceDeploymentCompleted {
+  type: "service.deployment_completed";
+  serviceId: ServiceId;
+  deploymentId: DeploymentId;
+  status: DeploymentStatus;
+  healthCheckResults: HealthCheckResult[];
+  timestamp: Date;
+}
+
+interface ServiceHealthChanged {
+  type: "service.health_changed";
+  serviceId: ServiceId;
+  previousStatus: ServiceStatus;
+  newStatus: ServiceStatus;
+  healthMetrics: HealthMetrics;
+  timestamp: Date;
+}
+
+interface ServiceConfigurationUpdated {
+  type: "service.configuration_updated";
+  serviceId: ServiceId;
+  previousConfiguration: ServiceConfiguration;
+  newConfiguration: ServiceConfiguration;
+  changeReason: string;
+  timestamp: Date;
+}
+```
+
+### AI Integration Events
+
+#### RAG System Events
+```typescript
+interface RAGSystemInitialized {
+  type: "rag.system_initialized";
+  ragSystemId: RAGSystemId;
+  configuration: RAGConfiguration;
+  vectorStoreId: VectorStoreId;
+  embeddingModelId: EmbeddingModelId;
+  timestamp: Date;
+}
+
+interface DocumentIndexingStarted {
+  type: "rag.indexing_started";
+  ragSystemId: RAGSystemId;
+  batchId: BatchId;
+  documentCount: number;
+  estimatedDuration: Duration;
+  timestamp: Date;
+}
+
+interface DocumentIndexingCompleted {
+  type: "rag.indexing_completed";
+  ragSystemId: RAGSystemId;
+  batchId: BatchId;
+  processedDocuments: number;
+  successfulIndexes: number;
+  errors: IndexingError[];
+  actualDuration: Duration;
+  timestamp: Date;
+}
+
+interface QueryExecuted {
+  type: "rag.query_executed";
+  ragSystemId: RAGSystemId;
+  queryId: QueryId;
+  query: string;
+  retrievedDocuments: number;
+  responseTime: Duration;
+  relevanceScore: number;
+  timestamp: Date;
+}
+```
+
+#### MCP Integration Events
+```typescript
+interface MCPServerStarted {
+  type: "mcp.server_started";
+  mcpServerId: MCPServerId;
+  protocol: MCPProtocol;
+  availableTools: MCPTool[];
+  availableResources: MCPResource[];
+  timestamp: Date;
+}
+
+interface MCPClientConnected {
+  type: "mcp.client_connected";
+  mcpServerId: MCPServerId;
+  clientId: MCPClientId;
+  clientType: MCPClientType;
+  capabilities: MCPCapability[];
+  timestamp: Date;
+}
+
+interface MCPToolInvoked {
+  type: "mcp.tool_invoked";
+  mcpServerId: MCPServerId;
+  clientId: MCPClientId;
+  toolName: string;
+  parameters: ToolParameters;
+  executionTime: Duration;
+  success: boolean;
+  timestamp: Date;
+}
+
+interface MCPResourceAccessed {
+  type: "mcp.resource_accessed";
+  mcpServerId: MCPServerId;
+  clientId: MCPClientId;
+  resourceUri: string;
+  accessType: AccessType;
+  responseSize: number;
+  timestamp: Date;
+}
+```
+
+## State Machines
+
+### Project State Machine
+
+```mermaid
+stateDiagram-v2
+    [*] --> Planned
+    
+    Planned --> InProgress : project.started
+    InProgress --> Paused : project.paused
+    InProgress --> Completed : project.completed
+    InProgress --> Cancelled : project.cancelled
+    
+    Paused --> InProgress : project.resumed
+    Paused --> Cancelled : project.cancelled
+    
+    Completed --> [*]
+    Cancelled --> [*]
+    
+    state InProgress {
+        [*] --> PhaseExecution
+        PhaseExecution --> PhaseCompleted : phase.completed
+        PhaseCompleted --> PhaseExecution : next_phase
+        PhaseCompleted --> [*] : all_phases_complete
+    }
+```
+
+### Service State Machine
+
+```mermaid
+stateDiagram-v2
+    [*] --> Planned
+    
+    Planned --> Developing : development.started
+    Developing --> Testing : development.completed
+    Testing --> Deployed : tests.passed
+    Testing --> Developing : tests.failed
+    
+    Deployed --> Running : deployment.successful
+    Deployed --> Developing : deployment.failed
+    
+    Running --> Degraded : health.degraded
+    Running --> Down : health.failed
+    
+    Degraded --> Running : health.recovered
+    Degraded --> Down : health.failed
+    
+    Down --> Running : service.restarted
+    Down --> Deployed : rollback.triggered
+```
+
+### RAG System State Machine
+
+```mermaid
+stateDiagram-v2
+    [*] --> Initializing
+    
+    Initializing --> Indexing : initialization.completed
+    Initializing --> Error : initialization.failed
+    
+    Indexing --> Ready : indexing.completed
+    Indexing --> Error : indexing.failed
+    
+    Ready --> Querying : query.received
+    Ready --> Maintenance : maintenance.started
+    Ready --> Indexing : reindex.triggered
+    
+    Querying --> Ready : query.completed
+    Querying --> Error : query.failed
+    
+    Maintenance --> Ready : maintenance.completed
+    Maintenance --> Error : maintenance.failed
+    
+    Error --> Initializing : system.reset
+    Error --> Maintenance : error.diagnosed
+```
+
+## Integration Events
+
+### Cross-System Coordination Events
+
+```typescript
+// Project-Infrastructure Integration
+interface InfrastructureRequirementIdentified {
+  type: "integration.infrastructure_requirement";
+  projectId: ProjectId;
+  phaseId: PhaseId;
+  requiredServices: ServiceRequirement[];
+  targetEnvironment: Environment;
+  deadline: Date;
+  timestamp: Date;
+}
+
+interface ServiceProvisionedForProject {
+  type: "integration.service_provisioned";
+  projectId: ProjectId;
+  serviceId: ServiceId;
+  environment: Environment;
+  endpoints: ServiceEndpoint[];
+  timestamp: Date;
+}
+
+// RAG-MCP Integration
+interface RAGSystemConnectedToMCP {
+  type: "integration.rag_mcp_connected";
+  ragSystemId: RAGSystemId;
+  mcpServerId: MCPServerId;
+  availableTools: string[];
+  availableResources: string[];
+  timestamp: Date;
+}
+
+interface KnowledgeUpdatedInRAG {
+  type: "integration.knowledge_updated";
+  ragSystemId: RAGSystemId;
+  updatedDocuments: DocumentId[];
+  affectedQueries: QueryId[];
+  reindexRequired: boolean;
+  timestamp: Date;
+}
+
+// Task Master Integration
+interface TaskMasterProjectSynced {
+  type: "integration.taskmaster_synced";
+  projectId: ProjectId;
+  taskMasterId: TaskMasterId;
+  syncedTasks: TaskId[];
+  syncedDeliverables: DeliverableId[];
+  timestamp: Date;
+}
+
+interface AIRecommendationGenerated {
+  type: "integration.ai_recommendation";
+  sourceSystem: SystemId;
+  targetEntity: EntityId;
+  recommendationType: RecommendationType;
+  recommendation: Recommendation;
+  confidence: number;
+  timestamp: Date;
+}
+```
+
+## Implementation Schema
+
+### Event Store Schema
+
+```sql
+-- Event Store Table
+CREATE TABLE event_store (
+    id SERIAL PRIMARY KEY,
+    aggregate_id UUID NOT NULL,
+    aggregate_type VARCHAR(50) NOT NULL,
+    event_type VARCHAR(100) NOT NULL,
+    event_data JSONB NOT NULL,
+    event_metadata JSONB,
+    version INTEGER NOT NULL,
+    timestamp TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    correlation_id UUID,
+    causation_id UUID,
+    
+    CONSTRAINT unique_aggregate_version UNIQUE (aggregate_id, version)
+);
+
+-- Projection Tables
+CREATE TABLE project_projections (
+    id UUID PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    status VARCHAR(20) NOT NULL,
+    current_phase_id UUID,
+    progress_percentage DECIMAL(5,2),
+    start_date DATE,
+    target_completion_date DATE,
+    actual_completion_date DATE,
+    last_updated TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+CREATE TABLE service_projections (
+    id UUID PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    type VARCHAR(50) NOT NULL,
+    status VARCHAR(20) NOT NULL,
+    environment VARCHAR(20) NOT NULL,
+    current_version VARCHAR(20),
+    health_status VARCHAR(20),
+    last_deployment TIMESTAMP WITH TIME ZONE,
+    last_updated TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+
+CREATE TABLE rag_system_projections (
+    id UUID PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    status VARCHAR(20) NOT NULL,
+    indexed_documents INTEGER DEFAULT 0,
+    last_indexing TIMESTAMP WITH TIME ZONE,
+    query_count INTEGER DEFAULT 0,
+    average_response_time_ms INTEGER,
+    last_updated TIMESTAMP WITH TIME ZONE DEFAULT NOW()
+);
+```
+
+### Event Handler Framework
+
+```typescript
+// Event Handler Interface
+interface EventHandler<T extends DomainEvent> {
+  handle(event: T): Promise<void>;
+  getEventType(): string;
+}
+
+// Example Event Handlers
+class ProjectStatusChangedHandler implements EventHandler<ProjectStatusChanged> {
+  async handle(event: ProjectStatusChanged): Promise<void> {
+    // Update read model projections
+    await this.updateProjectProjection(event);
+    
+    // Trigger downstream events if needed
+    if (event.newStatus === ProjectStatus.COMPLETED) {
+      await this.publishProjectCompletedIntegrationEvent(event);
+    }
+    
+    // Send notifications
+    await this.notifyStakeholders(event);
+  }
+  
+  getEventType(): string {
+    return "project.status_changed";
+  }
+}
+
+class RAGIndexingCompletedHandler implements EventHandler<DocumentIndexingCompleted> {
+  async handle(event: DocumentIndexingCompleted): Promise<void> {
+    // Update RAG system projection
+    await this.updateRAGProjection(event);
+    
+    // Notify MCP server of updated knowledge
+    await this.notifyMCPServer(event);
+    
+    // Update project progress if this was part of a project task
+    await this.updateRelatedProjectProgress(event);
+  }
+  
+  getEventType(): string {
+    return "rag.indexing_completed";
+  }
+}
+```
+
+## Event Sourcing Pattern
+
+### Command Handlers
+
+```typescript
+// Command Interface
+interface Command {
+  aggregateId: string;
+  expectedVersion: number;
+}
+
+// Example Commands
+interface StartProject extends Command {
+  type: "start_project";
+  name: string;
+  description: string;
+  phases: PhaseDefinition[];
+}
+
+interface DeployService extends Command {
+  type: "deploy_service";
+  serviceId: ServiceId;
+  version: Version;
+  environment: Environment;
+  configuration: DeploymentConfiguration;
+}
+
+interface IndexDocuments extends Command {
+  type: "index_documents";
+  ragSystemId: RAGSystemId;
+  documents: Document[];
+  batchSize: number;
+}
+
+// Command Handlers
+class ProjectCommandHandler {
+  async handle(command: StartProject): Promise<ProjectCreated[]> {
+    // Load existing events for aggregate
+    const existingEvents = await this.eventStore.getEvents(command.aggregateId);
+    
+    // Reconstruct aggregate state
+    const project = Project.fromEvents(existingEvents);
+    
+    // Execute business logic
+    const newEvents = project.start(command);
+    
+    // Save events
+    await this.eventStore.saveEvents(
+      command.aggregateId,
+      newEvents,
+      command.expectedVersion
+    );
+    
+    return newEvents;
+  }
+}
+```
+
+### Aggregate Root Pattern
+
+```typescript
+class Project {
+  private events: DomainEvent[] = [];
+  
+  constructor(
+    public readonly id: ProjectId,
+    public status: ProjectStatus = ProjectStatus.PLANNED,
+    public phases: Phase[] = []
+  ) {}
+  
+  static fromEvents(events: DomainEvent[]): Project {
+    const project = new Project(events[0].aggregateId);
+    
+    events.forEach(event => {
+      project.apply(event);
+    });
+    
+    return project;
+  }
+  
+  start(command: StartProject): DomainEvent[] {
+    if (this.status !== ProjectStatus.PLANNED) {
+      throw new Error("Project must be in planned status to start");
+    }
+    
+    const event = new ProjectStarted({
+      projectId: this.id,
+      startDate: new Date(),
+      timestamp: new Date()
+    });
+    
+    this.applyAndTrack(event);
+    return this.getUncommittedEvents();
+  }
+  
+  private apply(event: DomainEvent): void {
+    switch (event.type) {
+      case "project.created":
+        this.applyProjectCreated(event as ProjectCreated);
+        break;
+      case "project.started":
+        this.applyProjectStarted(event as ProjectStarted);
+        break;
+      // ... other event handlers
+    }
+  }
+  
+  private applyProjectStarted(event: ProjectStarted): void {
+    this.status = ProjectStatus.IN_PROGRESS;
+  }
+  
+  private applyAndTrack(event: DomainEvent): void {
+    this.apply(event);
+    this.events.push(event);
+  }
+  
+  getUncommittedEvents(): DomainEvent[] {
+    return [...this.events];
+  }
+  
+  markEventsAsCommitted(): void {
+    this.events = [];
+  }
+}
+```
+
+## Usage Examples
+
+### Tracking Project Progress
+
+```typescript
+// Query current project status
+const projectStatus = await projectRepository.getProjectStatus(projectId);
+
+// Get detailed phase breakdown
+const phaseProgress = await phaseRepository.getPhaseProgress(projectId);
+
+// Generate project dashboard data
+const dashboardData = {
+  overall: projectStatus,
+  phases: phaseProgress,
+  recentEvents: await eventStore.getRecentEvents(projectId, 10),
+  upcomingMilestones: await milestoneRepository.getUpcoming(projectId)
+};
+```
+
+### Monitoring System Health
+
+```typescript
+// Real-time service monitoring
+const serviceHealth = await serviceRepository.getServiceHealth();
+
+// Check deployment status
+const deploymentStatus = await deploymentRepository.getCurrentDeployments();
+
+// RAG system performance metrics
+const ragMetrics = await ragRepository.getPerformanceMetrics();
+
+// Generate operations dashboard
+const opsData = {
+  services: serviceHealth,
+  deployments: deploymentStatus,
+  rag: ragMetrics,
+  alerts: await alertRepository.getActiveAlerts()
+};
+```
+
+### Event-Driven Automation
+
+```typescript
+// Automatic service provisioning when project phase starts
+class PhaseStartedHandler implements EventHandler<PhaseStarted> {
+  async handle(event: PhaseStarted): Promise<void> {
+    const phase = await phaseRepository.getById(event.phaseId);
+    
+    // Check if this phase requires new infrastructure
+    const infraRequirements = phase.getInfrastructureRequirements();
+    
+    for (const requirement of infraRequirements) {
+      // Trigger service provisioning
+      await this.commandBus.send(new ProvisionService({
+        serviceType: requirement.serviceType,
+        environment: requirement.environment,
+        configuration: requirement.configuration,
+        projectId: event.projectId,
+        phaseId: event.phaseId
+      }));
+    }
+  }
+}
+```
+
+This domain model and event architecture provides a robust foundation for managing the complex RAG + MCP + TaskMaster implementation, enabling clear tracking of progress, automated coordination between systems, and comprehensive monitoring of the entire ecosystem.