# TraceRTM Architecture

System architecture overview for TraceRTM - Multi-view requirements traceability and project management system.

## Table of Contents

- [System Overview](#system-overview)
- [Architecture Principles](#architecture-principles)
- [System Components](#system-components)
- [Data Architecture](#data-architecture)
- [Technology Stack](#technology-stack)
- [Design Patterns](#design-patterns)
- [Multi-View System](#multi-view-system)
- [Link System](#link-system)
- [Agent Architecture](#agent-architecture)
- [Event Sourcing](#event-sourcing)
- [Performance & Scalability](#performance--scalability)
- [Security Architecture](#security-architecture)
- [Deployment Architecture](#deployment-architecture)

## System Overview

TraceRTM is a hybrid, agent-native requirements traceability system designed to manage complex software projects through multiple interconnected views.

### Core Capabilities

- **16 Professional Views**: Feature, Code, Wireframe, API, Test, Database, Architecture, Infrastructure, Data Flow, Security, Performance, Monitoring, Domain Model, User Journey, Configuration, Dependency
- **60+ Link Types**: Across 12 categories for rich relationship modeling
- **Intelligent CRUD**: Auto-generation, smart extension, intelligent collapse
- **Agent-Native**: Support for 1-1000 concurrent autonomous agents
- **Event Sourcing**: Complete audit trail and time-travel capabilities
- **Real-Time Collaboration**: WebSocket-based updates

### Architecture Goals

1. **Scalability**: Handle 100K+ items, 1M+ links per project
2. **Performance**: Sub-100ms query response times
3. **Reliability**: 99.9% uptime with zero data loss
4. **Extensibility**: Easy to add new views, link types, and features
5. **Agent-Friendly**: Optimized for autonomous agent interaction
6. **Developer Experience**: Intuitive APIs and clear abstractions

## Architecture Principles

### 1. Separation of Concerns

```
┌─────────────────────────────────────────────────────────┐
│                    Presentation Layer                    │
│  (CLI, Web UI, Desktop App, API)                        │
└─────────────────────────────────────────────────────────┘
                            │
┌─────────────────────────────────────────────────────────┐
│                    Application Layer                     │
│  (Business Logic, Services, Use Cases)                  │
└─────────────────────────────────────────────────────────┘
                            │
┌─────────────────────────────────────────────────────────┐
│                    Domain Layer                          │
│  (Entities, Value Objects, Domain Events)               │
└─────────────────────────────────────────────────────────┘
                            │
┌─────────────────────────────────────────────────────────┐
│                    Infrastructure Layer                  │
│  (Database, Cache, Message Queue, External Services)    │
└─────────────────────────────────────────────────────────┘
```

### 2. Hexagonal Architecture

```
                    ┌──────────────────┐
                    │   Application    │
                    │      Core        │
                    └──────────────────┘
                            │
        ┌───────────────────┼───────────────────┐
        │                   │                   │
   ┌────▼────┐         ┌────▼────┐        ┌────▼────┐
   │ CLI     │         │ REST    │        │ GraphQL │
   │ Port    │         │ API     │        │ API     │
   └─────────┘         └─────────┘        └─────────┘
        │                   │                   │
   ┌────▼────┐         ┌────▼────┐        ┌────▼────┐
   │ Typer   │         │ Echo    │        │ gqlgen  │
   │ Adapter │         │ Handler │        │ Resolver│
   └─────────┘         └─────────┘        └─────────┘
```

### 3. CQRS (Command Query Responsibility Segregation)

```
Commands (Write)              Queries (Read)
     │                             │
     ▼                             ▼
┌──────────┐                 ┌──────────┐
│ Command  │                 │ Query    │
│ Handlers │                 │ Handlers │
└──────────┘                 └──────────┘
     │                             │
     ▼                             ▼
┌──────────┐                 ┌──────────┐
│ Write DB │                 │ Read DB  │
│ (Master) │────Events──────▶│ (Cache)  │
└──────────┘                 └──────────┘
```

## System Components

### Component Diagram

```
┌─────────────────────────────────────────────────────────────┐
│                        Client Layer                          │
├──────────────┬──────────────┬──────────────┬────────────────┤
│   CLI Tool   │  Web App     │ Desktop App  │  Mobile App    │
│  (Python)    │  (React)     │  (Tauri)     │  (React Native)│
└──────────────┴──────────────┴──────────────┴────────────────┘
                              │
┌─────────────────────────────▼─────────────────────────────┐
│                     API Gateway (Future)                   │
│  (Kong, Nginx, Traefik)                                   │
└────────────────────────────────────────────────────────────┘
                              │
┌─────────────────────────────▼─────────────────────────────┐
│                    Backend Services                        │
├────────────────┬──────────────┬──────────────┬────────────┤
│   REST API     │  GraphQL     │  WebSocket   │  gRPC      │
│   (Go/Echo)    │  (Go/gqlgen) │  (Go/ws)     │  (Future)  │
└────────────────┴──────────────┴──────────────┴────────────┘
                              │
┌─────────────────────────────▼─────────────────────────────┐
│                    Service Layer                           │
├──────────────┬──────────────┬──────────────┬──────────────┤
│   Project    │   Item       │   Link       │   Agent      │
│   Service    │   Service    │   Service    │   Service    │
└──────────────┴──────────────┴──────────────┴──────────────┘
                              │
┌─────────────────────────────▼─────────────────────────────┐
│                    Data Access Layer                       │
├──────────────┬──────────────┬──────────────┬──────────────┤
│   sqlc       │   Repository │   Cache      │   Events     │
│   (Type-safe)│   Pattern    │   (Redis)    │   (NATS)     │
└──────────────┴──────────────┴──────────────┴──────────────┘
                              │
┌─────────────────────────────▼─────────────────────────────┐
│                    Storage Layer                           │
├──────────────┬──────────────┬──────────────┬──────────────┤
│  PostgreSQL  │   Redis      │   NATS       │   S3/Blob    │
│  (Primary)   │   (Cache)    │   (Events)   │   (Files)    │
└──────────────┴──────────────┴──────────────┴──────────────┘
```

### Component Responsibilities

#### Backend Services
- **REST API**: CRUD operations, filtering, pagination
- **GraphQL API**: Complex queries, nested data fetching
- **WebSocket**: Real-time updates, collaborative editing
- **gRPC**: Internal service communication (future)

#### Service Layer
- **Project Service**: Project lifecycle management
- **Item Service**: Item CRUD, validation, business rules
- **Link Service**: Link creation, graph traversal
- **Agent Service**: Agent registration, heartbeat, coordination

#### Data Access Layer
- **sqlc**: Type-safe SQL queries (no ORM overhead)
- **Repository Pattern**: Clean data access abstraction
- **Cache Layer**: Redis for frequently accessed data
- **Event Store**: NATS for event sourcing

## Data Architecture

### Entity-Relationship Diagram

```
┌──────────────┐
│   Projects   │
│              │
│ - id (PK)    │
│ - name       │
│ - desc       │
│ - metadata   │
└──────┬───────┘
       │
       │ 1:N
       ▼
┌──────────────┐          ┌──────────────┐
│    Items     │          │    Links     │
│              │          │              │
│ - id (PK)    │◀─────────│ - id (PK)    │
│ - project_id │  source  │ - source_id  │
│ - title      │          │ - target_id  │
│ - type       │◀─────────│ - type       │
│ - status     │  target  │ - metadata   │
│ - priority   │          └──────────────┘
│ - metadata   │
└──────┬───────┘
       │
       │ 1:N
       ▼
┌──────────────┐
│    Events    │
│              │
│ - id (PK)    │
│ - entity_id  │
│ - event_type │
│ - data       │
│ - created_at │
└──────────────┘

       │
       │ 1:N
       ▼
┌──────────────┐
│    Agents    │
│              │
│ - id (PK)    │
│ - project_id │
│ - name       │
│ - status     │
│ - metadata   │
└──────────────┘
```

### Database Schema Design

#### Core Principles
1. **UUID Primary Keys**: Globally unique, distributed-friendly
2. **JSONB Metadata**: Flexible schema evolution
3. **Soft Deletes**: Maintain data integrity and audit trail
4. **Timestamps**: Track creation and modification
5. **Indexes**: Optimize common queries

#### Table Designs

**Projects Table**
```sql
CREATE TABLE projects (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(255) NOT NULL UNIQUE,
    description TEXT,
    metadata JSONB DEFAULT '{}',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    deleted_at TIMESTAMP,

    -- Indexes
    INDEX idx_projects_name (name),
    INDEX idx_projects_deleted_at (deleted_at)
);
```

**Items Table**
```sql
CREATE TABLE items (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    project_id UUID NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    type VARCHAR(50) NOT NULL,
    status VARCHAR(50) NOT NULL DEFAULT 'todo',
    priority INTEGER DEFAULT 50,
    metadata JSONB DEFAULT '{}',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    deleted_at TIMESTAMP,

    -- Indexes
    INDEX idx_items_project_id (project_id),
    INDEX idx_items_project_type (project_id, type),
    INDEX idx_items_project_status (project_id, status),
    INDEX idx_items_deleted_at (deleted_at)
);
```

**Links Table**
```sql
CREATE TABLE links (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    source_id UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
    target_id UUID NOT NULL REFERENCES items(id) ON DELETE CASCADE,
    type VARCHAR(50) NOT NULL,
    metadata JSONB DEFAULT '{}',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    deleted_at TIMESTAMP,

    -- Indexes
    INDEX idx_links_source_id (source_id),
    INDEX idx_links_target_id (target_id),
    INDEX idx_links_type (type),
    INDEX idx_links_deleted_at (deleted_at),

    -- Prevent duplicate links
    UNIQUE (source_id, target_id, type, deleted_at)
);
```

### Graph Traversal

#### Recursive CTE for Descendants

```sql
WITH RECURSIVE descendants AS (
    -- Base case: start item
    SELECT id, title, type, 1 as depth
    FROM items
    WHERE id = $1 AND deleted_at IS NULL

    UNION ALL

    -- Recursive case: follow links
    SELECT i.id, i.title, i.type, d.depth + 1
    FROM items i
    JOIN links l ON i.id = l.target_id
    JOIN descendants d ON l.source_id = d.id
    WHERE i.deleted_at IS NULL
      AND l.deleted_at IS NULL
      AND d.depth < $2  -- Max depth limit
)
SELECT * FROM descendants;
```

#### Recursive CTE for Ancestors

```sql
WITH RECURSIVE ancestors AS (
    SELECT id, title, type, 1 as depth
    FROM items
    WHERE id = $1 AND deleted_at IS NULL

    UNION ALL

    SELECT i.id, i.title, i.type, a.depth + 1
    FROM items i
    JOIN links l ON i.id = l.source_id
    JOIN ancestors a ON l.target_id = a.id
    WHERE i.deleted_at IS NULL
      AND l.deleted_at IS NULL
      AND a.depth < $2
)
SELECT * FROM ancestors;
```

## Technology Stack

### Backend
- **Language**: Go 1.23+
- **Web Framework**: Echo (lightweight, high-performance)
- **Database Driver**: pgx (PostgreSQL native driver)
- **Query Builder**: sqlc (type-safe SQL generation)
- **Validation**: go-playground/validator
- **Configuration**: viper
- **Logging**: zap (structured logging)

### CLI
- **Language**: Python 3.12+
- **CLI Framework**: Typer (modern CLI with type hints)
- **Terminal UI**: Rich (beautiful terminal output)
- **TUI**: Textual (full-featured TUI framework)
- **HTTP Client**: httpx (async HTTP client)
- **Validation**: Pydantic v2

### Database
- **Primary**: PostgreSQL 14+
- **Extensions**: pgvector (vector search), pg_trgm (fuzzy search)
- **Connection Pooling**: PgBouncer
- **Migrations**: Alembic (Python), golang-migrate (Go)

### Caching
- **In-Memory**: Redis 7+
- **Strategies**: Cache-aside, Write-through
- **TTL**: Configurable per resource type

### Messaging
- **Pub/Sub**: NATS 2.9+
- **Patterns**: Publish-subscribe, Request-reply
- **Use Cases**: Event sourcing, agent coordination

### Observability
- **Metrics**: Prometheus + Grafana
- **Logging**: Structured JSON logs (zap, loguru)
- **Tracing**: OpenTelemetry (future)

## Design Patterns

### Repository Pattern

```go
type ItemRepository interface {
    Create(ctx context.Context, item *Item) error
    Get(ctx context.Context, id uuid.UUID) (*Item, error)
    List(ctx context.Context, filters ItemFilters) ([]*Item, error)
    Update(ctx context.Context, item *Item) error
    Delete(ctx context.Context, id uuid.UUID) error
}

type PostgresItemRepository struct {
    queries *db.Queries
}

func (r *PostgresItemRepository) Create(ctx context.Context, item *Item) error {
    params := db.CreateItemParams{
        ProjectID:   item.ProjectID,
        Title:       item.Title,
        Type:        item.Type,
        // ... other fields
    }
    result, err := r.queries.CreateItem(ctx, params)
    // ... handle result
}
```

### Service Layer Pattern

```go
type ItemService struct {
    repo  ItemRepository
    cache CacheService
    events EventService
}

func (s *ItemService) CreateItem(ctx context.Context, req CreateItemRequest) (*Item, error) {
    // 1. Validate request
    if err := req.Validate(); err != nil {
        return nil, err
    }

    // 2. Business logic
    item := &Item{
        ProjectID: req.ProjectID,
        Title:     req.Title,
        // ... map fields
    }

    // 3. Persist to database
    if err := s.repo.Create(ctx, item); err != nil {
        return nil, err
    }

    // 4. Update cache
    s.cache.Set(ctx, item.ID.String(), item)

    // 5. Publish event
    s.events.Publish(ctx, "item.created", item)

    return item, nil
}
```

### Factory Pattern

```go
type ItemFactory struct{}

func (f *ItemFactory) CreateFromType(itemType string) Item {
    switch itemType {
    case "feature":
        return &FeatureItem{}
    case "code":
        return &CodeItem{}
    case "test":
        return &TestItem{}
    default:
        return &GenericItem{}
    }
}
```

### Strategy Pattern

```go
type LinkValidator interface {
    Validate(source, target *Item) error
}

type HierarchicalLinkValidator struct{}
type DependencyLinkValidator struct{}
type ImplementationLinkValidator struct{}

func GetValidator(linkType string) LinkValidator {
    switch linkType {
    case "parent_of", "child_of":
        return &HierarchicalLinkValidator{}
    case "depends_on", "required_by":
        return &DependencyLinkValidator{}
    case "implements", "implemented_by":
        return &ImplementationLinkValidator{}
    default:
        return &DefaultLinkValidator{}
    }
}
```

## Multi-View System

### View Architecture

```
┌──────────────────────────────────────────────────────────┐
│                    View Manager                           │
│  - View Registry                                         │
│  - View Switching Logic                                  │
│  - View State Management                                 │
└──────────────────────────────────────────────────────────┘
                         │
        ┌────────────────┼────────────────┐
        ▼                ▼                ▼
┌──────────────┐  ┌──────────────┐  ┌──────────────┐
│ Feature View │  │  Code View   │  │  Test View   │
│              │  │              │  │              │
│ - Filter     │  │ - Filter     │  │ - Filter     │
│ - Transform  │  │ - Transform  │  │ - Transform  │
│ - Render     │  │ - Render     │  │ - Render     │
└──────────────┘  └──────────────┘  └──────────────┘
```

### 16 View Types

1. **Feature View**: Feature requirements and stories
2. **Code View**: Source code implementations
3. **Wireframe View**: UI/UX designs and mockups
4. **API View**: API endpoints and contracts
5. **Test View**: Test cases and coverage
6. **Database View**: Database schemas and migrations
7. **Architecture View**: System components and diagrams
8. **Infrastructure View**: Deployment and infrastructure
9. **Data Flow View**: Data pipelines and transformations
10. **Security View**: Security requirements and vulnerabilities
11. **Performance View**: Performance metrics and benchmarks
12. **Monitoring View**: Monitoring dashboards and alerts
13. **Domain Model View**: Domain entities and relationships
14. **User Journey View**: User flows and experiences
15. **Configuration View**: Configuration management
16. **Dependency View**: External dependencies and versions

### View Implementation

```go
type View interface {
    Name() string
    Filter(items []*Item) []*Item
    Transform(items []*Item) interface{}
    Render(data interface{}) string
}

type FeatureView struct{}

func (v *FeatureView) Name() string {
    return "feature"
}

func (v *FeatureView) Filter(items []*Item) []*Item {
    var filtered []*Item
    for _, item := range items {
        if item.Type == "feature" {
            filtered = append(filtered, item)
        }
    }
    return filtered
}

func (v *FeatureView) Transform(items []*Item) interface{} {
    // Transform to view-specific format
    // Add computed fields, aggregate data, etc.
}

func (v *FeatureView) Render(data interface{}) string {
    // Render to terminal, JSON, HTML, etc.
}
```

## Link System

### Link Categories (12 Total)

```
Link Categories
├── 1. Hierarchical (parent_of, child_of, contains)
├── 2. Dependency (depends_on, blocks, enables)
├── 3. Implementation (implements, realizes, satisfies)
├── 4. Testing (tests, verifies, validates)
├── 5. Temporal (precedes, follows, triggers)
├── 6. Conflict (conflicts_with, contradicts)
├── 7. Communication (relates_to, references, derived_from)
├── 8. Data (produces, consumes, transforms)
├── 9. Deployment (deploys_to, runs_on, scales_with)
├── 10. Security (authenticates, authorizes, encrypts)
├── 11. Performance (optimizes, caches, indexes)
└── 12. Monitoring (monitors, alerts_on, logs)
```

### Link Validation Rules

```go
type LinkRule struct {
    AllowedSourceTypes []string
    AllowedTargetTypes []string
    Bidirectional      bool
    MaxCount           int // 0 = unlimited
}

var LinkRules = map[string]LinkRule{
    "implements": {
        AllowedSourceTypes: []string{"code", "api"},
        AllowedTargetTypes: []string{"feature", "requirement"},
        Bidirectional:      false,
        MaxCount:           0,
    },
    "tests": {
        AllowedSourceTypes: []string{"test"},
        AllowedTargetTypes: []string{"code", "feature", "api"},
        Bidirectional:      false,
        MaxCount:           0,
    },
    "parent_of": {
        AllowedSourceTypes: []string{"feature", "epic"},
        AllowedTargetTypes: []string{"feature", "story", "task"},
        Bidirectional:      false,
        MaxCount:           0,
    },
}
```

## Agent Architecture

### Agent Lifecycle

```
   ┌─────────┐
   │ Created │
   └────┬────┘
        │
        ▼
   ┌─────────┐     Heartbeat      ┌─────────┐
   │  Idle   │◄──────────────────►│ Active  │
   └────┬────┘                    └────┬────┘
        │                              │
        │         Error                │
        └──────────────►┌─────────┐◄──┘
                        │  Error  │
                        └────┬────┘
                             │
                             ▼
                        ┌─────────┐
                        │ Deleted │
                        └─────────┘
```

### Agent Communication

```go
type AgentMessage struct {
    ID        uuid.UUID
    AgentID   uuid.UUID
    Type      string // "command", "response", "event"
    Payload   interface{}
    Timestamp time.Time
}

type AgentCoordinator struct {
    nats      *nats.Conn
    agents    map[uuid.UUID]*Agent
    messageCh chan AgentMessage
}

func (ac *AgentCoordinator) SendCommand(agentID uuid.UUID, cmd Command) error {
    msg := AgentMessage{
        ID:      uuid.New(),
        AgentID: agentID,
        Type:    "command",
        Payload: cmd,
    }
    return ac.nats.Publish(fmt.Sprintf("agent.%s", agentID), msg)
}
```

## Event Sourcing

### Event Store

```
┌─────────────────────────────────────────────────────┐
│                   Event Store                        │
│  - Append-only log                                  │
│  - Immutable events                                 │
│  - Full audit trail                                 │
└─────────────────────────────────────────────────────┘
         │
         ├─► Event 1: ItemCreated
         ├─► Event 2: ItemUpdated
         ├─► Event 3: LinkCreated
         ├─► Event 4: ItemDeleted
         └─► Event 5: ...
```

### Event Types

```go
type Event struct {
    ID         uuid.UUID
    ProjectID  uuid.UUID
    EntityType string
    EntityID   uuid.UUID
    EventType  string
    Data       map[string]interface{}
    CreatedAt  time.Time
}

const (
    EventItemCreated    = "item.created"
    EventItemUpdated    = "item.updated"
    EventItemDeleted    = "item.deleted"
    EventLinkCreated    = "link.created"
    EventLinkDeleted    = "link.deleted"
    EventProjectCreated = "project.created"
)
```

## Performance & Scalability

### Caching Strategy

```
┌──────────────┐
│   Request    │
└──────┬───────┘
       │
       ▼
┌──────────────┐     Hit      ┌──────────────┐
│    Cache     │─────────────►│   Response   │
│   (Redis)    │              └──────────────┘
└──────┬───────┘
       │ Miss
       ▼
┌──────────────┐
│   Database   │
│ (PostgreSQL) │
└──────┬───────┘
       │
       ▼
┌──────────────┐
│  Update      │
│   Cache      │
└──────────────┘
```

### Database Optimization

- **Indexes**: Strategic indexes on frequently queried columns
- **Connection Pooling**: PgBouncer for connection reuse
- **Read Replicas**: Horizontal scaling for read operations
- **Partitioning**: Time-based partitioning for events table
- **Materialized Views**: Pre-computed aggregations

### Load Balancing

```
       ┌──────────────┐
       │ Load Balancer│
       │  (Nginx)     │
       └──────┬───────┘
              │
       ┌──────┼──────┐
       │      │      │
       ▼      ▼      ▼
   ┌────┐  ┌────┐  ┌────┐
   │API1│  │API2│  │API3│
   └────┘  └────┘  └────┘
       │      │      │
       └──────┼──────┘
              │
       ┌──────▼───────┐
       │  PostgreSQL  │
       │   (Primary)  │
       └──────────────┘
```

## Security Architecture

### Authentication Flow (JWT)

```
1. User Login
   ├─► POST /auth/login {email, password}
   ├─► Validate credentials
   ├─► Generate JWT token
   └─► Return {access_token, refresh_token}

2. API Request
   ├─► Include: Authorization: Bearer <token>
   ├─► Validate JWT signature
   ├─► Check expiration
   ├─► Extract user claims
   └─► Process request

3. Token Refresh
   ├─► POST /auth/refresh {refresh_token}
   ├─► Validate refresh token
   ├─► Generate new access token
   └─► Return {access_token}
```

### Authorization (RBAC)

```
Roles:
  - Admin: Full access
  - Developer: Read/Write items and links
  - Viewer: Read-only access
  - Agent: Limited API access

Permissions:
  - projects.create
  - projects.read
  - projects.update
  - projects.delete
  - items.create
  - items.read
  - items.update
  - items.delete
  - links.create
  - links.read
  - links.delete
```

## Deployment Architecture

### Docker Compose (Development)

```yaml
services:
  postgres:
    image: postgres:14
    environment:
      POSTGRES_DB: tracertm
      POSTGRES_USER: tracertm
      POSTGRES_PASSWORD: tracertm
    ports:
      - "5432:5432"

  redis:
    image: redis:7
    ports:
      - "6379:6379"

  nats:
    image: nats:2.9
    ports:
      - "4222:4222"

  backend:
    build: ./backend
    environment:
      DATABASE_URL: postgres://tracertm:tracertm@postgres:5432/tracertm
      REDIS_URL: redis://redis:6379
      NATS_URL: nats://nats:4222
    ports:
      - "8080:8080"
    depends_on:
      - postgres
      - redis
      - nats
```

### Kubernetes (Production)

```
┌──────────────────────────────────────────────────────┐
│                   Kubernetes Cluster                  │
│                                                       │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐ │
│  │   Ingress   │  │   Service   │  │   Service   │ │
│  │ (Nginx/LB)  │  │    Mesh     │  │  Registry   │ │
│  └─────────────┘  └─────────────┘  └─────────────┘ │
│                                                       │
│  ┌─────────────────────────────────────────────────┐ │
│  │            Application Pods                      │ │
│  │  ┌──────┐  ┌──────┐  ┌──────┐  ┌──────┐        │ │
│  │  │ API1 │  │ API2 │  │ API3 │  │ API4 │        │ │
│  │  └──────┘  └──────┘  └──────┘  └──────┘        │ │
│  └─────────────────────────────────────────────────┘ │
│                                                       │
│  ┌─────────────────────────────────────────────────┐ │
│  │            Stateful Services                     │ │
│  │  ┌──────────┐  ┌────────┐  ┌────────┐          │ │
│  │  │PostgreSQL│  │ Redis  │  │  NATS  │          │ │
│  │  │StatefulSet  │ Cluster│  │ Cluster│          │ │
│  │  └──────────┘  └────────┘  └────────┘          │ │
│  └─────────────────────────────────────────────────┘ │
└──────────────────────────────────────────────────────┘
```

---

## Future Enhancements

### Phase 2
- GraphQL API
- WebSocket real-time updates
- Full-text search with pg_trgm
- Advanced caching strategies

### Phase 3
- Web UI (React)
- Desktop app (Tauri)
- Mobile apps (React Native)
- Offline-first capabilities

### Phase 4
- AI/ML integration
- Graph database (Neo4j)
- Advanced analytics
- Custom workflow engine

### Phase 5
- Multi-tenancy
- Advanced RBAC
- Audit logs UI
- Compliance reporting

---

## References

- [Database Schema](../../backend/schema.sql)
- [API Documentation](../api/README.md)
- [CLI Documentation](../cli/README.md)
- [Development Guide](../development/README.md)

## License

MIT License - see LICENSE file for details.
