docs: add Domain-Driven Design analysis report

Comprehensive DDD analysis of the Smesh codebase including: - Domain and bounded context identification - Anti-pattern analysis with remediation strategies - 5-phase refactoring roadmap - Migration strategy and success metrics 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2025-12-26 12:28:32 +02:00
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+# Domain-Driven Design Analysis: Smesh Nostr Client
+
+## Executive Summary
+
+This document provides a Domain-Driven Design (DDD) analysis of the Smesh codebase, a React/TypeScript Nostr client. The analysis identifies the implicit domain model, evaluates current architecture against DDD principles, and provides actionable recommendations for refactoring toward a more domain-centric design.
+
+**Key Findings:**
+- The codebase has implicit bounded contexts but lacks explicit boundaries
+- Domain logic is scattered across providers, services, and lib utilities
+- The architecture exhibits several DDD anti-patterns (Anemic Domain Model, Smart UI tendencies)
+- Nostr events naturally align with Domain Events pattern
+- Strong foundation exists for incremental DDD adoption
+
+---
+
+## 1. Domain Analysis
+
+### 1.1 Core Domain Identification
+
+The Smesh application operates in the **decentralized social networking** domain, specifically implementing the Nostr protocol. The core business capabilities are:
+
+| Subdomain | Type | Description |
+|-----------|------|-------------|
+| **Identity & Authentication** | Core | Key management, signing, account switching |
+| **Social Graph** | Core | Following, muting, trust relationships |
+| **Content Publishing** | Core | Notes, reactions, reposts, media |
+| **Feed Curation** | Core | Timeline construction, filtering, relay selection |
+| **Relay Management** | Supporting | Relay sets, discovery, connectivity |
+| **Notifications** | Supporting | Real-time event monitoring |
+| **Translation** | Generic | Multi-language content translation |
+| **Media Upload** | Generic | NIP-96/Blossom file hosting |
+
+### 1.2 Ubiquitous Language
+
+The codebase uses Nostr protocol terminology, which forms the basis of the ubiquitous language:
+
+| Term | Definition | Current Implementation |
+|------|------------|----------------------|
+| **Event** | Signed JSON object (note, reaction, etc.) | `nostr-tools` Event type |
+| **Pubkey** | User's public key identifier | String (should be Value Object) |
+| **Relay** | WebSocket server for event distribution | String URL (should be Value Object) |
+| **Kind** | Event type identifier (0=profile, 1=note, etc.) | Number constants in `constants.ts` |
+| **Tag** | Metadata attached to events (p, e, a tags) | String arrays (should be Value Objects) |
+| **Profile** | User metadata (name, avatar, etc.) | `TProfile` type |
+| **Follow List** | User's contact list (kind 3) | Array in `FollowListProvider` |
+| **Mute List** | Blocked users/content (kind 10000) | Array in `MuteListProvider` |
+| **Relay List** | User's preferred relays (kind 10002) | `TRelayList` type |
+| **Signer** | Key management abstraction | `ISigner` interface |
+
+**Language Issues Identified:**
+- "Stuff Stats" is unclear domain terminology (rename to `InteractionMetrics`)
+- "Favorite Relays" vs "Relay Sets" inconsistency
+- "Draft Event" conflates unsigned events with work-in-progress content
+
+---
+
+## 2. Current Architecture Assessment
+
+### 2.1 Directory Structure Analysis
+
+```
+src/
+├── providers/     # State management + some domain logic (17 contexts)
+├── services/      # Business logic + infrastructure concerns mixed
+├── lib/           # Utility functions + domain logic mixed
+├── types/         # Type definitions (implicit domain model)
+├── components/    # UI components (some contain business logic)
+├── pages/         # Page components
+└── hooks/         # Custom React hooks
+```
+
+**Assessment:** The architecture follows a layered approach but lacks explicit domain layer separation. Domain logic is distributed across:
+- `lib/` - Event manipulation, validation
+- `services/` - Data fetching, caching, persistence
+- `providers/` - State management with embedded business rules
+
+### 2.2 Implicit Bounded Contexts
+
+The codebase contains several implicit bounded contexts that could be made explicit:
+
+```
+┌─────────────────────────────────────────────────────────────────┐
+│                        CONTEXT MAP                               │
+├─────────────────────────────────────────────────────────────────┤
+│                                                                  │
+│  ┌──────────────┐      Partnership      ┌──────────────┐        │
+│  │   Identity   │◄────────────────────►│ Social Graph │        │
+│  │   Context    │                       │   Context    │        │
+│  └──────┬───────┘                       └──────┬───────┘        │
+│         │                                      │                 │
+│         │ Customer/Supplier                    │                 │
+│         ▼                                      ▼                 │
+│  ┌──────────────┐                       ┌──────────────┐        │
+│  │   Content    │                       │    Feed      │        │
+│  │   Context    │                       │   Context    │        │
+│  └──────────────┘                       └──────────────┘        │
+│         │                                      │                 │
+│         └──────────────┬───────────────────────┘                │
+│                        ▼                                         │
+│                 ┌──────────────┐                                │
+│                 │    Relay     │                                │
+│                 │   Context    │                                │
+│                 └──────────────┘                                │
+│                                                                  │
+└─────────────────────────────────────────────────────────────────┘
+```
+
+**Context Descriptions:**
+
+1. **Identity Context**
+   - Concerns: Key management, signing, account switching
+   - Current: `NostrProvider`, `ISigner` implementations
+   - Entities: Account, Signer
+
+2. **Social Graph Context**
+   - Concerns: Following, muting, trust, pinned users
+   - Current: `FollowListProvider`, `MuteListProvider`, `UserTrustProvider`
+   - Entities: User, FollowList, MuteList
+
+3. **Content Context**
+   - Concerns: Creating and publishing events
+   - Current: `lib/draft-event.ts`, publishing logic in providers
+   - Entities: Note, Reaction, Repost, Bookmark
+
+4. **Feed Context**
+   - Concerns: Timeline construction, filtering, display
+   - Current: `FeedProvider`, `KindFilterProvider`, `NotificationProvider`
+   - Entities: Feed, Filter, Timeline
+
+5. **Relay Context**
+   - Concerns: Relay management, connectivity, selection
+   - Current: `FavoriteRelaysProvider`, `ClientService`
+   - Entities: Relay, RelaySet, RelayList
+
+---
+
+## 3. Anti-Pattern Analysis
+
+### 3.1 Anemic Domain Model
+
+**Severity: High**
+
+The current implementation exhibits a classic anemic domain model. Domain types are primarily data structures without behavior.
+
+**Evidence:**
+
+```typescript
+// Current: Types are data containers (src/types/index.d.ts)
+type TProfile = {
+  pubkey: string
+  username?: string
+  displayName?: string
+  avatar?: string
+  // ... no behavior
+}
+
+// Business logic lives in external functions (src/lib/event-metadata.ts)
+export function extractProfileFromEventContent(event: Event): TProfile {
+  // Logic external to the domain object
+}
+```
+
+**Impact:**
+- Business rules scattered across `lib/`, `services/`, `providers/`
+- Difficult to find all rules related to a concept
+- Easy to bypass validation by directly manipulating data
+
+### 3.2 Smart UI Tendencies
+
+**Severity: Medium**
+
+Some business logic exists in UI components and providers that should be in domain layer.
+
+**Evidence:**
+
+```typescript
+// Provider contains domain logic (src/providers/FollowListProvider.tsx)
+const follow = async (pubkey: string) => {
+  // Business rule: can't follow yourself
+  if (pubkey === currentPubkey) return
+
+  // Business rule: avoid duplicates
+  if (followList.includes(pubkey)) return
+
+  // Event creation and publishing
+  const newFollowList = [...followList, pubkey]
+  const draftEvent = createFollowListDraftEvent(...)
+  await publish(draftEvent)
+}
+```
+
+This logic belongs in a domain service or aggregate, not in a React context provider.
+
+### 3.3 Database-Driven Design Elements
+
+**Severity: Low**
+
+The `IndexedDB` schema influences some type definitions, though this is less severe than traditional database-driven design.
+
+**Evidence:**
+- Storage keys defined alongside domain constants
+- Some types mirror storage structure rather than domain concepts
+
+### 3.4 Missing Aggregate Boundaries
+
+**Severity: Medium**
+
+No explicit aggregate roots or boundaries exist. Related data is managed independently.
+
+**Evidence:**
+- `FollowList`, `MuteList`, `PinList` are managed by separate providers
+- No transactional consistency guarantees
+- Cross-cutting updates happen independently
+
+### 3.5 Leaky Abstractions
+
+**Severity: Medium**
+
+Infrastructure concerns leak into what should be domain logic.
+
+**Evidence:**
+
+```typescript
+// Service mixes domain and infrastructure (src/services/client.service.ts)
+class ClientService extends EventTarget {
+  private pool = new SimplePool()           // Infrastructure
+  private cache = new LRUCache(...)         // Infrastructure
+  private userIndex = new FlexSearch(...)   // Infrastructure
+
+  // Domain logic mixed with caching, batching, retries
+  async fetchProfile(pubkey: string): Promise<TProfile | null> {
+    // Caching logic
+    // Relay selection logic (domain)
+    // Network calls (infrastructure)
+    // Index updates (infrastructure)
+  }
+}
+```
+
+---
+
+## 4. Current Strengths
+
+### 4.1 Natural Domain Event Alignment
+
+Nostr events ARE domain events. The protocol's event-sourced nature aligns perfectly with DDD:
+
+```typescript
+// Nostr events capture domain facts
+{
+  kind: 1,                    // Note created
+  content: "Hello Nostr!",
+  tags: [["p", "..."]],       // Mentions
+  created_at: 1234567890,
+  pubkey: "...",
+  sig: "..."
+}
+```
+
+### 4.2 Signer Interface Abstraction
+
+The `ISigner` interface is a well-designed port in hexagonal architecture terms:
+
+```typescript
+interface ISigner {
+  getPublicKey(): Promise<string>
+  signEvent(draftEvent: TDraftEvent): Promise<VerifiedEvent>
+  nip04Encrypt(pubkey: string, plainText: string): Promise<string>
+  nip04Decrypt(pubkey: string, cipherText: string): Promise<string>
+}
+```
+
+Multiple implementations exist: `NsecSigner`, `Nip07Signer`, `BunkerSigner`, etc.
+
+### 4.3 Event Creation Factories
+
+The `lib/draft-event.ts` file contains factory functions that encapsulate event creation:
+
+```typescript
+createShortTextNoteDraftEvent(content, tags?, relays?)
+createReactionDraftEvent(event, emoji?)
+createFollowListDraftEvent(tags, content?)
+createBookmarkDraftEvent(tags, content?)
+```
+
+These are proto-factories that could be formalized into proper Factory patterns.
+
+### 4.4 Clear Type Definitions
+
+The `types/index.d.ts` file provides a foundation for a rich domain model, even if currently anemic.
+
+---
+
+## 5. Refactoring Recommendations
+
+### 5.1 Phase 1: Establish Domain Layer (Low Risk)
+
+**Goal:** Create explicit domain layer without disrupting existing functionality.
+
+**Actions:**
+
+1. **Create domain directory structure:**
+
+```
+src/
+├── domain/
+│   ├── identity/
+│   │   ├── Account.ts
+│   │   ├── Pubkey.ts (Value Object)
+│   │   └── index.ts
+│   ├── social/
+│   │   ├── FollowList.ts (Aggregate)
+│   │   ├── MuteList.ts (Aggregate)
+│   │   └── index.ts
+│   ├── content/
+│   │   ├── Note.ts (Entity)
+│   │   ├── Reaction.ts (Value Object)
+│   │   └── index.ts
+│   ├── relay/
+│   │   ├── Relay.ts (Value Object)
+│   │   ├── RelaySet.ts (Aggregate)
+│   │   └── index.ts
+│   └── shared/
+│       ├── EventId.ts
+│       ├── Timestamp.ts
+│       └── index.ts
+```
+
+2. **Introduce Value Objects for primitives:**
+
+```typescript
+// src/domain/identity/Pubkey.ts
+export class Pubkey {
+  private constructor(private readonly value: string) {}
+
+  static fromHex(hex: string): Pubkey {
+    if (!/^[0-9a-f]{64}$/i.test(hex)) {
+      throw new InvalidPubkeyError(hex)
+    }
+    return new Pubkey(hex)
+  }
+
+  static fromNpub(npub: string): Pubkey {
+    const decoded = nip19.decode(npub)
+    if (decoded.type !== 'npub') {
+      throw new InvalidPubkeyError(npub)
+    }
+    return new Pubkey(decoded.data)
+  }
+
+  toHex(): string { return this.value }
+  toNpub(): string { return nip19.npubEncode(this.value) }
+
+  equals(other: Pubkey): boolean {
+    return this.value === other.value
+  }
+}
+```
+
+```typescript
+// src/domain/relay/RelayUrl.ts
+export class RelayUrl {
+  private constructor(private readonly value: string) {}
+
+  static create(url: string): RelayUrl {
+    const normalized = normalizeRelayUrl(url)
+    if (!isValidRelayUrl(normalized)) {
+      throw new InvalidRelayUrlError(url)
+    }
+    return new RelayUrl(normalized)
+  }
+
+  toString(): string { return this.value }
+
+  equals(other: RelayUrl): boolean {
+    return this.value === other.value
+  }
+}
+```
+
+3. **Create rich domain entities:**
+
+```typescript
+// src/domain/social/FollowList.ts
+export class FollowList {
+  private constructor(
+    private readonly _ownerPubkey: Pubkey,
+    private _following: Set<string>,
+    private _petnames: Map<string, string>
+  ) {}
+
+  static empty(owner: Pubkey): FollowList {
+    return new FollowList(owner, new Set(), new Map())
+  }
+
+  static fromEvent(event: Event): FollowList {
+    // Reconstitute from Nostr event
+  }
+
+  follow(pubkey: Pubkey): FollowListUpdated {
+    if (pubkey.equals(this._ownerPubkey)) {
+      throw new CannotFollowSelfError()
+    }
+    if (this._following.has(pubkey.toHex())) {
+      return FollowListUpdated.noChange()
+    }
+    this._following.add(pubkey.toHex())
+    return FollowListUpdated.added(pubkey)
+  }
+
+  unfollow(pubkey: Pubkey): FollowListUpdated {
+    if (!this._following.has(pubkey.toHex())) {
+      return FollowListUpdated.noChange()
+    }
+    this._following.delete(pubkey.toHex())
+    return FollowListUpdated.removed(pubkey)
+  }
+
+  isFollowing(pubkey: Pubkey): boolean {
+    return this._following.has(pubkey.toHex())
+  }
+
+  toDraftEvent(): TDraftEvent {
+    // Convert to publishable event
+  }
+}
+```
+
+### 5.2 Phase 2: Introduce Domain Services (Medium Risk)
+
+**Goal:** Extract business logic from providers into domain services.
+
+**Actions:**
+
+1. **Create domain services for cross-aggregate operations:**
+
+```typescript
+// src/domain/content/PublishingService.ts
+export class PublishingService {
+  constructor(
+    private readonly relaySelector: RelaySelector,
+    private readonly signer: ISigner
+  ) {}
+
+  async publishNote(
+    content: string,
+    mentions: Pubkey[],
+    replyTo?: EventId
+  ): Promise<PublishedNote> {
+    const note = Note.create(content, mentions, replyTo)
+    const relays = await this.relaySelector.selectForPublishing(note)
+    const signedEvent = await this.signer.signEvent(note.toDraftEvent())
+
+    return new PublishedNote(signedEvent, relays)
+  }
+}
+```
+
+```typescript
+// src/domain/relay/RelaySelector.ts
+export class RelaySelector {
+  constructor(
+    private readonly userRelayList: RelayList,
+    private readonly mentionRelayResolver: MentionRelayResolver
+  ) {}
+
+  async selectForPublishing(note: Note): Promise<RelayUrl[]> {
+    const writeRelays = this.userRelayList.writeRelays()
+    const mentionRelays = await this.resolveMentionRelays(note.mentions)
+
+    return this.mergeAndDeduplicate(writeRelays, mentionRelays)
+  }
+}
+```
+
+2. **Refactor providers to use domain services:**
+
+```typescript
+// src/providers/ContentProvider.tsx (refactored)
+export function ContentProvider({ children }: Props) {
+  const { signer, relayList } = useNostr()
+
+  // Domain service instantiation
+  const publishingService = useMemo(
+    () => new PublishingService(
+      new RelaySelector(relayList, new MentionRelayResolver()),
+      signer
+    ),
+    [signer, relayList]
+  )
+
+  const publishNote = useCallback(async (content: string, mentions: string[]) => {
+    const pubkeys = mentions.map(Pubkey.fromHex)
+    const result = await publishingService.publishNote(content, pubkeys)
+    // Update UI state
+  }, [publishingService])
+
+  return (
+    <ContentContext.Provider value={{ publishNote }}>
+      {children}
+    </ContentContext.Provider>
+  )
+}
+```
+
+### 5.3 Phase 3: Define Aggregate Boundaries (Higher Risk)
+
+**Goal:** Establish clear aggregate roots with transactional boundaries.
+
+**Proposed Aggregates:**
+
+| Aggregate Root | Child Entities | Invariants |
+|----------------|----------------|------------|
+| `UserProfile` | Profile metadata | NIP-05 validation |
+| `FollowList` | Follow entries, petnames | No self-follow, unique entries |
+| `MuteList` | Public mutes, private mutes | Encryption for private |
+| `RelaySet` | Relay URLs, names | Valid URLs, unique within set |
+| `Bookmark` | Bookmarked events | Unique event references |
+
+**Implementation:**
+
+```typescript
+// src/domain/social/FollowList.ts (Aggregate Root)
+export class FollowList {
+  private _domainEvents: DomainEvent[] = []
+
+  follow(pubkey: Pubkey): void {
+    // Invariant enforcement
+    this.ensureNotSelf(pubkey)
+    this.ensureNotAlreadyFollowing(pubkey)
+
+    this._following.add(pubkey.toHex())
+
+    // Raise domain event
+    this._domainEvents.push(
+      new UserFollowed(this._ownerPubkey, pubkey, new Date())
+    )
+  }
+
+  pullDomainEvents(): DomainEvent[] {
+    const events = [...this._domainEvents]
+    this._domainEvents = []
+    return events
+  }
+}
+```
+
+### 5.4 Phase 4: Introduce Repositories (Higher Risk)
+
+**Goal:** Abstract persistence behind domain-focused interfaces.
+
+```typescript
+// src/domain/social/FollowListRepository.ts (Interface in domain)
+export interface FollowListRepository {
+  findByOwner(pubkey: Pubkey): Promise<FollowList | null>
+  save(followList: FollowList): Promise<void>
+}
+
+// src/infrastructure/persistence/IndexedDbFollowListRepository.ts
+export class IndexedDbFollowListRepository implements FollowListRepository {
+  constructor(
+    private readonly indexedDb: IndexedDbService,
+    private readonly clientService: ClientService
+  ) {}
+
+  async findByOwner(pubkey: Pubkey): Promise<FollowList | null> {
+    // Check IndexedDB cache
+    const cached = await this.indexedDb.getFollowList(pubkey.toHex())
+    if (cached) {
+      return FollowList.fromEvent(cached)
+    }
+
+    // Fetch from relays
+    const event = await this.clientService.fetchFollowList(pubkey.toHex())
+    if (event) {
+      await this.indexedDb.saveFollowList(event)
+      return FollowList.fromEvent(event)
+    }
+
+    return null
+  }
+
+  async save(followList: FollowList): Promise<void> {
+    const draftEvent = followList.toDraftEvent()
+    // Sign and publish handled by application service
+  }
+}
+```
+
+### 5.5 Phase 5: Event-Driven Architecture (Advanced)
+
+**Goal:** Leverage Nostr's event-sourced nature for cross-context communication.
+
+```typescript
+// src/domain/shared/DomainEvent.ts
+export abstract class DomainEvent {
+  readonly occurredAt: Date = new Date()
+  abstract get eventType(): string
+}
+
+// src/domain/social/events/UserFollowed.ts
+export class UserFollowed extends DomainEvent {
+  constructor(
+    readonly follower: Pubkey,
+    readonly followed: Pubkey,
+    readonly timestamp: Date
+  ) {
+    super()
+  }
+
+  get eventType(): string { return 'social.user_followed' }
+}
+
+// src/application/handlers/UserFollowedHandler.ts
+export class UserFollowedHandler {
+  constructor(
+    private readonly notificationService: NotificationService
+  ) {}
+
+  async handle(event: UserFollowed): Promise<void> {
+    // Cross-context reaction
+    await this.notificationService.notifyNewFollower(
+      event.followed,
+      event.follower
+    )
+  }
+}
+```
+
+---
+
+## 6. Proposed Target Architecture
+
+```
+src/
+├── domain/                     # Core domain logic (no dependencies)
+│   ├── identity/
+│   │   ├── model/
+│   │   │   ├── Account.ts
+│   │   │   ├── Pubkey.ts
+│   │   │   └── Keypair.ts
+│   │   ├── services/
+│   │   │   └── SigningService.ts
+│   │   └── index.ts
+│   ├── social/
+│   │   ├── model/
+│   │   │   ├── FollowList.ts
+│   │   │   ├── MuteList.ts
+│   │   │   └── UserProfile.ts
+│   │   ├── services/
+│   │   │   └── TrustCalculator.ts
+│   │   ├── events/
+│   │   │   ├── UserFollowed.ts
+│   │   │   └── UserMuted.ts
+│   │   └── index.ts
+│   ├── content/
+│   │   ├── model/
+│   │   │   ├── Note.ts
+│   │   │   ├── Reaction.ts
+│   │   │   └── Repost.ts
+│   │   ├── services/
+│   │   │   └── ContentValidator.ts
+│   │   └── index.ts
+│   ├── relay/
+│   │   ├── model/
+│   │   │   ├── RelayUrl.ts
+│   │   │   ├── RelaySet.ts
+│   │   │   └── RelayList.ts
+│   │   ├── services/
+│   │   │   └── RelaySelector.ts
+│   │   └── index.ts
+│   └── shared/
+│       ├── EventId.ts
+│       ├── Timestamp.ts
+│       └── DomainEvent.ts
+│
+├── application/                # Use cases, orchestration
+│   ├── identity/
+│   │   └── AccountService.ts
+│   ├── social/
+│   │   ├── FollowService.ts
+│   │   └── MuteService.ts
+│   ├── content/
+│   │   └── PublishingService.ts
+│   └── handlers/
+│       └── DomainEventHandlers.ts
+│
+├── infrastructure/             # External concerns
+│   ├── persistence/
+│   │   ├── IndexedDbRepository.ts
+│   │   └── LocalStorageRepository.ts
+│   ├── nostr/
+│   │   ├── NostrClient.ts
+│   │   └── RelayPool.ts
+│   ├── signing/
+│   │   ├── NsecSigner.ts
+│   │   ├── Nip07Signer.ts
+│   │   └── BunkerSigner.ts
+│   └── translation/
+│       └── TranslationApiClient.ts
+│
+├── presentation/               # React components
+│   ├── providers/              # Thin wrappers around application services
+│   ├── components/
+│   ├── pages/
+│   └── hooks/
+│
+└── shared/                     # Cross-cutting utilities
+    ├── lib/
+    └── constants/
+```
+
+---
+
+## 7. Migration Strategy
+
+### 7.1 Incremental Approach
+
+1. **Week 1-2:** Create `domain/shared/` with Value Objects (Pubkey, RelayUrl, EventId)
+2. **Week 3-4:** Migrate one bounded context (recommend: Social Graph)
+3. **Week 5-6:** Add domain services, refactor related providers
+4. **Week 7-8:** Introduce repositories for the migrated context
+5. **Ongoing:** Repeat for remaining contexts
+
+### 7.2 Coexistence Strategy
+
+During migration, old and new code can coexist:
+
+```typescript
+// Adapter to bridge old and new
+export function legacyPubkeyToDomain(pubkey: string): Pubkey {
+  return Pubkey.fromHex(pubkey)
+}
+
+export function domainPubkeyToLegacy(pubkey: Pubkey): string {
+  return pubkey.toHex()
+}
+```
+
+### 7.3 Testing Strategy
+
+- Unit test domain objects in isolation
+- Integration test application services
+- Keep existing component tests as regression safety
+
+---
+
+## 8. Metrics for Success
+
+| Metric | Current State | Target State |
+|--------|---------------|--------------|
+| Domain logic in providers | ~60% | <10% |
+| Value Objects usage | 0 | 15+ types |
+| Explicit aggregates | 0 | 5 aggregates |
+| Domain events | 0 (implicit) | 10+ event types |
+| Repository interfaces | 0 | 5 repositories |
+| Test coverage (domain) | N/A | >80% |
+
+---
+
+## 9. Risks and Mitigations
+
+| Risk | Probability | Impact | Mitigation |
+|------|-------------|--------|------------|
+| Breaking changes during migration | Medium | High | Incremental migration, adapter layer |
+| Performance regression | Low | Medium | Benchmark critical paths, optimize lazily |
+| Team learning curve | Medium | Medium | Documentation, pair programming |
+| Over-engineering | Medium | Medium | YAGNI principle, concrete before abstract |
+
+---
+
+## 10. Conclusion
+
+The Smesh codebase has a solid foundation that can be evolved toward DDD principles. The key recommendations are:
+
+1. **Immediate:** Introduce Value Objects for Pubkey, RelayUrl, EventId
+2. **Short-term:** Create rich domain entities with behavior
+3. **Medium-term:** Extract domain services from providers
+4. **Long-term:** Full bounded context separation with repositories
+
+The Nostr protocol's event-sourced nature is a natural fit for DDD, and the existing type definitions provide a starting point for a rich domain model. The main effort will be moving from an anemic model to entities with behavior, and establishing clear aggregate boundaries.
+
+---
+
+*Generated: December 2024*
+*Analysis based on DDD principles from Eric Evans and Vaughn Vernon*