Chat & Session History - Quick Reference

🎯 Overview

Implementation guide for chat and session history functionality in Terraphim AI.

📊 Architecture at a Glance

┌─────────────────────────────────────────────────────────────┐
│                      FRONTEND (Svelte)                       │
├─────────────────────────────────────────────────────────────┤
│  SessionList  │  Chat Component  │  Context Manager         │
│  Component    │  (Enhanced)      │  UI                      │
└───────┬───────────────┬────────────────────┬────────────────┘
        │               │                    │
        └───────────────┴────────────────────┘
                        │
        ┌───────────────▼────────────────┐
        │      Svelte Stores             │
        │  - currentConversation         │
        │  - conversationList            │
        │  - Auto-save logic             │
        └───────────────┬────────────────┘
                        │
        ┌───────────────▼────────────────┐
        │   Tauri Commands / HTTP API    │
        └───────────────┬────────────────┘
                        │
┌─────────────────────────────────────────────────────────────┐
│                     BACKEND (Rust)                           │
├─────────────────────────────────────────────────────────────┤
│            ConversationService                               │
│  - CRUD operations                                          │
│  - Search & filtering                                       │
│  - Import/Export                                            │
└───────────────┬─────────────────────────────────────────────┘
                │
        ┌───────▼───────┐
        │  Context      │
        │  Manager      │
        └───────┬───────┘
                │
┌───────────────▼─────────────────────────────────────────────┐
│              PERSISTENCE LAYER                               │
├─────────────────────────────────────────────────────────────┤
│         ConversationPersistence (OpenDAL)                    │
│  ┌─────────┬──────────┬──────────┬─────────────┐           │
│  │ SQLite  │ DashMap  │  Memory  │  S3 (opt)   │           │
│  └─────────┴──────────┴──────────┴─────────────┘           │
└─────────────────────────────────────────────────────────────┘

🔑 Key Components

Backend Components

| Component | Location | Purpose | |-----------|----------|---------| | ConversationService | crates/terraphim_service/src/conversation_service.rs | NEW - Business logic for conversation management | | ConversationPersistence | crates/terraphim_persistence/src/conversation.rs | NEW - Persistence trait and OpenDAL implementation | | ContextManager | crates/terraphim_service/src/context_manager.rs | ENHANCE - Add archive, restore, clone methods | | API Endpoints | terraphim_server/src/api.rs | ENHANCE - Add 8 new REST endpoints | | Tauri Commands | desktop/src-tauri/src/cmd.rs | ENHANCE - Add 9 new commands |

Frontend Components

| Component | Location | Purpose | |-----------|----------|---------| | SessionList.svelte | desktop/src/lib/Chat/SessionList.svelte | NEW - Conversation list with search/filter | | Chat.svelte | desktop/src/lib/Chat/Chat.svelte | ENHANCE - Integrate session management | | Stores | desktop/src/lib/stores.ts | ENHANCE - Add conversation stores, auto-save |

Data Types (Already Exist)

| Type | Location | Purpose | |------|----------|---------| | Conversation | crates/terraphim_types/src/lib.rs:1053 | Full conversation with messages and context | | ConversationSummary | crates/terraphim_types/src/lib.rs:1123 | Lightweight summary for listing | | ChatMessage | crates/terraphim_types/src/lib.rs:981 | Individual message with context | | ContextItem | crates/terraphim_types/src/lib.rs:706 | Context attached to messages |

📋 Implementation Checklist

Phase 1: Backend Foundation ⏱️ 1-2 weeks

[ ] Create ConversationPersistence trait
[ ] Implement OpenDALConversationPersistence
[ ] Create ConversationService with:
- [ ] create_conversation()
- [ ] get_conversation()
- [ ] update_conversation()
- [ ] delete_conversation()
- [ ] list_conversations()
- [ ] search_conversations()
[ ] Add 8 new API endpoints (REST)
[ ] Add 9 new Tauri commands
[ ] Write unit tests (target: 80% coverage)

Phase 2: Frontend UI ⏱️ 2 weeks

[ ] Create SessionList.svelte component
[ ] Add conversation stores to stores.ts
[ ] Implement auto-save with 2s debounce
[ ] Enhance Chat.svelte:
- [ ] Session sidebar toggle
- [ ] Load from currentConversation store
- [ ] Auto-save integration
[ ] Write component tests

Phase 3: Search & Filtering ⏱️ 1 week

[ ] Backend search implementation
[ ] Frontend search UI
[ ] Filter by role, date, tags
[ ] Keyboard shortcuts

Phase 4: Import/Export ⏱️ 1 week

[ ] JSON export endpoint
[ ] JSON import with validation
[ ] Bulk export
[ ] Frontend UI for import/export

Phase 5: Polish ⏱️ 2 weeks

[ ] Performance optimization
[ ] Pagination for messages
[ ] Virtual scrolling
[ ] Analytics dashboard
[ ] Documentation
[ ] E2E tests

🚀 Quick Start Guide

1. Backend Setup

// crates/terraphim_persistence/src/conversation.rs
#[async_trait]
pub trait ConversationPersistence {
    async fn save(&self, conversation: &Conversation) -> Result<()>;
    async fn load(&self, id: &ConversationId) -> Result<Conversation>;
    async fn delete(&self, id: &ConversationId) -> Result<()>;
    async fn list_ids(&self) -> Result<Vec<ConversationId>>;
}

pub struct OpenDALConversationPersistence {
    storage: Arc<DeviceStorage>,
    cache: LruCache<ConversationId, Conversation>,
}

2. Service Layer

// crates/terraphim_service/src/conversation_service.rs
pub struct ConversationService {
    persistence: Arc<Mutex<dyn ConversationPersistence>>,
    context_manager: Arc<Mutex<ContextManager>>,
    cache: LruCache<ConversationId, Conversation>,
}

impl ConversationService {
    pub async fn create_conversation(
        &mut self,
        title: String,
        role: RoleName,
    ) -> Result<Conversation> {
        let conversation = Conversation::new(title, role);
        self.persistence.lock().await.save(&conversation).await?;
        self.cache.put(conversation.id.clone(), conversation.clone());
        Ok(conversation)
    }
}

3. API Endpoints

// terraphim_server/src/api.rs
pub async fn list_conversations(
    Query(params): Query<ListConversationsParams>,
) -> Result<Json<ListConversationsResponse>> {
    let service = get_conversation_service().lock().await;
    let conversations = service.list_conversations(params.into()).await?;
    Ok(Json(ListConversationsResponse { conversations }))
}

4. Frontend Store

// desktop/src/lib/stores.ts
export const currentConversation: Writable<Conversation | null> = writable(null);
export const conversationList: Writable<ConversationSummary[]> = writable([]);

export function setupAutoSave() {
  let saveTimeout: NodeJS.Timeout;
  currentConversation.subscribe(conversation => {
    if (conversation) {
      clearTimeout(saveTimeout);
      saveTimeout = setTimeout(async () => {
        await saveConversation(conversation);
      }, 2000);
    }
  });
}

5. Frontend Component

<!-- desktop/src/lib/Chat/SessionList.svelte -->
<script lang="ts">
  async function loadConversations() {
    const response = $is_tauri
      ? await invoke('list_all_conversations', { limit: 100 })
      : await fetch(`${CONFIG.ServerURL}/conversations?limit=100`).then(r => r.json());
    conversationList.set(response.conversations);
  }
</script>

<div class="session-list">
  {#each $filteredConversations as conversation}
    <div class="session-item" on:click={() => selectConversation(conversation.id)}>
      {conversation.title}
    </div>
  {/each}
</div>

📡 API Reference

REST Endpoints

| Method | Endpoint | Description | |--------|----------|-------------| | GET | /api/conversations | List conversations with pagination | | GET | /api/conversations/:id | Get specific conversation | | POST | /api/conversations | Create new conversation | | PUT | /api/conversations/:id | Update conversation metadata | | DELETE | /api/conversations/:id | Delete conversation | | GET | /api/conversations/search | Search conversations | | POST | /api/conversations/:id/export | Export to JSON | | POST | /api/conversations/import | Import from JSON |

Tauri Commands

| Command | Parameters | Returns | |---------|------------|---------| | list_all_conversations | skip, limit, filter | ListConversationsResponse | | create_new_conversation | title, role | CreateConversationResponse | | load_conversation | conversation_id | GetConversationResponse | | update_conversation_info | conversation_id, title, metadata | UpdateConversationResponse | | delete_conversation_by_id | conversation_id | DeleteConversationResponse | | search_conversation_history | query, limit | SearchConversationsResponse | | export_conversation_to_file | conversation_id, file_path | ExportConversationResponse | | import_conversation_from_file | file_path | ImportConversationResponse | | get_conversation_stats | - | ConversationStatistics |

💾 Storage Structure

conversations/
├── index.json                    # Index of all conversations
├── {uuid-1}.json                # Individual conversation files
├── {uuid-2}.json
├── {uuid-3}.json
└── archive/
    ├── {uuid-archived}.json     # Archived conversations
    └── ...

🧪 Testing Commands

# Backend tests
cargo test --package terraphim_persistence conversation_persistence
cargo test --package terraphim_service conversation_service

# Frontend tests
cd desktop
yarn test:unit SessionList
yarn test:e2e chat-session

# Integration tests
./scripts/test_conversation_integration.sh

🔧 Configuration

No new configuration required! Uses existing:

OpenDAL profiles for persistence
Tauri configuration for desktop
Server configuration for web mode

📚 Related Documentation

Full Specification: docs/specifications/chat-session-history-spec.md
Architecture Docs: docs/architecture/
API Documentation: docs/api/
Types Documentation: crates/terraphim_types/src/lib.rs (lines 979-1377)

🎯 Success Criteria

[ ] Users can create, view, edit, and delete conversations
[ ] Conversations persist across sessions
[ ] Search returns relevant results in < 500ms
[ ] Auto-save works without data loss
[ ] UI is responsive with 100+ conversations
[ ] Export/import maintains data integrity
[ ] 80%+ test coverage for new code
[ ] Zero regressions in existing functionality

📞 Support

For questions or issues during implementation:

Check the full specification document
Review existing ContextManager implementation
Examine terraphim_types for data structures
Refer to OpenDAL documentation for persistence patterns

Quick Ref Version: 1.0.0 Last Updated: 2025-10-05