extend chat model with CRUD actions for event changes

- Add ProposedEventChange type with create/update/delete actions
- Replace proposedEvent with proposedChange in ChatMessage
- Add currentDate to AIContext for time-aware AI responses
- Add AI test endpoint for development (/api/ai/test)
- Fix MongoUserRepository type safety with explicit toUser mapping
- Update CLAUDE.md documentation

CLAUDE.md

@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-**CalChat** is a calendar mobile app with AI support. The core concept is creating calendar events through a chat interface with an AI chatbot (Claude). Users can add, edit, and delete events via natural language conversation.
+**CalChat** is a calendar mobile app with AI support. The core concept is managing calendar events through a chat interface with an AI chatbot. Users can add, edit, and delete events via natural language conversation.
 
 This is a fullstack TypeScript monorepo with npm workspaces.
 
@@ -152,6 +152,7 @@ src/
 - `GET /api/chat/conversations` - Get all conversations (protected)
 - `GET /api/chat/conversations/:id` - Get messages of a conversation with cursor-based pagination (protected)
 - `GET /health` - Health check
+- `POST /api/ai/test` - AI test endpoint (development only)
 
 ### Shared Package (packages/shared)
 
@@ -163,13 +164,15 @@ src/
     ├── User.ts           # User, CreateUserDTO, LoginDTO, AuthResponse
     ├── CalendarEvent.ts  # CalendarEvent, CreateEventDTO, UpdateEventDTO
     └── ChatMessage.ts    # ChatMessage, Conversation, SendMessageDTO, CreateMessageDTO,
-                          # GetMessagesOptions, ChatResponse, ConversationSummary
+                          # GetMessagesOptions, ChatResponse, ConversationSummary,
+                          # ProposedEventChange, EventAction
 ```
 
 **Key Types:**
 - `User`: id, email, displayName, passwordHash?, createdAt?, updatedAt?
 - `CalendarEvent`: id, userId, title, description?, startTime, endTime, note?, isRecurring?, recurrenceRule?
-- `ChatMessage`: id, conversationId, sender ('user' | 'assistant'), content, proposedEvent?
+- `ChatMessage`: id, conversationId, sender ('user' | 'assistant'), content, proposedChange?
+- `ProposedEventChange`: action ('create' | 'update' | 'delete'), eventId?, event?, updates?
 - `Conversation`: id, userId, createdAt?, updatedAt? (messages loaded separately via lazy loading)
 - `CreateEventDTO`: Used for creating events AND for AI-proposed events
 - `GetMessagesOptions`: Cursor-based pagination with `before?: string` and `limit?: number`

apps/server/src/app.ts

@@ -45,6 +45,27 @@ app.get('/health', (_, res) => {
   res.json({ status: 'ok' });
 });
 
+// AI Test endpoint (for development only)
+app.post('/api/ai/test', async (req, res) => {
+  try {
+    const { message } = req.body;
+    if (!message) {
+      res.status(400).json({ error: 'message is required' });
+      return;
+    }
+    const result = await aiProvider.processMessage(message, {
+      userId: 'test-user',
+      conversationHistory: [],
+      existingEvents: [],
+      currentDate: new Date(),
+    });
+    res.json(result);
+  } catch (error) {
+    console.error('AI test error:', error);
+    res.status(500).json({ error: String(error) });
+  }
+});
+
 // Start server
 async function start() {
   try {

apps/server/src/repositories/mongo/MongoUserRepository.ts

@@ -1,19 +1,29 @@
 import { User } from '@caldav/shared';
 import { UserRepository, CreateUserData } from '../../services/interfaces';
-import { UserModel } from './models';
+import { UserModel, UserDocument } from './models';
 
 export class MongoUserRepository implements UserRepository {
+  private toUser(doc: UserDocument): User {
+    return {
+      id: doc._id.toString(),
+      email: doc.email,
+      displayName: doc.displayName,
+      createdAt: doc.createdAt,
+      updatedAt: doc.updatedAt,
+    };
+  }
+
   async findById(id: string): Promise<User | null> {
     throw new Error('Not implemented');
   }
 
   async findByEmail(email: string): Promise<User | null> {
     const user = await UserModel.findOne({ email: email.toLowerCase() });
-    return user ? user.toJSON() as User : null;
+    return user ? this.toUser(user) : null;
   }
 
   async create(data: CreateUserData): Promise<User> {
     const user = await UserModel.create(data);
-    return user.toJSON() as User;
+    return this.toUser(user);
   }
 }

apps/server/src/repositories/mongo/models/ChatModel.ts

@@ -1,10 +1,10 @@
 import mongoose, { Schema, Document } from 'mongoose';
-import { ChatMessage, Conversation, CreateEventDTO } from '@caldav/shared';
+import { ChatMessage, Conversation, CreateEventDTO, UpdateEventDTO, ProposedEventChange } from '@caldav/shared';
 
 export interface ChatMessageDocument extends Omit<ChatMessage, 'id'>, Document {}
 export interface ConversationDocument extends Omit<Conversation, 'id'>, Document {}
 
-const ProposedEventSchema = new Schema<CreateEventDTO>(
+const EventSchema = new Schema<CreateEventDTO>(
   {
     title: { type: String, required: true },
     description: { type: String },
@@ -17,6 +17,29 @@ const ProposedEventSchema = new Schema<CreateEventDTO>(
   { _id: false }
 );
 
+const UpdatesSchema = new Schema<UpdateEventDTO>(
+  {
+    title: { type: String },
+    description: { type: String },
+    startTime: { type: Date },
+    endTime: { type: Date },
+    note: { type: String },
+    isRecurring: { type: Boolean },
+    recurrenceRule: { type: String },
+  },
+  { _id: false }
+);
+
+const ProposedChangeSchema = new Schema<ProposedEventChange>(
+  {
+    action: { type: String, enum: ['create', 'update', 'delete'], required: true },
+    eventId: { type: String },
+    event: { type: EventSchema },
+    updates: { type: UpdatesSchema },
+  },
+  { _id: false }
+);
+
 const ChatMessageSchema = new Schema<ChatMessageDocument>(
   {
     conversationId: {
@@ -32,8 +55,8 @@ const ChatMessageSchema = new Schema<ChatMessageDocument>(
       type: String,
       required: true,
     },
-    proposedEvent: {
-      type: ProposedEventSchema,
+    proposedChange: {
+      type: ProposedChangeSchema,
     },
   },
   {

apps/server/src/services/interfaces/AIProvider.ts

@@ -1,14 +1,15 @@
-import { CalendarEvent, ChatMessage, CreateEventDTO } from '@caldav/shared';
+import { CalendarEvent, ChatMessage, ProposedEventChange } from '@caldav/shared';
 
 export interface AIContext {
   userId: string;
   conversationHistory: ChatMessage[];
   existingEvents: CalendarEvent[];
+  currentDate: Date;
 }
 
 export interface AIResponse {
   content: string;
-  proposedEvent?: CreateEventDTO;
+  proposedChange?: ProposedEventChange;
 }
 
 export interface AIProvider {

package-lock.json

@@ -9568,19 +9568,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/json-schema-to-ts": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/json-schema-to-ts/-/json-schema-to-ts-3.1.1.tgz",
-      "integrity": "sha512-+DWg8jCJG2TEnpy7kOm/7/AxaYoaRbjVB4LFZLySZlWn8exGs3A4OLJR966cVvU26N7X9TWxl+Jsw7dzAqKT6g==",
-      "license": "MIT",
-      "dependencies": {
-        "@babel/runtime": "^7.18.3",
-        "ts-algebra": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=16"
-      }
-    },
     "node_modules/json-schema-traverse": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
@@ -14318,12 +14305,6 @@
       "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==",
       "license": "MIT"
     },
-    "node_modules/ts-algebra": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ts-algebra/-/ts-algebra-2.0.0.tgz",
-      "integrity": "sha512-FPAhNPFMrkwz76P7cdjdmiShwMynZYN6SgOujD1urY4oNm80Ou9oMdmbR45LotcKOXoy7wSmHkRFE6Mxbrhefw==",
-      "license": "MIT"
-    },
     "node_modules/ts-api-utils": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.1.0.tgz",

packages/shared/src/models/ChatMessage.ts

@@ -1,13 +1,22 @@
-import { CreateEventDTO } from './CalendarEvent';
+import { CreateEventDTO, UpdateEventDTO } from './CalendarEvent';
 
 export type MessageSender = 'user' | 'assistant';
 
+export type EventAction = 'create' | 'update' | 'delete';
+
+export interface ProposedEventChange {
+  action: EventAction;
+  eventId?: string;           // Required for update/delete
+  event?: CreateEventDTO;     // Required for create
+  updates?: UpdateEventDTO;   // Required for update
+}
+
 export interface ChatMessage {
   id: string;
   conversationId: string;
   sender: MessageSender;
   content: string;
-  proposedEvent?: CreateEventDTO;
+  proposedChange?: ProposedEventChange;
   createdAt?: Date;
 }
 
@@ -26,7 +35,7 @@ export interface SendMessageDTO {
 export interface CreateMessageDTO {
   sender: MessageSender;
   content: string;
-  proposedEvent?: CreateEventDTO;
+  proposedChange?: ProposedEventChange;
 }
 
 export interface GetMessagesOptions {