refactor(evolution): use API instead of shared database tables

Breaking change: evolution-service no longer directly accesses
conversations and messages tables.

Changes:
- Add internal API endpoints to conversation-service for service-to-service calls
- Create ConversationClient in evolution-service to call conversation-service API
- Remove ConversationORM and MessageORM from evolution-service
- Update evolution.service to use ConversationClient

This follows microservices best practices:
- Each service owns its data
- Services communicate via API, not shared tables

TODO: Apply same pattern to system_experiences (knowledge-service)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/services/conversation-service/src/conversation/conversation.module.ts

@@ -4,11 +4,12 @@ import { ConversationEntity } from '../domain/entities/conversation.entity';
 import { MessageEntity } from '../domain/entities/message.entity';
 import { ConversationService } from './conversation.service';
 import { ConversationController } from './conversation.controller';
+import { InternalConversationController } from './internal.controller';
 import { ConversationGateway } from './conversation.gateway';
 
 @Module({
   imports: [TypeOrmModule.forFeature([ConversationEntity, MessageEntity])],
-  controllers: [ConversationController],
+  controllers: [ConversationController, InternalConversationController],
   providers: [ConversationService, ConversationGateway],
   exports: [ConversationService],
 })

packages/services/conversation-service/src/conversation/internal.controller.ts

@@ -0,0 +1,105 @@
+import { Controller, Get, Query, Param } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository, MoreThan, LessThan } from 'typeorm';
+import { ConversationEntity } from '../domain/entities/conversation.entity';
+import { MessageEntity } from '../domain/entities/message.entity';
+
+/**
+ * 内部 API - 供其他微服务调用
+ * 不暴露给外部用户
+ */
+@Controller('internal/conversations')
+export class InternalConversationController {
+  constructor(
+    @InjectRepository(ConversationEntity)
+    private conversationRepo: Repository<ConversationEntity>,
+    @InjectRepository(MessageEntity)
+    private messageRepo: Repository<MessageEntity>,
+  ) {}
+
+  /**
+   * 查询对话列表（供 evolution-service 使用）
+   */
+  @Get()
+  async findConversations(
+    @Query('status') status?: string,
+    @Query('hoursBack') hoursBack?: string,
+    @Query('minMessageCount') minMessageCount?: string,
+    @Query('limit') limit?: string,
+  ) {
+    const queryBuilder = this.conversationRepo.createQueryBuilder('c');
+
+    if (status) {
+      queryBuilder.andWhere('c.status = :status', { status });
+    }
+
+    if (hoursBack) {
+      const cutoffTime = new Date();
+      cutoffTime.setHours(cutoffTime.getHours() - parseInt(hoursBack));
+      queryBuilder.andWhere('c.created_at > :cutoffTime', { cutoffTime });
+    }
+
+    if (minMessageCount) {
+      queryBuilder.andWhere('c.message_count > :minCount', {
+        minCount: parseInt(minMessageCount),
+      });
+    }
+
+    queryBuilder.orderBy('c.created_at', 'DESC');
+
+    if (limit) {
+      queryBuilder.take(parseInt(limit));
+    }
+
+    const conversations = await queryBuilder.getMany();
+
+    return {
+      success: true,
+      data: conversations,
+    };
+  }
+
+  /**
+   * 获取对话的消息（供 evolution-service 使用）
+   */
+  @Get(':id/messages')
+  async getMessages(@Param('id') conversationId: string) {
+    const messages = await this.messageRepo.find({
+      where: { conversationId },
+      order: { createdAt: 'ASC' },
+    });
+
+    return {
+      success: true,
+      data: messages,
+    };
+  }
+
+  /**
+   * 统计对话数量（供 evolution-service 使用）
+   */
+  @Get('count')
+  async countConversations(
+    @Query('status') status?: string,
+    @Query('daysBack') daysBack?: string,
+  ) {
+    const queryBuilder = this.conversationRepo.createQueryBuilder('c');
+
+    if (status) {
+      queryBuilder.andWhere('c.status = :status', { status });
+    }
+
+    if (daysBack) {
+      const cutoffTime = new Date();
+      cutoffTime.setDate(cutoffTime.getDate() - parseInt(daysBack));
+      queryBuilder.andWhere('c.updated_at > :cutoffTime', { cutoffTime });
+    }
+
+    const count = await queryBuilder.getCount();
+
+    return {
+      success: true,
+      data: { count },
+    };
+  }
+}

packages/services/evolution-service/src/evolution/evolution.module.ts

@@ -3,22 +3,20 @@ import { TypeOrmModule } from '@nestjs/typeorm';
 import { EvolutionController } from './evolution.controller';
 import { EvolutionService } from './evolution.service';
 import { ExperienceExtractorService } from '../infrastructure/claude/experience-extractor.service';
-import { ConversationORM } from '../infrastructure/database/entities/conversation.orm';
-import { MessageORM } from '../infrastructure/database/entities/message.orm';
+import { ConversationClient } from '../infrastructure/clients/conversation.client';
 import { SystemExperienceORM } from '../infrastructure/database/entities/system-experience.orm';
 
 @Module({
   imports: [
-    TypeOrmModule.forFeature([
-      ConversationORM,
-      MessageORM,
-      SystemExperienceORM,
-    ]),
+    // 只保留自己 Bounded Context 的实体
+    TypeOrmModule.forFeature([SystemExperienceORM]),
   ],
   controllers: [EvolutionController],
   providers: [
     EvolutionService,
     ExperienceExtractorService,
+    // 使用 API 客户端访问其他服务的数据
+    ConversationClient,
   ],
   exports: [EvolutionService],
 })

packages/services/evolution-service/src/evolution/evolution.service.ts

@@ -1,9 +1,8 @@
 import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
-import { Repository, MoreThan, LessThan } from 'typeorm';
+import { Repository } from 'typeorm';
 import { ExperienceExtractorService } from '../infrastructure/claude/experience-extractor.service';
-import { ConversationORM } from '../infrastructure/database/entities/conversation.orm';
-import { MessageORM } from '../infrastructure/database/entities/message.orm';
+import { ConversationClient, ConversationDto, MessageDto } from '../infrastructure/clients/conversation.client';
 import { SystemExperienceORM } from '../infrastructure/database/entities/system-experience.orm';
 import { v4 as uuidv4 } from 'uuid';
 
@@ -26,10 +25,7 @@ export interface EvolutionTaskResult {
 @Injectable()
 export class EvolutionService {
   constructor(
-    @InjectRepository(ConversationORM)
-    private conversationRepo: Repository<ConversationORM>,
-    @InjectRepository(MessageORM)
-    private messageRepo: Repository<MessageORM>,
+    private conversationClient: ConversationClient,
     @InjectRepository(SystemExperienceORM)
     private experienceRepo: Repository<SystemExperienceORM>,
     private experienceExtractor: ExperienceExtractorService,
@@ -60,18 +56,12 @@ export class EvolutionService {
     console.log(`[Evolution] Starting task ${taskId}`);
 
     try {
-      // 1. 获取待分析的对话
-      const cutoffTime = new Date();
-      cutoffTime.setHours(cutoffTime.getHours() - hoursBack);
-
-      const conversations = await this.conversationRepo.find({
-        where: {
-          status: 'ENDED',
-          createdAt: MoreThan(cutoffTime),
-          messageCount: MoreThan(minMessageCount),
-        },
-        order: { createdAt: 'DESC' },
-        take: limit,
+      // 1. 通过 API 获取待分析的对话
+      const conversations = await this.conversationClient.findConversations({
+        status: 'ENDED',
+        hoursBack,
+        minMessageCount,
+        limit,
       });
 
       console.log(`[Evolution] Found ${conversations.length} conversations to analyze`);
@@ -81,11 +71,8 @@ export class EvolutionService {
 
       for (const conversation of conversations) {
         try {
-          // 获取对话消息
-          const messages = await this.messageRepo.find({
-            where: { conversationId: conversation.id },
-            order: { createdAt: 'ASC' },
-          });
+          // 通过 API 获取对话消息
+          const messages = await this.conversationClient.getMessages(conversation.id);
 
           // 分析对话
           const analysis = await this.experienceExtractor.analyzeConversation({
@@ -125,8 +112,6 @@ export class EvolutionService {
       const uniqueGaps = [...new Set(allKnowledgeGaps)];
       result.knowledgeGapsFound = uniqueGaps.length;
 
-      // 可以在这里调用知识服务创建待处理的知识缺口任务
-
       console.log(`[Evolution] Task ${taskId} completed:`, result);
 
       if (result.errors.length > 0) {
@@ -219,14 +204,10 @@ export class EvolutionService {
       this.experienceRepo.count({ where: { isActive: true } }),
     ]);
 
-    // 获取最近分析的对话数（过去7天）
-    const weekAgo = new Date();
-    weekAgo.setDate(weekAgo.getDate() - 7);
-    const recentConversations = await this.conversationRepo.count({
-      where: {
-        status: 'ENDED',
-        updatedAt: MoreThan(weekAgo),
-      },
+    // 通过 API 获取最近分析的对话数（过去7天）
+    const recentConversations = await this.conversationClient.countConversations({
+      status: 'ENDED',
+      daysBack: 7,
     });
 
     // 获取经验类型分布

packages/services/evolution-service/src/infrastructure/clients/conversation.client.ts

@@ -0,0 +1,129 @@
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+
+/**
+ * 对话数据传输对象
+ */
+export interface ConversationDto {
+  id: string;
+  userId: string;
+  status: string;
+  title: string;
+  summary: string;
+  category: string;
+  messageCount: number;
+  rating: number;
+  hasConverted: boolean;
+  createdAt: Date;
+  updatedAt: Date;
+}
+
+/**
+ * 消息数据传输对象
+ */
+export interface MessageDto {
+  id: string;
+  conversationId: string;
+  role: 'user' | 'assistant' | 'system';
+  content: string;
+  createdAt: Date;
+}
+
+/**
+ * Conversation Service 客户端
+ * 用于调用 conversation-service 的内部 API
+ */
+@Injectable()
+export class ConversationClient {
+  private readonly baseUrl: string;
+
+  constructor(private configService: ConfigService) {
+    this.baseUrl = this.configService.get<string>(
+      'CONVERSATION_SERVICE_URL',
+      'http://conversation-service:3004',
+    );
+  }
+
+  /**
+   * 查询对话列表
+   */
+  async findConversations(options: {
+    status?: string;
+    hoursBack?: number;
+    minMessageCount?: number;
+    limit?: number;
+  }): Promise<ConversationDto[]> {
+    const params = new URLSearchParams();
+
+    if (options.status) params.append('status', options.status);
+    if (options.hoursBack) params.append('hoursBack', options.hoursBack.toString());
+    if (options.minMessageCount) params.append('minMessageCount', options.minMessageCount.toString());
+    if (options.limit) params.append('limit', options.limit.toString());
+
+    const url = `${this.baseUrl}/api/internal/conversations?${params.toString()}`;
+
+    try {
+      const response = await fetch(url);
+      const data = await response.json();
+
+      if (!data.success) {
+        throw new Error('Failed to fetch conversations');
+      }
+
+      return data.data;
+    } catch (error) {
+      console.error('[ConversationClient] Error fetching conversations:', error);
+      throw error;
+    }
+  }
+
+  /**
+   * 获取对话的消息
+   */
+  async getMessages(conversationId: string): Promise<MessageDto[]> {
+    const url = `${this.baseUrl}/api/internal/conversations/${conversationId}/messages`;
+
+    try {
+      const response = await fetch(url);
+      const data = await response.json();
+
+      if (!data.success) {
+        throw new Error('Failed to fetch messages');
+      }
+
+      return data.data;
+    } catch (error) {
+      console.error('[ConversationClient] Error fetching messages:', error);
+      throw error;
+    }
+  }
+
+  /**
+   * 统计对话数量
+   */
+  async countConversations(options: {
+    status?: string;
+    daysBack?: number;
+  }): Promise<number> {
+    const params = new URLSearchParams();
+
+    if (options.status) params.append('status', options.status);
+    if (options.daysBack) params.append('daysBack', options.daysBack.toString());
+
+    const url = `${this.baseUrl}/api/internal/conversations/count?${params.toString()}`;
+
+    try {
+      const response = await fetch(url);
+      const data = await response.json();
+
+      if (!data.success) {
+        throw new Error('Failed to count conversations');
+      }
+
+      return data.data.count;
+    } catch (error) {
+      console.error('[ConversationClient] Error counting conversations:', error);
+      throw error;
+    }
+  }
+}

packages/services/evolution-service/src/infrastructure/database/entities/conversation.orm.ts

@@ -1,61 +0,0 @@
-import {
-  Entity,
-  Column,
-  PrimaryColumn,
-  CreateDateColumn,
-  UpdateDateColumn,
-} from 'typeorm';
-
-@Entity('conversations')
-export class ConversationORM {
-  @PrimaryColumn('uuid')
-  id: string;
-
-  @Column({ name: 'user_id', nullable: true })
-  userId: string;
-
-  @Column({ length: 20, default: 'ACTIVE' })
-  status: string;
-
-  @Column({ length: 255, nullable: true })
-  title: string;
-
-  @Column('text', { nullable: true })
-  summary: string;
-
-  @Column({ length: 50, nullable: true })
-  category: string;
-
-  @Column({ name: 'message_count', default: 0 })
-  messageCount: number;
-
-  @Column({ name: 'user_message_count', default: 0 })
-  userMessageCount: number;
-
-  @Column({ name: 'assistant_message_count', default: 0 })
-  assistantMessageCount: number;
-
-  @Column({ name: 'total_input_tokens', default: 0 })
-  totalInputTokens: number;
-
-  @Column({ name: 'total_output_tokens', default: 0 })
-  totalOutputTokens: number;
-
-  @Column({ type: 'smallint', nullable: true })
-  rating: number;
-
-  @Column('text', { nullable: true })
-  feedback: string;
-
-  @Column({ name: 'has_converted', default: false })
-  hasConverted: boolean;
-
-  @CreateDateColumn({ name: 'created_at' })
-  createdAt: Date;
-
-  @UpdateDateColumn({ name: 'updated_at' })
-  updatedAt: Date;
-
-  @Column({ name: 'ended_at', nullable: true })
-  endedAt: Date;
-}

packages/services/evolution-service/src/infrastructure/database/entities/message.orm.ts

@@ -1,36 +0,0 @@
-import {
-  Entity,
-  Column,
-  PrimaryColumn,
-  CreateDateColumn,
-} from 'typeorm';
-
-@Entity('messages')
-export class MessageORM {
-  @PrimaryColumn('uuid')
-  id: string;
-
-  @Column({ name: 'conversation_id' })
-  conversationId: string;
-
-  @Column({ length: 20 })
-  role: string;
-
-  @Column({ length: 30, default: 'TEXT' })
-  type: string;
-
-  @Column('text')
-  content: string;
-
-  @Column({ name: 'input_tokens', default: 0 })
-  inputTokens: number;
-
-  @Column({ name: 'output_tokens', default: 0 })
-  outputTokens: number;
-
-  @Column('jsonb', { nullable: true })
-  metadata: Record<string, unknown>;
-
-  @CreateDateColumn({ name: 'created_at' })
-  createdAt: Date;
-}