feat(api): 添加对话数据导出和清除 API

- 新增 GET /api/conversations/export 导出所有对话数据
- 新增 GET /api/conversations/all 获取对话统计信息
- 新增 DELETE /api/conversations/all 清除所有对话和消息

src/app/api/conversations/all/route.ts

@@ -0,0 +1,52 @@
+import { NextResponse } from 'next/server';
+import { db } from '@/drizzle/db';
+import { conversations, messages } from '@/drizzle/schema';
+import { sql } from 'drizzle-orm';
+
+// GET /api/conversations/all - 获取统计信息
+export async function GET() {
+  try {
+    // 获取对话数量
+    const conversationCount = await db
+      .select({ count: sql<number>`count(*)` })
+      .from(conversations);
+
+    // 获取消息数量
+    const messageCount = await db
+      .select({ count: sql<number>`count(*)` })
+      .from(messages);
+
+    return NextResponse.json({
+      conversationCount: Number(conversationCount[0]?.count || 0),
+      messageCount: Number(messageCount[0]?.count || 0),
+    });
+  } catch (error) {
+    console.error('Failed to get stats:', error);
+    return NextResponse.json(
+      { error: 'Failed to get stats' },
+      { status: 500 }
+    );
+  }
+}
+
+// DELETE /api/conversations/all - 清除所有对话和消息
+export async function DELETE() {
+  try {
+    // 先删除所有消息
+    await db.delete(messages);
+
+    // 再删除所有对话
+    await db.delete(conversations);
+
+    return NextResponse.json({
+      success: true,
+      message: 'All conversations and messages have been deleted',
+    });
+  } catch (error) {
+    console.error('Failed to delete all conversations:', error);
+    return NextResponse.json(
+      { error: 'Failed to delete all conversations' },
+      { status: 500 }
+    );
+  }
+}

src/app/api/conversations/export/route.ts

@@ -0,0 +1,73 @@
+import { NextResponse } from 'next/server';
+import { db } from '@/drizzle/db';
+import { conversations, messages } from '@/drizzle/schema';
+import { desc, eq } from 'drizzle-orm';
+
+// GET /api/conversations/export - 导出所有对话数据
+export async function GET() {
+  try {
+    // 获取所有对话
+    const allConversations = await db.query.conversations.findMany({
+      orderBy: [desc(conversations.createdAt)],
+    });
+
+    // 获取所有消息
+    const allMessages = await db.query.messages.findMany({
+      orderBy: [desc(messages.createdAt)],
+    });
+
+    // 按对话组织数据
+    const exportData = {
+      exportedAt: new Date().toISOString(),
+      version: '1.0',
+      totalConversations: allConversations.length,
+      totalMessages: allMessages.length,
+      conversations: allConversations.map((conv) => {
+        // 获取该对话的所有消息
+        const convMessages = allMessages
+          .filter((msg) => msg.conversationId === conv.conversationId)
+          .sort((a, b) => new Date(a.createdAt!).getTime() - new Date(b.createdAt!).getTime())
+          .map((msg) => ({
+            messageId: msg.messageId,
+            role: msg.role,
+            content: msg.content,
+            thinkingContent: msg.thinkingContent,
+            toolCalls: msg.toolCalls,
+            toolResults: msg.toolResults,
+            inputTokens: msg.inputTokens,
+            outputTokens: msg.outputTokens,
+            status: msg.status,
+            feedback: msg.feedback,
+            createdAt: msg.createdAt,
+          }));
+
+        return {
+          conversationId: conv.conversationId,
+          title: conv.title,
+          summary: conv.summary,
+          model: conv.model,
+          tools: conv.tools,
+          enableThinking: conv.enableThinking,
+          systemPrompt: conv.systemPrompt,
+          temperature: conv.temperature,
+          messageCount: conv.messageCount,
+          totalTokens: conv.totalTokens,
+          isArchived: conv.isArchived,
+          isPinned: conv.isPinned,
+          createdAt: conv.createdAt,
+          updatedAt: conv.updatedAt,
+          lastMessageAt: conv.lastMessageAt,
+          messages: convMessages,
+        };
+      }),
+    };
+
+    return NextResponse.json(exportData);
+  } catch (error) {
+    console.error('Failed to export conversations:', error);
+    return NextResponse.json(
+      { error: 'Failed to export conversations' },
+      { status: 500 }
+    );
+  }
+}