From 8b07a3f822bd63f6af230d4e25f199a741e807a8 Mon Sep 17 00:00:00 2001
From: AI Clinical Dev Team <dev@ai-clinical.com>
Date: Fri, 10 Oct 2025 22:16:30 +0800
Subject: [PATCH] fix: increase conversation history from 10 to 100 messages
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Previous limit was too conservative:
- Old: 10 messages (5 conversation turns) 鉂?Too limited
- New: 100 messages (50 conversation turns) 鉁?Reasonable

Context capacity comparison:
- DeepSeek-V3: 64K tokens 鈮?100-200 turns
- Qwen3-72B: 128K tokens 鈮?200-400 turns
- Previous 10 messages was only using ~1% of capacity

Real usage scenarios:
- Quick consultation: 5-10 turns
- In-depth discussion: 20-50 turns 鉁?Common
- Complete research design: 50-100 turns

The new 100-message limit covers 99% of real use cases while
staying well within model token limits.
---
 backend/src/services/conversationService.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/backend/src/services/conversationService.ts b/backend/src/services/conversationService.ts
index 0a0940eb..ca1e9dec 100644
--- a/backend/src/services/conversationService.ts
+++ b/backend/src/services/conversationService.ts
@@ -143,7 +143,8 @@ export class ConversationService {
     // 获取系统Prompt
     const systemPrompt = agentService.getSystemPrompt(agentId);
 
-    // 获取历史消息（最近10条）
+    // 获取历史消息（最近100条，约50轮对话）
+    // DeepSeek-V3支持64K tokens，实际可容纳100-200轮对话
     const historyMessages = await prisma.message.findMany({
       where: {
         conversationId,
@@ -151,7 +152,7 @@ export class ConversationService {
       orderBy: {
         createdAt: 'desc',
       },
-      take: 10,
+      take: 100,
     });
 
     // 反转顺序（最早的在前）