fix: paginate chat detail messages

ai_knowledge_base_v2/apps/backend/app/api/admin_records.py

@@ -83,6 +83,8 @@ def export_chats(
 @router.get("/chat/{session_id}")
 def chat_detail(
     session_id: int,
+    messagePage: int = Query(default=1, ge=1),
+    messagePageSize: int = Query(default=20, ge=10, le=100),
     db: Session = Depends(get_db),
     current_admin: Admin = Depends(get_current_admin),
 ) -> dict:
@@ -97,10 +99,13 @@ def chat_detail(
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="会话不存在")
 
     session, user = session_row
+    message_query = select(ChatMessage).where(ChatMessage.session_id == session_id)
+    message_total = db.scalar(select(func.count()).select_from(message_query.subquery())) or 0
     messages = db.scalars(
-        select(ChatMessage)
-        .where(ChatMessage.session_id == session_id)
+        message_query
         .order_by(ChatMessage.created_at.asc(), ChatMessage.id.asc())
+        .offset((messagePage - 1) * messagePageSize)
+        .limit(messagePageSize)
     ).all()
     ai_logs = db.scalars(
         select(AiRequestLog)
@@ -111,6 +116,12 @@ def chat_detail(
         {
             "session": _chat_row_dict(session, user),
             "messages": [_message_dict(item) for item in messages],
+            "messagesPage": page_result(
+                [_message_dict(item) for item in messages],
+                total=message_total,
+                page=messagePage,
+                page_size=messagePageSize,
+            ),
             "aiLogs": [_ai_log_dict(item, include_prompt=True) for item in ai_logs],
         }
     )