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import OpenAI from 'openai';
            import { ChatHistory } from './models';

            // RAG-powered chat endpoint
            app.post('/api/chat', async (req, res) => {
              const { message, userId } = req.body;

              // Retrieve context from vector DB
              const context = await retrieveContext(message);

              const completion = await openai.chat.completions
                .create({
                  model: 'gpt-4o',
                  messages: [
                    { role: 'system', content: context },
                    { role: 'user',   content: message }
                  ],
                  stream: true
                });

              // Stream response to React client
              for await (const chunk of completion) {
                res.write(chunk.choices[0]?.delta?.content);
              }
              res.end();
            });