feat(server): add created timestamp to history (#6607)

packages/backend/server/src/plugins/copilot/session.ts

@@ -318,6 +318,7 @@ export class ChatSessionService {
         select: {
           id: true,
           promptName: true,
+          createdAt: true,
           messages: {
             select: {
               role: true,
@@ -335,7 +336,7 @@ export class ChatSessionService {
       })
       .then(sessions =>
         Promise.all(
-          sessions.map(async ({ id, promptName, messages }) => {
+          sessions.map(async ({ id, promptName, messages, createdAt }) => {
             try {
               const ret = PromptMessageSchema.array().safeParse(messages);
               if (ret.success) {
@@ -357,6 +358,7 @@ export class ChatSessionService {
                   sessionId: id,
                   action: prompt.action || undefined,
                   tokens,
+                  createdAt,
                   messages: preload.concat(ret.data),
                 };
               } else {