[BUG] I lost all the conversation sessions I had.

### Preflight Checklist

- [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code

### What's Wrong?

I logged into Claude today and was asked to sign in again; when I got in, I had lost all my chats—it was as if the app had reset—and I lost over 10 chats.

### What Should Happen?

opening the app and finding all my chats there, as usual

### Error Messages/Logs

```shell

```

### Steps to Reproduce

Open the app and log in again.

### Claude Model

Not sure / Multiple models

### Is this a regression?

Yes, this worked in a previous version

### Last Working Version

_No response_

### Claude Code Version

1.52386.6

### Platform

Anthropic API

### Operating System

Windows

### Terminal/Shell

Terminal.app (macOS)

### Additional Information

_No response_

No files, tests, or code entry points are named. Start by reproducing the sign-in flow on Windows with Claude Code 1.52386.6 and inspect whether existing conversation sessions remain available afterward. Done means chats persist across re-authentication without data loss.

Written by the indexing model from the issue text.