Session history lost after updating to v1.1.4328

Preflight Checklist

• [x] I have searched existing issues 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?

After updating Claude Code to version 1.1.4328 (d8e391, 2026-02-25), all session history
disappeared from the left-side session panel. This occurred on both my desktop and laptop
after the update.

What Should Happen?

Session history should be preserved across updates.

Error Messages/Logs

Steps to Reproduce

1. Had existing sessions visible in the right-side session panel
2. Updated Claude Code to v1.1.4328
3. All previous sessions are gone from the panel

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code version: 1.1.4328 (d8e391) 2026-02-25T17:04:36.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Investigation

The session metadata directory (~/Library/Application Support/Claude/claude-code-sessions/)
now uses nested UUID subdirectories. Only sessions created after the update are present.
The corresponding JSONL conversation logs in ~/.claude/projects/ are also missing for
pre-update sessions.

It appears the update either cleared the session index or changed the directory structure
without migrating existing sessions.