[BUG] Windows: Claude Code Desktop app shows sessions in sidebar but all message content missing after auto-update — content not persisted to claude-code-sessions JSONL files

[guan64]

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report (please file separate reports for different bugs)
• I am using the latest version of Claude Code

What's Wrong?

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report
• I am using the latest version of Claude Code

---

Platform: Windows
App: Claude Code Desktop
Area: Session persistence / Desktop app

---

What's Wrong?

After the Claude Code Desktop app auto-updated, all session message content
disappeared. The session list in the left sidebar still shows all previous
sessions correctly, but clicking any session shows "No messages yet." —
even for sessions that were actively used.

Reinstalling the app and clearing cache did not fix the issue.

---

Steps to Reproduce

1. Use Claude Code Desktop on Windows over multiple sessions
2. App auto-updates in the background
3. Relaunch the app after the update
4. Session titles are visible in the left sidebar
5. Clicking any session shows "No messages yet." — content is gone

---

Expected Behavior

All previous session message content should be visible after an app update.

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Actual Behavior

• Sidebar session list renders correctly (titles intact)
• All session message content is missing ("No messages yet.")
• Cache clear does not fix it
• Full uninstall + reinstall does not fix it
• Running /resume in the Claude Code CLI shows only a small subset
  of sessions, confirming content was never flushed to the
  claude-code-sessions JSONL files on disk
• The JSONL files in %APPDATA%\Claude\claude-code-sessions are all
  only 1KB (empty stubs with no message content)

---

Root Cause (suspected)

The Desktop app (Electron renderer) was storing session message content
in IndexedDB / in-memory cache but never properly flushing it to the
claude-code-sessions JSONL files on disk. When the update cleared the
Electron cache, all message content was permanently lost.

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Impact

Permanent data loss of all session conversation history prior to the update.
Work output files on disk are unaffected, but all conversation transcripts
are gone with no way to recover them.

---

Additional Context

• %APPDATA%\Claude\claude-code-sessions contains JSONL files all sized 1KB
• %APPDATA%\Claude\DIPS-wal was 910KB at time of investigation (WAL not checkpointed)
• Claude Code CLI /resume only shows sessions from AFTER the update
• Issue persists across reinstall, confirming it is a data persistence
  bug and not an Electron cache issue

What Should Happen?

NA

Error Messages/Logs

no error msg

Steps to Reproduce

NA

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

latest

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response

[github-actions]

Found 3 possible duplicate issues:

1. [BUG] All sessions lost after Claude Desktop update on Windows (data intact on disk) #38691
2. [BUG] Desktop App 2.1.111 upgrade: Code session index wiped (recoverable via workaround); Cowork history disappeared (cause unclear) #51412
3. Resumed sessions silently stop writing to session JSONL after claude.exe version upgrade #53417

This issue will be automatically closed as a duplicate in 3 days.

• If your issue is a duplicate, please close it and 👍 the existing issue instead
• To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

[guan64]

my issue is different as my chat history really got wiped out and i have no idea how it was all wiped out

[BasedGPT]

Adding a related diagnostic distinction from #56172 that may help triage/recovery here.

When Desktop shows session titles/sidebar entries but the pane is empty or says there are no messages, there are at least two materially different cases:

metadata local_*.json exists, cliSessionId missing → potentially recoverable by backfilling cliSessionId from the matching ~/.claude/projects/*.jsonl
metadata local_*.json has cliSessionId, but the referenced JSONL is missing or only a tiny stub → likely true transcript loss

For this report, the 1KB stubs suggest it may be the second bucket rather than the recoverable cliSessionId case, but checking the cliSessionId field in %APPDATA%\Claude\claude-code-sessions\<acct>\<org>\local_*.json is a quick way to avoid conflating the two.

Before touching any metadata files: fully quit Claude Desktop, including the tray process. Desktop holds metadata in memory and flushes back to disk — changes made while it's running get silently overwritten. Verify with tasklist /FI "IMAGENAME eq claude.exe" before proceeding.

---

Fix: cliSessionId-missing case

Step 1 — Diagnose

import glob, json, os
META = os.path.expandvars(r'%APPDATA%\Claude\claude-code-sessions\<account-uuid>\<org-uuid>')

broken = []
for f in glob.glob(os.path.join(META, 'local_*.json')):
    with open(f, 'r', encoding='utf-8') as fh:
        d = json.load(fh)
    if not d.get('cliSessionId'):
        broken.append((os.path.basename(f), d.get('title', '<no title>')))

print(f'{len(broken)} metadata files missing cliSessionId:')
for name, title in broken:
    print(f'  {name}  |  {title}')

Step 2 — Repair

Match each broken metadata file to its JSONL by timestamp (first-record timestamp within ±30s of metadata createdAt — deterministic in practice), then backfill cliSessionId. Run without --apply first to review matches.

import argparse, glob, json, os, shutil
from datetime import datetime, timezone

META = os.path.expandvars(r'%APPDATA%\Claude\claude-code-sessions\<account-uuid>\<org-uuid>')
PROJECTS = os.path.expanduser(r'~\.claude\projects')
SLUG_PREFIX = '<your-project-slug>'  # e.g. C--Users-You-Projects-MyApp
BACKUP_DIR = './repair-backup'
WINDOW_MS = 30_000


def index_jsonls():
    out = {}
    for entry in os.listdir(PROJECTS):
        if not entry.startswith(SLUG_PREFIX):
            continue
        slug_dir = os.path.join(PROJECTS, entry)
        for f in glob.glob(os.path.join(slug_dir, '*.jsonl')):
            sid = os.path.splitext(os.path.basename(f))[0]
            if len(sid) != 36:
                continue
            try:
                with open(f, 'r', encoding='utf-8') as fh:
                    first = json.loads(fh.readline())
                ts = first.get('timestamp')
                if ts:
                    dt = datetime.fromisoformat(ts.replace('Z', '+00:00'))
                    out[sid] = int(dt.timestamp() * 1000)
            except (OSError, json.JSONDecodeError, ValueError):
                continue
    return out


def find_match(created_at, jsonls):
    best = None
    for cli, jsonl_ts in jsonls.items():
        delta = abs(jsonl_ts - created_at)
        if delta < WINDOW_MS and (best is None or delta < best[1]):
            best = (cli, delta)
    return best


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('--apply', action='store_true')
    args = parser.parse_args()

    os.makedirs(BACKUP_DIR, exist_ok=True)
    jsonls = index_jsonls()
    repaired = 0

    for f in glob.glob(os.path.join(META, 'local_*.json')):
        with open(f, 'r', encoding='utf-8') as fh:
            d = json.load(fh)
        if d.get('cliSessionId'):
            continue
        match = find_match(d.get('createdAt', 0), jsonls)
        if not match:
            print(f'NO MATCH: {os.path.basename(f)}')
            continue
        cli, delta = match
        print(f'MATCH ({delta}ms): {os.path.basename(f)} -> {cli}')
        if args.apply:
            shutil.copy2(f, os.path.join(BACKUP_DIR, os.path.basename(f)))
            d['cliSessionId'] = cli
            with open(f, 'w', encoding='utf-8') as fh:
                json.dump(d, fh, indent=2)
            repaired += 1

    print(f'\n{"Repaired" if args.apply else "Would repair"} {repaired} files.')


if __name__ == '__main__':
    main()

After running with --apply, relaunch Desktop — repaired sessions should render correctly.

This won't help the second bucket (stub JSONL / genuine data loss). But if the JSONL content is on disk and only the pointer is missing, this fixes it.

[Heathenlamb]

This happened to me ... Sidebar projects all still exists in Claude Code Desktop but ALL content form chats completely wiped.

[Dianov063]

Affected on Windows 11, Claude Code v2.1.128 (desktop).
Lost session history for 10+ active projects after auto-update.
Months of accumulated context across parallel builds — gone.
Max subscriber. No warning, no migration prompt, no recovery path.

Sessions show in sidebar with correct titles but "No messages yet"
when opened. New empty .jsonl files created on first interaction,
old history nowhere on disk.

This is unacceptable for a paid product. Requesting:

1. Server-side recovery if any session telemetry was retained
2. Immediate rollback option to pre-2.1.128 storage format
3. Refund/credit for affected billing period