Session folder/grouping ("Planner" sidebar) partially lost after desktop app update

Environment

• App: Claude desktop app (Windows), version 2.1.222
• OS: Windows 11 Pro

What happened
Before updating the desktop app, my sessions were organized into custom
folders/categories in a sidebar "Planner" view. After the update, most of
that organization was lost: sessions that used to live inside a folder are
now listed flat/ungrouped, while a few folders kept some of their sessions
(inconsistent, partial loss — not a full reset).

What was NOT affected
All underlying sessions/conversations are fully intact — titles, content,
and history are unchanged. Only the folder/grouping assignment (a UI-level
organization layer) was affected.

What I checked
Together with Claude Code, we searched for the storage location of this
folder/grouping data to see if it could be restored from a local file:

• %APPDATA%\Claude\config.json and per-session JSON files

(claude-code-sessions\...) — no folder/group field present

• %APPDATA%\Claude\Local Storage and IndexedDB — no plain-text trace found
• ~/.claude (backups, session-env, sessions, projects) — no trace either

This suggests the grouping data lives in an internal store that isn't
plainly recoverable from the files above, and that it didn't survive the
update cleanly for all sessions.

Request

• Could this data loss be investigated/fixed for a future update?
• Is there a supported way to back up or export this folder/grouping

organization, so it survives future updates?