dsh-session-recovery

Recover deleted/corrupted DeepSeek Harness sessions & memory from raw disk

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🛟 After rm -rf ~/.dsh or file corruption, dsh conversation logs (session.jsonl.zstd) and memory (memory.db) can usually be recovered straight from the raw block device — this repo is a battle-tested manual plus the scripts that made it work.

✨ Features


🧠 Memory recovery	Locate `memory.db` by its `SQLite format 3` header, dump the window, rescue rows via SQLite's official `.recover` (skips corrupt pages, keeps readable data).
💬 Session recovery	Scan disk for zstd frame magic `0xFD2FB528`, cluster frames by disk offset, split sessions at `turn` resets, rebuild official-format `session.jsonl.zstd`.
🔧 Automatic repair	Renumber `seq` contiguously, deep-fix `sourceEventSeqs`/`messageSeqs`, normalize `surfaceOp` — the rebuilt log passes DSH's validation.
🔁 Resume repair	Rebuilt sessions can fail at resume (`invalid persisted inbox splice`, `Messages with role 'tool' must be a response to tool_calls`) — `repair-session.js` (or the `/session-repair` web command) replays DSH's inbox/surface/wire rules and fixes the file.
🛡️ Safe by design	Scripts only read the block device and write to a directory you choose; the original disk is never modified.

🚀 Quick Start

# 1. Stop everything that writes to disk (systemd services, dsh itself)
systemctl stop dsh-web

# 2. Recover memory (SQLite)
node scripts/recover-memory.js /dev/<dev> /tmp/recovered/

# 3. Scan disk for session frames
node scripts/scan-zstd.js /dev/<dev> > /tmp/session-events.jsonl

# 4. Split mixed events into per-session files
node scripts/split-sessions.js /tmp/session-events.jsonl 2026-08-16T07:05:06Z

# 5. Rebuild a session file (official format)
node scripts/rebuild-session.js \
  --input /tmp/sess-A.jsonl \
  --id session-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx \
  --created-at 1786705157736 \
  --cwd /path/to/workspace \
  --out-dir ~/.dsh/sessions/--workspace-encoded--/

# 6. Before resuming: verify/repair the rebuilt session (fixes inbox splice
#    skew, duplicate/orphaned tool results, dangling tool calls)
node scripts/repair-session.js \
  ~/.dsh/sessions/--workspace-encoded--/<session-id>/session.jsonl.zstd --dry-run
node scripts/repair-session.js \
  ~/.dsh/sessions/--workspace-encoded--/<session-id>/session.jsonl.zstd
#   → writes session.jsonl.zstd.repaired (+ .bak-<ts>); review, then replace:
cp ~/.dsh/sessions/--workspace-encoded--/<session-id>/session.jsonl.zstd.repaired \
   ~/.dsh/sessions/--workspace-encoded--/<session-id>/session.jsonl.zstd

📖 Full step-by-step manual (Chinese, with every DSH validation rule and error you may hit): RECOVERY.md

📦 Install as a dsh plugin

Note: primarily a recovery toolkit (scripts + manual); it also installs as a dsh plugin that adds the /session-repair command to the web UI.

From a directory containing this repo (local install, no publish needed):

dsh plugin --profile web add file:/path/to/dsh-session-recovery
systemctl restart dsh-web

Then type in any session in the web UI:

/session-repair --dry-run              # analyze the current session (writes nothing)
/session-repair <session-id-or-path>   # repair → writes .repaired + a backup
/session-repair --apply <id>           # also replace the original file

By default only a new .repaired file plus a backup are written; --apply overwrites the original (refused for the live session hosting the command — run it from another session). Restart dsh-web after applying.

Requires Node 24+ (node:sqlite, node:zlib).

📖 Background

DeepSeek Harness stores its data under ~/.dsh:

~/.dsh/
├── sessions/<workspace-encoded>/<session-id>/session.jsonl.zstd   # conversation log
├── memory/memory.db                                               # dsh-mneme memory
└── storages/workspace.json                                        # workspace registry

The session log is a concatenated stream of zstd frames — one frame per JSONL line (source). That per-line framing is exactly what makes partial recovery possible: even if some frames are overwritten, the intact frames around them still decode independently.

🗂️ Repository Layout

├── RECOVERY.md            # Full recovery manual (Chinese, battle-tested)
├── cordis.patch.yml       # dsh plugin patch (registers /session-repair)
├── docs/
│   ├── awesome-entry.yml  # Ready-to-submit Awesome DSH Plugin list entry
│   └── GITHUB-PUBLISH.md  # Publish & PR checklist
├── lib/
│   ├── index.js           # dsh plugin entry: /session-repair command
│   └── repair.js          # Shared repair core (CLI + plugin)
├── scripts/
│   ├── scan-zstd.js       # Disk scan: find & cluster zstd session frames
│   ├── split-sessions.js  # Split mixed recovered events into per-session files
│   ├── rebuild-session.js # Rebuild official-format session.jsonl.zstd
│   ├── repair-session.js  # Fix rebuilt sessions that fail to resume
│   ├── make-test-fixture.js # Generate damaged samples to test repair offline
│   └── recover-memory.js  # Locate & rescue memory.db (SQLite .recover)
└── package.json           # dsh plugin manifest (dsh.bundle + main entry)

🔖 Topics

dsh-plugin · dsh · deepseek-harness · session-recovery · data-recovery · zstd · sqlite

📄 License

MIT

dsh-session-recovery

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