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@morlay/session-branch

Session Branch

Provider abstraction + high-level service for rewind / retry / fork over DeepSeek Harness event-sourced sessions.

The plugin will be installed here. Keep web if you are unsure.

npx -y @deepseek-ai/dsh plugin --profile web add @morlay/session-branch@0.0.11
READMECompatibilityVersions

Compatibility and provenance

Session Branch is published as @morlay/session-branch and currently resolves to version 0.0.11. The Hub verifies its manifest and preserves the exact installation source for reproducible installs.

DSH compatibility
*
Runtime surfaces
any
Release source
npm
Registry updated
11/4/2026

Versions

0.0.8stable
9/14/2026
0.0.7stable
9/13/2026
0.0.6stable
9/11/2026
0.0.11stable
8/27/2026
Show 19 more versionsCollapse versions
0.0.10-alpha.8prerelease
9/24/2026
0.0.10-alpha.7prerelease
9/23/2026
0.0.10-alpha.6prerelease
9/22/2026
0.0.10-alpha.5prerelease
9/20/2026
0.0.10-alpha.4prerelease
9/20/2026
0.0.10-alpha.3prerelease
9/18/2026
0.0.10-alpha.2prerelease
9/18/2026
0.0.9-alpha.1prerelease
9/18/2026
0.0.9-alpha.0prerelease
9/18/2026
0.0.5stable
9/10/2026
0.0.4stable
9/10/2026
0.0.4-alpha.4prerelease
9/10/2026
0.0.4-alpha.2prerelease
9/8/2026
0.0.4-alpha.1prerelease
9/8/2026
0.0.4-alpha.0prerelease
9/8/2026
0.0.3stable
9/4/2026
0.0.2stable

Related plugins

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Latest
0.0.11
DSH
*
HMR
Process restart
Tree shaking
Safe tree shaking not declared
Unpacked size
52.1 kB
Files
11
Surface
any
License
MIT
Source
npm
GitHub
★ 9
Weekly downloads
2,722
Last push
11/4/2026
View source ↗
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Report an issue
9/3/2026
0.0.10stable
8/20/2026
0.0.9stable
8/20/2026

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README

@morlay/session-branch

分支式会话编辑的契约层：定义数据层分支原语 SessionBranchProvider （rewind / forkFrom / readBranchPrefix）、高层服务 SessionBranch （ctx.sessionBranch）与共享的版本树投影 buildTimeline。

与上游 SessionPersistence 的关系

面上游 PersistenceBackend本包 SessionBranchProvider
覆盖持久读写 + 崩溃修复（append-only）显式回退 + 闭合边界派生（分支面）
原语loadStored / appendBatch / commitRepairreadBranchPrefix / forkFrom / rewind
实现方JSONL / RDB 等RDB 等（@morlay/session-rdb 同时实现两者，形成闭环）

Provider 抽象

interface SessionBranchProvider {
  readBranchPrefix(id, atSeq?, mode?, signal?): Promise<BranchBoundary>;
  forkFrom(sourceId, options?, signal?): Promise<SessionId>;
  rewind(id, toBoundary, signal?): Promise<SessionPersistenceSnapshot>;
}
  • readBranchPrefix：定位 atSeq 锚定的闭合 turn/end 边界并返回前缀； mode: "after"（包含目标轮，fork 语义）/ "before"（排除目标轮，编辑 / 重掷 / 重试语义）。
  • forkFrom：纯 append——新会话（parentSession / seedLength），seed = 边界前缀 + seedSuffix，不触碰源会话。
  • rewind：唯一改写事件 log 的操作，事务整体提交或回滚；支持 live 会话（内存 log 截断 + 派生缓存复位 + coordinator cursor 同步，见 @morlay/session-rdb 的 SessionBranchRdbProvider）。
  • syncLiveCursor(sessionId)：编排层把 ignorable 版本效果 push 进 live log 后（不发布、不进 write-behind 缓冲），用其对齐 coordinator cursor，避免 后续 append 的 seq 校验错位（默认空实现，rdb 覆写）。

版本树

buildTimeline(snapshots, readOwnEvents, sessionId) 从会话快照（header lineage）+ 每会话自有后缀（seq >= seedLength 的 session-branch/version 事件）投影完整版本树。

版本效果事件携带 ignorable: true（对核心可跳过、不进 canonical log）， live 会话从内存 log 读到效果，cold 会话 timeline 只有 lineage 骨架。

安装

nub install @morlay/session-branch   # peer: @deepseek-ai/cordis, dsh-session, dsh-session-persistence