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feat(admission): 写入准入第一阶段：只计量不拦截（#254） - #305
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthrough新增写入准入第一阶段的计量流程。新建写入会提取会话键和话题锚，并将测量结果写入 Changes写入准入计量
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant MemorySave as memory_save
participant Scope as sessionKeyOf
participant Service as saveWithDedupe
participant Admission as writeAdmission
participant Store as store
MemorySave->>Scope: 提取会话键
MemorySave->>Service: 传入记忆和会话键
Service->>Admission: evaluate(memory, sessionKey)
Admission-->>Service: 返回恒定 allow 的测量结果
Service->>Store: 保存新建记忆
Service->>Admission: record(sessionKey, verdict, memoryId)
Admission->>Store: 保存准入审计行
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The retention regression test protects the intended configuration behavior. No merge-blocking issue is established; merge after normal checks. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@dsh-mneme/src/index.js`:
- Line 273: Move the `deleteOldLlmAudits` cleanup to after `cfg` has been fully
assembled from raw configuration and panel overrides, and use `cfg.llmAudit` for
its enabled and retention settings. Keep the existing retention default and
non-fatal error handling so cleanup matches the configuration used by
`createWriteAdmission`.
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AGENTS.mdREADME.mddsh-mneme/CHANGELOG.mddsh-mneme/README.mddsh-mneme/lib/api.jsdsh-mneme/lib/index.jsdsh-mneme/lib/scope.jsdsh-mneme/lib/service.jsdsh-mneme/lib/store.jsdsh-mneme/lib/tools.jsdsh-mneme/lib/write-admission.jsdsh-mneme/src/api.jsdsh-mneme/src/index.jsdsh-mneme/src/scope.jsdsh-mneme/src/service.jsdsh-mneme/src/store.jsdsh-mneme/src/tools.jsdsh-mneme/src/write-admission.jsdsh-mneme/test/write-admission.test.js
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CodeRabbit 在 slow-stack#305 上指出的口径错位：启动期 llm_audit_logs 清理读的是 rawCfg， 而写入侧（dream / summarize / 写入准入）读的都是装配后的 cfg（raw + 轻量预设 + 面板 kv 旗标）。面板把 llmAudit.enabled 打开、bundle 里是关的时，清理会跳过， 写入照写，审计表就无保留期地增长。 - 把启动期清理挪到 cfg 装配之后（nestedFlags 合并完），改读 cfg.llmAudit。 - 保留期默认 90 天与「失败只 warn」不变。 - 新增回归：面板说开 + bundle 说关 + 保留期 1 天，过期行必须被清掉。 该用例在旧代码下红（已用 stash 验证），修后绿。
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审查意见已修（commit 761f6bc）：启动期审计保留清理此前读的是 配了一条回归：面板说开 + bundle 说关 + 保留期 1 天，过期行必须被清掉；该用例在旧代码下红，修后绿。 读数：1330 tests / 1329 pass / 0 fail / 1 skipped； |
维护者 09-23 把写入准入拆成两阶段，并拍板第一阶段只记审计行、不拦截、由遥测
定 N 与 X。本批实现该阶段。
- 新增 src/write-admission.js：evaluate 出决策形状（恒 allow，无阈值），record
把测量点写进 llm_audit_logs（status='skipped'、metadata.gate=g1|g2）。
- g1 会话写入预算：每个新建行一行，按 session_key 分组计数即得分布；g2 同话题
冷却：话题锚（issue 引用 / 文件路径）重复新建时另加一行，带 topic 与 gap_ms。
- llm_audit_logs 新增可空列 session_key 与同名索引，迁移幂等；listLlmAudits /
countLlmAudits 增加可选 sessionKey 过滤。
- 穿透口：pinned 类型不进预算但照记一行；无会话身份的写入（dream / summarize /
import / organize）不进预算；纯合并不记行。
- 计量全程旁路：evaluate / record 抛错只 warn，不反噬写入。
第二阶段（拦截、memory_save({confirm:true})、归一化内容哈希、归档行纳入候选集）
不在本批。
CodeRabbit 在 slow-stack#305 上指出的口径错位：启动期 llm_audit_logs 清理读的是 rawCfg， 而写入侧（dream / summarize / 写入准入）读的都是装配后的 cfg（raw + 轻量预设 + 面板 kv 旗标）。面板把 llmAudit.enabled 打开、bundle 里是关的时，清理会跳过， 写入照写，审计表就无保留期地增长。 - 把启动期清理挪到 cfg 装配之后（nestedFlags 合并完），改读 cfg.llmAudit。 - 保留期默认 90 天与「失败只 warn」不变。 - 新增回归：面板说开 + bundle 说关 + 保留期 1 天，过期行必须被清掉。 该用例在旧代码下红（已用 stash 验证），修后绿。
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这一批做了什么
按你 09-23 的分阶段口径，这一批只做第一阶段：两个闸门只产遥测，不装阈值、不加拦截分支、不新增配置键，写入行为与默认路径逐字节一致。
src/write-admission.js。evaluate({memory, sessionKey})出决策形状（阶段一恒allow），record(...)把测量点写成审计行。这个形状就是你说的那三个消费方（本单闸门、[Feature] 注入形态：能力说明 + 指针 + 分时机注入（设计提案） #249 的注入时机、[Feature] 存储生命周期：归档区出口 + 审计表保留（容量治理议题） #275 的水位计数）共用的那一份，第二阶段只往里加confirm分支，不改字段。llm_audit_logs：trigger_source='writeAdmission'、operation_type='write_admission'、status='skipped'、metadata.gate='g1'。llm_audit_logs.session_key与同名索引。迁移幂等，索引建在加列之后，老库多进程打开照常。两条遥测怎么读
metadata.gate='g1'）。GROUP BY session_key计数即得「会话内新建条数」分布，P95 直接可算；要按预算口径剔掉穿透行（pinned 不进预算）再补一句json_extract(metadata,'$.exempt') IS NULL。topic与gap_ms附在该行的metadata.g2上，不另起一行，行数与新建行数一一对应。话题锚只收机械可判的两类：issue 引用（#123）与文件路径（分隔符归一）。不做相似度判定，按你 09-23 那条口径（阈值往两边挪都是在误判之间来回）。间隔算的是同一话题两次新建行之间：标题命中走并入的那次不在这里，并入正是冷却要做的事，已经做到了。读法用现成的 HTTP 面，不新增接口：
GET /api/dsh-mneme/semantic/llm-audit?source=writeAdmission。等价的 SQL 是operation_type='write_admission'分组。三处口径与取舍
metadata.exempt='pinned'，穿透频率可观测；无会话身份的写入（dream / summarize / import / organize）不记行；document 行走registerDocument的独立铸造口，本批不进预算。config.js、settings.js、client.js三处。对着 #254 验收清单
by_source会多一个writeAdmission桶（0 token），by_status.skipped跟着涨（与既有的skipped行同款读法），total_calls也把这些行算进去。你要这三处读数逐字节不变的话，我加一条过滤。metadata.gate与g2、exempt就是第二阶段判据的原始记录。session_key挡在审计列表端点之外：它是内部计数键，而那个端点按注释在apiToken之下也保持开放，按会话离线聚合直接读库。llmAudit.enabled=false关掉时本模块一行都不写，那个开关同时关掉了审计行的启动期清理，否则就是在无保留期的表里按写入频次增长。测试与闸门
npm test：1330 tests / 1329 pass / 0 fail / 1 skipped（本分支基线 1317，本批新增 13 条）。test/write-admission.test.js十二条：默认路径零审计行；g1 逐新建行计数（合并不记）；pinned 穿透仍记；g2 同话题带间隔且不另起一行；合并不产生 g2；穿透行不当基准；进程重启后话题表从审计行回填；llmAudit关掉零行；话题锚抽取（含标题###1、比值、版本号、分隔符归一等误报样本）；计量抛错不反噬写入；工具层接线（memory_save 把会话键传下去，缺会话身份落 null 不记行）；旧库自动补列且准入行可落可查。check-sync：src 与 lib 一致（46 文件）。scripts/sync-test-badge.mjs已刷（两份 README 的测试徽章 1317 到 1330），根仓test/mcp-package.test.js的跨包工具面平价 3 条仍绿。rawCfg，而写入侧读的是装配后的cfg（raw + 轻量预设 + 面板 kv 旗标）。面板把llmAudit.enabled打开、bundle 里关着时，清理会跳过而写入照写，审计表就无保留期地增长。现在清理挪到装配之后并读cfg.llmAudit；保留期默认 90 天与「失败只 warn」不变，配了一条回归（面板说开 + bundle 说关 + 保留期 1 天，过期行必须被清掉，该用例在旧代码下红）。