feat(graph): 边权重演化 Weight Evolution（issue #24 块2） - #342
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entity_relations 加 weight + source 列（idempotent migration，存量行默认 manual 1.0），按建边来源映射初值：manual/confirmed 1.0、tag 0.3（LLM 打的延续偏见，靠「用出来」抬升）、llm 0.4。extractor 自动建边落 source=llm。 bumpRelationWeight 演化接口：只加不减、封顶 1.0，留给 touch 门控驱动。 哲学「关系是用出来的，不是建出来的」：初值只反映来源，抬升靠触达。 - store：pgsm 两列 + saveRelation source→weight 映射 + bumpRelationWeight - extractor：LLM 抽取建边标记 source=llm（初始 0.4） - config：graphWeightEnabled（默认关=行为不变）+ graphWeightDelta，全走 feature_flags 面板可启停、lightMode 强制关闭 - 设计呼应 heptaspirit serendipity-engine 结论：touch 只记录不演化、 tag 低起步共享同一自激回路顾虑（#234 同源）；本块先把「演化接口 + 存储」 立起来，真正的自激风险留给数据印证后由调用方量化决定 测试：6 组 graph-weight-evolution 新增全过；entities 全组回归绿
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📝 WalkthroughWalkthrough本次变更为关系记录新增权重和来源字段、默认权重及权重递增方法。配置新增权重演化选项，LLM 抽取关系时写入来源标记，并新增相关存储测试。 Changes关系权重与来源
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Suggested reviewers: Merge Risk: 🔵 Low · up to The new weight API can lower a weight or lose concurrent increments, and an unusual source name can make saving a relation fail. Weight evolution is off by default, so the practical impact is bounded, but these should be fixed before callers adopt it. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change is largely storage preparation: inspected retrieval paths do not use relation weights, and no production caller currently initiates weight evolution. The main uncertainties concern migration recovery and the guarantees needed before weights influence trusted decisions. Retained concerns Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
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Review comments at @dsh-mneme/src/store.js:
- Line 2440: Update the weight lookup in src/store.js at line 2440 to use
RELATION_SOURCE_DEFAULTS only when src is an own property; otherwise, default to
1.0 when no explicit weight is provided. Apply the same change to lib/store.js
at line 2440 so the generated file stays synchronized.
- Line 2457: Update the `bumpRelationWeight` storage API to reject negative and
non-finite increments before calculating or persisting the new weight, and add a
regression test for a negative increment. At dsh-mneme/src/store.js lines
2457–2457, validate the increment at the storage boundary; at
dsh-mneme/lib/store.js lines 2457–2457, synchronize the generated output from
the corrected source.
- Line 2458: Replace the read-then-write weight update with a single atomic SQL
update that applies the increment and caps the weight at 1.0, while preserving
the existing increment validation and using the update’s changes count to report
whether the row existed. Apply the same fix in dsh-mneme/src/store.js at
2458-2458 and dsh-mneme/lib/store.js at 2458-2458.
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dsh-mneme/lib/config.jsdsh-mneme/lib/entities/extractor.jsdsh-mneme/lib/store.jsdsh-mneme/src/config.jsdsh-mneme/src/entities/extractor.jsdsh-mneme/src/store.jsdsh-mneme/test/graph-weight-evolution.test.js
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背景
issue #24（v0.8 图谱增强）块2 权重演化：让边权重反映「用出来的关系」而非「建出来的关系」。
改动
entity_relations加weight REAL DEFAULT 1.0+source TEXT DEFAULT 'manual'（幂等 migration，存量行默认 manual 满权，迁移不改变既有语义）saveRelationsource→初值映射（RELATION_SOURCE_DEFAULTS）：manual/confirmed 1.0/tag 0.3（LLM 打的标签延续 LLM 偏见，低起步靠触达抬升）/llm 0.4；显式weight优先于映射bumpRelationWeight(id, delta)：演化接口——只加不减、封顶 1.0，幂等（缺行返回 false）。留给 touch 门控驱动的调用方决定「何时算一次有效触达」source="llm"（初始 0.4）graphWeightEnabled（默认关=行为逐字节不变）+graphWeightDelta(0.1)，全走 feature_flags 面板可启停、lightMode 强制关闭设计取舍
呼应 heptaspirit serendipity-engine（#24 评论）：touch 只记录不演化——「点击 → 边权变 → 结果变 → 再点击」是自激回路，吃不准究竟学到了关系还是把视野越收越窄（与 heat 线 #234 对自激的顾虑同源）。本块立起「存储 + 演化接口」但默认关：演化接口就绪，真正的触达决定权留给调用方（块4 touch 门控）在数据印证后量化。
测试
test/graph-weight-evolution.test.js（新）：来源映射 / weight 显式优先 / toRelation 回读 / bump 只加不减封顶幂等 / extractor 建边 / 默认权重状态
独立可合（不依赖 #341）。块1 #341 已提。依次：块3（注入预算）/ 块4（被动确认）。
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