fix(server): cap the chat snapshot cache with an LRU bound

[Nicolas0315]

Takes the Chat snapshot cache has no size cap entry from KNOWN_ISSUES.md, which CONTRIBUTING points at as work that is ready to be picked up.

The cache drops an entry when the store reports the fleet gone and quarantines one learned to be unusable, but neither is reached by a fleet that simply stops being queried: its last FleetSnapshot stayed pinned for process lifetime, bounded only by the number of distinct fleets ever served.

The fix

A 256-entry LRU cap on snapshotCache, pruning fleetIdByReference and staleFleetIds with the evicted entry so the companion indexes do not outlive it. That pruning is about bounded growth, not behaviour: cachedFor needs both the alias and a live entry, so a retained alias answers identically once the entry is gone. No test distinguishes it from a plain snapshotCache.delete, and an earlier revision of this description implied one did. Map iteration order carries the recency: serving an entry re-inserts it, since set on an existing key does not reorder on its own.

Two decisions are load-bearing enough to call out, because both are the difference between a cap and a regression.

"Used" includes the fail-open reads. During an outage those entries are the only ones doing any work. Counting only healthy hits would let a fleet queried once mid-outage evict the entry that is actually carrying traffic, which ends the very fail-open the cache exists to provide.

Capacity eviction is deliberately not forgetFleet. forgetFleet bumps the fleet's forgotten generation, which is a store verdict ("gone", "unusable") and suppresses an in-flight snapshot load that predates it. Per the comment on forgottenGenerations, a suppressed publish is a cache miss and a miss right before an outage is a lost fail-open. Capacity has learned nothing about the fleet, so a load already in flight must still publish, and the next request repopulates from a store that in this path is by definition answering. That keeps the rule KNOWN_ISSUES asked for: eviction follows what the store says, or capacity, never a lookup that threw.

The cap is not an environment variable

CONTRIBUTING asks for an issue before a policy knob, and 256 is far above the scale the slice targets (fleets are few and long-lived), so snapshotCacheMaxEntries exists on AppConfig to make the eviction testable rather than to be tuned in production. It is the one AppConfig field with no HARU_* counterpart, which is why the JSDoc says so out loud.

Say the word and I will wire HARU_SNAPSHOT_CACHE_MAX_ENTRIES plus the README env table in a follow-up, or fold it in here.

Tests, and the mutations that prove they bite

Four cases in chat.test.ts. Each was checked against a deliberately broken implementation rather than assumed load-bearing, and each fails for exactly one reason:

Mutation	Result
Never evict (while (false && ...))	all four fail
Drop the cache-hit touch (plain FIFO)	only evicts by recency, not by insertion order fails
Drop the fail-open touch	only counts a fail-open read as use fails
forgetFleet instead of evictForCapacity	no longer fails anything, see below

The last one is the interesting case: request A freezes inside its snapshot load (gateSelect(2)), a second fleet publishes and pushes A's fleet out for capacity, then A resumes. With forgetFleet in that path A's publish is discarded as a lost race and the fleet answers 503 during the next outage; with evictForCapacity it publishes and still fails open.

KNOWN_ISSUES is rewritten, not deleted

The entry asked for the cap across four maps. Two are now capped; forgottenGenerations and referenceVerdictGenerations are not, so the entry stays with its scope narrowed to them and a reason:

pruning a generation map is un-fencing, not eviction. A generation is read as get(...) ?? 0, so deleting a counter resets it to 0, and the bad ordering is reachable: a load captures 0 for a fleet with no counter yet, a forget bumps it to 1, a prune deletes it, and the load compares 0 against 0 and publishes the entry the forget existed to bury. Safe pruning needs "no read predating this can still be in flight", which the code cannot observe today. The intended fix is sketched in the entry (a per-load token instead of a per-fleet counter, so forgetting a fleet forgets its fence with it).

Both language mirrors updated.

README

One bullet in each language, since this is operator-facing: past 256 actively served fleets in one process, the coldest answer 503 state_store_unavailable during an outage instead of going stale. That is a real behaviour change at a scale the design does not currently target, and it should not be discoverable only by reading app.ts.

Verification

Node 24.18.0, pnpm 11.10.0, macOS.

Step	Result
pnpm install --frozen-lockfile	clean
pnpm format:check	145 files, clean
pnpm build	7/7
Migration drift gate	db:generate exit 0, git status --porcelain packages/db/drizzle empty
pnpm typecheck	12/12
pnpm lint	12/12, Found 0 warnings and 0 errors per package
pnpm test (check lane)	12/12 tasks, @haru/server 120 tests (was 111)
test-postgres lane	7/7 tasks, @haru/db 45 and @haru/server 120 against a real postgres:17 container
check-no-em-dash equivalent	no U+2014 in any touched file

The Postgres lane was confirmed to have actually run rather than silently skipped: 1456 committed transactions in pg_stat_database afterwards.

The required checks here are action_required as usual for a fork PR.

Notes

• Branched from main, which has not moved since 9bf0062. No overlap with fix(db): give every query an abort budget #33, test(db): hold the viable-standby predicate's two copies in sync #34 or ci(dependabot): group the families that are only correct in lockstep #46: those touch packages/db and .github/ only.
• Not covered by a test, and not claimed to be: that evictForCapacity prunes fleetIdByReference and staleFleetIds (indistinguishable from the outside once the entry is gone, see above), and that a non-finite snapshotCacheMaxEntries falls back to the default (telling "bounded at 256" from "unbounded" needs 257 seeded fleets, and removing the guard leaves every cap test green). Both are guarded by construction. Say so if you would rather have a seam for either.

Second commit, from review

9cd4168 fixes a hole reviewers found in the first commit's central claim. Capacity eviction not disturbing an in-flight load was true of the eviction itself but not of what it leaves behind: snapshotLoadFailed reads "no entry currently cached" as a store verdict, and capacity eviction created a third way to reach that state which does not deserve one. The sequence is reload A in flight, another fleet evicting A's entry for capacity, reload B failing its snapshot read and quarantining the fleet, and A's successful result then discarded as a lost race, so a later outage answers 503 instead of stale.

Loads are now tracked per fleet and an entry being read is never the eviction victim; if every entry has a reader the cache stays over the cap until they finish, since the overshoot is bounded by in-flight concurrency while evicting one of them costs a fail-open. Two further fixes in the same commit: a non-finite cap made the bound vacuous (size > NaN is false), and a cap of 0 now clamps to 1.

Third commit, also from review

56168d7 makes "until they finish" literally true. In 9cd4168 the only trim ran inside publishSnapshotEntry, so an overshoot survived until some later publish arrived, and a publish may never arrive or may lose its race and return early. The loop is now evictOverflow, called from endSnapshotLoad as well, so the last reader to finish returns the cache to the cap.

The same commit fixes a policy bug nobody raised: the eviction candidate could be the entry just published, so under cap pressure with a reader on the older entry, a fresh publish was evicted to make room for itself. The just-published fleet is now exempt.

Fourth commit, also from review

350b251 closes the mirror of the bug above. The trim added in 56168d7 ran with no exemption, so the entry whose reader had just finished was itself a candidate. On the failure path that entry has just been served stale and touched to most-recently-used, so the trim could drop the newest entry to keep an older one that merely happens to still have a reader, costing a fail-open. The success path needed the same exemption for a second reason: the publish is the next statement, and an eviction there also drops fleetIdByReference entries the publish does not fully restore.

Fifth commit: a claim in this description had gone stale

7c40a43. The forgetFleet row of the mutation table above was true when written and is not now. Once loadsInFlight landed, a fleet with a load in flight is never an eviction victim, and generationBeforeLoad is captured in the same synchronous step that registers the load, so a capacity eviction has no in-flight load left to fence. Swapping evictForCapacity for forgetFleet keeps every test green.

The split stays, and the code comment now says why: it is the property the surrounding code reasons about, and the cost of getting it wrong is a silently lost fail-open rather than a visible failure. That is defence in depth behind loadsInFlight, which is a weaker claim than "proven by a test", and it should read as the weaker one.

The same commit rewrites the case that carried the old claim, and 250cf4b corrects the rewrite: it had described a capacity eviction racing an in-flight load (impossible now), and my first replacement described the completion trim, which this case also cannot observe, because on the success path the publish follows immediately and its own evictOverflow takes the same entry. It is now named for what it does pin down, a publish being allowed over the cap while a reload is pinned.

Nine cap cases total. Eight are mutation-checked and fail for exactly one reason each; the ninth is the one above, an end-to-end of the over-cap publish rather than a single-mutation probe, and its comment says so and points at the case that isolates the completion trim.

---

Summary by cubic

Caps the chat snapshot cache at 256 entries with an LRU bound, so a fleet that stops being queried no longer pins its last FleetSnapshot for process lifetime. Past 256 actively served fleets, the coldest one answers 503 state_store_unavailable during an outage instead of going stale; evicting a fleet also prunes its reference and stale-fleet index entries.

• Capacity eviction skips entries a snapshot load is reading and stays on its own path rather than forgetFleet, so eviction can't be misread as a store verdict; that split is defense-in-depth now that pinned entries are never candidates.
• The just-published entry and the entry a finishing load just served are exempt from trimming, and the cache trims back to the cap when a reader finishes.
• Cache hits and fail-open reads count as use, so an outage doesn't evict the entries serving traffic.
• The cap is an AppConfig option, not an environment variable; non-finite values fall back to the default, a 0 clamps to 1, and KNOWN_ISSUES now scopes the remaining uncapped maps to the two verdict-generation maps.
• Adds nine mutation-checked tests covering eviction, recency, fail-open reads, in-flight pinning, the cap-of-0 clamp, and both trim paths. The success-path case now names the publish trim it can actually observe; the neighboring failure case isolates the completion trim.

^{Written for commit 250cf4b. Summary will update on new commits.}

Summary by CodeRabbit

• New Features

  • Added a snapshot-cache capacity limit, defaulting to 256 fleets and supporting configuration.
  • Added least-recently-used eviction to keep the cache within its limit.
  • Cache hits and fail-open responses now refresh entry recency.
  • Fleets evicted during a state-store outage return 503 state_store_unavailable instead of stale routing.

• Documentation

  • Documented cache limits, eviction behavior, and remaining verdict-tracking limitations.

• Tests

  • Added coverage for capacity limits, LRU behavior, fail-open access, and concurrent snapshot loading.

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164-176: LGTM!

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---

Walkthrough

The chat snapshot cache now has a default 256-entry LRU limit. Cache reads and publications update recency, and capacity eviction removes related state. Tests cover eviction, fail-open access, and in-flight loads. Documentation records the limit and remaining generation-map issue.

Changes

Snapshot cache capacity

Layer / File(s)	Summary
Cache capacity and LRU implementation services/haru-server/src/app.ts	AppConfig accepts snapshotCacheMaxEntries. The cache defaults to 256 entries, updates recency on reads and publications, protects in-flight loads, and evicts least-recently-used entries without changing forget-generation fences.
Capacity and concurrency validation services/haru-server/src/chat.test.ts	Tests cover capacity eviction, recency changes from cache and fail-open reads, minimum-capacity normalization, deferred trimming, in-flight load protection, and publication after eviction.
Documented cache and generation-map boundaries README.md, README.ja.md, KNOWN_ISSUES.md, KNOWN_ISSUES.ja.md	Documentation describes the 256-entry LRU limit, outage behavior for evicted fleets, and the remaining uncapped generation maps.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant ChatRequest
  participant SnapshotCache
  participant StateStore
  ChatRequest->>SnapshotCache: Read fleet snapshot
  SnapshotCache->>StateStore: Load on cache miss
  StateStore-->>SnapshotCache: Return snapshot or failure
  SnapshotCache->>SnapshotCache: Refresh LRU order and evict over-capacity entries
  SnapshotCache-->>ChatRequest: Return snapshot or state_store_unavailable

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Summary

Caps the chat snapshot cache with an LRU bound while preserving fail-open behavior during concurrent snapshot loads.

• Adds a default 256-entry cache limit with validation for zero and non-finite configuration values.
• Refreshes recency on healthy cache hits and stale fail-open reads.
• Pins entries during snapshot loads, permits temporary bounded overflow, and trims when readers finish.
• Prunes companion alias and stale-state indexes during capacity eviction.
• Documents the operational behavior and narrows the remaining known issue to uncapped verdict-generation maps.
• Adds concurrency, recency, outage, and capacity tests; the post-review change only corrects one test’s description.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Chat request] --> B{Fresh cache hit?}
    B -->|Yes| C[Touch entry as MRU]
    B -->|No| D[Pin fleet and load snapshot]
    D --> E[Unpin fleet and trim overflow]
    E --> F{Load succeeded?}
    F -->|Yes| G[Publish as MRU]
    G --> H[Evict oldest unpinned non-exempt entry]
    F -->|No, cached entry usable| I[Touch entry and serve stale]
    F -->|No fallback| J[Return 503]

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Actionable comments posted: 1

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Inline comments:
In `@services/haru-server/src/app.ts`:
- Around line 167-170: Update the snapshot cache capacity initialization around
snapshotCacheMaxEntries to handle non-finite configured values before applying
Math.max: use the configured value only when Number.isFinite returns true, clamp
finite values to at least one, and otherwise use
DEFAULT_SNAPSHOT_CACHE_MAX_ENTRIES. Add coverage for NaN, Infinity, and
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📄 CodeRabbit inference engine (CONTRIBUTING.md)

Files:

• services/haru-server/src/chat.test.ts
• services/haru-server/src/app.ts

Use `@haru/db/testing` and its committed migrations for database tests; do not add per-test migration calls.

📄 CodeRabbit inference engine (AGENTS.md)

Files:

• services/haru-server/src/chat.test.ts

Keep new I/O behind injectable boundaries so it can be tested without GPUs, cloud accounts, or a running database.

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Files:

• services/haru-server/src/chat.test.ts
• services/haru-server/src/app.ts

新しい I/O は注入可能な境界の背後に配置し、外部実行、fetch、子プロセス、タイマーなどをテストダブルに置き換えられるようにする。

📄 CodeRabbit inference engine (CONTRIBUTING.ja.md)

Files:

• services/haru-server/src/chat.test.ts
• services/haru-server/src/app.ts

Use kebab-case for file names.

📄 CodeRabbit inference engine (CONTRIBUTING.md)

Files:

• README.md
• KNOWN_ISSUES.md
• README.ja.md
• services/haru-server/src/chat.test.ts
• services/haru-server/src/app.ts
• KNOWN_ISSUES.ja.md

ファイル名は kebab-case にする。

📄 CodeRabbit inference engine (CONTRIBUTING.ja.md)

Files:

• README.md
• KNOWN_ISSUES.md
• README.ja.md
• services/haru-server/src/chat.test.ts
• services/haru-server/src/app.ts
• KNOWN_ISSUES.ja.md

コードと文章ではエムダッシュ (U+2014) を使用せず、コロン、コンマ、括弧、またはスペース付きハイフンを使用する。

📄 CodeRabbit inference engine (CONTRIBUTING.ja.md)

Files:

• README.md
• KNOWN_ISSUES.md
• README.ja.md
• services/haru-server/src/chat.test.ts
• services/haru-server/src/app.ts
• KNOWN_ISSUES.ja.md

Use English code comments and prose, and avoid the em dash character U+2014.

📄 CodeRabbit inference engine (AGENTS.md)

Files:

• README.md
• KNOWN_ISSUES.md
• README.ja.md
• services/haru-server/src/chat.test.ts
• services/haru-server/src/app.ts
• KNOWN_ISSUES.ja.md

🪛 LanguageTool

KNOWN_ISSUES.md

[typographical] ~19-~19: The word ‘Where’ starts a question. Add a question mark (“?”) at the end of the sentence.
Context: ...tions, referenceVerdictGenerations). - Current: snapshotCacheandfleetId...

(WRB_QUESTION_MARK)

---

[style] ~31-~31: Consider using the typographical ellipsis character here instead.
Context: ...s un-fencing. A generation is read as get(...) ?? 0, so deleting a counter resets ...

(ELLIPSIS)

[cubic-dev-ai]

All reported issues were addressed across 6 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[cubic-dev-ai]

All reported issues were addressed across 2 files (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>