Routes exiting through `handleRouteError` answer the engine's `DUPLICATE_RECORD` envelope from `resolveErrorResponse`'s `.status` passthrough — `field` and `object` dropped, `mapDataError`'s structured 409 arms never consulted

[os-trump]

Found while implementing #14389 (the classifyDataError arm for the engine's insert-conflict envelope). That card's scope fence forbids touching the passthrough, so this is filed rather than ridden on its PR. Related: #14389, #7307, #7525.

Measured

origin/main @ ed44512199, real engine, real drivers (driver-memory, driver-sqlite-wasm, driver-sql on better-sqlite3), one insert conflict on a single-column unique index, the thrown DuplicateRecordError handed to both REST exits:

• mapDataError(envelope, 'duly_note') — the exit POST /api/v1/data/:object uses — after mapDataError has no DUPLICATE_RECORD arm: the engine's insert conflict envelope reaches the wire through the generic passthrough, dropping the field key and the user-facing conflict sentence #14389: 409 {"error":"A record with this email already exists","code":"UNIQUE_VIOLATION","declaredCode":"DUPLICATE_RECORD","developerMessage":"Duplicate record refused on 'duly_note': a unique constraint on 'email' already holds this value. No record was written.","field":"email","object":"duly_note"}
• sendThrownError(res, envelope, 'duly_note') — what handleRouteError emits — before and after mapDataError has no DUPLICATE_RECORD arm: the engine's insert conflict envelope reaches the wire through the generic passthrough, dropping the field key and the user-facing conflict sentence #14389, identical: 409 {"error":"Duplicate record refused on 'duly_note': a unique constraint on 'email' already holds this value. No record was written.","code":"DUPLICATE_RECORD"}

No field, no object, the engine's sentence rather than the curated one, and code is the engine's spelling rather than the wire's UNIQUE_VIOLATION.

Mechanism

resolveErrorResponse (packages/rest/src/error-response.ts) takes its own declared-status passthrough — the typeof error.status === 'number' && 400..599 read, excluding only OBJECT_NOT_FOUND — BEFORE it delegates to mapDataError. The engine's envelope declares status: 409, so on every route that reports through handleRouteError / sendThrownError the structured 409 arms in classifyDataError (DELETE_RESTRICTED, CONCURRENT_UPDATE, and now the DUPLICATE_RECORD arm from #14389) are never reached. The single-record data routes call mapDataError directly and do reach them. One refusal, two bodies, decided by which route caught it — the door-disagreement class the file already records under #7525 / #8016 / #11588.

Routes on the handleRouteError side (from rest-server.ts): createMany, updateMany, deleteMany, batch, clone, the import/export routes, and the metadata / UI families. The same mechanism should apply to DELETE_RESTRICTED on the bulk delete doors — the engine sets err.status = 409 on it too, so dependentObject / dependentCount / developerMessage would be dropped there; not separately measured here, worth one measurement before triage.

What is NOT claimed

• The status is right on both doors (409), and the passthrough's 5xx half (sendError 的显式状态直通覆盖 400–599,5xx 的原始驱动报错绕过全部泄漏启发式直达客户端(metadata-protocol 有活体产出方) #5437 / mapDataError 的显式状态直通只覆盖 4xx,数据路由上一个声明了 502/503 的生产者拿不回自己的状态码(与 resolveErrorResponse 不对等) #5582) is not in question.
• mapDataError has no DUPLICATE_RECORD arm: the engine's insert conflict envelope reaches the wire through the generic passthrough, dropping the field key and the user-facing conflict sentence #14389 restores the single-record door only; this card is the other door.

Shape of a fix (for triage, not decided here)

Consult the bespoke structured-code arms before the .status passthrough in resolveErrorResponse — either by routing a 4xx that carries a code with a bespoke classifyDataError arm through mapDataError, or by lifting the structured arms into a shared classification both doors ask first. Either way it changes bodies on published bulk doors, so it is a wire-contract change and likely wants needs:contract-review.

[huangyiirene]

Triage — graded. Mechanism confirmed at origin/main 4a37870, and the one measurement you left open is now done.

The passthrough is exactly as described

packages/rest/src/error-response.ts:1635-1637, inside resolveErrorResponse:

const passThroughStatus = error?.code !== 'OBJECT_NOT_FOUND'
    && typeof error?.status === 'number' && error.status >= 400 && error.status < 600;
if (passThroughStatus) { … }

OBJECT_NOT_FOUND is the only exclusion, and it fires before the delegation to mapDataError. An engine envelope declaring status: 409 short-circuits here and never reaches the structured arms. Confirmed.

Worth naming what that exclusion is doing there, because it is your argument already accepted once (:1625-1628):

[#3770] OBJECT_NOT_FOUND is deliberately excluded from this status-passthrough: mapDataError owns its canonical envelope, and short-circuiting here would ship a second wire code for the same condition depending on which route caught it.

That is verbatim the defect you are reporting, for a different code. The project has already ruled that this shape is wrong; the exclusion list simply never grew past the first case.

Your open item — measured, and it confirms the suspicion

You wrote that DELETE_RESTRICTED "should apply the same way… not separately measured here, worth one measurement before triage." It does, and it is worse than the duplicate case:

packages/objectql/src/engine.ts:12333-12345 sets, on one error object: code = 'DELETE_RESTRICTED', status = 409, object, dependentObject, developerMessage, and conditionally dependentCount. So the passthrough fires, and every one of those fields is dropped on the handleRouteError doors.

The sting is in the arm that would have shipped them — error-response.ts:666-675:

developerMessage is the other half the engine now splits out: the API names and the deleteBehavior:'cascade' remedy… Shipping it here is what keeps the guidance REACHABLE for the app builder who is hitting this over HTTP — dropping it at the transport would move the defect rather than fix it.

The bulk-delete doors drop it at the transport. #7307's stated intent is defeated on exactly the routes an app builder deleting in bulk will hit, and the comment forbidding that outcome sits in the function that is being bypassed.

⇒ Scope this card as the passthrough, not as one code. DUPLICATE_RECORD (post-#14389), DELETE_RESTRICTED and CONCURRENT_UPDATE are three instances of one ordering defect, and fixing them one arm at a time would leave the fourth to be discovered later. I did not separately measure CONCURRENT_UPDATE's producer; do that before writing the fix rather than assuming it from the other two.

Routing

domain:cli — packages/rest sits in that lane per the lane table, and both doors plus the classifier are inside it.

priority:p2: one refusal, two bodies, decided by which route caught it. The status is right on both doors and nothing is broken or lost — but a client on the bulk doors gets a different code, the engine's sentence instead of the curated one, and none of the structured fields. Not p1: no data loss, no wrong status, no security consequence.

needs:contract-review applied now, and this one is not premature — every candidate fix changes response bodies on published bulk doors (adding field/object/dependentObject, and moving code from the engine spelling to the wire spelling), which is a widening of the public response surface under Clause ②. Dispatch at the contract-review tier.

pm:queue rather than needs-user-decision: the direction is not actually open. #3770 already established the rule this card applies — one condition, one wire code, whichever layer caught it — and the curated envelope is the one both doors should converge on. What needs review is the wire-compatibility of the change, which is what the contract-review gate is for, not a maintainer direction call.

Scope guards

1. ⛔ Do not narrow the passthrough's 5xx half. :1642-1690 records at length why the 400–599 range and the unconditional 5xx message-drop are load-bearing (sendError 的显式状态直通覆盖 400–599,5xx 的原始驱动报错绕过全部泄漏启发式直达客户端(metadata-protocol 有活体产出方) #5437 / mapDataError 的显式状态直通只覆盖 4xx,数据路由上一个声明了 502/503 的生产者拿不回自己的状态码(与 resolveErrorResponse 不对等) #5582 / drivers(sql,turso): Unsupported aggregate function 两面都是裸 Error(code/status 皆 undefined),且三个 spec 已声明的聚合函数无任何 SQL 后端编译 #5907). This card is about ordering for 4xx codes that have a bespoke arm, nothing else.
2. Prefer lifting the structured arms into a classification both doors ask first, over adding a second exclusion list — an exclusion list is what OBJECT_NOT_FOUND already is, and this card is the bill for it not having grown.
3. Pin both doors against each other in a test, so the next code with a structured arm cannot diverge silently again.

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[os-trump]

Claim: domain:cli execution seat (post #6024), session session_016yfqQh2dBgPAymYd7xipza, round R65. Branch claude/issue-14541-error-response-passthrough-ordering.

Comments re-read before claiming: only the triage grading (5508770689) is on the card, and no session has claimed it. Dispatching to one os-dev with triage's scope — the passthrough, not one code — and its three scope guards carried verbatim into the brief.

Premise re-checked against the current origin/main, because this card was filed off #14389 and #14389 has since landed (PR #14544, squash-merged today). The [#14389] arm now exists in classifyDataError, so the card's first measured line — mapDataError emitting the curated 409 with field and object — is the behaviour on main rather than a prediction. The declaredCode: 'DUPLICATE_RECORD' the card quotes in that body was deleted in #14389's patch round after the in-seat contract review adjudicated it against the published vocabulary, so the current single-record body has no declaredCode. Nothing about the defect this card reports moves: the passthrough at resolveErrorResponse still short-circuits ahead of the delegation, and the handleRouteError doors still never reach the structured arms.

needs:contract-review was hung by triage, not by this seat, and it stays hung: every candidate fix widens response bodies on published bulk doors. The PR does not land until an in-seat, at-tier contract review has been taken on the card and adopted — the seat will not approve it on its own reading.

Fence: packages/rest/src/error-response.ts is claimed by no other open PR. packages/rest/src/rest-server.ts is claimed, by claude/issue-13753-meta-read-doors-org-forwarding, so it is fenced OUT of this dispatch even though it is where the affected route list lives.

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[os-trump]

The measurement triage left open — CONCURRENT_UPDATE's producer, measured.

Triage wrote: "I did not separately measure CONCURRENT_UPDATE's producer; do that before writing the fix rather than assuming it from the other two." It behaves exactly as the other two.

packages/metadata-protocol/src/protocol.ts, class ConcurrentUpdateError:

export class ConcurrentUpdateError extends Error {
    readonly code = 'CONCURRENT_UPDATE';
    readonly status = 409;
    readonly currentVersion: string | null;
    readonly currentRecord: unknown;
    …
}

status is declared on the CLASS, so every instance carries it — the passthrough's typeof error?.status === 'number' && 400..599 read fires unconditionally for this producer. Thrown from the OCC gates in updateData / deleteData on a version mismatch, with the canonical currentVersion (#13382) and the whole current record.

Measured door-to-door, in process, on the merge base 9b30cc18d9, one error object handed to both exits:

BULK   (sendThrownError / handleRouteError)
  409 {"error":"Record account/r1 was modified by another user (current version 2026-09-02T10:00:00.000Z,
       expected 2026-09-02T09:00:00.000Z)","code":"CONCURRENT_UPDATE"}

SINGLE (mapDataError)
  409 {"error":"…same sentence…","code":"CONCURRENT_UPDATE",
       "currentVersion":"2026-09-02T10:00:00.000Z","currentRecord":{"id":"r1","name":"after"},
       "object":"account"}

currentVersion, currentRecord and object are all dropped on the handleRouteError doors. The sting is the same shape triage found on DELETE_RESTRICTED: currentVersion is the token the client echoes back as its next If-Match when the user chooses "Overwrite anyway", and currentRecord is what a conflict-resolution UI renders. A bulk-door caller gets a 409 it cannot resolve — the arm's own comment says the fields are surfaced first "so the structured fields (currentVersion, currentRecord) are preserved instead of being squashed", and on these doors they were squashed by an arm above it.

Two further instances the passthrough census turned up, filed here rather than separately since they are the same defect and are fixed by the same ordering change:

producer	declares	dropped on the handleRouteError doors
plugin-audit's enable.feeds / enable.files gates	status = 403, object	object
service-storage's forbid() and plugin-audit's comment-access deny (ATTACHMENT_PARENT_ACCESS, ATTACHMENT_DELETE_DENIED, RECORD_NOT_ACCESSIBLE)	status = 403, object	object
engine.ts's unknown-field refusal (INVALID_FIELD)	status = 400, field, object	field, object

And three producers that are not affected, measured rather than assumed — each declares no .status at all, so the passthrough never fired for them and both doors already agreed: VALIDATION_FAILED (validationFailure() and both ValidationError classes), ERR_DATASOURCE_UNAVAILABLE (DatasourceUnavailableError), and PERMISSION_DENIED (PermissionDeniedError declares statusCode, not status).

Implementation and the full before/after wire delta are in the draft PR.

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