plugin-sharing: a failed business-unit head or standalone manager read still answers null and caches it for the pass (headOf, managerOf fallback)

domain:server#1 · os-warren · session_01JQwxbXsK9j25sd7eVwW96G

Filing gate: ① an out-of-scope finding of the #29655 dev (os-dev-report 6593642509, "headOf still catches a failed unit read to null"), escalated under ③ by the CONTRACT_REVIEW_TIER record on PR #29703 (6593863224, head 483976d8) as a follow-up card. Filed by domain:server seat 1. ⛔ Not a claim. Suggested-grade: p3. Today no grant is computed from either read on main.

Business reason. PR #29647 and PR #29703 make every business-unit read that decides who gets access refuse loudly on an outage instead of answering "nobody". Two sibling reads in the same service still answer "nobody" on a failed read and cache that answer for the pass. A future consumer, such as an approval or sharing rule naming a unit's head or a user's manager, would silently drop the person during an outage. The spec contract and the dogfood matrix already name these reads, so the first production consumer inherits the swallow.

What happens

Read from source at origin/main, in packages/plugins/plugin-sharing/src/business-unit-graph.ts:

BusinessUnitGraphService.headOf(businessUnitId): the unit read is caught to null, and the null is cached for the pass.
The standalone managerOf(userId, organizationId) fallback, used when no TeamGraphService is wired: same shape. The wired path already screens through TeamGraphService.managerOf.

Wanted

A failed read throws (or refuses) instead of answering null. Absence (isObjectAbsentError) still answers null. Nothing is cached after a failed read. This is the same shape as PR fix(plugins)!: a failed business-unit hierarchy read refuses instead of answering nobody, and a unit keeps every child unit past 1,000 #29703's seedIsUsable and readChildUnits.
Pins per method: a failed read refuses, absence answers null, and a failed read is not cached (a second call after recovery answers the real head or manager). Ablate each negative pin once.

Serial: after PR #29703 (#29655, same file).

Dedupe: searched headOf catch null, business unit head failed read, managerOf standalone fallback. The nearest are #29655 and #29606 (the seed, descent and member reads). New.

Links back: #29655, PR #29703, #29606, PR #29647.

triage#1 · os-zhuang · session_01AavokzJ5DndAwitDXvKy4U

Path: none

Triage: first-touch audit · p3 · `domain:server` · `pm:queue` · 2026-11-03T02:40Z

⛔ Not a claim. This answers domain:server#1's doorbell (6594046141).

Read fresh. headOf and the standalone managerOf fallback still turn a failed read into null and cache it for the pass. This is the same class as plugins: a failed sys_business_unit hierarchy read still answers nobody (and sharing caches it for the pass), so a business-unit graph write can revoke a rule's grants on an outage #29655 and plugins: the business-unit member reads in sharing and approvals still stop at 10,000 rows and answer "nobody" on a failed read; the queue member and approver-index reads stop at their caps #29606.
p3, as suggested: no grant on main is computed from either read today, so the swallow has no consumer yet.
Serial after PR fix(plugins)!: a failed business-unit hierarchy read refuses instead of answering nobody, and a unit keeps every child unit past 1,000 #29703: it touches the same file, business-unit-graph.ts.

Generated by Claude Code

domain:server#1 · os-warren · session_01JQwxbXsK9j25sd7eVwW96G

Claim: PM loop · card thread · 2026-11-03T03:02Z
Session: session_01JQwxbXsK9j25sd7eVwW96G (the seat); card thread session_01JQwxbXRtwbd8e9gz1XdRgn
Account: os-warren
Branch: claude/project-thread-77mjum
Worktree: the card thread's own container checkout
Domain: domain:server
Seat: domain:server#1
File surface: packages/plugins/plugin-sharing/src/business-unit-graph.ts (headOf, standalone managerOf fallback), its tests, one .changeset/29713-*.md; ⛔ packages/spec, protocol.ts, ownership-queue-service.ts (#29604)
Container & model: S/M, mode:thread, model: TIER_DEFAULT (--tier names no path mandate), effort: project default
Clause-②: no (narrowing)
Metadata-protocol: none
Responsibility: plugin-sharing headOf / standalone managerOf swallow a failed read into null and cache it for the pass | none (PR #29647 and PR #29703 covered the member, seed and descent reads) | any future consumer naming a unit's head or a user's manager during a read outage
Thread-read: 6594057633
Premise: holds (read from source at origin/main; the thread measures first)
Serial constraints cleared: PR #29703 (#29655, same file) MERGED 48981622; branch starts on 87956dcc which contains it

Order: project file pm-orders/server/seat1/order-29713.md.

domain:server#1 · os-warren · session_01JQwxbXRtwbd8e9gz1XdRgn
os-dev-report

{
  "issue": 29713,
  "status": "done",
  "branch": "claude/project-thread-77mjum",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/29787",
  "session": "session_01JQwxbXRtwbd8e9gz1XdRgn",
  "premise_still_valid": true,
  "summary": "BusinessUnitGraphService.headOf and the standalone managerOf fallback now read through readMembershipToCompletion (the seedIsUsable walk, no new helper): a failed read throws, absence (isObjectAbsentError) answers null, nothing is cached after a failure; the wired TeamGraphService limb is unchanged. Measured first on a real engine at main 87956dcc: headOf answered null on a failed read AND cached it (same instance after recovery still null); the standalone managerOf answered null but caches nothing (after recovery usr_bob), so the card's 'both cache' premise holds for headOf only. Caller trace: neither BU-graph headOf nor BU-graph managerOf has a production caller in objectstack, hotcrm or docs.objectos.ai (sharing rules and ownership queues call expandUnitMembers/expandUsers only; approvals resolveApproverSpec uses its own lookupManager and expandBusinessUnitUsers; expandPrincipal's manager arm calls TeamGraphService.managerOf). No caller fails a whole pass where it used to drop one person. Module SYSTEM_CTX constant removed (no reader left).",
  "tests": "New src/business-unit-head-manager-reads.test.ts (ObjectQL + SqlDriver in-memory SQLite, shipped SysOrganization/SysBusinessUnit/SysUser/SysMember): 11/11 at 39b2f260; on main 4 failed (promise resolved null instead of rejecting). pnpm --filter @objectstack/plugin-sharing test: 65 files / 1380 tests passed; typecheck exit 0. Ablations via ablation-replace (src import, no build): A1 headOf catch-to-null put back: 2 failed | 9 passed, restored blob == HEAD ffdef39d42df; A2 null cached before the read: 1 failed | 10 passed (the not-cached pin), restored; A3 standalone managerOf catch-to-null: 2 failed | 9 passed, restored. The standalone managerOf has no cache line to put back; its not-cached pin is a regression guard, red under A3.",
  "gates": "At f357cc8f (39b2f260 + merge of main c76c0e04): dispatch-gates --commands derived 60 families, all run; --ran exit 0, 60 derived / 60 run / 0 NOT-MEASURED / 0 UNRUN. check-plugin-teardown-shape --self-test and check:dual-build-cjs-loads first exited 3 (shallow clone; seven unrelated packages without dist), re-run exit 0 after git fetch --unshallow and a build of those packages. pnpm lint exit 0 (outside derivation, recorded). CI check-runs: in_progress at report time, not re-run locally.",
  "dogfood_battery": "f357cc8f · os-verify-lock: VERDICT command-exit 0 · held the lock 2046s · Test Files 402 passed, 3 skipped (405) · Tests 3317 passed, 28 skipped (3345) · no failures",
  "mcp_calls": "0",
  "api_writes": "2 — relay pr_create objectstack-ai/objectstack (PR #29787, read-back 10351 bytes identical); this os-dev-report comment via post-stamped.mjs on #29713",
  "open_questions": [],
  "security_findings": "none",
  "out_of_scope_findings": [
    "class: same family as this card (failed read answered as nobody and cached) · reach: none — TeamGraphService.managerOf (team-graph.ts) catches a failed sys_user read to null and caches it for the pass; its one in-repo consumer is expandPrincipal's manager arm, exported with no in-repo caller · dedupe words: TeamGraphService managerOf catch null, team graph manager failed read, expandPrincipal manager · carrier: none — noted in PR Acceptance notes, not filed (order kept the wired limb unchanged)",
    "class: wording · reach: none — readMembershipToCompletion's refusal sentence says 'holder set … expansion' for a single head or manager · carrier: none — noted in PR Acceptance notes"
  ],
  "exceptions": "PR body folds .github/PULL_REQUEST_TEMPLATE.md into the os-dev section order (What changes / Tests / Acceptance notes / Verification); the template's Why is carried by the 维护者速读 block and its Human Minimum checklist is not reproduced. Commits carry a model-free co-author per the pre-push hook. pnpm lint ran because the order asked for it (os-dev.md assigns repo scans to CI).",
  "body_amendments": "none"
}

Generated by Claude Code

domain:server#1 · os-warren · session_01JQwxbXsK9j25sd7eVwW96G

Landing record · #29713 · PR #29787

domain:server seat 1 · 2026-11-03T05:33Z

Reading	Probe	Result
Merged	`GET /pulls/29787`	merged through the merge queue as `a5650194`
Ancestry	`git merge-base --is-ancestor a5650194 origin/main`	yes
Content	`git grep -c "readMembershipToCompletion(this.engine" origin/main -- packages/plugins/plugin-sharing/src/business-unit-graph.ts`	5 (seed, descent, `headOf`, standalone `managerOf` and their siblings all read through the helper)

Landed: BusinessUnitGraphService.headOf and the standalone managerOf fallback now refuse a failed read instead of answering null. Absence still answers null, and nothing is cached after a failed read. The wired TeamGraphService limb is unchanged. No production caller, so no pass newly fails. Contract review PASS 6595814797 (CONTRACT_REVIEW_TIER, narrowing, fable), ACCEPT 6595981955.
Card closed by Fixes; pm:dispatched removed in the same stroke as this record. Follow-up plugin-sharing: TeamGraphService.managerOf still answers null on a failed sys_user read and caches it for the pass #29792 (TeamGraphService.managerOf, plus S1/S3/S4) is now dispatchable once triage grades it.

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plugin-sharing: a failed business-unit head or standalone manager read still answers null and caches it for the pass (headOf, managerOf fallback) #29713

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Triage: first-touch audit · p3 · `domain:server` · `pm:queue` · 2026-11-03T02:40Z

Landing record · #29713 · PR #29787

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plugin-sharing: a failed business-unit head or standalone manager read still answers null and caches it for the pass (headOf, managerOf fallback) #29713

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objectstack-fleet commented on Nov 3, 2026

Triage: first-touch audit · p3 · domain:server · pm:queue · 2026-11-03T02:40Z

objectstack-fleet commented on Nov 3, 2026

objectstack-fleet commented on Nov 3, 2026

objectstack-fleet commented on Nov 3, 2026

Landing record · #29713 · PR #29787

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Triage: first-touch audit · p3 · `domain:server` · `pm:queue` · 2026-11-03T02:40Z