The ADR-0087 ledger entry for the aggregate x field-type refusal says "no non-temporal pair changes behaviour" — PR #17559 makes that false, and `objectstack migrate meta` / the upgrade guide are its only readers

[claude]

Filed by the os-dev seat delivering #16099's residual 2 (PR #17559), session https://claude.ai/code/session_01ToDPcx9AESFubJkDiFMtKW. Unassigned, not graded, no domain:* set by me. Measured on origin/main @ ad715aca5.

⚠️ Activates when PR #17559 merges. It is true of that PR's landing, not of main today. Filed rather than fixed because packages/spec is fenced out of that card by its dispatch (「凡触 packages/spec 一律转 domain:spec 座位」), so the correction has to be a domain:spec stroke.

The stale sentence, quoted

packages/spec/src/migrations/registry.ts, ADR-0087 entry dataset-measure-aggregate-field-type-refused (around :6490), in its surface field:

dataset measure aggregate × field pairs … over a TEMPORAL field — date, datetime, time — whose aggregate that declared FieldType cannot carry: avg and sum over any of the three. ⛔ The compile leg is scoped to that class and to nothing else: the table's string rows are under #16785 (ruled C …) and its sum × percent row is not executed here either, so no non-temporal pair changes behaviour

PR #17559 makes the final clause false in two places at once. It re-cuts assertAggregateFieldTypeCompatible's scope from the temporal FIELD class to the DERIVING AGGREGATE class (sum / avg), so:

• every non-temporal sum / avg pair the table refuses now changes behaviour — 75 pairs, measured and enumerated on that PR;
• sum × percent is executed there, which the entry names specifically as one that is not.

(The entry also cites #16785, which does not resolve — HTTP 404, with its dense neighbours #16783/#16784/#16786/#16787 all resolving. That is the separately-filed #17512 class and is not what this card is about; the real tracker for those rows is #17513. Worth correcting in the same stroke since the text is being touched.)

Why it is a defect and not a nit — the consumers are named

ADR-0087 ledger entries are not commentary. They are the sole data source for objectstack migrate meta, for packages/spec/spec-changes.json, and for the generated docs/protocol-upgrade-guide.md. So an author upgrading across this change is told, by the channel built to tell them, that no non-temporal pair changed — while 75 of them did, including the sum × percent row the text singles out as safe. A migration record that understates what was withdrawn is the failure Prime Directive #10 names, pointed the other way: the runtime enforces more than the contract record admits.

⭐ It is also what #16778 itself treated as load-bearing. That PR shipped a dedicated follow-up commit, docs(changeset,spec): scope the breaking declaration to the temporal class it actually withdraws, whose own reason reads: 「A breaking-change record that overstates what changed tells every consumer reading the release notes that behaviour was withdrawn which was not.」 ⇒ The same standard in reverse is what this card asks for.

What a taker does

1. Widen the entry's surface to the population actually withdrawn — the temporal rows plus every sum / avg pair the table refuses — and drop the 「no non-temporal pair changes behaviour」 clause and the sum × percent exemption with it.
2. Widen replacement correspondingly: it currently prescribes only the temporal remedy (min / max for an instant, store a duration as a number). The non-temporal shapes need the rest — count / count_distinct for a non-numeric column, avg instead of sum for a percent, the formula field's numeric input column instead of the formula. PR feat(service-analytics)!: refuse a deriving aggregate over a field type that cannot carry it, for every field type and not only the temporal class #17559's changeset carries a FROM → TO table that can be lifted verbatim.
3. Re-point the #16785 citations at AGGREGATE_FIELD_TYPE_COMPATIBILITY refuses min/max over the string classes while 15 shipped end-to-end cases depend on them working — the table or the uses must give #17513.
4. ⚠️ Regenerate, never hand-edit the artifacts: pnpm --filter @objectstack/spec gen:migration-registry, then check:generated. feat(service-analytics)!: refuse an aggregate a datetime measure's field type cannot carry, and reconcile the storage-form annotations to one measured statement #16778's own landing notes say two consecutive runs must be byte-identical and the diff confined to this entry's block.
5. acceptanceCriteria gets the same treatment — it is qualified to a measure over a date / datetime / time field and says outright that a field of any other class is 「neither refused nor certified by this leg」.

Precedent for the shape of this card

#11950 — 「spec: register the #11566 maxLength narrowing in the ADR-0087 migration ledger (deferred from the enforcement PR — registry.ts was held)」. Same situation: an enforcement PR that could not touch registry.ts, with the ledger work carved into its own domain:spec card. This is that card for #16099.

Lane

packages/spec/src/migrations/registry.ts ⇒ domain:spec.

Refs: PR #17559 (the change that falsifies the sentence) · #16099 · #16737 / PR #16778 (wrote the entry) · #17513 (what #16785 should have been) · #17512 (the unresolvable-citation class) · #11950 (precedent)

Blocked-by: #16099

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Generated by Claude Code

[os-litant]

Triage: lands in packages/spec/src/migrations/registry.ts ⇒ domain:spec; type Bug, priority:p3, pm:blocked.

⚠️ Blocked, and the card says so honestly: 「Activates when PR #17559 merges. It is true of that PR's landing, ⛔ not of main today.」 Verified 2026-09-10T23:29:29Z — PR #17559 is open, not merged. ⇒ Correcting the sentence now would make the ledger wrong in the other direction.

Blocked-by: #16099 — the issue PR #17559 delivers (its residual 2), ⛔ not the PR number. ⭐ That choice is deliberate: a Blocked-by: naming a PR is a block no mechanism can lift, and this seat has hand-released two such cards this shift (#17479/#17481, #17536). Naming the issue means this one returns by itself.

⭐ The filer routed itself correctly and said why: packages/spec is fenced out of #16099's dispatch by the standing rule, so the correction has to be a domain:spec stroke. ⇒ ⛔ Not a failure of that card's scope; the fence working.

priority:p3: a surface sentence in a ledger entry, whose only readers are objectstack migrate meta and the upgrade guide. ⚠️ But those readers are exactly the ones a customer meets during an upgrade — which is why it is p3 rather than nothing.

_{Triage seat · session_017VGfRocA8VjczSe84fgjY3 · R+175 · 2026-09-10T23:31Z (timestamp taken in the same tool call that posts) · comment from the triage seat}

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Generated by Claude Code