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+---
+'@objectstack/service-analytics': minor
+---
+
+fix(service-analytics)!: a caller-named analytics measure whose inferred source names no field (`_sum`, `*`, `*_sum`, an empty spelling) is refused with `INVALID_FIELD` / 400 at the analytics door, naming the spelling sent, on both strategies, before any statement is built (#21437)
+
+Clause-②: no (narrowing)
+
+<!-- adr-0087: not-required (no-migration-prescription) a refusal at the analytics door of a caller-named measure spelling whose inferred source names no field. No authorable key, spelling, export type or stored shape moves: AnalyticsQuerySchema still parses every measures list it parsed (the refusal is a runtime rule on the request, not a schema change), CubeSchema and DatasetSchema are untouched, a member a cube declares is never minted and is served as before, the package index exports the same names with the same types, and no stored row is read or rewritten. A refused spelling had no answer to preserve: both strategies answered 500 for it, and which column a caller meant by an empty prefix is not something a ledger entry can rewrite. The other categories are closed on facts: the package publishes (not unpublished); no ADR-0087 id covers a caller-named measure spelling, and this diff adds none (not registered / already-registered); and the change is runtime behaviour, not a declaration (not runtime-interface-only / type-surface-only). -->
+
+**BREAKING**: this narrows what `POST /api/v1/analytics/query` and its dry run `POST /api/v1/analytics/sql` accept in `measures`, on both strategies and every driver. It ships as `minor` under the launch-window convention for accept-set narrowings. No export, published type or error code changes.
+
+**The rule.** A `measures` entry the cube does not declare is inferred: the bare `count` counts rows (`COUNT(*)`), and any other spelling aggregates one of the object's own fields, named before an aggregation suffix (`_sum`, `_avg`, `_average`, `_min`, `_max`, `_count_distinct`) or, with no suffix, by the whole spelling. The bare `count` is now the only spelling that reads the row wildcard `'*'`. A spelling whose source is empty or is `'*'` names no field, and it is refused with `400 INVALID_FIELD` before anything is executed. The error names the spelling as it was sent (`member`, with `param: 'measures'` and `cube`); a `<cube>.` qualifier is kept in the name.
+
+**Before**, measured through `POST /api/v1/analytics/query` on SQLite, on the native-SQL and the ObjectQL strategy, on an ad-hoc cube and on an authored cube that does not declare the member:
+
+- `_sum`, `_avg`, `_average`, `_min`, `_max`, their `<cube>.`-qualified forms, `*`, `*_sum`, `*_avg` and the empty spelling `''` answered `500 DATABASE_ERROR`, after a statement reached the database (`SUM(*)`, `AVG(*)`, `SUM()`).
+- `_count_distinct` and `*_count_distinct` answered `500 DATABASE_ERROR` on the native-SQL strategy (`COUNT(DISTINCT *)`). On the ObjectQL strategy the engine answered `400 INVALID_QUERY` after the aggregate was called.
+- The qualifier alone (`<cube>.`) answered `403 PERMISSION_DENIED` from the member-shape gate. It now answers the same `400 INVALID_FIELD`, because it names no field either.
+
+**Now** each of those answers `400 INVALID_FIELD`, and no statement and no engine aggregate runs. `POST /api/v1/analytics/sql` refuses the same spellings instead of returning a statement that cannot run.
+
+**What to write instead.** Ask for `count` to count rows, or put the field's name before the suffix: the sum of `amount` is `amount_sum`.
+
+**Who is affected.** A caller that sent a measure spelling with nothing before the suffix, or the row wildcard itself. Every such request was already a 500. No example app, shipped dashboard, report, dataset, cube, doc or skill in this repository sends one. The console's analytics adapter composes a measure as the value field, an underscore and the aggregate function, so a widget whose value field is empty posts `_sum`. At the pinned `.objectui-sha` that adapter reads a 500 as an unknown failure and answers with its own client-side aggregation; it reads the 400 as a rejected request and surfaces it as an error.
+
+**Unchanged.** The bare `count`; a field-prefixed spelling such as `amount_sum`; the no-suffix spelling of a field (`amount`); a measure a cube declares, including one declared under a key such as `_sum`, which is the cube's own vocabulary and is never inferred; and the authored-position twin of this rule, the `@objectstack/spec` parse refusal of `'*'` outside a `count` on a cube or dataset measure (#21409).
@@ -0,0 +1,298 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * [#21437] A caller-named measure whose inferred source names no field is
+ * refused at the analytics door, `INVALID_FIELD` / 400 naming the spelling the
+ * caller sent, before either strategy reads anything.
+ *
+ * ## The shape this closes
+ *
+ * `inferMeasure` strips an aggregation suffix and aggregates what precedes it.
+ * For an EMPTY prefix it minted the row wildcard (`key.slice(…) || '*'`), so
+ * `_sum` became `{ type: 'sum', sql: '*' }`; the member-shape gate admits `'*'`
+ * as a column reference, and the strategies emit the operand verbatim.
+ * Measured through `POST /api/v1/analytics/query` on `origin/main`
+ * `713b0fa76` (the runtime dispatcher's door composition, SQLite, both
+ * strategies, an ad-hoc cube and an authored cube that does not declare the
+ * member): every suffix with an empty prefix answered `500 DATABASE_ERROR`
+ * after a statement reached the engine, except `_count_distinct` on the
+ * ObjectQL strategy, which the engine refused `400 INVALID_QUERY` after the
+ * aggregate was called. The same mint also passed the row wildcard and the
+ * empty string through VERBATIM — `*`, `*_sum`, `''` — with the same 500.
+ *
+ * ## What these pins hold
+ *
+ * - **The enumeration.** Every suffix `inferMeasure` strips — read from
+ *   `INFERRED_MEASURE_SUFFIXES`, the list the mint itself iterates, never
+ *   restated here — with an empty prefix, bare and `<cube>.`-qualified, on
+ *   both strategies, on an ad-hoc cube and on an authored cube that does not
+ *   declare the member, is refused `INVALID_FIELD` / 400 naming the spelling
+ *   sent, with zero raw statements and zero engine aggregates. So are the
+ *   other spellings whose source names no field (`*`, `*<suffix>`, `''`).
+ * - **The controls.** The bare `count` is still `COUNT(*)`; `amount_sum` and
+ *   an authored `amount_total` answer the true sum; a member an authored cube
+ *   DECLARES under an empty-prefix name (`CubeSchema` admits any measure key)
+ *   is the cube's own vocabulary, never minted, and is served.
+ * - **By construction.** For every caller spelling the corpus generates, the
+ *   source the member-shape gate reads (`inferredCallerMeasureSql`) is `'*'`
+ *   only for a spelling that reduces to `count`, so the gate's `'*'`
+ *   pass-through decides nothing about aggregates.
+ *
+ * `AnalyticsService.query()` / `generateSql()` are what the dispatcher's
+ * `POST /api/v1/analytics/query` and `/sql` routes call one-to-one, and the
+ * dispatcher carries a thrown `code` / `status` to the wire unchanged — the
+ * same `INVALID_FIELD` / 400 crossing is pinned at the route by
+ * `packages/runtime/src/analytics-json-dimension-door.test.ts`.
+ */
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import { ObjectQL } from '@objectstack/objectql';
+import { SqlDriver } from '@objectstack/driver-sql';
+import type { Cube } from '@objectstack/spec/data';
+import {
+  AnalyticsService,
+  INFERRED_MEASURE_SUFFIXES,
+  inferMeasure,
+  inferredCallerMeasureSql,
+} from '../analytics-service.js';
+import { AnalyticsServicePlugin } from '../plugin.js';
+
+const OBJECT = 'os21437_deal';
+
+const DEAL = {
+  name: OBJECT,
+  label: 'Caller measure ledger',
+  fields: {
+    title: { name: 'title', type: 'text' as const },
+    amount: { name: 'amount', type: 'number' as const },
+  },
+};
+
+const ROWS = [
+  { id: 'd1', title: 'x', amount: 100 },
+  { id: 'd2', title: 'x', amount: 300 },
+  { id: 'd3', title: 'y', amount: 1000 },
+] as const;
+
+/** Sum of `amount` over ROWS. */
+const TRUE_SUM = 1400;
+
+/** An authored cube that declares NO empty-prefix member: every one is minted. */
+const AUTHORED: Cube = {
+  name: 'os21437_cube',
+  title: 'Caller measure cube',
+  sql: OBJECT,
+  public: true,
+  measures: {
+    count: { type: 'count', sql: '*', label: 'Rows' },
+    amount_total: { type: 'sum', sql: 'amount', label: 'Total amount' },
+  },
+  dimensions: { title: { type: 'string', sql: 'title', label: 'Title' } },
+} as Cube;
+
+/** An authored cube that DECLARES a member under an empty-prefix name. */
+const DECLARES_EMPTY_PREFIX_NAME: Cube = {
+  name: 'os21437_declared_cube',
+  title: 'Declared empty-prefix name',
+  sql: OBJECT,
+  public: true,
+  measures: {
+    _sum: { type: 'sum', sql: 'amount', label: 'Total amount, under an empty-prefix key' },
+  },
+  dimensions: { title: { type: 'string', sql: 'title', label: 'Title' } },
+} as Cube;
+
+const SUFFIXES = INFERRED_MEASURE_SUFFIXES.map(([suffix]) => suffix);
+
+/** The other spellings whose source names no field: the wildcard, wildcard + suffix, empty. */
+const OTHER_NO_FIELD = ['*', ...SUFFIXES.map((s) => `*${s}`), ''];
+
+const SHAPES = [
+  { label: 'an ad-hoc cube', cube: OBJECT },
+  { label: 'an authored cube that does not declare the member', cube: AUTHORED.name },
+] as const;
+
+const FACES = ['native', 'objectql'] as const;
+type Face = (typeof FACES)[number];
+
+const quiet = { debug() {}, info() {}, warn() {}, error() {}, child() { return quiet; } };
+
+type Refusal = Error & { code?: string; status?: number; member?: string; param?: string; cube?: string; field?: string };
+
+const refusalOf = (pending: Promise<unknown>): Promise<Refusal> =>
+  pending.then<never, Refusal>(
+    () => {
+      throw new Error('expected the request to be refused, but it resolved');
+    },
+    (e) => e as Refusal,
+  );
+
+describe('[#21437] a caller-named measure whose source names no field — at the analytics door (sqlite)', () => {
+  let engine: ObjectQL;
+  /** Raw-SQL statements and engine aggregates that read THIS object. */
+  const reads = { rawSql: 0, aggregate: 0 };
+  const services: Partial<Record<Face, AnalyticsService>> = {};
+
+  const read = async (face: Face, cube: string, measures: readonly string[]) => {
+    const before = { ...reads };
+    const outcome = await services[face]!.query({ cube, measures: [...measures] } as any).then(
+      (res) => ({ res, err: undefined as Refusal | undefined }),
+      (err) => ({ res: undefined, err: err as Refusal }),
+    );
+    return { ...outcome, rawSql: reads.rawSql - before.rawSql, aggregate: reads.aggregate - before.aggregate };
+  };
+
+  beforeAll(async () => {
+    const driver = new SqlDriver({ client: 'better-sqlite3', connection: { filename: ':memory:' }, useNullAsDefault: true } as any);
+    engine = new ObjectQL({ logger: quiet } as any);
+    engine.registerDriver(driver, true);
+    await engine.init();
+    engine.registry.registerObject(DEAL as any);
+    await engine.syncSchemas();
+    for (const row of ROWS) await engine.insert(OBJECT, { ...row } as any);
+
+    const realExecute = (engine as any).execute.bind(engine);
+    (engine as any).execute = (sql: unknown, opts?: { object?: string }) => {
+      if (opts?.object === OBJECT) reads.rawSql += 1;
+      return realExecute(sql, opts);
+    };
+    const realAggregate = engine.aggregate.bind(engine);
+    (engine as any).aggregate = (object: string, ...rest: unknown[]) => {
+      if (object === OBJECT) reads.aggregate += 1;
+      return (realAggregate as any)(object, ...rest);
+    };
+
+    // The plugin's own composition over the real engine, both auto-bridges
+    // live; `objectql` narrows the capabilities to the engine-aggregate path.
+    for (const [face, caps] of [
+      ['native', undefined],
+      ['objectql', () => ({ nativeSql: false, objectqlAggregate: true, inMemory: false })],
+    ] as const) {
+      const registered: Record<string, unknown> = {};
+      await new AnalyticsServicePlugin({
+        cubes: [AUTHORED, DECLARES_EMPTY_PREFIX_NAME],
+        ...(caps ? { queryCapabilities: caps } : {}),
+      } as any).init({
+        getService: (name: string) => (name === 'data' ? engine : registered[name]),
+        registerService: (name: string, svc: unknown) => { registered[name] = svc; },
+        replaceService: (name: string, svc: unknown) => { registered[name] = svc; },
+        hook: () => {},
+        logger: quiet,
+      } as never);
+      services[face] = registered.analytics as AnalyticsService;
+    }
+  });
+
+  afterAll(async () => {
+    try { await engine?.destroy(); } catch { /* noop */ }
+  });
+
+  it('the enumeration reads the mint\'s own suffix list, and it is not empty', () => {
+    expect(SUFFIXES.length).toBeGreaterThan(0);
+  });
+
+  for (const face of FACES) {
+    describe(`${face} strategy`, () => {
+      for (const { label, cube } of SHAPES) {
+        it(`every suffix the mint strips, with an empty prefix, is refused INVALID_FIELD / 400 naming the spelling — ${label}`, async () => {
+          for (const spelling of SUFFIXES.flatMap((s) => [s, `${cube}.${s}`])) {
+            const { res, err, rawSql, aggregate } = await read(face, cube, [spelling]);
+            expect(res, `${spelling} must not be served`).toBeUndefined();
+            expect(err?.code, `${spelling}: ${err?.message}`).toBe('INVALID_FIELD');
+            expect(err?.status, spelling).toBe(400);
+            expect(err?.member, spelling).toBe(spelling);
+            expect(err?.param, spelling).toBe('measures');
+            expect(err?.cube, spelling).toBe(cube);
+            expect(err?.field, `${spelling}: there is no field to name`).toBeUndefined();
+            expect(err?.message, spelling).toContain(`Measure '${spelling}' on cube '${cube}'`);
+            expect(rawSql, `${spelling}: no raw statement ran`).toBe(0);
+            expect(aggregate, `${spelling}: no engine aggregate ran`).toBe(0);
+          }
+        });
+
+        it(`the other spellings whose source names no field (*, *<suffix>, '') are refused the same way — ${label}`, async () => {
+          for (const spelling of [...OTHER_NO_FIELD, `${cube}.*`, `${cube}.`]) {
+            const { res, err, rawSql, aggregate } = await read(face, cube, [spelling]);
+            expect(res, `${JSON.stringify(spelling)} must not be served`).toBeUndefined();
+            expect(err?.code, `${JSON.stringify(spelling)}: ${err?.message}`).toBe('INVALID_FIELD');
+            expect(err?.status, spelling).toBe(400);
+            expect(err?.member, spelling).toBe(spelling);
+            expect(err?.param, spelling).toBe('measures');
+            expect(rawSql + aggregate, `${JSON.stringify(spelling)}: nothing was read`).toBe(0);
+          }
+        });
+
+        it(`CONTROL the bare count is COUNT(*), and amount_sum is the true sum — ${label}`, async () => {
+          const count = await read(face, cube, ['count']);
+          expect(count.err, count.err?.message).toBeUndefined();
+          expect(Number(count.res!.rows[0]!.count)).toBe(ROWS.length);
+          const statement = await services[face]!.generateSql({ cube, measures: ['count'] } as any);
+          expect(statement.sql, 'the count reads the row wildcard').toMatch(/COUNT\(\*\)/i);
+
+          const sum = await read(face, cube, ['amount_sum']);
+          expect(sum.err, sum.err?.message).toBeUndefined();
+          expect(Number(sum.res!.rows[0]!.amount_sum)).toBe(TRUE_SUM);
+        });
+      }
+
+      it('CONTROL the authored cube\'s own amount_total is the true sum', async () => {
+        const { res, err } = await read(face, AUTHORED.name, ['amount_total']);
+        expect(err, err?.message).toBeUndefined();
+        expect(Number(res!.rows[0]!.amount_total)).toBe(TRUE_SUM);
+      });
+
+      it('CONTROL a member an authored cube DECLARES under an empty-prefix name is its own vocabulary — served, never minted', async () => {
+        const { res, err } = await read(face, DECLARES_EMPTY_PREFIX_NAME.name, ['_sum']);
+        expect(err, err?.message).toBeUndefined();
+        expect(Number(res!.rows[0]!._sum)).toBe(TRUE_SUM);
+      });
+
+      it('the dry-run door refuses what the query door refuses, and shows COUNT(*) for the control', async () => {
+        for (const spelling of SUFFIXES) {
+          const err = await refusalOf(services[face]!.generateSql({ cube: AUTHORED.name, measures: [spelling] } as any));
+          expect(err.code, `${spelling}: ${err.message}`).toBe('INVALID_FIELD');
+          expect(err.status, spelling).toBe(400);
+          expect(err.member, spelling).toBe(spelling);
+        }
+        const control = await services[face]!.generateSql({ cube: AUTHORED.name, measures: ['count'] } as any);
+        expect(control.sql).toMatch(/COUNT\(\*\)/i);
+      });
+    });
+  }
+});
+
+describe('[#21437] by construction: a \'*\' reaches the member-shape gate only together with count', () => {
+  const CUBE = AUTHORED.name;
+  const PREFIXES = ['', '*', '**', ' ', '_', 'amount', 'count'];
+  const TAILS = ['', ...SUFFIXES];
+  const QUALIFIERS = ['', `${CUBE}.`, 'other.'];
+  const CORPUS = [...new Set(QUALIFIERS.flatMap((q) => PREFIXES.flatMap((p) => TAILS.map((t) => `${q}${p}${t}`))))];
+  /** The spellings that reduce to the bare `count`, once the cube qualifier is stripped. */
+  const COUNT_SPELLINGS = new Set(['count', `${CUBE}.count`]);
+
+  it('for every caller spelling the corpus generates, the gate input is \'*\' only for count, and the mint pairs it with count', () => {
+    let wildcards = 0;
+    let refusals = 0;
+    for (const spelling of CORPUS) {
+      let source: string | null;
+      try {
+        source = inferredCallerMeasureSql(spelling, CUBE);
+      } catch (e) {
+        const err = e as Refusal;
+        expect(err.code, `${JSON.stringify(spelling)}: ${err.message}`).toBe('INVALID_FIELD');
+        expect(err.status, spelling).toBe(400);
+        expect(err.member, spelling).toBe(spelling);
+        refusals += 1;
+        continue;
+      }
+      if (source !== '*') continue;
+      wildcards += 1;
+      expect(COUNT_SPELLINGS.has(spelling), `${JSON.stringify(spelling)} reaches the gate as '*' but is not count`).toBe(true);
+      const key = spelling.startsWith(`${CUBE}.`) ? spelling.slice(CUBE.length + 1) : spelling;
+      expect(inferMeasure(key, { member: spelling, cube: CUBE }).type, spelling).toBe('count');
+    }
+    // The corpus must exercise both arms, or this pin could pass over nothing.
+    expect(wildcards, 'the count spellings reached the gate as the row wildcard').toBe(COUNT_SPELLINGS.size);
+    expect(refusals, 'the no-field spellings were refused').toBeGreaterThanOrEqual(2 * SUFFIXES.length);
+  });
+});