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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * A keyset walk by `id` visits every row once, in the driver's own order
+ * (#29398 item 1) — the query shape of the organization-membership completion
+ * read in `@objectstack/core` (`readOrganizationMembersToCompletion`): pages
+ * of `{ organization_id, id: { $gt: after } }`, `orderBy id asc`, a `limit`,
+ * the columns `id` and `user_id`, resuming after each full page's last id.
+ *
+ * The resolver cannot check the order itself, because the order is the
+ * driver's (a SQL database's collation, not JavaScript's code points); the
+ * walk is correct exactly when the cursor and the order share one comparison.
+ * This pins that for this driver: the pages, joined, are the sequence of one
+ * unpaged ordered read, holding every row of the organization once and no row
+ * of another. The ids are mixed-case nanoid-alphabet values, no two equal
+ * after case folding. The same pin lives in driver-sql (per dialect cell),
+ * driver-sqlite-wasm, driver-turso and driver-mongodb; the drivers' shared
+ * conformance cases live in `@objectstack/spec/data`, which this change does
+ * not edit.
+ */
+
+import { describe, it, expect, beforeAll } from 'vitest';
+import { InMemoryDriver } from './memory-driver.js';
+
+const TABLE = 'sys_member';
+const ORG = 'org_walked';
+const OTHER_ORG = 'org_other';
+
+/** The organization walked: sixteen ids, no two equal after case folding. */
+const MEMBER_IDS = [
+  'AC', 'Ab9', 'B-2', 'a-c', 'aB3', 'ab', 'b_1', '0Zz',
+  'Z0', 'z_9', '_x', '-y', 'Mm', 'mN1', 'n', 'Q-q',
+] as const;
+/** Another organization's rows, interleaved with the walked ones. */
+const OTHER_IDS = ['Aa', 'b', 'zZ'] as const;
+
+/** Page sizes: one row, a mid-run boundary, an exact multiple (16 = 4 x 4), the whole set. */
+const PAGE_SIZES = [1, 3, 4, 16] as const;
+
+const userIdOf = (id: string) => `user_${id}`;
+
+describe("InMemoryDriver — a keyset walk by id visits every member once, in the driver's order (#29398)", () => {
+  let driver: InMemoryDriver;
+
+  beforeAll(async () => {
+    driver = new InMemoryDriver({ persistence: false });
+    await driver.connect();
+    const rows = [
+      ...MEMBER_IDS.map((id) => ({ id, organization_id: ORG, user_id: userIdOf(id) })),
+      ...OTHER_IDS.map((id) => ({ id, organization_id: OTHER_ORG, user_id: userIdOf(id) })),
+    ];
+    for (const row of rows) await driver.create(TABLE, row);
+  });
+
+  /** The completion read's loop: resume after the last id of each full page. */
+  const walk = async (pageSize: number) => {
+    const visited: Array<Record<string, unknown>> = [];
+    let after: unknown;
+    let reads = 0;
+    for (;;) {
+      const where = after === undefined
+        ? { organization_id: ORG }
+        : { organization_id: ORG, id: { $gt: after } };
+      const page: Array<Record<string, unknown>> = await driver.find(
+        TABLE,
+        { where, orderBy: [{ field: 'id', order: 'asc' }], limit: pageSize, fields: ['id', 'user_id'] },
+      );
+      reads += 1;
+      // A driver that ignores the cursor would page forever: fail instead of hanging.
+      expect(reads, 'the walk did not end; the cursor is not narrowing the read').toBeLessThanOrEqual(MEMBER_IDS.length + 1);
+      visited.push(...page);
+      if (page.length < pageSize) break;
+      after = page[page.length - 1]!.id;
+    }
+    return { visited, reads };
+  };
+
+  /** The driver's own order, read once without a page boundary to cross. */
+  const ordered = async () => {
+    const rows: Array<Record<string, unknown>> = await driver.find(
+      TABLE,
+      { where: { organization_id: ORG }, orderBy: [{ field: 'id', order: 'asc' }], fields: ['id', 'user_id'] },
+    );
+    return rows.map((r) => String(r.id));
+  };
+
+  for (const pageSize of PAGE_SIZES) {
+    it(`pages of ${pageSize}: every member once, no other organization's row, in one ordered read's sequence`, async () => {
+      const { visited, reads } = await walk(pageSize);
+      const ids = visited.map((r) => String(r.id));
+
+      expect(ids).toEqual(await ordered());
+      expect([...ids].sort()).toEqual([...MEMBER_IDS].sort());
+      expect(new Set(ids).size).toBe(MEMBER_IDS.length);
+      for (const row of visited) expect(row.user_id).toBe(userIdOf(String(row.id)));
+      expect(reads).toBe(Math.floor(MEMBER_IDS.length / pageSize) + 1);
+    });
+  }
+});
@@ -0,0 +1,112 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * A keyset walk by `id` visits every row once, in the driver's own order
+ * (#29398 item 1) — the query shape of the organization-membership completion
+ * read in `@objectstack/core` (`readOrganizationMembersToCompletion`): pages
+ * of `{ organization_id, id: { $gt: after } }`, `orderBy id asc`, a `limit`,
+ * the columns `id` and `user_id`, resuming after each full page's last id.
+ *
+ * The resolver cannot check the order itself, because the order is the
+ * driver's (a SQL database's collation, not JavaScript's code points); the
+ * walk is correct exactly when the cursor and the order share one comparison.
+ * This pins that for this driver: the pages, joined, are the sequence of one
+ * unpaged ordered read, holding every row of the organization once and no row
+ * of another. The ids are mixed-case nanoid-alphabet values, no two equal
+ * after case folding. The same pin lives in driver-memory, driver-sql (per dialect cell),
+ * driver-sqlite-wasm and driver-turso; the drivers' shared
+ * conformance cases live in `@objectstack/spec/data`, which this change does
+ * not edit.
+ *
+ * Like this package's other live suites it needs a real mongod and is opt-in
+ * (`test-mongod.ts`): without one it is a named skip.
+ */
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import type { MongoMemoryServer } from 'mongodb-memory-server';
+import { MongoDBDriver } from './mongodb-driver.js';
+import { createTestMongod } from './test-mongod.js';
+
+const TABLE = 'sys_member';
+const ORG = 'org_walked';
+const OTHER_ORG = 'org_other';
+
+/** The organization walked: sixteen ids, no two equal after case folding. */
+const MEMBER_IDS = [
+  'AC', 'Ab9', 'B-2', 'a-c', 'aB3', 'ab', 'b_1', '0Zz',
+  'Z0', 'z_9', '_x', '-y', 'Mm', 'mN1', 'n', 'Q-q',
+] as const;
+/** Another organization's rows, interleaved with the walked ones. */
+const OTHER_IDS = ['Aa', 'b', 'zZ'] as const;
+
+/** Page sizes: one row, a mid-run boundary, an exact multiple (16 = 4 x 4), the whole set. */
+const PAGE_SIZES = [1, 3, 4, 16] as const;
+
+const userIdOf = (id: string) => `user_${id}`;
+
+const sharedMongod: MongoMemoryServer | undefined = await createTestMongod('member keyset walk conformance');
+
+describe.skipIf(!sharedMongod)("driver-mongodb — a keyset walk by id visits every member once, in the driver's order (#29398)", () => {
+  const mongod = sharedMongod as MongoMemoryServer;
+  let driver: MongoDBDriver;
+
+  beforeAll(async () => {
+    driver = new MongoDBDriver({ url: mongod.getUri(), database: 'member_keyset_walk_conformance' });
+    await driver.connect();
+    const rows = [
+      ...MEMBER_IDS.map((id) => ({ id, organization_id: ORG, user_id: userIdOf(id) })),
+      ...OTHER_IDS.map((id) => ({ id, organization_id: OTHER_ORG, user_id: userIdOf(id) })),
+    ];
+    for (const row of rows) await driver.create(TABLE, row);
+  }, 90_000);
+
+  afterAll(async () => {
+    if (driver) await driver.disconnect();
+    if (sharedMongod) await sharedMongod.stop();
+  });
+
+  /** The completion read's loop: resume after the last id of each full page. */
+  const walk = async (pageSize: number) => {
+    const visited: Array<Record<string, unknown>> = [];
+    let after: unknown;
+    let reads = 0;
+    for (;;) {
+      const where = after === undefined
+        ? { organization_id: ORG }
+        : { organization_id: ORG, id: { $gt: after } };
+      const page: Array<Record<string, unknown>> = await driver.find(
+        TABLE,
+        { where, orderBy: [{ field: 'id', order: 'asc' }], limit: pageSize, fields: ['id', 'user_id'] },
+      );
+      reads += 1;
+      // A driver that ignores the cursor would page forever: fail instead of hanging.
+      expect(reads, 'the walk did not end; the cursor is not narrowing the read').toBeLessThanOrEqual(MEMBER_IDS.length + 1);
+      visited.push(...page);
+      if (page.length < pageSize) break;
+      after = page[page.length - 1]!.id;
+    }
+    return { visited, reads };
+  };
+
+  /** The driver's own order, read once without a page boundary to cross. */
+  const ordered = async () => {
+    const rows: Array<Record<string, unknown>> = await driver.find(
+      TABLE,
+      { where: { organization_id: ORG }, orderBy: [{ field: 'id', order: 'asc' }], fields: ['id', 'user_id'] },
+    );
+    return rows.map((r) => String(r.id));
+  };
+
+  for (const pageSize of PAGE_SIZES) {
+    it(`pages of ${pageSize}: every member once, no other organization's row, in one ordered read's sequence`, async () => {
+      const { visited, reads } = await walk(pageSize);
+      const ids = visited.map((r) => String(r.id));
+
+      expect(ids).toEqual(await ordered());
+      expect([...ids].sort()).toEqual([...MEMBER_IDS].sort());
+      expect(new Set(ids).size).toBe(MEMBER_IDS.length);
+      for (const row of visited) expect(row.user_id).toBe(userIdOf(String(row.id)));
+      expect(reads).toBe(Math.floor(MEMBER_IDS.length / pageSize) + 1);
+    });
+  }
+});
@@ -0,0 +1,135 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * A keyset walk by `id` visits every row once, in the driver's own order
+ * (#29398 item 1) — the query shape of the organization-membership completion
+ * read in `@objectstack/core` (`readOrganizationMembersToCompletion`).
+ *
+ * That read pages `sys_member` with `{ organization_id, id: { $gt: after } }`,
+ * `orderBy id asc`, a `limit`, and the columns `id` and `user_id`, resuming
+ * after the last id of each full page. Its correctness rests on the driver,
+ * and on nothing the resolver can check for itself: the order is the
+ * database's collation, not JavaScript's code-point order (PostgreSQL with an
+ * ICU `en-US` database sorts `a-c ab aB3 Ab9 AC b_1 B-2`, a `C.UTF-8` one
+ * sorts `AC Ab9 B-2 a-c aB3 ab b_1`), so a resolver-side "each id is greater
+ * than the last" check would refuse every correct page on such a database.
+ * The keyset is collation-safe because `ORDER BY id` and `id > ?` use the
+ * same comparison. This file pins exactly that, per dialect cell: the pages,
+ * joined, are the same sequence as one unpaged ordered read, and that sequence
+ * holds every row of the organization once and no row of another.
+ *
+ * The ids are mixed-case nanoid-alphabet values (letters of both cases,
+ * digits, `-`, `_`), so a cell whose collation folds case or weighs
+ * punctuation differently still walks a real non-code-point order. No two
+ * ids are equal after case folding: a case-insensitive primary key (MySQL's
+ * `utf8mb4_0900_ai_ci`) would refuse such a pair at insert, which is a
+ * different fact from the one pinned here.
+ *
+ * Each driver package carries its own copy of this pin (driver-memory,
+ * driver-sqlite-wasm, driver-turso, driver-mongodb): the drivers' shared
+ * conformance cases live in `@objectstack/spec/data`, which this change does
+ * not edit.
+ */
+
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import { SqlDriver } from './index.js';
+import { DIALECT_CELLS, declareUnprovisionedCell, type DialectCell } from './live-dialect-matrix.testkit.js';
+
+/** Issue-prefixed: the live cells share a database with every other suite in this package. */
+const TABLE = 'os29398_member_keyset';
+const ORG = 'org_walked';
+const OTHER_ORG = 'org_other';
+
+/** The organization walked: sixteen ids, no two equal after case folding. */
+const MEMBER_IDS = [
+  'AC', 'Ab9', 'B-2', 'a-c', 'aB3', 'ab', 'b_1', '0Zz',
+  'Z0', 'z_9', '_x', '-y', 'Mm', 'mN1', 'n', 'Q-q',
+] as const;
+/** Another organization's rows, interleaved with the walked ones in any collation. */
+const OTHER_IDS = ['Aa', 'b', 'zZ'] as const;
+
+/** Page sizes: one row, a mid-run boundary, an exact multiple (16 = 4 x 4), the whole set. */
+const PAGE_SIZES = [1, 3, 4, 16] as const;
+
+const READ_OPTIONS = { bypassTenantAudit: true } as const;
+
+const userIdOf = (id: string) => `user_${id}`;
+
+for (const cell of DIALECT_CELLS) {
+  if (!cell.available) {
+    declareUnprovisionedCell(cell, 'member keyset walk conformance');
+    continue;
+  }
+  declareWalk(cell);
+}
+
+function declareWalk(cell: DialectCell): void {
+  describe(`SqlDriver — a keyset walk by id visits every member once, in the driver's order (#29398) (${cell.label})`, () => {
+    let driver: SqlDriver;
+
+    beforeAll(async () => {
+      driver = new SqlDriver(cell.config());
+      await driver.execute(`drop table if exists ${TABLE}`).catch(() => {});
+      await driver.initObjects([
+        { name: TABLE, fields: { organization_id: { type: 'string' }, user_id: { type: 'string' } } } as any,
+      ]);
+      const rows = [
+        ...MEMBER_IDS.map((id) => ({ id, organization_id: ORG, user_id: userIdOf(id) })),
+        ...OTHER_IDS.map((id) => ({ id, organization_id: OTHER_ORG, user_id: userIdOf(id) })),
+      ];
+      for (const row of rows) await driver.create(TABLE, row, READ_OPTIONS);
+    });
+
+    afterAll(async () => {
+      await driver?.execute(`drop table if exists ${TABLE}`).catch(() => {});
+      await driver?.disconnect?.();
+    });
+
+    /** The completion read's loop: resume after the last id of each full page. */
+    const walk = async (pageSize: number) => {
+      const visited: Array<Record<string, unknown>> = [];
+      let after: unknown;
+      let reads = 0;
+      for (;;) {
+        const where = after === undefined
+          ? { organization_id: ORG }
+          : { organization_id: ORG, id: { $gt: after } };
+        const page: Array<Record<string, unknown>> = await driver.find(
+          TABLE,
+          { where, orderBy: [{ field: 'id', order: 'asc' }], limit: pageSize, fields: ['id', 'user_id'] },
+          READ_OPTIONS,
+        );
+        reads += 1;
+        // A driver that ignores the cursor would page forever: fail instead of hanging.
+        expect(reads, 'the walk did not end; the cursor is not narrowing the read').toBeLessThanOrEqual(MEMBER_IDS.length + 1);
+        visited.push(...page);
+        if (page.length < pageSize) break;
+        after = page[page.length - 1]!.id;
+      }
+      return { visited, reads };
+    };
+
+    /** The driver's own order, read once without a page boundary to cross. */
+    const ordered = async () => {
+      const rows: Array<Record<string, unknown>> = await driver.find(
+        TABLE,
+        { where: { organization_id: ORG }, orderBy: [{ field: 'id', order: 'asc' }], fields: ['id', 'user_id'] },
+        READ_OPTIONS,
+      );
+      return rows.map((r) => String(r.id));
+    };
+
+    for (const pageSize of PAGE_SIZES) {
+      it(`pages of ${pageSize}: every member once, no other organization's row, in one ordered read's sequence`, async () => {
+        const { visited, reads } = await walk(pageSize);
+        const ids = visited.map((r) => String(r.id));
+
+        expect(ids).toEqual(await ordered());
+        expect([...ids].sort()).toEqual([...MEMBER_IDS].sort());
+        expect(new Set(ids).size).toBe(MEMBER_IDS.length);
+        for (const row of visited) expect(row.user_id).toBe(userIdOf(String(row.id)));
+        expect(reads).toBe(Math.floor(MEMBER_IDS.length / pageSize) + 1);
+      });
+    }
+  });
+}