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+---
+'@objectstack/runtime': patch
+---
+
+Clause-②: no
+Metadata-protocol: none
+
+`GET /packages/<base>/export` carries the base's own document again while its `.custom` pair's override of an item is live (measured for dashboard, report, page, app, dataset, doc and book) (ADR-0146 D8 item 3). On a boot that also holds the base's code documents in the metadata service, as every `defineStack` host does, the per-package layer listed only the override copy under the base's name, and the export's override filter (#29563) left the item out of the base's export. The export now serves the base's code artifact in that item's place, so the base's export is byte-identical with or without a published override, and still carries no `overrides` block.
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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * [#29649, ADR-0146 D8 item 3] "`GET /packages/hotcrm/export` carries the base
+ * unchanged" while its `.custom` pair's override of an item is live — on a base
+ * booted as the showcase boots, where the base's code documents are held twice:
+ * by the registry (`ObjectQL.registerApp`) AND by the metadata service
+ * (`MetadataPlugin`'s artifact door, which stamps each body with the base's
+ * envelope before it stores it).
+ *
+ * That second holder is what the #29563 pin
+ * (`packages-export-base-unchanged-per-type.integration.test.ts`) does not
+ * register, and why it stayed green while a real showcase boot lost the item:
+ * the per-package layer merges the registry's items over the metadata
+ * service's, one per `(name, package)` slot, and the published override is
+ * registered in the registry's bare slot wearing the base's envelope (#29600).
+ * So the base's slot of the name holds the override alone, and the export's
+ * "never an override of THIS package" filter (#29563) left nothing in it.
+ * Measured on a real showcase boot at b391feb1: dashboards 3 → 2, reports
+ * 4 → 3, views 36 → 36. #29640 (7dae3b3c) took the dashboard and report copy
+ * out of the bare slot; on a real showcase boot at 7dae3b3c a published page,
+ * app, dataset, doc or book override still dropped the item (pages 29 → 28,
+ * apps 1 → 0, datasets 4 → 3, docs 8 → 7, books 1 → 0).
+ *
+ * Per type (view, dashboard, report, and the five types #29640 left in the
+ * registry's bare slot: page, app, dataset, doc, book), over the real door
+ * (`HttpDispatcher.handlePackages`), the real protocol, the real `ObjectQL`
+ * engine on a SQLite file and the real `MetadataManager`:
+ *
+ *  - the base's export after the override is published is byte-identical to
+ *    the base's export before it, so the item is present and equal, and no
+ *    item in it carries an `overrides` block;
+ *  - the same holds on a restart over the same database;
+ *  - the pair's export carries the overriding item with its `overrides` block
+ *    (view, dashboard, report; see `pairServed`);
+ *  - CONTROL: the pair's override row is published, and for view, dashboard
+ *    and report the effective read of the base's name serves it, so the base
+ *    export's answer is the export's own.
+ */
+import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
+import { mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { ObjectQL } from '@objectstack/objectql';
+import { SqlDriver } from '@objectstack/driver-sql';
+import { MetadataManager } from '@objectstack/metadata';
+import { ObjectStackProtocolImplementation, resetEnvWritableMetadataTypes } from '@objectstack/metadata-protocol';
+import {
+    SysMetadataAuditObject,
+    SysMetadataCommitObject,
+    SysMetadataHistoryObject,
+    SysMetadataObject,
+} from '@objectstack/metadata-core';
+import { applyProtection } from '@objectstack/spec/shared';
+import { expandViewContainer } from '@objectstack/spec/ui';
+import { HttpDispatcher } from '../http-dispatcher.js';
+
+const BASE = 'com.example.showcase';
+const BASE_VERSION = '0.1.0';
+const PAIR = 'com.example.showcase.custom';
+const PLATFORM_PKG = 'com.objectstack.platform';
+const DECLARATION = { package: BASE, basedOn: BASE_VERSION } as const;
+
+const CALLER: any = {
+    request: {},
+    environmentId: 'platform',
+    executionContext: { userId: 'u_admin', isSystem: false, systemPermissions: ['manage_metadata', 'studio.access'] },
+};
+
+const OBJECT = 'showcase_task';
+const VIEW = `${OBJECT}.in_progress`;
+const DASHBOARD = 'showcase_ops_dashboard';
+const REPORT = 'showcase_hours_by_status';
+const OVERRIDE_LABEL = 'Edited label';
+
+const COLUMNS = [{ field: 'title' }, { field: 'status' }];
+const viewContainer = () => ({
+    object: OBJECT,
+    list: { label: 'All Tasks', type: 'grid', data: { provider: 'object', object: OBJECT }, columns: COLUMNS },
+    listViews: {
+        in_progress: { label: 'In Progress', type: 'grid', data: { provider: 'object', object: OBJECT }, columns: COLUMNS },
+    },
+});
+const dashboards = () => [
+    { name: 'showcase_chart_gallery', label: 'Chart Gallery', columns: 12, widgets: [] },
+    { name: DASHBOARD, label: 'Delivery Operations', columns: 12, widgets: [] },
+    { name: 'showcase_revenue_pulse', label: 'Revenue Pulse', columns: 12, widgets: [] },
+];
+const report = (name: string, label: string) => ({
+    name,
+    label,
+    type: 'summary',
+    dataset: 'showcase_task_metrics',
+    rows: ['status'],
+    values: ['task_count'],
+});
+const reports = () => [
+    report(REPORT, 'Hours by Status'),
+    report('showcase_task_overview', 'Task Overview'),
+];
+
+/**
+ * The base's collections the metadata service holds besides its views, as the
+ * artifact door files them: plural collection → metadata type. Every one is a
+ * type a `.custom` pair can publish an override of.
+ */
+const SERVICE_COLLECTIONS = {
+    apps: 'app',
+    pages: 'page',
+    datasets: 'dataset',
+    dashboards: 'dashboard',
+    reports: 'report',
+    docs: 'doc',
+    books: 'book',
+} as const;
+
+/**
+ * `pairServed`: whether the pair's export and the effective read serve the
+ * override. For the five types #29640 left in the bare slot neither does on
+ * this boot shape (the pair's per-package layer lists none of them, and the
+ * effective read serves the base's document; #29613), so only the base's half
+ * is pinned for them.
+ */
+const TYPES = [
+    { type: 'view', plural: 'viewItems', name: VIEW, pairServed: true },
+    { type: 'dashboard', plural: 'dashboards', name: DASHBOARD, pairServed: true },
+    { type: 'report', plural: 'reports', name: REPORT, pairServed: true },
+    { type: 'page', plural: 'pages', name: 'showcase_start_here', pairServed: false },
+    { type: 'app', plural: 'apps', name: 'showcase_app', pairServed: false },
+    { type: 'dataset', plural: 'datasets', name: 'showcase_task_metrics', pairServed: false },
+    { type: 'doc', plural: 'docs', name: 'showcase_index', pairServed: false },
+    { type: 'book', plural: 'books', name: 'showcase_manual', pairServed: false },
+] as const;
+
+/** The base's body, as the showcase's `defineStack` carries it: one fresh copy per reader. */
+function baseBody(): Record<string, any> {
+    return {
+        id: BASE,
+        name: 'showcase',
+        version: BASE_VERSION,
+        namespace: 'showcase',
+        objects: [{
+            name: OBJECT,
+            label: 'Task',
+            sharingModel: 'private',
+            fields: {
+                title: { name: 'title', label: 'Title', type: 'text' },
+                status: { name: 'status', label: 'Status', type: 'text' },
+            },
+        }],
+        datasets: [{
+            name: 'showcase_task_metrics',
+            label: 'Task Metrics',
+            object: OBJECT,
+            dimensions: [{ name: 'status', label: 'Status', field: 'status', type: 'string' }],
+            measures: [{ name: 'task_count', label: 'Tasks', aggregate: 'count' }],
+        }],
+        apps: [{ name: 'showcase_app', label: 'Showcase', navigation: [] }],
+        pages: [
+            { name: 'showcase_capability_map', label: 'Capability Map', type: 'app', regions: [] },
+            { name: 'showcase_start_here', label: 'Start Here', type: 'app', regions: [] },
+        ],
+        views: [viewContainer()],
+        dashboards: dashboards(),
+        reports: reports(),
+        docs: [
+            { name: 'showcase_docs_guide', label: 'Docs Guide', content: '# Docs guide' },
+            { name: 'showcase_index', label: 'Showcase', content: '# Showcase' },
+        ],
+        books: [{ name: 'showcase_manual', label: 'Showcase Manual', groups: [] }],
+    };
+}
+
+/**
+ * The metadata service's copy of the base's documents, stored as
+ * `MetadataPlugin`'s artifact door stores them: each body stamped with the
+ * base's envelope (`applyProtection`), a view container under its object and
+ * each view it expands to under its own name.
+ */
+async function metadataServiceOf(): Promise<MetadataManager> {
+    const manager = new MetadataManager({ formats: ['json'], loaders: [] });
+    const body = baseBody();
+    const stamp = <T extends Record<string, any>>(item: T): T =>
+        applyProtection(item as any, { packageId: BASE, packageVersion: BASE_VERSION }) as T;
+    for (const container of body.views) {
+        await manager.register('view', OBJECT, stamp(container), { notify: false });
+        for (const view of expandViewContainer(OBJECT, container)) {
+            await manager.register('view', view.name, stamp(view as any), { notify: false });
+        }
+    }
+    for (const [plural, type] of Object.entries(SERVICE_COLLECTIONS)) {
+        for (const item of body[plural]) await manager.register(type, item.name, stamp(item), { notify: false });
+    }
+    return manager;
+}
+
+let cleanup: Array<() => void | Promise<void>> = [];
+afterEach(async () => {
+    for (const c of cleanup.reverse()) await c();
+    cleanup = [];
+});
+
+const envSnapshot = { OS_HOME: process.env.OS_HOME, OS_METADATA_WRITABLE: process.env.OS_METADATA_WRITABLE };
+let home: string;
+beforeAll(() => {
+    home = mkdtempSync(join(tmpdir(), 'os-29649-home-'));
+    process.env.OS_HOME = home;
+});
+afterAll(() => {
+    for (const [k, v] of Object.entries(envSnapshot)) {
+        if (v === undefined) delete process.env[k];
+        else process.env[k] = v;
+    }
+    rmSync(home, { recursive: true, force: true });
+});
+beforeEach(() => {
+    delete process.env.OS_METADATA_WRITABLE;
+    ObjectStackProtocolImplementation.resetEnvWritableCache();
+    resetEnvWritableMetadataTypes();
+    vi.spyOn(console, 'warn').mockImplementation(() => {});
+});
+afterEach(() => { vi.restoreAllMocks(); });
+
+/** One boot over the SQLite file in `dir`; the pair is installed on the first boot only. */
+async function boot(dir: string, { installPair }: { installPair: boolean }) {
+    const driver = new SqlDriver({
+        client: 'better-sqlite3',
+        connection: { filename: join(dir, 'data.sqlite') },
+        useNullAsDefault: true,
+    });
+    const objects = [SysMetadataObject, SysMetadataHistoryObject, SysMetadataAuditObject, SysMetadataCommitObject] as any[];
+    await driver.initObjects(objects);
+
+    const engine = new ObjectQL();
+    engine.registerDriver(driver as any, true);
+    await engine.init();
+    for (const o of objects) engine.registry.registerObject(o, PLATFORM_PKG);
+    cleanup.push(() => engine.destroy());
+    engine.registerApp(baseBody());
+
+    const services = new Map<string, unknown>([['objectql', engine], ['metadata', await metadataServiceOf()]]);
+    const protocol: any = new ObjectStackProtocolImplementation(engine as any, () => services as any);
+    services.set('protocol', protocol);
+    const get = (name: string) => services.get(name) ?? null;
+    const dispatcher = new HttpDispatcher({ context: { getService: get }, getService: get, getServiceAsync: async (n: string) => get(n) } as any);
+
+    if (installPair) {
+        await protocol.installPackage({
+            manifest: {
+                id: PAIR, name: 'showcase-custom', version: '0.1.0', type: 'app',
+                namespace: 'showcase_custom', dependencies: { [BASE]: '^0' },
+            },
+        });
+    }
+
+    return {
+        protocol,
+        /** The pair's active (published) rows of `(type, name)`, read off the store. */
+        async publishedRows(type: string, name: string): Promise<unknown[]> {
+            return await driver.find('sys_metadata', { where: { type, name, package_id: PAIR, state: 'active' } });
+        },
+        async exported(id: string): Promise<Record<string, any>> {
+            const res = await dispatcher.handlePackages(`/${encodeURIComponent(id)}/export`, 'GET', undefined, {}, CALLER);
+            expect(res.response?.status, JSON.stringify(res.response?.body)).toBe(200);
+            const body: any = JSON.parse(JSON.stringify(res.response?.body ?? null));
+            return body?.data ?? body;
+        },
+        async override(type: string, name: string, item: Record<string, unknown>) {
+            const saved = await protocol.saveMetaItem({ type, name, item, mode: 'draft', packageId: PAIR });
+            expect(saved?.success, `the ${type} draft save`).toBe(true);
+            await protocol.publishMetaItem({ type, name, packageId: PAIR });
+        },
+    };
+}
+
+const itemsOf = (manifest: Record<string, any>, plural: string, name: string): any[] =>
+    (manifest[plural] ?? []).filter((item: any) => item?.name === name);
+
+/** Every exported item, across the collections, that carries an `overrides` block. */
+const overridingItems = (manifest: Record<string, any>): string[] => Object.entries(manifest)
+    .filter(([, value]) => Array.isArray(value))
+    .flatMap(([plural, value]) => (value as any[])
+        .filter((item) => item && typeof item === 'object' && 'overrides' in item)
+        .map((item) => `${plural}/${item.name}`));
+
+describe('[#29649] GET /packages/<base>/export carries the base unchanged on a showcase-shaped boot', () => {
+    for (const { type, plural, name, pairServed } of TYPES) {
+        it(`${type}: the base's export is byte-identical with the override published, and after a restart`, async () => {
+            const dir = mkdtempSync(join(tmpdir(), 'os-29649-db-'));
+            cleanup.push(() => rmSync(dir, { recursive: true, force: true }));
+
+            const door = await boot(dir, { installPair: true });
+            const before = await door.exported(BASE);
+            const shipped = itemsOf(before, plural, name);
+            expect(shipped, `the base's ${type} before the override`).toHaveLength(1);
+
+            await door.override(type, name, { ...shipped[0], label: OVERRIDE_LABEL, overrides: { ...DECLARATION } });
+
+            // CONTROL: the override is published, and, where the protocol serves
+            // it, the effective read of the base's name serves it.
+            expect(await door.publishedRows(type, name), `the pair's published ${type} row`).toHaveLength(1);
+            if (pairServed) {
+                const effective: any = await door.protocol.getMetaItem({ type, name, packageId: BASE });
+                expect(effective?.item?.label, `the effective ${type} read`).toBe(OVERRIDE_LABEL);
+            }
+
+            const after = await door.exported(BASE);
+            expect(itemsOf(after, plural, name), `the base's ${type} with the override live`).toEqual(shipped);
+            expect(overridingItems(after), `the base's export carries no override`).toEqual([]);
+            expect(JSON.stringify(after), `the base's whole export with the ${type} override live`).toBe(JSON.stringify(before));
+
+            if (pairServed) {
+                const pair = itemsOf(await door.exported(PAIR), plural, name);
+                expect(pair.map((item) => item.label), `the pair's ${type} export`).toEqual([OVERRIDE_LABEL]);
+                expect(pair[0].overrides).toEqual(DECLARATION);
+            }
+
+            // A restart over the same database: the published row is hydrated from storage.
+            const restarted = await boot(dir, { installPair: false });
+            expect(JSON.stringify(await restarted.exported(BASE)), `the base's whole export after a restart`).toBe(JSON.stringify(before));
+        });
+    }
+});