backend/src/itemFilters.ts

@@ -9,7 +9,17 @@ export interface ItemFilters {
   tagIds: number[];
   minPriceCents: number | null;
   maxPriceCents: number | null;
-  status: ItemStatus | null;
+  // Several statuses rather than one, because the control this exists to serve
+  // is not a status filter. "Not sold" is available-or-reserved on the
+  // storefront and available-or-reserved-or-pending in the admin, so it cannot
+  // be expressed as equality against a single value. A single-status filter is
+  // still expressible: it arrives as a list of one, which is how the admin's
+  // old `?status=sold` keeps working unchanged.
+  //
+  // Null means the caller expressed no preference, which is distinct from
+  // asking for every status — the storefront turns the first into its default
+  // and the second into an explicit list.
+  status: ItemStatus[] | null;
   // Storefront only: "just the items I have favorited". Which customer that
   // means is not part of the parsed filter — it comes from the session at build
   // time, so a query string can never name someone else's favorites.
@@ -28,6 +38,19 @@ const ITEM_STATUSES: readonly string[] = ['pending', 'available', 'reserved', 's
 // to refuse it themselves rather than the parser refusing it for everyone.
 export const NON_PUBLIC_STATUSES: readonly ItemStatus[] = ['pending'];
 
+// What the storefront lists when the caller expressed no preference. Named here
+// rather than implied by the absence of a parameter, because the absence is now
+// meaningful: before this change no status meant every status, and afterwards it
+// means these two. Anything reading a shared link from before will get the new
+// meaning, which is the accepted cost of the default changing.
+export const STOREFRONT_DEFAULT_STATUSES: readonly ItemStatus[] = ['available', 'reserved'];
+
+// What "All" can mean on the storefront, which is not all of them. Pending items
+// are excluded from every public read unconditionally, so a filter labelled All
+// must not promise the fourth — a label that delivers less than it says is the
+// shape this codebase keeps designing against.
+export const STOREFRONT_ALL_STATUSES: readonly ItemStatus[] = ['available', 'reserved', 'sold'];
+
 export interface BuiltFilter {
   clauses: string[];
   params: unknown[];
@@ -115,15 +138,39 @@ function parseTagIds(value: unknown): number[] {
   return tagIds;
 }
 
-function parseStatus(value: unknown): ItemStatus | null {
+// Comma-separated, matching how `tags` already works, so the two multi-value
+// parameters in this parser read the same way in a URL.
+//
+// An unrecognised name is refused rather than dropped. Silently ignoring one
+// would turn `?status=available,sold_out` into "available only" — narrower than
+// what was asked for, and indistinguishable from a filter that worked.
+function parseStatus(value: unknown): ItemStatus[] | null {
   const raw = singleValue(value, 'status');
   if (raw === null || raw === '') {
     return null;
   }
-  if (!ITEM_STATUSES.includes(raw)) {
+  const statuses: ItemStatus[] = [];
+  for (const part of raw.split(',')) {
+    const trimmed = part.trim();
+    if (trimmed === '') {
+      continue;
+    }
+    if (!ITEM_STATUSES.includes(trimmed)) {
       throw new FilterError('invalid status');
     }
-  return raw as ItemStatus;
+    // Duplicates are harmless in `= ANY(...)`, but removing them keeps the
+    // parsed filter a faithful description of what was asked for.
+    if (!statuses.includes(trimmed as ItemStatus)) {
+      statuses.push(trimmed as ItemStatus);
+    }
+  }
+  // `?status=,,` asked for something and named nothing. Returning null would
+  // silently mean "no status filter", which on the storefront now means the
+  // default rather than everything — a different answer from the one requested.
+  if (statuses.length === 0) {
+    throw new FilterError('invalid status');
+  }
+  return statuses;
 }
 
 function parseFavoritesOnly(value: unknown): boolean {
@@ -221,7 +268,10 @@ export function buildItemFilterSql(
 
   if (filters.status !== null) {
     params.push(filters.status);
-    clauses.push(`i.status = $${next}`);
+    // ANY rather than equality, so one status and several use the same clause.
+    // The ::text[] cast is explicit because `status` is a text column and the
+    // driver would otherwise have to infer the array's element type.
+    clauses.push(`i.status = ANY($${next}::text[])`);
     next++;
   }
 

backend/src/routes/items.ts

@@ -2,7 +2,14 @@ import { Router, Request, Response } from 'express';
 import { pool } from '../db';
 import { asyncRoute } from '../asyncRoute';
 import { PUBLIC_ITEM_SELECT } from '../itemSelect';
-import { parseItemFilters, buildItemFilterSql, FilterError, NON_PUBLIC_STATUSES } from '../itemFilters';
+import {
+  parseItemFilters,
+  buildItemFilterSql,
+  FilterError,
+  NON_PUBLIC_STATUSES,
+  STOREFRONT_DEFAULT_STATUSES,
+  STOREFRONT_ALL_STATUSES
+} from '../itemFilters';
 
 // Applied to every public read, unconditionally. This route has never had a
 // status filter of its own — sold items are listed and rendered with a Sold
@@ -38,11 +45,34 @@ router.get('/', asyncRoute(async (req: Request, res: Response) => {
   // admin routes, where 'pending' is valid, so it parses here too — and with
   // the exclusion below it would return an empty list, which reads as "no items
   // match" rather than "you may not ask that".
-  if (filters.status && NON_PUBLIC_STATUSES.includes(filters.status)) {
+  //
+  // Checked across every requested status, not just a single one: `?status=
+  // available,pending` must be refused for naming pending at all, rather than
+  // quietly answered because the first name in the list happened to be allowed.
+  if (filters.status?.some((status) => NON_PUBLIC_STATUSES.includes(status))) {
     return res.status(400).json({ error: 'invalid status' });
   }
 
-  const { clauses, params } = buildItemFilterSql(filters, 1, req.customerId ?? null);
+  // No preference means Not Sold rather than everything. Applied here rather
+  // than in the parser, which is shared with the admin, where the same absence
+  // has to go on meaning "every status including pending".
+  //
+  // Except when the customer asked for their own favorites, where the default
+  // stays everything. A favorite that has just sold is often exactly what the
+  // customer came to look at — they were emailed to say so — and hiding it
+  // would make an item they curated vanish without explanation. That was a
+  // deliberate decision before this filter existed, and defaulting favorites to
+  // Not Sold would have quietly reversed it. An explicit ?status= still wins,
+  // so the choice remains theirs.
+  const defaultStatuses = filters.favoritesOnly
+    ? STOREFRONT_ALL_STATUSES
+    : STOREFRONT_DEFAULT_STATUSES;
+  const effectiveFilters = {
+    ...filters,
+    status: filters.status ?? [...defaultStatuses]
+  };
+
+  const { clauses, params } = buildItemFilterSql(effectiveFilters, 1, req.customerId ?? null);
   const where = [EXCLUDE_PENDING, ...clauses].join(' AND ');
   const { rows } = await pool.query(
     `${PUBLIC_ITEM_SELECT} WHERE ${where} ORDER BY i.created_at DESC`,

backend/tests/integration/soldFilter.integration.test.ts

@@ -0,0 +1,196 @@
+import request from 'supertest';
+import app from '../../src/app';
+import { pool } from '../../src/db';
+import { resetDb, closeDb } from './setup/testDb';
+
+beforeEach(async () => {
+  await resetDb();
+});
+
+afterAll(async () => {
+  await pool.end();
+  await closeDb();
+});
+
+// Direct insert so a test can put an item in a specific state without going
+// through the transitions that put it there.
+async function insertItem(name: string, status: string): Promise<number> {
+  const { rows } = await pool.query(
+    `INSERT INTO items (name, price_cents, status) VALUES ($1, $2, $3) RETURNING id`,
+    [name, 10000, status]
+  );
+  return rows[0].id;
+}
+
+async function seedOneOfEach() {
+  await insertItem('Pending piece', 'pending');
+  await insertItem('Available piece', 'available');
+  await insertItem('Reserved piece', 'reserved');
+  await insertItem('Sold piece', 'sold');
+}
+
+const namesFrom = (body: { name: string }[]) => body.map((i) => i.name).sort();
+
+describe('the storefront status filter', () => {
+  // The product decision this change carries: with no filter the storefront no
+  // longer lists sold items. Asserted on the default rather than on the
+  // parameter, because the default is the part that changed for everyone.
+  it('lists neither sold nor pending items by default', async () => {
+    await seedOneOfEach();
+
+    const res = await request(app).get('/api/items');
+
+    expect(res.status).toBe(200);
+    expect(namesFrom(res.body)).toEqual(['Available piece', 'Reserved piece']);
+  });
+
+  it('lists only sold items when asked for them', async () => {
+    await seedOneOfEach();
+
+    const res = await request(app).get('/api/items?status=sold');
+
+    expect(namesFrom(res.body)).toEqual(['Sold piece']);
+  });
+
+  it('brings sold items back for an explicit All', async () => {
+    await seedOneOfEach();
+
+    const res = await request(app).get('/api/items?status=available,reserved,sold');
+
+    expect(namesFrom(res.body)).toEqual(['Available piece', 'Reserved piece', 'Sold piece']);
+  });
+
+  it('lists not-sold items for an explicit Not Sold, matching the default', async () => {
+    await seedOneOfEach();
+
+    const explicit = await request(app).get('/api/items?status=available,reserved');
+    const implied = await request(app).get('/api/items');
+
+    expect(namesFrom(explicit.body)).toEqual(namesFrom(implied.body));
+  });
+
+  // The guarantee that must survive the filter being generalised. Pending is
+  // excluded from every public read by a clause the caller cannot opt out of,
+  // and these assert it directly rather than trusting the parser to go on
+  // refusing the name.
+  describe('pending stays unreachable from the storefront', () => {
+    it('refuses a request naming pending on its own', async () => {
+      await seedOneOfEach();
+
+      const res = await request(app).get('/api/items?status=pending');
+
+      expect(res.status).toBe(400);
+      expect(res.body.error).toBe('invalid status');
+    });
+
+    // The case a single-value check would have let through: the list is refused
+    // for naming pending at all, not accepted because the first name is fine.
+    it('refuses a request naming pending among allowed statuses', async () => {
+      await seedOneOfEach();
+
+      const res = await request(app).get('/api/items?status=available,pending');
+
+      expect(res.status).toBe(400);
+      expect(res.body.error).toBe('invalid status');
+    });
+
+    it('never returns a pending item under any accepted combination', async () => {
+      await seedOneOfEach();
+
+      for (const query of ['', '?status=sold', '?status=available,reserved,sold', '?status=reserved']) {
+        const res = await request(app).get(`/api/items${query}`);
+        expect(res.status).toBe(200);
+        expect(res.body.map((i: { name: string }) => i.name)).not.toContain('Pending piece');
+      }
+    });
+  });
+
+  it('refuses an unknown status rather than ignoring it', async () => {
+    const res = await request(app).get('/api/items?status=available,sold_out');
+
+    expect(res.status).toBe(400);
+    expect(res.body.error).toBe('invalid status');
+  });
+});
+
+describe('the admin inventory status filter', () => {
+  // All means all four here, unlike the storefront. Same word, two meanings,
+  // which is why each is asserted where it applies rather than assumed shared.
+  it('lists every status including pending when none is named', async () => {
+    await seedOneOfEach();
+
+    const res = await request(app).get('/api/admin/items');
+
+    expect(namesFrom(res.body)).toEqual([
+      'Available piece',
+      'Pending piece',
+      'Reserved piece',
+      'Sold piece'
+    ]);
+  });
+
+  it('still accepts a single status, which is what the old dropdown sent', async () => {
+    await seedOneOfEach();
+
+    const res = await request(app).get('/api/admin/items?status=pending');
+
+    expect(namesFrom(res.body)).toEqual(['Pending piece']);
+  });
+
+  // Not Sold in the admin includes pending, which it does not on the storefront.
+  it('accepts a multi-status Not Sold that includes pending', async () => {
+    await seedOneOfEach();
+
+    const res = await request(app).get('/api/admin/items?status=available,reserved,pending');
+
+    expect(namesFrom(res.body)).toEqual(['Available piece', 'Pending piece', 'Reserved piece']);
+  });
+});
+
+describe('the favorites view keeps its own default', () => {
+  // Favorites defaulted to showing sold items before this filter existed, on
+  // the reasoning that a favorite which has just sold is often exactly what the
+  // customer came to look at — they were emailed to say so. Defaulting them to
+  // Not Sold alongside everything else would have quietly reversed that.
+  it('shows a sold favorite with no status named', async () => {
+    const agent = request.agent(app);
+    expect(
+      (await agent.post('/api/customers/register').send({
+        email: 'favdefault@example.com',
+        password: 'supersecret123',
+        firstName: 'Thom',
+        lastName: 'Lamb'
+      })).status
+    ).toBe(200);
+
+    const soldId = await insertItem('Sold favorite', 'sold');
+    const availableId = await insertItem('Available favorite', 'available');
+    expect((await agent.post(`/api/customers/me/favorites/${soldId}`)).status).toBeLessThan(300);
+    expect((await agent.post(`/api/customers/me/favorites/${availableId}`)).status).toBeLessThan(300);
+
+    const res = await agent.get('/api/items?favorites=1');
+
+    expect(res.status).toBe(200);
+    expect(namesFrom(res.body)).toEqual(['Available favorite', 'Sold favorite']);
+  });
+
+  // The default is a default, not an override: naming a status still wins.
+  it('honours an explicit Not Sold within the favorites view', async () => {
+    const agent = request.agent(app);
+    await agent.post('/api/customers/register').send({
+      email: 'favexplicit@example.com',
+      password: 'supersecret123',
+      firstName: 'Thom',
+      lastName: 'Lamb'
+    });
+
+    const soldId = await insertItem('Sold favorite', 'sold');
+    const availableId = await insertItem('Available favorite', 'available');
+    await agent.post(`/api/customers/me/favorites/${soldId}`);
+    await agent.post(`/api/customers/me/favorites/${availableId}`);
+
+    const res = await agent.get('/api/items?favorites=1&status=available,reserved');
+
+    expect(namesFrom(res.body)).toEqual(['Available favorite']);
+  });
+});

backend/tests/unit/itemFilters.test.ts

@@ -75,10 +75,41 @@ describe('parseItemFilters', () => {
     expect(() => parseItemFilters({ category: ['1', '2'] })).toThrow(FilterError);
   });
 
+  // A single status parses to a list of one, which is what lets the admin's
+  // existing ?status=sold keep working unchanged against the multi-value shape.
   it('parses each of the item statuses', () => {
-    expect(parseItemFilters({ status: 'available' }).status).toBe('available');
-    expect(parseItemFilters({ status: 'reserved' }).status).toBe('reserved');
-    expect(parseItemFilters({ status: 'sold' }).status).toBe('sold');
+    expect(parseItemFilters({ status: 'available' }).status).toEqual(['available']);
+    expect(parseItemFilters({ status: 'reserved' }).status).toEqual(['reserved']);
+    expect(parseItemFilters({ status: 'sold' }).status).toEqual(['sold']);
+    expect(parseItemFilters({ status: 'pending' }).status).toEqual(['pending']);
+  });
+
+  it('parses several statuses from one comma-separated value', () => {
+    expect(parseItemFilters({ status: 'available,reserved' }).status).toEqual([
+      'available',
+      'reserved'
+    ]);
+    expect(parseItemFilters({ status: ' available , sold ' }).status).toEqual([
+      'available',
+      'sold'
+    ]);
+  });
+
+  it('drops a repeated status rather than listing it twice', () => {
+    expect(parseItemFilters({ status: 'sold,sold' }).status).toEqual(['sold']);
+  });
+
+  // Refused rather than dropped. Ignoring the unknown name would turn this into
+  // "available only" - narrower than what was asked for, and indistinguishable
+  // from a filter that worked.
+  it('rejects a list containing an unknown status', () => {
+    expect(() => parseItemFilters({ status: 'available,sold_out' })).toThrow(FilterError);
+  });
+
+  // Asked for something, named nothing. Answering null would mean "no status
+  // filter", which on the storefront is the default rather than everything.
+  it('rejects a list that names nothing', () => {
+    expect(() => parseItemFilters({ status: ',,' })).toThrow(FilterError);
   });
 
   it('treats an absent or empty status as no status filter', () => {
@@ -145,8 +176,17 @@ describe('buildItemFilterSql', () => {
 
   it('filters on status', () => {
     const built = buildItemFilterSql(parseItemFilters({ status: 'reserved' }), 1, null);
-    expect(built.clauses.join(' ')).toContain('i.status');
-    expect(built.params).toEqual(['reserved']);
+    expect(built.clauses.join(' ')).toContain('i.status = ANY');
+    expect(built.params).toEqual([['reserved']]);
+  });
+
+  // One clause for one status and for several, which is the whole reason the
+  // filter was generalised rather than joined by a second dimension.
+  it('filters on several statuses with the same single clause', () => {
+    const built = buildItemFilterSql(parseItemFilters({ status: 'available,reserved' }), 1, null);
+    expect(built.clauses).toHaveLength(1);
+    expect(built.clauses[0]).toContain('i.status = ANY');
+    expect(built.params).toEqual([['available', 'reserved']]);
   });
 
   it('restricts to the favorites of the given customer', () => {

frontend/src/App.tsx

@@ -10,6 +10,7 @@ import theme from 'antd/es/theme';
 import Badge from 'antd/es/badge';
 import Empty from 'antd/es/empty';
 import Alert from 'antd/es/alert';
+import Segmented from 'antd/es/segmented';
 import { ShoppingCartOutlined, FilterOutlined } from '@ant-design/icons';
 import { Link, useLocation, useSearchParams } from 'react-router-dom';
 import { Item, FilterOptions, fetchItems, fetchFilterOptions } from './api';
@@ -19,10 +20,13 @@ import FilterDrawer from './components/FilterDrawer';
 import ActiveFilterChips from './components/ActiveFilterChips';
 import {
   ItemFilters,
+  SaleState,
+  STOREFRONT_SALE_STATUSES,
   activeFilterCount,
   filtersFromSearchParams,
   filtersToSearchParams,
-  hasActiveFilters
+  hasActiveFilters,
+  saleStateFromStatuses
 } from './filters';
 import AuthPromptModal from './customer/AuthPromptModal';
 import { useThemeMode } from './theme/ThemeContext';
@@ -248,6 +252,37 @@ export default function App() {
       </Header>
       <Content style={{ padding: 24 }}>
         <div className="filter-bar">
+          {/* In the bar rather than inside the drawer, deliberately. The default
+              now hides sold pieces, so a customer who never opens the drawer
+              would otherwise have no way to know sold items exist — and on a
+              one-of-a-kind catalogue the sold pieces are part of the story. */}
+          <Segmented
+            aria-label="Filter by availability"
+            // The fallback matches the server's: the favorites view defaults to
+            // everything, so the control must not claim Not Sold while sold
+            // favorites are on screen.
+            value={saleStateFromStatuses(
+              filters.status,
+              STOREFRONT_SALE_STATUSES,
+              filters.favoritesOnly ? 'all' : 'not-sold'
+            )}
+            onChange={(value) => {
+              const state = value as SaleState;
+              applyFilters({
+                ...filters,
+                // Not Sold is the default, so it is stored as "no preference"
+                // rather than as an explicit list. That keeps it out of the URL
+                // and out of the Filters (N) count, where it would otherwise
+                // show as an active filter nobody chose.
+                status: state === 'not-sold' ? null : STOREFRONT_SALE_STATUSES[state]
+              });
+            }}
+            options={[
+              { label: 'Not sold', value: 'not-sold' },
+              { label: 'Sold', value: 'sold' },
+              { label: 'All', value: 'all' }
+            ]}
+          />
           <Button
             icon={<FilterOutlined />}
             onClick={() => setDrawerOpen(true)}

frontend/src/admin/InventoryFilters.tsx

@@ -1,10 +1,19 @@
 import { useMemo } from 'react';
 import TreeSelect from 'antd/es/tree-select';
 import Select from 'antd/es/select';
+import Segmented from 'antd/es/segmented';
 import InputNumber from 'antd/es/input-number';
 import Button from 'antd/es/button';
 import type { Category, Tag } from '../api';
-import { ItemFilters, ItemStatus, buildCategoryTree, CategoryNode, hasActiveFilters } from '../filters';
+import {
+  ItemFilters,
+  SaleState,
+  ADMIN_SALE_STATUSES,
+  buildCategoryTree,
+  CategoryNode,
+  hasActiveFilters,
+  saleStateFromStatuses
+} from '../filters';
 
 interface CategoryTreeOption {
   value: number;
@@ -20,13 +29,6 @@ function toTreeData(nodes: CategoryNode[]): CategoryTreeOption[] {
   }));
 }
 
-const STATUS_OPTIONS: { value: ItemStatus; label: string }[] = [
-  { value: 'pending', label: 'Pending' },
-  { value: 'available', label: 'Available' },
-  { value: 'reserved', label: 'Reserved' },
-  { value: 'sold', label: 'Sold' }
-];
-
 interface Props {
   categories: Category[];
   tags: Tag[];
@@ -91,14 +93,32 @@ export default function InventoryFilters({ categories, tags, filters, onChange,
         onChange={(value) => onChange({ ...filters, maxPriceCents: dollarsToCents(value) })}
       />
 
-      <Select
-        allowClear
-        placeholder="Any status"
-        aria-label="Filter by status"
-        style={{ minWidth: 150 }}
-        value={filters.status ?? undefined}
-        onChange={(value: ItemStatus | undefined) => onChange({ ...filters, status: value ?? null })}
-        options={STATUS_OPTIONS}
+      {/* Replaces the four-way status dropdown that used to sit here. One
+          control instead of two overlapping ways to say the same thing.
+          Note what it costs: a single status can no longer be isolated, so
+          there is no longer a way to view only Reserved, or only Pending.
+          Not Sold folds pending in with available and reserved. If isolating
+          one status turns out to matter — the pending workflow from #90 is the
+          likeliest candidate — the fix is to put that back alongside this
+          preset, not to remove it. See the decision recorded on #105. */}
+      <Segmented
+        aria-label="Filter by availability"
+        value={saleStateFromStatuses(filters.status, ADMIN_SALE_STATUSES, 'all')}
+        onChange={(value) => {
+          const state = value as SaleState;
+          onChange({
+            ...filters,
+            // All is the admin's default, so it is held as "no preference"
+            // rather than as a list naming every status — which keeps it out of
+            // the active-filter count and out of Clear filters' way.
+            status: state === 'all' ? null : ADMIN_SALE_STATUSES[state]
+          });
+        }}
+        options={[
+          { label: 'Not sold', value: 'not-sold' },
+          { label: 'Sold', value: 'sold' },
+          { label: 'All', value: 'all' }
+        ]}
       />
 
       {hasActiveFilters(filters) && <Button onClick={onClear}>Clear filters</Button>}

frontend/src/filters.ts

@@ -7,15 +7,69 @@ export interface ItemFilters {
   tagIds: number[];
   minPriceCents: number | null;
   maxPriceCents: number | null;
-  // Only the admin Inventory tab sets this; the storefront leaves it null and
-  // shows every status, as it always has.
-  status: ItemStatus | null;
+  // Several statuses, because the control this serves is not a status filter:
+  // "Not Sold" is available-or-reserved on the storefront and includes pending
+  // in the admin, neither of which is one value.
+  //
+  // Null means "no preference", which each side turns into its own default -
+  // Not Sold on the storefront, every status in the admin. Keeping the default
+  // as null rather than as an explicit list is what keeps it out of the URL and
+  // out of the active-filter count.
+  status: ItemStatus[] | null;
   // Storefront only, and only meaningful when signed in. Sold favorites are
   // included: the storefront shows sold items everywhere else, and a favorite
   // that has just sold is often exactly what the customer came to look at.
   favoritesOnly: boolean;
 }
 
+// The three-way control both screens offer. It is a preset over the status
+// list rather than a filter of its own, so there is only ever one dimension and
+// no way to express a contradiction like "sold and not sold".
+export type SaleState = 'sold' | 'not-sold' | 'all';
+
+// The same three words mean different sets in the two places, which is worth
+// stating twice rather than sharing one table that would be wrong for one of
+// them. Pending is excluded from every public read regardless of filter, so on
+// the storefront "All" cannot and must not include it — a label promising more
+// than it delivers.
+export const STOREFRONT_SALE_STATUSES: Record<SaleState, ItemStatus[]> = {
+  'not-sold': ['available', 'reserved'],
+  sold: ['sold'],
+  all: ['available', 'reserved', 'sold']
+};
+
+// In the admin, Not Sold includes pending: an item awaiting publication has
+// certainly not been sold, and hiding it from the default view would hide the
+// items most likely to need attention.
+export const ADMIN_SALE_STATUSES: Record<SaleState, ItemStatus[]> = {
+  'not-sold': ['available', 'reserved', 'pending'],
+  sold: ['sold'],
+  all: ['available', 'reserved', 'sold', 'pending']
+};
+
+function isPublicStatus(value: string): value is ItemStatus {
+  return value === 'available' || value === 'reserved' || value === 'sold';
+}
+
+const sameSet = (a: readonly string[], b: readonly string[]) =>
+  a.length === b.length && [...a].sort().join() === [...b].sort().join();
+
+// Which preset a status list corresponds to, for showing the control's current
+// position. Null means no preference, which each screen renders as its default.
+// A list matching none of the three - only reachable by hand-editing the URL -
+// reports as the default rather than leaving the control blank.
+export function saleStateFromStatuses(
+  statuses: ItemStatus[] | null,
+  table: Record<SaleState, ItemStatus[]>,
+  fallback: SaleState = 'not-sold'
+): SaleState {
+  if (statuses === null) return fallback;
+  const match = (Object.keys(table) as SaleState[]).find((state) =>
+    sameSet(statuses, table[state])
+  );
+  return match ?? fallback;
+}
+
 export const EMPTY_FILTERS: ItemFilters = {
   categoryId: null,
   tagIds: [],
@@ -34,7 +88,7 @@ export function filtersToSearchParams(filters: ItemFilters): URLSearchParams {
   if (filters.tagIds.length) params.set('tags', filters.tagIds.join(','));
   if (filters.minPriceCents !== null) params.set('min_price', String(filters.minPriceCents));
   if (filters.maxPriceCents !== null) params.set('max_price', String(filters.maxPriceCents));
-  if (filters.status !== null) params.set('status', filters.status);
+  if (filters.status !== null) params.set('status', filters.status.join(','));
   if (filters.favoritesOnly) params.set('favorites', '1');
   return params;
 }
@@ -58,9 +112,18 @@ export function filtersFromSearchParams(params: URLSearchParams): ItemFilters {
   // fail. The admin's status filter holds its value in React state and never
   // round-trips through this function, so it is unaffected. Do not "complete"
   // this list to match the type.
+  //
+  // A list containing anything unreadable yields null - the default - rather
+  // than the readable subset, so a mangled link falls back to a view that is
+  // explainable instead of one silently narrower than it looks.
   const rawStatus = params.get('status');
-  const status = rawStatus === 'available' || rawStatus === 'reserved' || rawStatus === 'sold'
-    ? rawStatus
+  const parsedStatus = (rawStatus || '')
+    .split(',')
+    .map((part) => part.trim())
+    .filter((part) => part !== '');
+  const status =
+    parsedStatus.length > 0 && parsedStatus.every(isPublicStatus)
+      ? (parsedStatus as ItemStatus[])
       : null;
 
   const favorites = params.get('favorites');
@@ -77,18 +140,27 @@ export function filtersFromSearchParams(params: URLSearchParams): ItemFilters {
 
 // One count for the "Filters (N)" button. A price range counts once however
 // many ends are set, since it reads as a single filter to the user.
+//
+// Status is deliberately not counted. It has its own always-visible control
+// beside this button rather than living in the drawer, so counting it would put
+// a number on a button whose drawer shows nothing set — and the control already
+// displays its own position.
 export function activeFilterCount(filters: ItemFilters): number {
   let count = 0;
   if (filters.categoryId !== null) count++;
   count += filters.tagIds.length;
   if (filters.minPriceCents !== null || filters.maxPriceCents !== null) count++;
-  if (filters.status !== null) count++;
   if (filters.favoritesOnly) count++;
   return count;
 }
 
+// Broader than the count above, and intentionally so: this decides whether an
+// empty result reads as "no items match these filters" with a way out, or as an
+// empty shop. A status filter that matched nothing is exactly the case where
+// that distinction matters, so it counts here even though it is not in the
+// drawer's tally.
 export function hasActiveFilters(filters: ItemFilters): boolean {
-  return activeFilterCount(filters) > 0;
+  return activeFilterCount(filters) > 0 || filters.status !== null;
 }
 
 export interface CategoryNode extends Category {

frontend/tests/e2e/admin-inventory-filters.spec.ts

@@ -40,6 +40,15 @@ test.beforeAll(async ({ playwright }) => {
   await api.dispose();
 });
 
+// antd Segmented hides the real radio input behind a styled label, so the input
+// is found by role but cannot be clicked. The label carries a title attribute,
+// which is the same handle this suite already uses for antd Select options.
+// The input is still the right thing to assert checked-ness on: toBeChecked
+// does not require visibility.
+async function chooseAvailability(page: Page, label: string) {
+  await page.getByTitle(label, { exact: true }).click();
+}
+
 const row = (page: Page, name: string) => page.getByRole('row').filter({ hasText: name });
 
 // The Inventory table paginates and other specs create items concurrently, so
@@ -77,17 +86,28 @@ test.describe('Admin inventory filters', () => {
     await expect(row(page, NAMES.dear)).toHaveCount(0);
   });
 
-  test('filters by status, which is how Reserved is reached', async ({ page }) => {
+  // The four-way status dropdown is gone, replaced by the Sold / Not sold / All
+  // preset from #105. Isolating a single status went with it, so this no longer
+  // covers "which is how Reserved is reached" — that ability was given up
+  // deliberately and is recorded on the issue. What remains testable, and what
+  // matters, is that Sold and Not sold partition the inventory.
+  test('filters by availability', async ({ page }) => {
     await page.goto('/admin');
     await filterToOwnCategory(page);
 
-    await page.getByRole('combobox', { name: 'Filter by status' }).click();
-    await page.getByTitle('Sold', { exact: true }).click();
+    await chooseAvailability(page, 'Sold');
 
     // Every fixture is available, so a Sold filter must exclude them all.
     await expect(row(page, NAMES.cheap)).toHaveCount(0);
     await expect(row(page, NAMES.mid)).toHaveCount(0);
     await expect(row(page, NAMES.dear)).toHaveCount(0);
+
+    // And Not sold brings back exactly what Sold excluded, which is the property
+    // that makes the two-way split trustworthy rather than merely plausible.
+    await chooseAvailability(page, 'Not sold');
+    await expect(row(page, NAMES.cheap)).toBeVisible();
+    await expect(row(page, NAMES.mid)).toBeVisible();
+    await expect(row(page, NAMES.dear)).toBeVisible();
   });
 
   test('combines filters, and clearing restores them', async ({ page }) => {

frontend/tests/e2e/sold-filter.spec.ts

@@ -0,0 +1,113 @@
+import { test, expect } from './fixtures';
+
+// The storefront shows every item ever seeded and the e2e database is not reset
+// between runs, so every fixture carries a unique run id and assertions name
+// only the items this run created.
+const RUN = `s${Date.now().toString(36)}${Math.random().toString(36).slice(2, 7)}`;
+
+const NAMES = {
+  available: `Available piece ${RUN}`,
+  sold: `Sold piece ${RUN}`
+};
+
+// Scoped to the item's own grid cell: the SOLD ribbon sits outside the card,
+// and other runs' sold items share the page.
+const cell = (page: import('@playwright/test').Page, name: string) =>
+  page.locator('.ant-col').filter({ hasText: name });
+
+// antd Segmented hides the real radio input behind a styled label, so the input
+// is found by role but cannot be clicked. The label carries a title attribute,
+// which is the same handle this suite already uses for antd Select options.
+// The input is still the right thing to assert checked-ness on: toBeChecked
+// does not require visibility.
+async function chooseAvailability(page: import('@playwright/test').Page, label: string) {
+  await page.getByTitle(label, { exact: true }).click();
+}
+
+test.beforeAll(async ({ playwright }) => {
+  const api = await playwright.request.newContext({ baseURL: 'http://localhost:5173' });
+
+  for (const name of [NAMES.available, NAMES.sold]) {
+    const res = await api.post('/api/admin/items', {
+      multipart: { name, description: '', price: '250.00' }
+    });
+    expect(res.ok()).toBeTruthy();
+    const { id } = await res.json();
+    // Items arrive pending since #90, so publishing is what makes them public.
+    expect((await api.post(`/api/admin/items/${id}/mark-available`)).ok()).toBeTruthy();
+    if (name === NAMES.sold) {
+      expect((await api.post(`/api/admin/items/${id}/mark-sold`)).ok()).toBeTruthy();
+    }
+  }
+
+  await api.dispose();
+});
+
+test.describe('Filtering the storefront by availability', () => {
+  // The change customers actually see. Asserted on a bare visit rather than on
+  // a parameter, because the default is what changed for everyone.
+  test('hides sold pieces by default', async ({ page }) => {
+    await page.goto('/');
+
+    await expect(cell(page, NAMES.available)).toBeVisible();
+    await expect(cell(page, NAMES.sold)).toHaveCount(0);
+  });
+
+  test('All brings them back, ribbon and all', async ({ page }) => {
+    await page.goto('/');
+
+    await chooseAvailability(page, 'All');
+
+    await expect(cell(page, NAMES.sold)).toBeVisible();
+    await expect(cell(page, NAMES.sold)).toContainText('SOLD');
+    await expect(cell(page, NAMES.available)).toBeVisible();
+  });
+
+  test('Sold shows only the sold ones', async ({ page }) => {
+    await page.goto('/');
+
+    await chooseAvailability(page, 'Sold');
+
+    await expect(cell(page, NAMES.sold)).toBeVisible();
+    await expect(cell(page, NAMES.available)).toHaveCount(0);
+  });
+
+  // The filter is view state that belongs in the URL, like every other filter
+  // here, so a chosen view can be linked and survives a reload.
+  test('the choice survives a reload, because it lives in the URL', async ({ page }) => {
+    await page.goto('/');
+    await chooseAvailability(page, 'All');
+    await expect(cell(page, NAMES.sold)).toBeVisible();
+
+    await page.reload();
+
+    await expect(cell(page, NAMES.sold)).toBeVisible();
+    await expect(page.getByRole('radio', { name: 'All' })).toBeChecked();
+  });
+
+  // Not sold is the default, so it is held as "no preference" rather than as an
+  // explicit list. Putting it in the URL would make the default look like a
+  // choice somebody made, and would show it in the Filters (N) count.
+  test('returning to Not sold leaves no status in the URL', async ({ page }) => {
+    await page.goto('/');
+    await chooseAvailability(page, 'All');
+    await expect(page).toHaveURL(/status=/);
+
+    await chooseAvailability(page, 'Not sold');
+
+    await expect(page).not.toHaveURL(/status=/);
+    await expect(cell(page, NAMES.sold)).toHaveCount(0);
+  });
+
+  // The control sits beside the Filters button rather than inside the drawer,
+  // so its state must not be counted as one of the drawer's filters.
+  test('does not inflate the Filters count', async ({ page }) => {
+    await page.goto('/');
+    await chooseAvailability(page, 'Sold');
+
+    // Matched loosely and asserted on the text, because antd's icon contributes
+    // its own aria-label to the button's accessible name. The text is the part
+    // that would gain a "(1)" if status were counted as a drawer filter.
+    await expect(page.getByRole('button', { name: /Filters/ })).toHaveText('Filters');
+  });
+});