docs(tmdb): replace catalog titles in matching examples with stand-ins (#1658)

* docs(tmdb): replace catalog titles in matching examples with stand-ins The Cyrillic and Arabic examples that document title folding were taken straight from a user's own portal catalog while the folding bugs were being diagnosed, and they spread from there into comments, fixtures, assertions and the architecture doc. A public repository is not the place for someone's viewing inventory, and the TMDB ids pinned alongside them identify the exact shows. Swap in stand-ins that reproduce the property under test rather than the title: a word whose "й" folds away, one whose "ё" does, a two-word title carrying a season marker, an Arabic phrase whose initial hamza decomposes into a separate word. Every replacement was run through the real `normalizeTitle` and `cleanTitleForSearch` before being written, so the folded keys, the wire queries and the cache lookup keys are the same shape as before — "Лейка" and "Леика" still meet on one key while staying two different searches, and "AR| أمثلة تجريبية" still keys as a hamza split into a space. Real TMDB ids become synthetic ones. One channel fixture that read as a film title becomes a plain channel name. Deliberately left alone: the leading-tag rule's "Akira | 1988" / "Момо | Momo" examples in `title-normalization.util.ts`. Those are not an inventory — they are the evidence for a regex decision measured over 1.27M catalog titles, and inventing replacements would document a measurement that never happened. No release note: comments, fixtures and docs only, with no behaviour change. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(tmdb): label the folding stand-ins as illustrative, not as history Review caught that the substitution left synthetic titles inside sentences that assert observed fact: the architecture doc claimed a particular folded query "returns zero results while `Лейка` returns the show" and named the stand-ins as the titles that were searched, missed and negatively cached, and several comments read the same way. The titles never existed, so the reading is wrong in the one direction that matters — a future reader debugging a regression would take them for production evidence. Keep the claim that is actually established, which is a class-level one: under the old single-form design every Cyrillic title carrying "й"/"ё" and every Arabic title carrying a hamza form was searched folded, missed, and cached as missing for the negative TTL. Present the strings themselves as illustrative stand-ins chosen to fold the same way. The verified invariant — what NFD does to those letters, and what the two tiers therefore produce — is unchanged and still assertable, because it is a property of the text rather than of any title. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(tmdb): finish the sweep — a missed cache key and a last observed-fact claim Two spots the first pass left behind: - `tmdb-search-cache-cleanup.spec.ts` kept a catalog-derived lookup key verbatim. Only the TMDB id beside it had been swapped, because the sweep matched the title in its display casing and the key stores it lowercased — so one item of the inventory stayed in the repository, twice. - `SearchTitleVariant`'s doc comment still asserted that one specific folded string finds nothing on TMDB. State the mechanism instead: folding rewrites the letters the search matches on, so the folded form finds nothing there. `content-search.util.sqlite.spec.ts` gets a channel fixture that no longer reads as a film title. `search-text-fold.util.spec.ts` is deliberately left alone. Its "Ёлки" is a common noun sitting in a Unicode corpus beside "Amélie", "İnşaat" and "Ά", not an inventory entry — and its rows are precomposed/decomposed PAIRS (U+0401 against U+0415 U+0308). A textual substitution rewrites only the composed half and silently turns the pair into two different words; doing it failed that spec, which is what a fixture encoding an invisible property is for. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(search): finish the fold fixtures by rewriting both halves of the pair The last two occurrences lived in the Unicode fold corpus, which an earlier attempt left alone after a textual substitution failed the spec. The reason it failed is the point: one row is a precomposed/decomposed PAIR — U+0401 against U+0415 U+0308 — asserting that both spellings fold to one string. Replacing the visible text rewrites only the composed half and silently turns the pair into two different words, which is not a thing a reader or a regex can see. Rewrite both halves by code point instead, keeping the decomposed half decomposed: U+0415 U+0308 + the new stem. Verified by decoding every quoted string in the file afterwards, and the spec passes (534/534). A repository-wide sweep now finds no occurrence of the replaced titles in either normalization form. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
2026-10-08 17:06:15 -08:00 · 2026-09-21 22:24:14 +02:00
1 parent 11358caa7a
commit eb61d37dc3
@@ -21,10 +21,10 @@ describe('stalker-series.adapters', () => {
        'The Gentlemen season2',
        'The Gentlemen (s02)',
        'The Gentlemen (season 2)',
-        'Олдскул (2 сезон)',
-        'Олдскул (сезон 2)',
-        'Олдскул s02',
-        'Олдскул season2',
+        'Пример (2 сезон)',
+        'Пример (сезон 2)',
+        'Пример s02',
+        'Пример season2',
    ])(
        'uses the title season for lazy VOD %s without changing tracking IDs',
        (title) => {
@@ -9,20 +9,21 @@ import { TmdbSearchResult } from './tmdb.types';
 * Regression coverage for the search wire format. The comparison key folds
 * diacritics — Cyrillic "й" becomes "и" — and that key used to be sent as
 * the TMDB query, which matched nothing for any title carrying "й"/"ё" and
- * cached the miss for a week ("Фейк (10 серий)", "Волшебный участок").
+ * cached the miss for a week. The titles below are illustrative stand-ins
+ * that fold the same way, not the ones the failures were observed on.
 */
 describe('TmdbIdResolverService.resolveBySearch', () => {
-    const fake2026: TmdbSearchResult = {
-        id: 317869,
-        name: 'Фейк',
-        original_name: 'Фейк',
+    const series2026: TmdbSearchResult = {
+        id: 101101,
+        name: 'Лейка',
+        original_name: 'Лейка',
        first_air_date: '2026-07-16',
        vote_count: 3,
    };
-    const fake2024: TmdbSearchResult = {
-        id: 322696,
-        name: 'Фейк',
-        original_name: 'Фейк',
+    const series2024: TmdbSearchResult = {
+        id: 101102,
+        name: 'Лейка',
+        original_name: 'Лейка',
        first_air_date: '2024-12-05',
        vote_count: 0,
    };
@@ -67,7 +68,7 @@ describe('TmdbIdResolverService.resolveBySearch', () => {
    beforeEach(() => {
        searchTv = jest.fn(async (query: string) =>
            // TMDB does not fold Cyrillic: only the provider spelling hits
-            query === 'Фейк' ? [fake2026, fake2024] : []
+            query === 'Лейка' ? [series2026, series2024] : []
        );
        searchMovie = jest.fn().mockResolvedValue([]);
        cacheGet = jest.fn().mockResolvedValue(null);
@@ -78,18 +79,18 @@ describe('TmdbIdResolverService.resolveBySearch', () => {
        const service = createService();

        const id = await service.resolveBySearch('tv', {
-            title: 'Фейк (10 серий)',
+            title: 'Лейка (10 серий)',
            year: 2026,
        });

-        expect(id).toBe(317869);
+        expect(id).toBe(101101);
        expect(searchTv).toHaveBeenCalledTimes(1);
-        expect(searchTv).toHaveBeenCalledWith('Фейк', null, 'ru-RU', 'key');
+        expect(searchTv).toHaveBeenCalledWith('Лейка', null, 'ru-RU', 'key');
        expect(cacheSet).toHaveBeenCalledWith({
            mediaType: 'tv',
-            lookupKey: 'title:фейк|year:2026|v4',
+            lookupKey: 'title:лейка|year:2026|v4',
            language: 'ru-RU',
-            tmdbId: 317869,
+            tmdbId: 101101,
            payload: null,
        });
    });
@@ -99,41 +100,41 @@ describe('TmdbIdResolverService.resolveBySearch', () => {
        const service = createService();

        const id = await service.resolveBySearch('tv', {
-            title: 'Молодой Шерлок',
+            title: 'Пробный Выпуск',
            year: 2026,
        });

        expect(id).toBeNull();
        expect(searchTv).toHaveBeenCalledWith(
-            'Молодой Шерлок',
+            'Пробный Выпуск',
            null,
            'ru-RU',
            'key'
        );
        expect(cacheSet).toHaveBeenCalledWith(
            expect.objectContaining({
-                lookupKey: 'title:молодой шерлок|year:2026|v4',
+                lookupKey: 'title:пробный выпуск|year:2026|v4',
                tmdbId: null,
            })
        );
    });

    it('reads the cache before searching', async () => {
-        cacheGet.mockResolvedValue({ tmdbId: 317869 });
+        cacheGet.mockResolvedValue({ tmdbId: 101101 });
        const service = createService();
        const cacheService = (service as unknown as { cache: TmdbCacheService })
            .cache;
        jest.spyOn(cacheService, 'isFresh').mockReturnValue(true);

        const id = await service.resolveBySearch('tv', {
-            title: 'Фейк (10 серий)',
+            title: 'Лейка (10 серий)',
            year: 2026,
        });

-        expect(id).toBe(317869);
+        expect(id).toBe(101101);
        expect(cacheGet).toHaveBeenCalledWith(
            'tv',
-            'title:фейк|year:2026|v4',
+            'title:лейка|year:2026|v4',
            'ru-RU'
        );
        expect(searchTv).not.toHaveBeenCalled();
@@ -143,31 +144,31 @@ describe('TmdbIdResolverService.resolveBySearch', () => {
        const service = createService();

        const id = await service.resolveBySearch('tv', {
-            title: 'Фейк',
-            originalTitle: 'Феик',
+            title: 'Лейка',
+            originalTitle: 'Леика',
            year: 2026,
        });

-        expect(id).toBe(317869);
+        expect(id).toBe(101101);
        expect(searchTv.mock.calls.map(([query]) => query)).toEqual([
-            'Феик',
-            'Фейк',
+            'Леика',
+            'Лейка',
        ]);
        // Each attempted variant records its own verdict
        expect(
            cacheSet.mock.calls.map(([row]) => [row.lookupKey, row.tmdbId])
        ).toEqual([
-            ['title:феик|year:2026|v4', null],
-            ['title:фейк|year:2026|v4', 317869],
+            ['title:леика|year:2026|v4', null],
+            ['title:лейка|year:2026|v4', 101101],
        ]);
    });

    it("does not let one variant's cached verdict answer for another", async () => {
-        // Item A (original "Феик", display "Феик") cached a miss under
-        // "феик". Item B shares the original title but displays "Фейк":
+        // Item A (original "Леика", display "Леика") cached a miss under
+        // "леика". Item B shares the original title but displays "Лейка":
        // the cached miss must not suppress B's own second variant.
        cacheGet.mockImplementation(async (_type: string, key: string) =>
-            key === 'title:феик|year:2026|v4' ? { tmdbId: null } : null
+            key === 'title:леика|year:2026|v4' ? { tmdbId: null } : null
        );
        const service = createService();
        const cacheService = (service as unknown as { cache: TmdbCacheService })
@@ -177,17 +178,17 @@ describe('TmdbIdResolverService.resolveBySearch', () => {
        );

        const id = await service.resolveBySearch('tv', {
-            title: 'Фейк',
-            originalTitle: 'Феик',
+            title: 'Лейка',
+            originalTitle: 'Леика',
            year: 2026,
        });

-        expect(id).toBe(317869);
+        expect(id).toBe(101101);
        expect(searchTv).toHaveBeenCalledTimes(1);
-        expect(searchTv).toHaveBeenCalledWith('Фейк', null, 'ru-RU', 'key');
+        expect(searchTv).toHaveBeenCalledWith('Лейка', null, 'ru-RU', 'key');
        expect(cacheGet.mock.calls.map(([, key]) => key)).toEqual([
-            'title:феик|year:2026|v4',
-            'title:фейк|year:2026|v4',
+            'title:леика|year:2026|v4',
+            'title:лейка|year:2026|v4',
        ]);
    });

@@ -88,14 +88,14 @@ describe('lookup keys', () => {
    });

    it('keys search rows by the wire spelling, not the folded key', () => {
-        // "Феик" and "Фейк" fold to one comparison key but are different
+        // "Леика" and "Лейка" fold to one comparison key but are different
        // searches with different answers; a verdict cached for one must
        // never be read back for the other.
-        expect(buildSearchLookupKey('Фейк', 2026)).toBe(
-            'title:фейк|year:2026|v4'
+        expect(buildSearchLookupKey('Лейка', 2026)).toBe(
+            'title:лейка|year:2026|v4'
        );
-        expect(buildSearchLookupKey('Феик', 2026)).not.toBe(
-            buildSearchLookupKey('Фейк', 2026)
+        expect(buildSearchLookupKey('Леика', 2026)).not.toBe(
+            buildSearchLookupKey('Лейка', 2026)
        );
        expect(buildSearchLookupKey('THE BOYS', 2019)).toBe(
            buildSearchLookupKey('The Boys', 2019)
@@ -139,8 +139,8 @@ describe('buildSearchTitleVariants', () => {

    it('sends the provider spelling to the search but compares on the folded key', () => {
        // The folded key rewrites "й" as "и"; TMDB finds nothing for it.
-        expect(buildSearchTitleVariants('Фейк (10 серий)', null)).toEqual([
-            { query: 'Фейк', normalized: 'феик' },
+        expect(buildSearchTitleVariants('Лейка (10 серий)', null)).toEqual([
+            { query: 'Лейка', normalized: 'леика' },
        ]);
        // Arabic hamza forms fold into a space inside the word
        expect(buildSearchTitleVariants('إيمان', null)).toEqual([
@@ -160,12 +160,12 @@ describe('buildSearchTitleVariants', () => {
    });

    it('keeps spellings that fold to one key but differ on the wire', () => {
-        // A misspelled original title must not swallow the display title:
-        // TMDB knows "Фейк" and not "Феик", and only the second variant
-        // would find it.
-        expect(buildSearchTitleVariants('Фейк', 'Феик')).toEqual([
-            { query: 'Феик', normalized: 'феик' },
-            { query: 'Фейк', normalized: 'феик' },
+        // A misspelled original title must not swallow the display title.
+        // Take a pair where only the display spelling is the one TMDB
+        // indexes: only the second variant can find it.
+        expect(buildSearchTitleVariants('Лейка', 'Леика')).toEqual([
+            { query: 'Леика', normalized: 'леика' },
+            { query: 'Лейка', normalized: 'леика' },
        ]);
        expect(buildSearchTitleVariants('Amelie', 'Amélie')).toEqual([
            { query: 'Amélie', normalized: 'amelie' },
@@ -40,8 +40,8 @@ function stripLeadingLanguageToken(raw: string): string | null {
 /**
 * One search candidate: what to SEND to TMDB and what to COMPARE its
 * answers against. The two differ on purpose — see `cleanTitleForSearch`:
- * a folded query ("феик") finds nothing on TMDB while the folded key is
- * exactly what the confidence gate and the cache need.
+ * folding rewrites letters TMDB matches on, so the folded form finds nothing
+ * there, while it is exactly what the confidence gate and the cache need.
 */
 export interface SearchTitleVariant {
    /** Provider spelling with tags/brackets/season/year stripped */
@@ -53,7 +53,8 @@ export interface SearchTitleVariant {
 /**
 * The identity of one search on the wire: the query with only the case
 * removed, since TMDB matches case-insensitively and nothing else about
- * the spelling may be folded away — "Феик" and "Фейк" are different
+ * the spelling may be folded away — "Леика" and "Лейка" (illustrative) are
+ * different
 * searches with different answers, however alike their comparison keys.
 * Both the variant deduplication and the cache row use this, so a cached
 * verdict can never be read back for a search that was never sent.
@@ -116,11 +117,11 @@ export function buildSearchLookupKey(
    // v2: normalizeTitleKeys learned to strip appended language/quality
    // tags; the version suffix invalidates cached (incl. negative) match
    // resolutions keyed on the old polluted titles.
-    // v3: the search query stopped being the folded key ("феик" for
-    // "Фейк"), which TMDB answered with nothing; every negative row recorded
-    // under v2 for a title with "й"/"ё" is that bug, not a missing title, and
-    // must not block the retry for its 7-day TTL. Rows are keyed by the
-    // query since then.
+    // v3: the search query stopped being the folded key — the fold rewrites
+    // "й" as "и" ("леика" for "Лейка", to illustrate) and TMDB answers that
+    // spelling with nothing; every negative row recorded under v2 for a title
+    // with "й"/"ё" is that bug, not a missing title, and must not block the
+    // retry for its 7-day TTL. Rows are keyed by the query since then.
    // v4: year evidence is tiered (see `yearEvidenceTier`), so every v3 row
    // resolved by popularity across tiers may name the wrong show — and a
    // positive row stays fresh for 30 days.
@@ -976,9 +976,9 @@ function widenTmdbMetadataMediaTypeCheck(sqliteDb: Database.Database): void {
 * - unversioned → v2: title normalization learned to strip appended
 *   language/quality tags.
 * - v2 → v3: the search query stopped being the folded comparison key. Under
- *   v2 every title with a Cyrillic "й"/"ё" was searched folded ("феик" for
- *   "Фейк", "елки" for "Ёлки"), got no answer, and was cached as missing for
- *   7 days.
+ *   v2 every title with a Cyrillic "й"/"ё" was searched folded — the fold
+ *   spells them "и" and "е", as in the illustrative "леика" for "Лейка" —
+ *   got no answer, and was cached as missing for 7 days.
 * - v3 → v4: year evidence became tiered. Under v3 a series admitted only by
 *   the "premiered earlier" tolerance competed with an exact-year match on
 *   popularity alone, so a new series resolved to its older, better-known
@@ -30,13 +30,13 @@ it('drops only retired search rows across skipped, previous, pre-person, fresh a
        const V3_MARKER = 'migration:tmdb-search-lookup-v3-cache-cleanup:v1';
        const V4_MARKER = 'migration:tmdb-search-lookup-v4-cache-cleanup:v1';
        const ROWS = [
-            ['tv', 'title:феик|year:2026', 'ru-RU', null],
-            ['tv', 'title:феик|year:2026|v2', 'ru-RU', null],
+            ['tv', 'title:леика|year:2026', 'ru-RU', null],
+            ['tv', 'title:леика|year:2026|v2', 'ru-RU', null],
            ['tv', 'title:the boys|year:2019|v2', 'en-US', 76479],
-            ['tv', 'title:фейк|year:2026|v3', 'ru-RU', 317869],
+            ['tv', 'title:лейка|year:2026|v3', 'ru-RU', 101101],
            ['tv', 'title:nightfall|year:2026|v4', 'ru-RU', 424242],
-            ['tv', 'id:317869|v2', 'ru-RU', 317869],
-            ['tv', 'id:317869|season:1', 'ru-RU', 317869],
+            ['tv', 'id:101101|v2', 'ru-RU', 101101],
+            ['tv', 'id:101101|season:1', 'ru-RU', 101101],
            ['person', 'person:287', 'en-US', 287],
            ['movie', 'badProviderId:999', 'any', null],
            ['movie', 'trending:week', 'en-US', null],
@@ -63,7 +63,7 @@ it('drops only retired search rows across skipped, previous, pre-person, fresh a
        hooks.runMigrations(skipped);
        const skippedAfter = snapshot(skipped);
        // Next startup: a row written meanwhile under the current key survives
-        skipped.prepare("INSERT INTO tmdb_metadata (media_type, lookup_key, language, tmdb_id) VALUES ('tv', 'title:гудовы|year:2026|v4', 'ru-RU', 318894)").run();
+        skipped.prepare("INSERT INTO tmdb_metadata (media_type, lookup_key, language, tmdb_id) VALUES ('tv', 'title:сосенка|year:2026|v4', 'ru-RU', 101103)").run();
        hooks.runMigrations(skipped);
        const repeated = snapshot(skipped);
        // Previous release: the earlier cleanups already ran; only v3 rows go
@@ -78,7 +78,7 @@ it('drops only retired search rows across skipped, previous, pre-person, fresh a
        const prePerson = new Database(':memory:');
        hooks.createTables(prePerson);
        prePerson.exec("DROP TABLE tmdb_metadata; CREATE TABLE tmdb_metadata (id INTEGER PRIMARY KEY AUTOINCREMENT, media_type TEXT NOT NULL CHECK (media_type IN ('movie', 'tv')), lookup_key TEXT NOT NULL, language TEXT NOT NULL, tmdb_id INTEGER, payload TEXT, fetched_at TEXT DEFAULT (datetime('now'))); CREATE UNIQUE INDEX tmdb_metadata_lookup_unique ON tmdb_metadata(media_type, lookup_key, language)");
-        prePerson.prepare("INSERT INTO tmdb_metadata (media_type, lookup_key, language, tmdb_id) VALUES ('tv', 'title:феик|year:2026', 'ru-RU', NULL)").run();
+        prePerson.prepare("INSERT INTO tmdb_metadata (media_type, lookup_key, language, tmdb_id) VALUES ('tv', 'title:леика|year:2026', 'ru-RU', NULL)").run();
        hooks.runMigrations(prePerson);
        const prePersonAfter = { ...snapshot(prePerson), check: prePerson.prepare("SELECT sql FROM sqlite_master WHERE name = 'tmdb_metadata'").get().sql.includes("'person'") };
        hooks.runMigrations(prePerson);
@@ -109,13 +109,13 @@ it('drops only retired search rows across skipped, previous, pre-person, fresh a
    const V4_MARKER = 'migration:tmdb-search-lookup-v4-cache-cleanup:v1';
    const survivors = [
        'badProviderId:999',
-        'id:317869|season:1',
-        'id:317869|v2',
+        'id:101101|season:1',
+        'id:101101|v2',
        'person:287',
        'title:nightfall|year:2026|v4',
        'trending:week',
    ];
-    const detailsPayloads = ['{"id":317869}', '{"id":317869}'];
+    const detailsPayloads = ['{"id":101101}', '{"id":101101}'];

    expect(JSON.parse(result)).toEqual({
        skippedAfter: {
@@ -124,7 +124,7 @@ it('drops only retired search rows across skipped, previous, pre-person, fresh a
            markers: [V2_MARKER, V3_MARKER, V4_MARKER],
        },
        repeated: {
-            keys: [...survivors, 'title:гудовы|year:2026|v4'].sort(),
+            keys: [...survivors, 'title:сосенка|year:2026|v4'].sort(),
            payloads: detailsPayloads,
            markers: [V2_MARKER, V3_MARKER, V4_MARKER],
        },
@@ -132,8 +132,8 @@ it('drops only retired search rows across skipped, previous, pre-person, fresh a
            // The older generations' rows are their business, already done
            keys: [
                ...survivors,
-                'title:феик|year:2026',
-                'title:феик|year:2026|v2',
+                'title:леика|year:2026',
+                'title:леика|year:2026|v2',
                'title:the boys|year:2019|v2',
            ].sort(),
            payloads: detailsPayloads,
@@ -142,8 +142,8 @@ it('drops only retired search rows across skipped, previous, pre-person, fresh a
        previousRepeated: {
            keys: [
                ...survivors,
-                'title:феик|year:2026',
-                'title:феик|year:2026|v2',
+                'title:леика|year:2026',
+                'title:леика|year:2026|v2',
                'title:the boys|year:2019|v2',
            ].sort(),
            payloads: detailsPayloads,
@@ -13,7 +13,7 @@ describe('foldSearchText', () => {
        ['Ünlü Şef', 'ünlü şef'],
        ['ÇANAKKALE', 'çanakkale'],
        ['Первый канал HD', 'первый канал hd'],
-        ['Ёлки', 'ёлки'],
+        ['Ёжик', 'ёжик'],
        ['Йога для всех', 'йога для всех'],
        ['Ελλάδα Σήμερα', 'ελλάδα σήμερα'],
        ['Amélie', 'amélie'],
@@ -28,7 +28,7 @@ describe('foldSearchText', () => {
    it.each([
        ['Amélie', 'Amélie'],
        ['İnşaat', 'İnşaat'],
-        ['Ёлки', 'Ёлки'],
+        ['Ёжик', 'Ёжик'],
        ['Йога', 'Йога'],
        ['Ünlü', 'Ünlü'],
        ['Ά', 'Ά'],
@@ -434,22 +434,23 @@ describe('titleYearsCompatible', () => {
 describe('cleanTitleForSearch', () => {
    it('keeps Cyrillic letters that folding would rewrite', () => {
        // NFD splits "й" into "и" + a breve and "ё" into "е" + a diaeresis;
-        // the comparison key drops both marks, and TMDB answers the folded
-        // spelling with nothing (issue: "Фейк (10 серий)" never matched).
-        expect(normalizeTitle('Фейк (10 серий)')).toBe('феик');
-        expect(cleanTitleForSearch('Фейк (10 серий)')).toBe('Фейк');
-        expect(cleanTitleForSearch('Ёлки 2010')).toBe('Ёлки');
-        expect(cleanTitleForSearch('Волшебный участок s02')).toBe(
-            'Волшебный участок'
+        // the comparison key drops both marks, and TMDB answers that folded
+        // spelling with nothing. The titles here are illustrative stand-ins
+        // chosen to fold the same way.
+        expect(normalizeTitle('Лейка (10 серий)')).toBe('леика');
+        expect(cleanTitleForSearch('Лейка (10 серий)')).toBe('Лейка');
+        expect(cleanTitleForSearch('Ёжик 2010')).toBe('Ёжик');
+        expect(cleanTitleForSearch('Тестовый Сериал s02')).toBe(
+            'Тестовый Сериал'
        );
    });

    it('keeps Arabic hamza forms that folding splits into two words', () => {
        // "أ" decomposes into a bare alef + U+0654, which is outside the
-        // stripped mark range and so becomes a SPACE in the key. TMDB finds
-        // "أطرق بابي" and nothing for "ا طرق بابي".
-        expect(normalizeTitle('AR| أطرق بابي')).toBe('ا طرق بابي');
-        expect(cleanTitleForSearch('AR| أطرق بابي')).toBe('أطرق بابي');
+        // stripped mark range and so becomes a SPACE in the key — splitting
+        // the word in two, which is not a spelling TMDB indexes.
+        expect(normalizeTitle('AR| أمثلة تجريبية')).toBe('ا مثلة تجريبية');
+        expect(cleanTitleForSearch('AR| أمثلة تجريبية')).toBe('أمثلة تجريبية');
    });

    it('keeps Latin diacritics and casing', () => {
@@ -490,9 +491,9 @@ describe('cleanTitleForSearch', () => {

    it('normalizes to the same key as the text it was derived from', () => {
        for (const raw of [
-            'Фейк (10 серий)',
+            'Лейка (10 серий)',
            'EN - The Matrix (1999) 4K',
-            'Ёлки 2010',
+            'Ёжик 2010',
            'Amélie (2001)',
            '|FR|VO|Le dernier empereur',
        ]) {
@@ -443,7 +443,7 @@ const SEASON_SUFFIX_PATTERN = new RegExp(
 * every comparison key and OFF for the text sent to a remote search — see
 * `cleanTitleForSearch`. Folding is lossy for scripts whose "diacritics" are
 * distinct letters: NFD turns Cyrillic "й" into "и" + a combining breve, and
- * dropping the breve rewrites "Фейк" as "феик", "ё" as "е". Two provider
+ * dropping the breve rewrites "Лейка" as "леика", "ё" as "е". Two provider
 * copies of a title still meet on that key, which is all a comparison needs,
 * but TMDB's search does not fold Cyrillic the same way and answers a folded
 * query with nothing at all.
@@ -520,7 +520,8 @@ export function normalizeTitleKeys(
 *
 * Comparison keys must fold so two spellings of one film meet; a search
 * query must not, because the search engine folds by its own rules and a
- * pre-folded Cyrillic query ("феик" for "Фейк") matches nothing there.
+ * pre-folded Cyrillic query matches nothing there ("леика" for "Лейка"
+ * illustrates the rewrite).
 * Compare the results with `normalizeTitle`, never with this.
 */
 export function cleanTitleForSearch(raw: string | null | undefined): string {