fix: prevent background Laya rebuilds during playback

Ensure automatic live projection rebuilds use the algorithmic path so Laya identity batches are not launched during live list playback or background sync.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/t35LayaPerfRegression.test.js

@@ -0,0 +1,157 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const Database = require('better-sqlite3');
+const {
+    ensureColumns,
+    LIVE_PROJECTION_COLUMNS,
+    LIVE_PROJECTION_SCHEMA_SQL
+} = require('../server/db/liveProjectionSchema');
+const appDb = require('../server/db');
+const layaModule = require('../server/services/layaService');
+const liveProjection = require('../server/services/liveProjectionService');
+
+const liveRouteSource = fs.readFileSync(path.join(__dirname, '..', 'server', 'routes', 'live.js'), 'utf8');
+
+function createDb() {
+    const db = new Database(':memory:');
+    db.exec(`
+        CREATE TABLE categories (
+            id TEXT PRIMARY KEY,
+            source_id INTEGER NOT NULL,
+            category_id TEXT NOT NULL,
+            type TEXT NOT NULL,
+            name TEXT NOT NULL,
+            parent_id TEXT,
+            is_hidden INTEGER DEFAULT 0,
+            data JSON
+        );
+        CREATE TABLE playlist_items (
+            id TEXT PRIMARY KEY,
+            source_id INTEGER NOT NULL,
+            item_id TEXT NOT NULL,
+            type TEXT NOT NULL,
+            name TEXT NOT NULL,
+            category_id TEXT,
+            parent_id TEXT,
+            stream_icon TEXT,
+            stream_url TEXT,
+            container_extension TEXT,
+            rating REAL,
+            year TEXT,
+            added_at TEXT,
+            is_hidden INTEGER DEFAULT 0,
+            is_favorite INTEGER DEFAULT 0,
+            data JSON
+        );
+        CREATE TABLE favorites (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            source_id INTEGER NOT NULL,
+            item_id TEXT NOT NULL,
+            item_type TEXT NOT NULL
+        );
+    `);
+    ensureColumns(db, 'playlist_items', LIVE_PROJECTION_COLUMNS);
+    db.exec(LIVE_PROJECTION_SCHEMA_SQL);
+    return db;
+}
+
+function seedChannel(db, sourceId, itemId, name) {
+    db.prepare(`
+        INSERT INTO playlist_items
+            (id, source_id, item_id, type, name, category_id, stream_icon, stream_url, data)
+        VALUES (?, ?, ?, 'live', ?, 'sports', '', ?, '{}')
+    `).run(`${sourceId}:${itemId}`, sourceId, itemId, name, `https://streams.test/${itemId}.m3u8`);
+}
+
+async function simulateLiveListOpen(database) {
+    let state = liveProjection.projectionState(database);
+    if (state.status !== 'success' && state.status !== 'building') {
+        state = await liveProjection.startRebuild(database, {
+            mode: 'algo',
+            schedule: callback => callback()
+        }).promise;
+    }
+    return liveProjection.getChannelPage({ includeHidden: false, userId: 7 }, database, {
+        iptvOrgCatalog: { findMatch: () => null },
+        epgMatching: { findBestMatch: () => null }
+    });
+}
+
+test('opening the live list with a missing projection must not start a global Laya identity batch', async () => {
+    assert.match(
+        liveRouteSource,
+        /liveProjection\.startRebuild\(null, \{ mode: 'algo' \}\)/,
+        'the live-list repair path must explicitly request the algorithmic rebuild mode'
+    );
+    const db = createDb();
+    for (let index = 0; index < 12; index++) {
+        seedChannel(db, 1, `existing-${index}`, `beIN Sports 1 regional ${index}`);
+    }
+
+    let layaCalls = 0;
+    let layaPairCount = 0;
+    const originalSettingsGet = appDb.settings.get;
+    const OriginalLayaService = layaModule.LayaService;
+    appDb.settings.get = async () => ({ ...appDb.getDefaultSettings(), languageDetectionMode: 'laya' });
+    layaModule.LayaService = class {
+        async identityHintBatch(pairs) {
+            layaCalls += 1;
+            layaPairCount += pairs.length;
+            return pairs.map(pair => ({
+                id: pair.id,
+                sameIdentityProbability: 0.9,
+                confidence: 0.9,
+                family: 'bein sports',
+                number: '1'
+            }));
+        }
+    };
+
+    try {
+        const page = await simulateLiveListOpen(db);
+        assert.ok(page.channels.length > 0);
+        assert.equal(layaCalls, 0, `unexpected Laya identity batches while opening live list; batches=${layaCalls}, pairs=${layaPairCount}`);
+    } finally {
+        appDb.settings.get = originalSettingsGet;
+        layaModule.LayaService = OriginalLayaService;
+        db.close();
+    }
+});
+
+test('background live sync rebuilds must not start Laya identity batches in configured Laya mode', async () => {
+    const db = createDb();
+    for (let index = 0; index < 12; index++) {
+        seedChannel(db, 1, `existing-${index}`, `beIN Sports 1 regional ${index}`);
+    }
+
+    let layaCalls = 0;
+    let layaPairCount = 0;
+    const originalSettingsGet = appDb.settings.get;
+    const OriginalLayaService = layaModule.LayaService;
+    appDb.settings.get = async () => ({ ...appDb.getDefaultSettings(), languageDetectionMode: 'laya' });
+    layaModule.LayaService = class {
+        async identityHintBatch(pairs) {
+            layaCalls += 1;
+            layaPairCount += pairs.length;
+            return pairs.map(pair => ({
+                id: pair.id,
+                sameIdentityProbability: 0.9,
+                confidence: 0.9,
+                family: 'bein sports',
+                number: '1'
+            }));
+        }
+    };
+
+    try {
+        await liveProjection.queueRebuild(db);
+        assert.equal(layaCalls, 0, `unexpected Laya identity batches during background sync rebuild; batches=${layaCalls}, pairs=${layaPairCount}`);
+    } finally {
+        appDb.settings.get = originalSettingsGet;
+        layaModule.LayaService = OriginalLayaService;
+        db.close();
+    }
+});