perf(backend): add dedicated screenerTtl config for screener caching

- Add CACHE_SCREENER_TTL env var (default 900s) to configuration
- Move screener from marketDataTtl to dedicated screenerTtl
- Add test verifying cache key prefix, parts, and TTL config key
- 117 tests pass, build succeeds

apps/backend/src/config/configuration.ts

@@ -29,6 +29,7 @@ export default registerAs('app', () => ({
     candlesTtl: parseInt(process.env.CACHE_CANDLES_TTL || '3600', 10),
     securityTtl: parseInt(process.env.CACHE_SECURITY_TTL || '86400', 10),
     searchTtl: parseInt(process.env.CACHE_SEARCH_TTL || '3600', 10),
+    screenerTtl: parseInt(process.env.CACHE_SCREENER_TTL || '900', 10),
     dividendsTtl: parseInt(process.env.CACHE_DIVIDENDS_TTL || '86400', 10),
     tbankAccountsTtl: parseInt(process.env.CACHE_TBANK_ACCOUNTS_TTL || '3600', 10),
     tbankPortfolioTtl: parseInt(process.env.CACHE_TBANK_PORTFOLIO_TTL || '60', 10),

apps/backend/src/modules/securities/screener.service.spec.ts

@@ -7,24 +7,15 @@ import { ScreenerType } from './dto/screener-query.dto';
 describe('ScreenerService', () => {
   let service: ScreenerService;
   let cache: CacheService;
+  const moexClient = { getShareMarketDataBatch: vi.fn(), getBondPositionDataBatch: vi.fn() };
 
   beforeEach(async () => {
+    vi.clearAllMocks();
     const module: TestingModule = await Test.createTestingModule({
       providers: [
         ScreenerService,
-        {
+        { provide: MoexClientService, useValue: moexClient },
-          provide: MoexClientService,
+        { provide: CacheService, useValue: { getOrFetch: vi.fn() } },
-          useValue: {
-            getShareMarketDataBatch: vi.fn(),
-            getBondPositionDataBatch: vi.fn(),
-          },
-        },
-        {
-          provide: CacheService,
-          useValue: {
-            getOrFetch: vi.fn(),
-          },
-        },
       ],
     }).compile();
 
@@ -37,6 +28,30 @@ describe('ScreenerService', () => {
   });
 
   describe('screen', () => {
+    it('should cache full dataset with screenerTtl config', async () => {
+      const mockShares = [{
+        secid: 'SBER', shortName: 'Sberbank', last: 250, volume: 1000000,
+        lastChange: 5, lastChangePrcnt: 2, issueCapitalization: 1e9,
+      }];
+
+      moexClient.getShareMarketDataBatch.mockResolvedValue(mockShares);
+
+      vi.mocked(cache.getOrFetch).mockImplementation(async (_prefix, _keys, fetchFn) => ({
+        data: await fetchFn(),
+        fromCache: false,
+        cachedAt: null,
+      }));
+
+      await service.screen({ type: ScreenerType.SHARE });
+
+      expect(cache.getOrFetch).toHaveBeenCalledWith(
+        'screener',
+        [ScreenerType.SHARE],
+        expect.any(Function),
+        'screenerTtl',
+      );
+    });
+
     it('should filter and sort shares', async () => {
       const mockShares = [
         {

apps/backend/src/modules/securities/screener.service.ts

@@ -85,7 +85,7 @@ export class ScreenerService {
           );
         }
       },
-      'marketDataTtl',
+      'screenerTtl',
     );
 
     return data;