refactor: check persisted json payload shape instead of double casts (#152) (#154)

src/modules/investments/tbank-sync/tbank-sync.repository.spec.ts

@@ -0,0 +1,14 @@
+jest.mock('../../../prisma/prisma.service', () => ({
+  PrismaService: class {},
+}));
+
+import { screenIntent } from './tbank-sync.repository';
+
+describe('screen sync intent', () => {
+  it('restores a persisted intent and rejects a corrupted one', () => {
+    const intent = { now: '2026-11-02T00:00:00.000Z', scope: { screen: 'accounts' } };
+    expect(screenIntent(intent)).toEqual(intent);
+    expect(() => screenIntent({ source: 'hourly' })).toThrow('Corrupted screen sync intent');
+    expect(() => screenIntent(null)).toThrow('Corrupted screen sync intent');
+  });
+});

src/modules/investments/tbank-sync/tbank-sync.repository.ts

@@ -8,6 +8,15 @@ import type { InvestmentScreenDto } from './tbank-sync.dto';
 
 import { PrismaService } from '../../../prisma/prisma.service';
 export type ScreenIntent = { now: string; scope: InvestmentScreenDto };
+
+// Json columns are written only by this repository; a shape check turns corruption into an explicit 500.
+export function screenIntent(value: Prisma.JsonValue): ScreenIntent {
+  const intent = value as null | Partial<ScreenIntent>;
+  if (typeof intent?.now !== 'string' || typeof intent.scope?.screen !== 'string') {
+    throw new Error('Corrupted screen sync intent');
+  }
+  return intent as ScreenIntent;
+}
 export type ScreenProgress = {
   attempts?: Record<string, string>;
   children: string[];
@@ -226,10 +235,8 @@ export class TbankSyncRepository {
         processRunId: runId,
         state: 'running',
         priority: 0,
-        intent: JSON.parse(
-          JSON.stringify({ source: 'hourly' }),
-        ) as Prisma.InputJsonObject,
-        progress: { sections: [] } as unknown as Prisma.InputJsonValue,
+        intent: { source: 'hourly' },
+        progress: { sections: [] },
         errorCode: null,
       };
       const work = await tx.tbankSyncWork.upsert({

src/modules/investments/tbank-sync/tbank-sync.service.ts

@@ -8,10 +8,7 @@ import { randomUUID } from 'node:crypto';
 import { TbankAccessService } from '../../../integrations/tbank/tbank.api';
 import { BrokerageOperationsSyncService } from '../operations/operations.api';
 import { TbankSyncStatusDto } from './tbank-sync.dto';
-import {
-  type ScreenIntent,
-  TbankSyncRepository,
-} from './tbank-sync.repository';
+import { screenIntent, TbankSyncRepository } from './tbank-sync.repository';
 
 @Injectable()
 export class TbankSyncService {
@@ -35,7 +32,7 @@ export class TbankSyncService {
     if (!saved.work.scopeKey.startsWith('screen:')) {
       return this.sourceStatus(userId, saved.work);
     }
-    const intent = saved.work.intent as unknown as ScreenIntent;
+    const intent = screenIntent(saved.work.intent);
     await this.access.local(userId, intent.scope.accountId);
     const children = await Promise.all(
       saved.children.map((child) =>