fix(import): unify account and currency duplicate matching

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Activity imports now detect identical rows within the same payload. Identical broker partial fills in the same second can also be flagged as duplicates.
 - Moved the investment chart component to `@ghostfolio/ui`
 - Hardened the validation of the date in the endpoint to create an account balance
 - Upgraded `bootstrap` from version `4.6.2` to `5.3.8`
@@ -20,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Scoped import duplicate detection to the same account, including unassigned activities, and aligned currency matching for saved and incoming activities
 - Fixed an exception in the authentication interceptor when the time zone of the browser is not available
 
 ## 3.86.0 - 2026-10-13

apps/api/src/app/import/import.service.spec.ts

@@ -33,6 +33,8 @@ describe('ImportService', () => {
   let addSymbolProfile: jest.Mock;
   let createActivity: jest.Mock;
   let gatherSymbols: jest.Mock;
+  let getAccounts: jest.Mock;
+  let getActivities: jest.Mock;
   let importService: ImportService;
   let updateManyMarketData: jest.Mock;
 
@@ -46,6 +48,8 @@ describe('ImportService', () => {
     addSymbolProfile = jest.fn();
     createActivity = jest.fn();
     gatherSymbols = jest.fn();
+    getAccounts = jest.fn().mockResolvedValue([]);
+    getActivities = jest.fn().mockResolvedValue({ activities: [], count: 0 });
     updateManyMarketData = jest.fn();
 
     const validateActivities = jest.fn(
@@ -56,7 +60,7 @@ describe('ImportService', () => {
 
         for (const { currency, dataSource, symbol } of activitiesDto) {
           assetProfiles[getAssetProfileIdentifier({ dataSource, symbol })] ??= {
-            currency,
+            currency: currency ?? 'USD',
             dataSource,
             symbol,
             name: symbol
@@ -69,11 +73,11 @@ describe('ImportService', () => {
 
     importService = new ImportService(
       {
-        accounts: jest.fn().mockResolvedValue([])
+        accounts: getAccounts
       } as unknown as AccountService,
       {
         createActivity,
-        getActivities: jest.fn().mockResolvedValue({ activities: [], count: 0 })
+        getActivities
       } as unknown as ActivitiesService,
       null,
       {
@@ -533,6 +537,10 @@ describe('ImportService', () => {
     });
 
     it('does not flag identical activities across different accounts as duplicates', async () => {
+      getAccounts.mockResolvedValue([
+        { id: 'account-1', name: 'First account' },
+        { id: 'account-2', name: 'Second account' }
+      ]);
       const activities = await importActivities({
         activitiesDto: [
           {
@@ -560,6 +568,156 @@ describe('ImportService', () => {
       expect(activities[0].error).toBeUndefined();
       expect(activities[1].error).toBeUndefined();
     });
+
+    it.each([
+      { accountId: 'account-1', isDuplicate: true },
+      { accountId: 'account-2', isDuplicate: false },
+      { accountId: undefined, isDuplicate: false }
+    ])(
+      'checks saved activities against account $accountId',
+      async ({ accountId, isDuplicate }) => {
+        getAccounts.mockResolvedValue([
+          { id: 'account-1', name: 'First account' },
+          { id: 'account-2', name: 'Second account' }
+        ]);
+        const dto = createActivityDto({
+          dataSource: DataSource.YAHOO,
+          date: '2024-01-01T00:00:00.000Z',
+          symbol: 'AAPL',
+          type: 'BUY'
+        });
+        getActivities.mockResolvedValue({
+          count: 1,
+          activities: [
+            {
+              ...dto,
+              accountId: 'account-1',
+              currency: null,
+              date: parseISO(dto.date),
+              assetProfile: {
+                currency: 'USD',
+                dataSource: dto.dataSource,
+                symbol: dto.symbol
+              }
+            }
+          ]
+        });
+
+        const activities = await importActivities({
+          activitiesDto: [{ ...dto, accountId }],
+          isDryRun: true
+        });
+
+        expect(activities[0].error).toEqual(
+          isDuplicate ? { code: 'IS_DUPLICATE' } : undefined
+        );
+        expect(createActivity).not.toHaveBeenCalled();
+      }
+    );
+
+    it.each([
+      [undefined, 'account-1'],
+      ['account-1', undefined]
+    ])(
+      'keeps assigned and unassigned rows distinct in either order (%s, %s)',
+      async (firstAccountId, secondAccountId) => {
+        getAccounts.mockResolvedValue([
+          { id: 'account-1', name: 'First account' }
+        ]);
+        const dto = createActivityDto({
+          dataSource: DataSource.YAHOO,
+          date: '2024-01-01T00:00:00.000Z',
+          symbol: 'AAPL',
+          type: 'BUY'
+        });
+
+        const activities = await importActivities({
+          activitiesDto: [
+            { ...dto, accountId: firstAccountId },
+            { ...dto, accountId: secondAccountId }
+          ],
+          isDryRun: true
+        });
+
+        expect(activities.map(({ error }) => error)).toEqual([
+          undefined,
+          undefined
+        ]);
+      }
+    );
+
+    it('treats null and omitted accounts as the same unassigned account', async () => {
+      const dto = createActivityDto({
+        dataSource: DataSource.YAHOO,
+        date: '2024-01-01T00:00:00.000Z',
+        symbol: 'AAPL',
+        type: 'BUY'
+      });
+      const activities = await importActivities({
+        activitiesDto: [{ ...dto, accountId: null }, dto],
+        isDryRun: true
+      });
+
+      expect(activities[0].error).toBeUndefined();
+      expect(activities[1].error).toEqual({ code: 'IS_DUPLICATE' });
+    });
+
+    it.each([
+      [undefined, 'USD'],
+      ['USD', undefined]
+    ])(
+      'uses the asset currency consistently within a batch (%s, %s)',
+      async (firstCurrency, secondCurrency) => {
+        const dto = createActivityDto({
+          dataSource: DataSource.YAHOO,
+          date: '2024-01-01T00:00:00.000Z',
+          symbol: 'AAPL',
+          type: 'BUY'
+        });
+        const activities = await importActivities({
+          activitiesDto: [
+            { ...dto, currency: firstCurrency },
+            { ...dto, currency: secondCurrency }
+          ],
+          isDryRun: true
+        });
+
+        expect(activities[0].error).toBeUndefined();
+        expect(activities[1].error).toEqual({ code: 'IS_DUPLICATE' });
+      }
+    );
+
+    it('does not replace an explicit saved transaction currency with the asset currency', async () => {
+      const dto = createActivityDto({
+        dataSource: DataSource.YAHOO,
+        date: '2024-01-01T00:00:00.000Z',
+        symbol: 'AAPL',
+        type: 'BUY'
+      });
+      getActivities.mockResolvedValue({
+        count: 1,
+        activities: [
+          {
+            ...dto,
+            accountId: null,
+            currency: 'EUR',
+            date: parseISO(dto.date),
+            assetProfile: {
+              currency: 'USD',
+              dataSource: dto.dataSource,
+              symbol: dto.symbol
+            }
+          }
+        ]
+      });
+
+      const activities = await importActivities({
+        activitiesDto: [dto],
+        isDryRun: true
+      });
+
+      expect(activities[0].error).toBeUndefined();
+    });
   });
 
   function importActivities({

apps/api/src/app/import/import.service.ts

@@ -45,7 +45,7 @@ import {
 } from '@ghostfolio/common/types';
 
 import { Injectable } from '@nestjs/common';
-import { Account, DataSource, Prisma } from '@prisma/client';
+import { Account, DataSource, Prisma, SymbolProfile } from '@prisma/client';
 import { Big } from 'big.js';
 import { isISIN } from 'class-validator';
 import { isSameSecond, parseISO, subDays } from 'date-fns';
@@ -766,6 +766,7 @@ export class ImportService {
 
     const activitiesExtendedWithErrors = await this.extendActivitiesWithErrors({
       activitiesDto,
+      assetProfiles,
       userCurrency,
       userId: user.id
     });
@@ -1034,10 +1035,14 @@ export class ImportService {
 
   private async extendActivitiesWithErrors({
     activitiesDto,
+    assetProfiles,
     userCurrency,
     userId
   }: {
     activitiesDto: Partial<CreateOrderDto>[];
+    assetProfiles: {
+      [assetProfileIdentifier: string]: Partial<SymbolProfile>;
+    };
     userCurrency: string;
     userId: string;
   }): Promise<(Partial<Activity> & Pick<Activity, 'assetProfile'>)[]> {
@@ -1067,28 +1072,18 @@ export class ImportService {
         unitPrice
       }) => {
         const date = parseISO(dateString);
+        const assetCurrency =
+          assetProfiles[getAssetProfileIdentifier({ dataSource, symbol })]
+            ?.currency;
 
-        const isDuplicate =
-          existingActivities.some((activity) => {
-            return (
-              (!accountId || activity.accountId === accountId) &&
-              (activity.comment || null) === (comment || null) &&
-              ((activity.currency || null) === (currency || null) ||
-                activity.assetProfile.currency === currency) &&
-              activity.assetProfile.dataSource === dataSource &&
-              isSameSecond(activity.date, date) &&
-              activity.fee === fee &&
-              activity.quantity === quantity &&
-              activity.assetProfile.symbol === symbol &&
-              activity.type === type &&
-              activity.unitPrice === unitPrice
-            );
-          }) ||
-          processedActivities.some((activity) => {
+        const isMatchingActivity = (
+          activity: Partial<Activity> & Pick<Activity, 'assetProfile'>
+        ) => {
           return (
-              (!accountId || activity.accountId === accountId) &&
+            (activity.accountId || null) === (accountId || null) &&
             (activity.comment || null) === (comment || null) &&
-              (activity.currency || null) === (currency || null) &&
+            (activity.currency ?? activity.assetProfile.currency ?? null) ===
+              (currency ?? assetCurrency ?? null) &&
             activity.assetProfile.dataSource === dataSource &&
             isSameSecond(activity.date, date) &&
             activity.fee === fee &&
@@ -1097,7 +1092,10 @@ export class ImportService {
             activity.type === type &&
             activity.unitPrice === unitPrice
           );
-          });
+        };
+        const isDuplicate =
+          existingActivities.some(isMatchingActivity) ||
+          processedActivities.some(isMatchingActivity);
 
         const error: ActivityError = isDuplicate
           ? { code: 'IS_DUPLICATE' }
@@ -1121,7 +1119,7 @@ export class ImportService {
             assetSubClass: undefined,
             countries: undefined,
             createdAt: undefined,
-            currency: undefined,
+            currency: assetCurrency,
             holdings: undefined,
             id: undefined,
             isActive: true,