diff --git a/apps/api/src/app/portfolio/calculator/mwr/portfolio-calculator.ts b/apps/api/src/app/portfolio/calculator/mwr/portfolio-calculator.ts
index 978f1f3aa..a90f32c98 100644
--- a/apps/api/src/app/portfolio/calculator/mwr/portfolio-calculator.ts
+++ b/apps/api/src/app/portfolio/calculator/mwr/portfolio-calculator.ts
@@ -1,10 +1,7 @@
 import { PortfolioCalculator } from '@ghostfolio/api/app/portfolio/calculator/portfolio-calculator';
 import { PortfolioSnapshot } from '@ghostfolio/api/app/portfolio/interfaces/portfolio-snapshot.interface';
-import {
-  SymbolMetrics,
-  TimelinePosition,
-  UniqueAsset
-} from '@ghostfolio/common/interfaces';
+import { SymbolMetrics, UniqueAsset } from '@ghostfolio/common/interfaces';
+import { TimelinePosition } from '@ghostfolio/common/models';
 
 export class MWRPortfolioCalculator extends PortfolioCalculator {
   protected calculateOverallPerformance(
diff --git a/apps/api/src/app/portfolio/calculator/twr/portfolio-calculator.ts b/apps/api/src/app/portfolio/calculator/twr/portfolio-calculator.ts
index 9458fb1bd..62d36aebb 100644
--- a/apps/api/src/app/portfolio/calculator/twr/portfolio-calculator.ts
+++ b/apps/api/src/app/portfolio/calculator/twr/portfolio-calculator.ts
@@ -3,11 +3,8 @@ import { PortfolioOrderItem } from '@ghostfolio/api/app/portfolio/interfaces/por
 import { PortfolioSnapshot } from '@ghostfolio/api/app/portfolio/interfaces/portfolio-snapshot.interface';
 import { getFactor } from '@ghostfolio/api/helper/portfolio.helper';
 import { DATE_FORMAT } from '@ghostfolio/common/helper';
-import {
-  SymbolMetrics,
-  TimelinePosition,
-  UniqueAsset
-} from '@ghostfolio/common/interfaces';
+import { SymbolMetrics, UniqueAsset } from '@ghostfolio/common/interfaces';
+import { TimelinePosition } from '@ghostfolio/common/models';
 
 import { Logger } from '@nestjs/common';
 import { Big } from 'big.js';
diff --git a/apps/api/src/app/portfolio/interfaces/portfolio-snapshot.interface.ts b/apps/api/src/app/portfolio/interfaces/portfolio-snapshot.interface.ts
index d89734987..f8bba2113 100644
--- a/apps/api/src/app/portfolio/interfaces/portfolio-snapshot.interface.ts
+++ b/apps/api/src/app/portfolio/interfaces/portfolio-snapshot.interface.ts
@@ -1,4 +1,5 @@
-import { ResponseError, TimelinePosition } from '@ghostfolio/common/interfaces';
+import { ResponseError } from '@ghostfolio/common/interfaces';
+import { TimelinePosition } from '@ghostfolio/common/models';
 
 import { Big } from 'big.js';
 
diff --git a/apps/api/src/app/portfolio/portfolio.service.ts b/apps/api/src/app/portfolio/portfolio.service.ts
index 4e56f844b..a724e5d98 100644
--- a/apps/api/src/app/portfolio/portfolio.service.ts
+++ b/apps/api/src/app/portfolio/portfolio.service.ts
@@ -29,6 +29,7 @@ import {
   EnhancedSymbolProfile,
   Filter,
   HistoricalDataItem,
+  InvestmentItem,
   PortfolioDetails,
   PortfolioInvestments,
   PortfolioPerformanceResponse,
@@ -36,10 +37,9 @@ import {
   PortfolioReport,
   PortfolioSummary,
   Position,
-  TimelinePosition,
   UserSettings
 } from '@ghostfolio/common/interfaces';
-import { InvestmentItem } from '@ghostfolio/common/interfaces/investment-item.interface';
+import { TimelinePosition } from '@ghostfolio/common/models';
 import type {
   AccountWithValue,
   DateRange,
diff --git a/apps/api/src/models/rule.ts b/apps/api/src/models/rule.ts
index ba37f4e94..8397f3e46 100644
--- a/apps/api/src/models/rule.ts
+++ b/apps/api/src/models/rule.ts
@@ -1,7 +1,8 @@
 import { RuleSettings } from '@ghostfolio/api/models/interfaces/rule-settings.interface';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
 import { groupBy } from '@ghostfolio/common/helper';
-import { TimelinePosition, UserSettings } from '@ghostfolio/common/interfaces';
+import { UserSettings } from '@ghostfolio/common/interfaces';
+import { TimelinePosition } from '@ghostfolio/common/models';
 
 import { EvaluationResult } from './interfaces/evaluation-result.interface';
 import { RuleInterface } from './interfaces/rule.interface';
diff --git a/apps/api/src/models/rules/currency-cluster-risk/base-currency-current-investment.ts b/apps/api/src/models/rules/currency-cluster-risk/base-currency-current-investment.ts
index 39406e6c2..372250dbc 100644
--- a/apps/api/src/models/rules/currency-cluster-risk/base-currency-current-investment.ts
+++ b/apps/api/src/models/rules/currency-cluster-risk/base-currency-current-investment.ts
@@ -1,7 +1,8 @@
 import { RuleSettings } from '@ghostfolio/api/models/interfaces/rule-settings.interface';
 import { Rule } from '@ghostfolio/api/models/rule';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
-import { TimelinePosition, UserSettings } from '@ghostfolio/common/interfaces';
+import { UserSettings } from '@ghostfolio/common/interfaces';
+import { TimelinePosition } from '@ghostfolio/common/models';
 
 export class CurrencyClusterRiskBaseCurrencyCurrentInvestment extends Rule<Settings> {
   private positions: TimelinePosition[];
diff --git a/apps/api/src/models/rules/currency-cluster-risk/current-investment.ts b/apps/api/src/models/rules/currency-cluster-risk/current-investment.ts
index 078aaba9b..8ebb24ac0 100644
--- a/apps/api/src/models/rules/currency-cluster-risk/current-investment.ts
+++ b/apps/api/src/models/rules/currency-cluster-risk/current-investment.ts
@@ -1,7 +1,8 @@
 import { RuleSettings } from '@ghostfolio/api/models/interfaces/rule-settings.interface';
 import { Rule } from '@ghostfolio/api/models/rule';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
-import { TimelinePosition, UserSettings } from '@ghostfolio/common/interfaces';
+import { UserSettings } from '@ghostfolio/common/interfaces';
+import { TimelinePosition } from '@ghostfolio/common/models';
 
 export class CurrencyClusterRiskCurrentInvestment extends Rule<Settings> {
   private positions: TimelinePosition[];
diff --git a/libs/common/src/lib/class-transformer.ts b/libs/common/src/lib/class-transformer.ts
new file mode 100644
index 000000000..bd9db22da
--- /dev/null
+++ b/libs/common/src/lib/class-transformer.ts
@@ -0,0 +1,9 @@
+import { Big } from 'big.js';
+
+export function transformToBig({ value }: { value: string }): Big {
+  if (value === null) {
+    return null;
+  }
+
+  return new Big(value);
+}
diff --git a/libs/common/src/lib/interfaces/index.ts b/libs/common/src/lib/interfaces/index.ts
index dba1ac79a..c2c9ce619 100644
--- a/libs/common/src/lib/interfaces/index.ts
+++ b/libs/common/src/lib/interfaces/index.ts
@@ -48,7 +48,6 @@ import type { Subscription } from './subscription.interface';
 import type { SymbolMetrics } from './symbol-metrics.interface';
 import type { SystemMessage } from './system-message.interface';
 import type { TabConfiguration } from './tab-configuration.interface';
-import type { TimelinePosition } from './timeline-position.interface';
 import type { UniqueAsset } from './unique-asset.interface';
 import type { UserSettings } from './user-settings.interface';
 import type { User } from './user.interface';
@@ -102,7 +101,6 @@ export {
   Subscription,
   SymbolMetrics,
   TabConfiguration,
-  TimelinePosition,
   UniqueAsset,
   User,
   UserSettings
diff --git a/libs/common/src/lib/interfaces/timeline-position.interface.ts b/libs/common/src/lib/interfaces/timeline-position.interface.ts
deleted file mode 100644
index 539f887ce..000000000
--- a/libs/common/src/lib/interfaces/timeline-position.interface.ts
+++ /dev/null
@@ -1,31 +0,0 @@
-import { DataSource, Tag } from '@prisma/client';
-import { Big } from 'big.js';
-
-export interface TimelinePosition {
-  averagePrice: Big;
-  currency: string;
-  dataSource: DataSource;
-  dividend: Big;
-  dividendInBaseCurrency: Big;
-  fee: Big;
-  firstBuyDate: string;
-  grossPerformance: Big;
-  grossPerformancePercentage: Big;
-  grossPerformancePercentageWithCurrencyEffect: Big;
-  grossPerformanceWithCurrencyEffect: Big;
-  investment: Big;
-  investmentWithCurrencyEffect: Big;
-  marketPrice: number;
-  marketPriceInBaseCurrency: number;
-  netPerformance: Big;
-  netPerformancePercentage: Big;
-  netPerformancePercentageWithCurrencyEffect: Big;
-  netPerformanceWithCurrencyEffect: Big;
-  quantity: Big;
-  symbol: string;
-  tags?: Tag[];
-  timeWeightedInvestment: Big;
-  timeWeightedInvestmentWithCurrencyEffect: Big;
-  transactionCount: number;
-  valueInBaseCurrency: Big;
-}
diff --git a/libs/common/src/lib/models/index.ts b/libs/common/src/lib/models/index.ts
new file mode 100644
index 000000000..e5f81fe3b
--- /dev/null
+++ b/libs/common/src/lib/models/index.ts
@@ -0,0 +1,3 @@
+import { TimelinePosition } from './timeline-position';
+
+export { TimelinePosition };
diff --git a/libs/common/src/lib/models/timeline-position.ts b/libs/common/src/lib/models/timeline-position.ts
new file mode 100644
index 000000000..412449590
--- /dev/null
+++ b/libs/common/src/lib/models/timeline-position.ts
@@ -0,0 +1,92 @@
+import { transformToBig } from '@ghostfolio/common/class-transformer';
+
+import { DataSource, Tag } from '@prisma/client';
+import { Big } from 'big.js';
+import { Transform, Type } from 'class-transformer';
+
+export class TimelinePosition {
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  averagePrice: Big;
+
+  currency: string;
+  dataSource: DataSource;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  dividend: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  dividendInBaseCurrency: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  fee: Big;
+
+  firstBuyDate: string;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  grossPerformance: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  grossPerformancePercentage: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  grossPerformancePercentageWithCurrencyEffect: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  grossPerformanceWithCurrencyEffect: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  investment: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  investmentWithCurrencyEffect: Big;
+
+  marketPrice: number;
+  marketPriceInBaseCurrency: number;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  netPerformance: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  netPerformancePercentage: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  netPerformancePercentageWithCurrencyEffect: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  netPerformanceWithCurrencyEffect: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  quantity: Big;
+
+  symbol: string;
+  tags?: Tag[];
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  timeWeightedInvestment: Big;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  timeWeightedInvestmentWithCurrencyEffect: Big;
+
+  transactionCount: number;
+
+  @Transform(transformToBig, { toClassOnly: true })
+  @Type(() => Big)
+  valueInBaseCurrency: Big;
+}