refactor

adapters/racing/persistence/inmemory/InMemoryScoringRepositories.ts

@@ -1,5 +1,5 @@
 import { Game } from '@core/racing/domain/entities/Game';
-import { Season } from '@core/racing/domain/entities/Season';
+import { Season } from '@core/racing/domain/entities/season/Season';
 import type { LeagueScoringConfig } from '@core/racing/domain/entities/LeagueScoringConfig';
 import { PointsTable } from '@core/racing/domain/value-objects/PointsTable';
 import type { ChampionshipConfig } from '@core/racing/domain/types/ChampionshipConfig';
@@ -10,7 +10,7 @@ import type { IGameRepository } from '@core/racing/domain/repositories/IGameRepo
 import type { ISeasonRepository } from '@core/racing/domain/repositories/ISeasonRepository';
 import type { ILeagueScoringConfigRepository } from '@core/racing/domain/repositories/ILeagueScoringConfigRepository';
 import type { IChampionshipStandingRepository } from '@core/racing/domain/repositories/IChampionshipStandingRepository';
-import { ChampionshipStanding } from '@core/racing/domain/entities/ChampionshipStanding';
+import { ChampionshipStanding } from '@core/racing/domain/entities/championship/ChampionshipStanding';
 import type { ChampionshipType } from '@core/racing/domain/types/ChampionshipType';
 import type { ParticipantRef } from '@core/racing/domain/types/ParticipantRef';
 import type { Logger } from '@core/shared/application';

adapters/racing/persistence/inmemory/InMemorySeasonRepository.ts

@@ -1,5 +1,5 @@
 import { ISeasonRepository } from '@core/racing/domain/repositories/ISeasonRepository';
-import { Season } from '@core/racing/domain/entities/Season';
+import { Season } from '@core/racing/domain/entities/season/Season';
 import { Logger } from '@core/shared/application';
 
 export class InMemorySeasonRepository implements ISeasonRepository {

core/racing/application/use-cases/CreateLeagueWithSeasonAndScoringUseCase.ts

@@ -81,7 +81,7 @@ export class CreateLeagueWithSeasonAndScoringUseCase
       this.logger.debug(`Generated seasonId: ${seasonId}`);
       const season = Season.create({
         id: seasonId,
-        leagueId: league.id,
+        leagueId: league.id.toString(),
         gameId: command.gameId,
         name: `${command.name} Season 1`,
         year: new Date().getFullYear(),
@@ -113,7 +113,7 @@ export class CreateLeagueWithSeasonAndScoringUseCase
       this.logger.info(`Scoring configuration saved for season ${seasonId}.`);
 
       const result: CreateLeagueWithSeasonAndScoringResultDTO = {
-        leagueId: league.id,
+        leagueId: league.id.toString(),
         seasonId,
         scoringPresetId: preset.id,
         scoringPresetName: preset.name,

core/racing/application/use-cases/CreateSeasonForLeagueUseCase.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, vi } from 'vitest';
 
-import { Season } from '@core/racing/domain/entities/Season';
+import { Season } from '@core/racing/domain/entities/season/Season';
 import type { ISeasonRepository } from '@core/racing/domain/repositories/ISeasonRepository';
 import type { ILeagueRepository } from '@core/racing/domain/repositories/ILeagueRepository';
 import {

core/racing/application/use-cases/GetAllRacesPageDataUseCase.ts

@@ -28,7 +28,7 @@ export class GetAllRacesPageDataUseCase
       ]);
       this.logger.info(`Found ${allRaces.length} races and ${allLeagues.length} leagues.`);
 
-      const leagueMap = new Map(allLeagues.map((league) => [league.id, league.name]));
+      const leagueMap = new Map(allLeagues.map((league) => [league.id.toString(), league.name.toString()]));
 
       const races: AllRacesListItemViewModel[] = allRaces
         .slice()
@@ -46,7 +46,7 @@ export class GetAllRacesPageDataUseCase
 
       const uniqueLeagues = new Map<string, { id: string; name: string }>();
       for (const league of allLeagues) {
-        uniqueLeagues.set(league.id, { id: league.id, name: league.name });
+        uniqueLeagues.set(league.id.toString(), { id: league.id.toString(), name: league.name.toString() });
       }
 
       const filters: AllRacesFilterOptionsViewModel = {

core/racing/application/use-cases/RecalculateChampionshipStandingsUseCase.ts

@@ -7,7 +7,7 @@ import type { IChampionshipStandingRepository } from '@core/racing/domain/reposi
 
 import type { ChampionshipConfig } from '@core/racing/domain/types/ChampionshipConfig';
 import type { SessionType } from '@core/racing/domain/types/SessionType';
-import type { ChampionshipStanding } from '@core/racing/domain/entities/ChampionshipStanding';
+import type { ChampionshipStanding } from '@core/racing/domain/entities/championship/ChampionshipStanding';
 import { EventScoringService } from '@core/racing/domain/services/EventScoringService';
 import { ChampionshipAggregator } from '@core/racing/domain/services/ChampionshipAggregator';
 
@@ -101,10 +101,10 @@ export class RecalculateChampionshipStandingsUseCase
 
     const rows: ChampionshipStandingsRowDTO[] = standings.map((s) => ({
       participant: s.participant,
-      position: s.position,
-      totalPoints: s.totalPoints,
-      resultsCounted: s.resultsCounted,
-      resultsDropped: s.resultsDropped,
+      position: s.position.toNumber(),
+      totalPoints: s.totalPoints.toNumber(),
+      resultsCounted: s.resultsCounted.toNumber(),
+      resultsDropped: s.resultsDropped.toNumber(),
     }));
 
     const dto: ChampionshipStandingsDTO = {

core/racing/application/use-cases/SeasonUseCases.test.ts

@@ -3,7 +3,7 @@ import { describe, it, expect } from 'vitest';
 import {
   InMemorySeasonRepository,
 } from '@core/racing/infrastructure/repositories/InMemoryScoringRepositories';
-import { Season } from '@core/racing/domain/entities/Season';
+import { Season } from '@core/racing/domain/entities/season/Season';
 import type { ISeasonRepository } from '@core/racing/domain/repositories/ISeasonRepository';
 import type { ILeagueRepository } from '@core/racing/domain/repositories/ILeagueRepository';
 import {

core/racing/domain/entities/AppliedAt.test.ts

@@ -0,0 +1,43 @@
+import { AppliedAt } from './AppliedAt';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('AppliedAt', () => {
+  describe('create', () => {
+    it('should create an AppliedAt with valid date', () => {
+      const date = new Date('2023-01-01T00:00:00Z');
+      const appliedAt = AppliedAt.create(date);
+      expect(appliedAt.toDate().getTime()).toBe(date.getTime());
+    });
+
+    it('should create a copy of the date', () => {
+      const date = new Date();
+      const appliedAt = AppliedAt.create(date);
+      date.setFullYear(2000); // modify original
+      expect(appliedAt.toDate().getFullYear()).not.toBe(2000);
+    });
+
+    it('should throw error for invalid date', () => {
+      expect(() => AppliedAt.create(new Date('invalid'))).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for non-Date', () => {
+      expect(() => AppliedAt.create('2023-01-01' as unknown as Date)).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('equals', () => {
+    it('should return true for equal dates', () => {
+      const date1 = new Date('2023-01-01T00:00:00Z');
+      const date2 = new Date('2023-01-01T00:00:00Z');
+      const appliedAt1 = AppliedAt.create(date1);
+      const appliedAt2 = AppliedAt.create(date2);
+      expect(appliedAt1.equals(appliedAt2)).toBe(true);
+    });
+
+    it('should return false for different dates', () => {
+      const appliedAt1 = AppliedAt.create(new Date('2023-01-01'));
+      const appliedAt2 = AppliedAt.create(new Date('2023-01-02'));
+      expect(appliedAt1.equals(appliedAt2)).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/AppliedAt.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class AppliedAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): AppliedAt {
+    if (!(value instanceof Date) || isNaN(value.getTime())) {
+      throw new RacingDomainValidationError('AppliedAt must be a valid Date');
+    }
+    return new AppliedAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: AppliedAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/Car.test.ts

@@ -0,0 +1,118 @@
+import { Car } from './Car';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('Car', () => {
+  describe('create', () => {
+    it('should create a car with required fields', () => {
+      const car = Car.create({
+        id: '1',
+        name: 'Ferrari 488',
+        manufacturer: 'Ferrari',
+        gameId: 'iracing',
+      });
+
+      expect(car.id.toString()).toBe('1');
+      expect(car.name.toString()).toBe('Ferrari 488');
+      expect(car.manufacturer.toString()).toBe('Ferrari');
+      expect(car.gameId.toString()).toBe('iracing');
+    });
+
+    it('should create a car with all fields', () => {
+      const car = Car.create({
+        id: '1',
+        name: 'Ferrari 488',
+        shortName: '488',
+        manufacturer: 'Ferrari',
+        carClass: 'gt',
+        license: 'Pro',
+        year: 2018,
+        horsepower: 661,
+        weight: 1320,
+        imageUrl: 'http://example.com/car.jpg',
+        gameId: 'iracing',
+      });
+
+      expect(car.id.toString()).toBe('1');
+      expect(car.name.toString()).toBe('Ferrari 488');
+      expect(car.shortName).toBe('488');
+      expect(car.manufacturer.toString()).toBe('Ferrari');
+      expect(car.carClass.toString()).toBe('gt');
+      expect(car.license.toString()).toBe('Pro');
+      expect(car.year.toNumber()).toBe(2018);
+      expect(car.horsepower?.toNumber()).toBe(661);
+      expect(car.weight?.toNumber()).toBe(1320);
+      expect(car.imageUrl?.toString()).toBe('http://example.com/car.jpg');
+      expect(car.gameId.toString()).toBe('iracing');
+    });
+
+    it('should use defaults for optional fields', () => {
+      const car = Car.create({
+        id: '1',
+        name: 'Ferrari 488',
+        manufacturer: 'Ferrari',
+        gameId: 'iracing',
+      });
+
+      expect(car.carClass.toString()).toBe('gt');
+      expect(car.license.toString()).toBe('D');
+      expect(car.year.toNumber()).toBe(new Date().getFullYear());
+      expect(car.shortName).toBe('Ferrari 48');
+    });
+
+    it('should throw error for invalid id', () => {
+      expect(() => Car.create({
+        id: '',
+        name: 'Ferrari 488',
+        manufacturer: 'Ferrari',
+        gameId: 'iracing',
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid name', () => {
+      expect(() => Car.create({
+        id: '1',
+        name: '',
+        manufacturer: 'Ferrari',
+        gameId: 'iracing',
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid manufacturer', () => {
+      expect(() => Car.create({
+        id: '1',
+        name: 'Ferrari 488',
+        manufacturer: '',
+        gameId: 'iracing',
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid gameId', () => {
+      expect(() => Car.create({
+        id: '1',
+        name: 'Ferrari 488',
+        manufacturer: 'Ferrari',
+        gameId: '',
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid horsepower', () => {
+      expect(() => Car.create({
+        id: '1',
+        name: 'Ferrari 488',
+        manufacturer: 'Ferrari',
+        gameId: 'iracing',
+        horsepower: 0,
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid weight', () => {
+      expect(() => Car.create({
+        id: '1',
+        name: 'Ferrari 488',
+        manufacturer: 'Ferrari',
+        gameId: 'iracing',
+        weight: -1,
+      })).toThrow(RacingDomainValidationError);
+    });
+  });
+});

core/racing/domain/entities/Car.ts

@@ -7,35 +7,42 @@
 
 import type { IEntity } from '@core/shared/domain';
 import { RacingDomainValidationError } from '../errors/RacingDomainError';
+import { CarName } from './CarName';
+import { Manufacturer } from './Manufacturer';
+import { CarClass, CarClassType } from './CarClass';
+import { CarLicense, CarLicenseType } from './CarLicense';
+import { Year } from './Year';
+import { Horsepower } from './Horsepower';
+import { Weight } from './Weight';
+import { GameId } from './GameId';
+import { CarId } from './CarId';
+import { ImageUrl } from './ImageUrl';
 
-export type CarClass = 'formula' | 'gt' | 'prototype' | 'touring' | 'sports' | 'oval' | 'dirt';
-export type CarLicense = 'R' | 'D' | 'C' | 'B' | 'A' | 'Pro';
-
-export class Car implements IEntity<string> {
-  readonly id: string;
-  readonly name: string;
+export class Car implements IEntity<CarId> {
+  readonly id: CarId;
+  readonly name: CarName;
   readonly shortName: string;
-  readonly manufacturer: string;
+  readonly manufacturer: Manufacturer;
   readonly carClass: CarClass;
   readonly license: CarLicense;
-  readonly year: number;
-  readonly horsepower: number | undefined;
-  readonly weight: number | undefined;
-  readonly imageUrl: string | undefined;
-  readonly gameId: string;
+  readonly year: Year;
+  readonly horsepower: Horsepower | undefined;
+  readonly weight: Weight | undefined;
+  readonly imageUrl: ImageUrl | undefined;
+  readonly gameId: GameId;
 
   private constructor(props: {
-    id: string;
-    name: string;
+    id: CarId;
+    name: CarName;
     shortName: string;
-    manufacturer: string;
+    manufacturer: Manufacturer;
     carClass: CarClass;
     license: CarLicense;
-    year: number;
-    horsepower?: number;
-    weight?: number;
-    imageUrl?: string;
-    gameId: string;
+    year: Year;
+    horsepower?: Horsepower;
+    weight?: Weight;
+    imageUrl?: ImageUrl;
+    gameId: GameId;
   }) {
     this.id = props.id;
     this.name = props.name;
@@ -58,8 +65,8 @@ export class Car implements IEntity<string> {
     name: string;
     shortName?: string;
     manufacturer: string;
-    carClass?: CarClass;
-    license?: CarLicense;
+    carClass?: CarClassType;
+    license?: CarLicenseType;
     year?: number;
     horsepower?: number;
     weight?: number;
@@ -69,17 +76,17 @@ export class Car implements IEntity<string> {
     this.validate(props);
 
     return new Car({
-      id: props.id,
-      name: props.name,
+      id: CarId.create(props.id),
+      name: CarName.create(props.name),
       shortName: props.shortName ?? props.name.slice(0, 10),
-      manufacturer: props.manufacturer,
-      carClass: props.carClass ?? 'gt',
-      license: props.license ?? 'D',
-      year: props.year ?? new Date().getFullYear(),
-      ...(props.horsepower !== undefined ? { horsepower: props.horsepower } : {}),
-      ...(props.weight !== undefined ? { weight: props.weight } : {}),
-      ...(props.imageUrl !== undefined ? { imageUrl: props.imageUrl } : {}),
-      gameId: props.gameId,
+      manufacturer: Manufacturer.create(props.manufacturer),
+      carClass: CarClass.create(props.carClass ?? 'gt'),
+      license: CarLicense.create(props.license ?? 'D'),
+      year: Year.create(props.year ?? new Date().getFullYear()),
+      ...(props.horsepower !== undefined ? { horsepower: Horsepower.create(props.horsepower) } : {}),
+      ...(props.weight !== undefined ? { weight: Weight.create(props.weight) } : {}),
+      ...(props.imageUrl !== undefined ? { imageUrl: ImageUrl.create(props.imageUrl) } : {}),
+      gameId: GameId.create(props.gameId),
     });
   }
 
@@ -109,25 +116,4 @@ export class Car implements IEntity<string> {
     }
   }
 
-  /**
-   * Get formatted car display name
-   */
-  getDisplayName(): string {
-    return `${this.manufacturer} ${this.name}`;
-  }
-
-  /**
-   * Get license badge color
-   */
-  getLicenseColor(): string {
-    const colors: Record<CarLicense, string> = {
-      'R': '#FF6B6B',
-      'D': '#FFB347',
-      'C': '#FFD700',
-      'B': '#7FFF00',
-      'A': '#00BFFF',
-      'Pro': '#9370DB',
-    };
-    return colors[this.license];
-  }
 }

core/racing/domain/entities/CarClass.ts

@@ -0,0 +1,17 @@
+export type CarClassType = 'formula' | 'gt' | 'prototype' | 'touring' | 'sports' | 'oval' | 'dirt';
+
+export class CarClass {
+  private constructor(private readonly value: CarClassType) {}
+
+  static create(value: CarClassType): CarClass {
+    return new CarClass(value);
+  }
+
+  toString(): CarClassType {
+    return this.value;
+  }
+
+  equals(other: CarClass): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/CarId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class CarId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): CarId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Car ID cannot be empty');
+    }
+    return new CarId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: CarId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/CarLicense.ts

@@ -0,0 +1,17 @@
+export type CarLicenseType = 'R' | 'D' | 'C' | 'B' | 'A' | 'Pro';
+
+export class CarLicense {
+  private constructor(private readonly value: CarLicenseType) {}
+
+  static create(value: CarLicenseType): CarLicense {
+    return new CarLicense(value);
+  }
+
+  toString(): CarLicenseType {
+    return this.value;
+  }
+
+  equals(other: CarLicense): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/CarName.ts

@@ -0,0 +1,23 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class CarName {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): CarName {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Car name cannot be empty');
+    }
+    if (value.length > 100) {
+      throw new RacingDomainValidationError('Car name cannot exceed 100 characters');
+    }
+    return new CarName(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: CarName): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/ChampionshipStanding.ts

@@ -1,41 +0,0 @@
-import type { ParticipantRef } from '../types/ParticipantRef';
-
-export class ChampionshipStanding {
-  readonly seasonId: string;
-  readonly championshipId: string;
-  readonly participant: ParticipantRef;
-  readonly totalPoints: number;
-  readonly resultsCounted: number;
-  readonly resultsDropped: number;
-  readonly position: number;
-
-  constructor(props: {
-    seasonId: string;
-    championshipId: string;
-    participant: ParticipantRef;
-    totalPoints: number;
-    resultsCounted: number;
-    resultsDropped: number;
-    position: number;
-  }) {
-    this.seasonId = props.seasonId;
-    this.championshipId = props.championshipId;
-    this.participant = props.participant;
-    this.totalPoints = props.totalPoints;
-    this.resultsCounted = props.resultsCounted;
-    this.resultsDropped = props.resultsDropped;
-    this.position = props.position;
-  }
-
-  withPosition(position: number): ChampionshipStanding {
-    return new ChampionshipStanding({
-      seasonId: this.seasonId,
-      championshipId: this.championshipId,
-      participant: this.participant,
-      totalPoints: this.totalPoints,
-      resultsCounted: this.resultsCounted,
-      resultsDropped: this.resultsDropped,
-      position,
-    });
-  }
-}

core/racing/domain/entities/DecisionNotes.ts

@@ -0,0 +1,21 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class DecisionNotes {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): DecisionNotes {
+    const trimmed = value.trim();
+    if (!trimmed) {
+      throw new RacingDomainValidationError('Decision notes cannot be empty');
+    }
+    return new DecisionNotes(trimmed);
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: DecisionNotes): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/DefenseRequestedAt.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class DefenseRequestedAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): DefenseRequestedAt {
+    if (!(value instanceof Date) || isNaN(value.getTime())) {
+      throw new RacingDomainValidationError('DefenseRequestedAt must be a valid Date');
+    }
+    return new DefenseRequestedAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: DefenseRequestedAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/DefenseStatement.ts

@@ -0,0 +1,21 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class DefenseStatement {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): DefenseStatement {
+    const trimmed = value.trim();
+    if (!trimmed) {
+      throw new RacingDomainValidationError('Defense statement cannot be empty');
+    }
+    return new DefenseStatement(trimmed);
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: DefenseStatement): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/Driver.test.ts

@@ -0,0 +1,155 @@
+import { describe, it, expect } from 'vitest';
+import { Driver } from './Driver';
+
+describe('Driver', () => {
+  it('should create a driver', () => {
+    const driver = Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+      bio: 'A passionate racer.',
+      joinedAt: new Date('2020-01-01'),
+    });
+
+    expect(driver.id).toBe('driver1');
+    expect(driver.iracingId.toString()).toBe('12345');
+    expect(driver.name.toString()).toBe('John Doe');
+    expect(driver.country.toString()).toBe('US');
+    expect(driver.bio?.toString()).toBe('A passionate racer.');
+    expect(driver.joinedAt.toDate()).toEqual(new Date('2020-01-01'));
+  });
+
+  it('should create driver without bio', () => {
+    const driver = Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+    });
+
+    expect(driver.bio).toBeUndefined();
+  });
+
+  it('should create driver with default joinedAt', () => {
+    const before = new Date();
+    const driver = Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+    });
+    const after = new Date();
+
+    expect(driver.joinedAt.toDate().getTime()).toBeGreaterThanOrEqual(before.getTime());
+    expect(driver.joinedAt.toDate().getTime()).toBeLessThanOrEqual(after.getTime());
+  });
+
+  it('should update name', () => {
+    const driver = Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+    });
+
+    const updated = driver.update({ name: 'Jane Doe' });
+    expect(updated.name.toString()).toBe('Jane Doe');
+    expect(updated.id).toBe('driver1');
+  });
+
+  it('should update country', () => {
+    const driver = Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+    });
+
+    const updated = driver.update({ country: 'CA' });
+    expect(updated.country.toString()).toBe('CA');
+  });
+
+  it('should update bio', () => {
+    const driver = Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+      bio: 'Old bio',
+    });
+
+    const updated = driver.update({ bio: 'New bio' });
+    expect(updated.bio?.toString()).toBe('New bio');
+  });
+
+  it('should remove bio', () => {
+    const driver = Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+      bio: 'Old bio',
+    });
+
+    const updated = driver.update({ bio: undefined });
+    expect(updated.bio).toBeUndefined();
+  });
+
+  it('should throw on invalid id', () => {
+    expect(() => Driver.create({
+      id: '',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+    })).toThrow('Driver ID is required');
+  });
+
+  it('should throw on invalid iracingId', () => {
+    expect(() => Driver.create({
+      id: 'driver1',
+      iracingId: '',
+      name: 'John Doe',
+      country: 'US',
+    })).toThrow('iRacing ID is required');
+  });
+
+  it('should throw on invalid name', () => {
+    expect(() => Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: '',
+      country: 'US',
+    })).toThrow('Driver name is required');
+  });
+
+  it('should throw on invalid country', () => {
+    expect(() => Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: '',
+    })).toThrow('Country code is required');
+  });
+
+  it('should throw on invalid country format', () => {
+    expect(() => Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'U',
+    })).toThrow('Country must be a valid ISO code (2-3 letters)');
+  });
+
+  it('should throw on future joinedAt', () => {
+    const future = new Date();
+    future.setFullYear(future.getFullYear() + 1);
+    expect(() => Driver.create({
+      id: 'driver1',
+      iracingId: '12345',
+      name: 'John Doe',
+      country: 'US',
+      joinedAt: future,
+    })).toThrow('Joined date cannot be in the future');
+  });
+});

core/racing/domain/entities/Driver.ts

@@ -4,25 +4,30 @@
  * Represents a driver profile in the GridPilot platform.
  * Immutable entity with factory methods and domain validation.
  */
- 
+
 import { RacingDomainValidationError } from '../errors/RacingDomainError';
 import type { IEntity } from '@core/shared/domain';
- 
+import { IRacingId } from '../value-objects/IRacingId';
+import { DriverName } from '../value-objects/DriverName';
+import { CountryCode } from '../value-objects/CountryCode';
+import { DriverBio } from '../value-objects/DriverBio';
+import { JoinedAt } from '../value-objects/JoinedAt';
+
 export class Driver implements IEntity<string> {
   readonly id: string;
-  readonly iracingId: string;
-  readonly name: string;
-  readonly country: string;
-  readonly bio: string | undefined;
-  readonly joinedAt: Date;
+  readonly iracingId: IRacingId;
+  readonly name: DriverName;
+  readonly country: CountryCode;
+  readonly bio: DriverBio | undefined;
+  readonly joinedAt: JoinedAt;
 
   private constructor(props: {
     id: string;
-    iracingId: string;
-    name: string;
-    country: string;
-    bio?: string;
-    joinedAt: Date;
+    iracingId: IRacingId;
+    name: DriverName;
+    country: CountryCode;
+    bio?: DriverBio;
+    joinedAt: JoinedAt;
   }) {
     this.id = props.id;
     this.iracingId = props.iracingId;
@@ -43,47 +48,18 @@ export class Driver implements IEntity<string> {
     bio?: string;
     joinedAt?: Date;
   }): Driver {
-    this.validate(props);
-
-    return new Driver({
-      id: props.id,
-      iracingId: props.iracingId,
-      name: props.name,
-      country: props.country,
-      ...(props.bio !== undefined ? { bio: props.bio } : {}),
-      joinedAt: props.joinedAt ?? new Date(),
-    });
-  }
-
-  /**
-   * Domain validation logic
-   */
-  private static validate(props: {
-    id: string;
-    iracingId: string;
-    name: string;
-    country: string;
-  }): void {
     if (!props.id || props.id.trim().length === 0) {
       throw new RacingDomainValidationError('Driver ID is required');
     }
 
-    if (!props.iracingId || props.iracingId.trim().length === 0) {
-      throw new RacingDomainValidationError('iRacing ID is required');
-    }
-
-    if (!props.name || props.name.trim().length === 0) {
-      throw new RacingDomainValidationError('Driver name is required');
-    }
-
-    if (!props.country || props.country.trim().length === 0) {
-      throw new RacingDomainValidationError('Country code is required');
-    }
-
-    // Validate ISO country code format (2-3 letters)
-    if (!/^[A-Z]{2,3}$/i.test(props.country)) {
-      throw new RacingDomainValidationError('Country must be a valid ISO code (2-3 letters)');
-    }
+    return new Driver({
+      id: props.id,
+      iracingId: IRacingId.create(props.iracingId),
+      name: DriverName.create(props.name),
+      country: CountryCode.create(props.country),
+      ...(props.bio !== undefined ? { bio: DriverBio.create(props.bio) } : {}),
+      joinedAt: JoinedAt.create(props.joinedAt ?? new Date()),
+    });
   }
 
   /**
@@ -92,11 +68,11 @@ export class Driver implements IEntity<string> {
   update(props: Partial<{
     name: string;
     country: string;
-    bio?: string;
+    bio: string | undefined;
   }>): Driver {
-    const nextName = props.name ?? this.name;
-    const nextCountry = props.country ?? this.country;
-    const nextBio = props.bio ?? this.bio;
+    const nextName = 'name' in props ? DriverName.create(props.name!) : this.name;
+    const nextCountry = 'country' in props ? CountryCode.create(props.country!) : this.country;
+    const nextBio = 'bio' in props ? (props.bio ? DriverBio.create(props.bio) : undefined) : this.bio;
 
     return new Driver({
       id: this.id,

core/racing/domain/entities/DriverId.test.ts

@@ -0,0 +1,38 @@
+import { DriverId } from './DriverId';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('DriverId', () => {
+  describe('create', () => {
+    it('should create a DriverId with valid value', () => {
+      const id = DriverId.create('driver-123');
+      expect(id.toString()).toBe('driver-123');
+    });
+
+    it('should trim whitespace', () => {
+      const id = DriverId.create('  driver-123  ');
+      expect(id.toString()).toBe('driver-123');
+    });
+
+    it('should throw error for empty string', () => {
+      expect(() => DriverId.create('')).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for whitespace only', () => {
+      expect(() => DriverId.create('   ')).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('equals', () => {
+    it('should return true for equal ids', () => {
+      const id1 = DriverId.create('driver-123');
+      const id2 = DriverId.create('driver-123');
+      expect(id1.equals(id2)).toBe(true);
+    });
+
+    it('should return false for different ids', () => {
+      const id1 = DriverId.create('driver-123');
+      const id2 = DriverId.create('driver-456');
+      expect(id1.equals(id2)).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/DriverId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class DriverId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): DriverId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Driver ID cannot be empty');
+    }
+    return new DriverId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: DriverId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/DriverLivery.test.ts

@@ -0,0 +1,245 @@
+import { describe, it, expect } from 'vitest';
+import { DriverLivery } from './DriverLivery';
+import { LiveryDecal } from '../value-objects/LiveryDecal';
+import { DecalOverride } from '../value-objects/DecalOverride';
+import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
+
+describe('DriverLivery', () => {
+  const validProps = {
+    id: 'livery-1',
+    driverId: 'driver-1',
+    gameId: 'game-1',
+    carId: 'car-1',
+    uploadedImageUrl: 'https://example.com/image.png',
+  };
+
+  describe('create', () => {
+    it('should create a valid DriverLivery', () => {
+      const livery = DriverLivery.create(validProps);
+
+      expect(livery.id).toBe('livery-1');
+      expect(livery.driverId.toString()).toBe('driver-1');
+      expect(livery.gameId.toString()).toBe('game-1');
+      expect(livery.carId.toString()).toBe('car-1');
+      expect(livery.uploadedImageUrl.toString()).toBe('https://example.com/image.png');
+      expect(livery.userDecals).toEqual([]);
+      expect(livery.leagueOverrides).toEqual([]);
+      expect(livery.isValidated()).toBe(false);
+    });
+
+    it('should throw error for invalid id', () => {
+      expect(() => DriverLivery.create({ ...validProps, id: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid driverId', () => {
+      expect(() => DriverLivery.create({ ...validProps, driverId: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid gameId', () => {
+      expect(() => DriverLivery.create({ ...validProps, gameId: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid carId', () => {
+      expect(() => DriverLivery.create({ ...validProps, carId: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid uploadedImageUrl', () => {
+      expect(() => DriverLivery.create({ ...validProps, uploadedImageUrl: '' })).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('addDecal', () => {
+    it('should add a user decal', () => {
+      const livery = DriverLivery.create(validProps);
+      const decal = LiveryDecal.create({
+        id: 'decal-1',
+        imageUrl: 'https://example.com/decal.png',
+        x: 0.5,
+        y: 0.5,
+        width: 0.1,
+        height: 0.1,
+        zIndex: 1,
+        type: 'user',
+      });
+
+      const updatedLivery = livery.addDecal(decal);
+
+      expect(updatedLivery.userDecals).toHaveLength(1);
+      expect(updatedLivery.userDecals[0]).toBe(decal);
+      expect(updatedLivery.updatedAt).toBeInstanceOf(Date);
+    });
+
+    it('should throw error for non-user decal', () => {
+      const livery = DriverLivery.create(validProps);
+      const decal = LiveryDecal.create({
+        id: 'decal-1',
+        imageUrl: 'https://example.com/decal.png',
+        x: 0.5,
+        y: 0.5,
+        width: 0.1,
+        height: 0.1,
+        zIndex: 1,
+        type: 'sponsor',
+      });
+
+      expect(() => livery.addDecal(decal)).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('removeDecal', () => {
+    it('should remove a decal', () => {
+      const decal = LiveryDecal.create({
+        id: 'decal-1',
+        imageUrl: 'https://example.com/decal.png',
+        x: 0.5,
+        y: 0.5,
+        width: 0.1,
+        height: 0.1,
+        zIndex: 1,
+        type: 'user',
+      });
+      const livery = DriverLivery.create({ ...validProps, userDecals: [decal] });
+
+      const updatedLivery = livery.removeDecal('decal-1');
+
+      expect(updatedLivery.userDecals).toHaveLength(0);
+    });
+
+    it('should throw error if decal not found', () => {
+      const livery = DriverLivery.create(validProps);
+
+      expect(() => livery.removeDecal('nonexistent')).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('updateDecal', () => {
+    it('should update a decal', () => {
+      const decal = LiveryDecal.create({
+        id: 'decal-1',
+        imageUrl: 'https://example.com/decal.png',
+        x: 0.5,
+        y: 0.5,
+        width: 0.1,
+        height: 0.1,
+        zIndex: 1,
+        type: 'user',
+      });
+      const livery = DriverLivery.create({ ...validProps, userDecals: [decal] });
+      const updatedDecal = decal.moveTo(0.6, 0.6);
+
+      const updatedLivery = livery.updateDecal('decal-1', updatedDecal);
+
+      expect(updatedLivery.userDecals[0]).toBe(updatedDecal);
+    });
+
+    it('should throw error if decal not found', () => {
+      const livery = DriverLivery.create(validProps);
+      const decal = LiveryDecal.create({
+        id: 'decal-1',
+        imageUrl: 'https://example.com/decal.png',
+        x: 0.5,
+        y: 0.5,
+        width: 0.1,
+        height: 0.1,
+        zIndex: 1,
+        type: 'user',
+      });
+
+      expect(() => livery.updateDecal('nonexistent', decal)).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('setLeagueOverride', () => {
+    it('should add a league override', () => {
+      const livery = DriverLivery.create(validProps);
+
+      const updatedLivery = livery.setLeagueOverride('league-1', 'season-1', 'decal-1', 0.5, 0.5);
+
+      expect(updatedLivery.leagueOverrides).toHaveLength(1);
+      expect(updatedLivery.leagueOverrides[0].leagueId).toBe('league-1');
+    });
+
+    it('should update existing override', () => {
+      const override = DecalOverride.create({
+        leagueId: 'league-1',
+        seasonId: 'season-1',
+        decalId: 'decal-1',
+        newX: 0.5,
+        newY: 0.5,
+      });
+      const livery = DriverLivery.create({ ...validProps, leagueOverrides: [override] });
+
+      const updatedLivery = livery.setLeagueOverride('league-1', 'season-1', 'decal-1', 0.6, 0.6);
+
+      expect(updatedLivery.leagueOverrides).toHaveLength(1);
+      expect(updatedLivery.leagueOverrides[0].newX).toBe(0.6);
+    });
+  });
+
+  describe('removeLeagueOverride', () => {
+    it('should remove a league override', () => {
+      const override = DecalOverride.create({
+        leagueId: 'league-1',
+        seasonId: 'season-1',
+        decalId: 'decal-1',
+        newX: 0.5,
+        newY: 0.5,
+      });
+      const livery = DriverLivery.create({ ...validProps, leagueOverrides: [override] });
+
+      const updatedLivery = livery.removeLeagueOverride('league-1', 'season-1', 'decal-1');
+
+      expect(updatedLivery.leagueOverrides).toHaveLength(0);
+    });
+  });
+
+  describe('getOverridesFor', () => {
+    it('should return overrides for league and season', () => {
+      const override1 = DecalOverride.create({
+        leagueId: 'league-1',
+        seasonId: 'season-1',
+        decalId: 'decal-1',
+        newX: 0.5,
+        newY: 0.5,
+      });
+      const override2 = DecalOverride.create({
+        leagueId: 'league-1',
+        seasonId: 'season-2',
+        decalId: 'decal-2',
+        newX: 0.6,
+        newY: 0.6,
+      });
+      const livery = DriverLivery.create({ ...validProps, leagueOverrides: [override1, override2] });
+
+      const overrides = livery.getOverridesFor('league-1', 'season-1');
+
+      expect(overrides).toHaveLength(1);
+      expect(overrides[0]).toBe(override1);
+    });
+  });
+
+  describe('markAsValidated', () => {
+    it('should mark livery as validated', () => {
+      const livery = DriverLivery.create(validProps);
+
+      const validatedLivery = livery.markAsValidated();
+
+      expect(validatedLivery.isValidated()).toBe(true);
+      expect(validatedLivery.validatedAt).toBeInstanceOf(Date);
+    });
+  });
+
+  describe('isValidated', () => {
+    it('should return false when not validated', () => {
+      const livery = DriverLivery.create(validProps);
+
+      expect(livery.isValidated()).toBe(false);
+    });
+
+    it('should return true when validated', () => {
+      const livery = DriverLivery.create(validProps).markAsValidated();
+
+      expect(livery.isValidated()).toBe(true);
+    });
+  });
+});

core/racing/domain/entities/DriverLivery.ts

@@ -7,22 +7,20 @@
 
 import type { IEntity } from '@core/shared/domain';
 
-import type { LiveryDecal } from '../value-objects/LiveryDecal';
-
-export interface DecalOverride {
-  leagueId: string;
-  seasonId: string;
-  decalId: string;
-  newX: number;
-  newY: number;
-}
+import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
+import { LiveryDecal } from '../value-objects/LiveryDecal';
+import { DecalOverride } from '../value-objects/DecalOverride';
+import { DriverId } from '../value-objects/DriverId';
+import { GameId } from './GameId';
+import { CarId } from '../value-objects/CarId';
+import { ImageUrl } from '../value-objects/ImageUrl';
 
 export interface DriverLiveryProps {
   id: string;
-  driverId: string;
-  gameId: string;
-  carId: string;
-  uploadedImageUrl: string;
+  driverId: DriverId;
+  gameId: GameId;
+  carId: CarId;
+  uploadedImageUrl: ImageUrl;
   userDecals: LiveryDecal[];
   leagueOverrides: DecalOverride[];
   createdAt: Date;
@@ -32,10 +30,10 @@ export interface DriverLiveryProps {
 
 export class DriverLivery implements IEntity<string> {
   readonly id: string;
-  readonly driverId: string;
-  readonly gameId: string;
-  readonly carId: string;
-  readonly uploadedImageUrl: string;
+  readonly driverId: DriverId;
+  readonly gameId: GameId;
+  readonly carId: CarId;
+  readonly uploadedImageUrl: ImageUrl;
   readonly userDecals: LiveryDecal[];
   readonly leagueOverrides: DecalOverride[];
   readonly createdAt: Date;
@@ -55,7 +53,12 @@ export class DriverLivery implements IEntity<string> {
     this.validatedAt = props.validatedAt;
   }
 
-  static create(props: Omit<DriverLiveryProps, 'createdAt' | 'userDecals' | 'leagueOverrides'> & {
+  static create(props: {
+    id: string;
+    driverId: string;
+    gameId: string;
+    carId: string;
+    uploadedImageUrl: string;
     createdAt?: Date;
     userDecals?: LiveryDecal[];
     leagueOverrides?: DecalOverride[];
@@ -63,14 +66,26 @@ export class DriverLivery implements IEntity<string> {
     this.validate(props);
 
     return new DriverLivery({
-      ...props,
-      createdAt: props.createdAt ?? new Date(),
+      id: props.id,
+      driverId: DriverId.create(props.driverId),
+      gameId: GameId.create(props.gameId),
+      carId: CarId.create(props.carId),
+      uploadedImageUrl: ImageUrl.create(props.uploadedImageUrl),
       userDecals: props.userDecals ?? [],
       leagueOverrides: props.leagueOverrides ?? [],
+      createdAt: props.createdAt ?? new Date(),
+      updatedAt: undefined,
+      validatedAt: undefined,
     });
   }
 
-  private static validate(props: Omit<DriverLiveryProps, 'createdAt' | 'userDecals' | 'leagueOverrides'>): void {
+  private static validate(props: {
+    id: string;
+    driverId: string;
+    gameId: string;
+    carId: string;
+    uploadedImageUrl: string;
+  }): void {
     if (!props.id || props.id.trim().length === 0) {
       throw new RacingDomainValidationError('DriverLivery ID is required');
     }
@@ -173,8 +188,8 @@ export class DriverLivery implements IEntity<string> {
       o => o.leagueId === leagueId && o.seasonId === seasonId && o.decalId === decalId
     );
 
-    const override: DecalOverride = { leagueId, seasonId, decalId, newX, newY };
-    
+    const override = DecalOverride.create({ leagueId, seasonId, decalId, newX, newY });
+
     let updatedOverrides: DecalOverride[];
     if (existingIndex >= 0) {
       updatedOverrides = [...this.leagueOverrides];

core/racing/domain/entities/FiledAt.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class FiledAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): FiledAt {
+    if (!(value instanceof Date) || isNaN(value.getTime())) {
+      throw new RacingDomainValidationError('FiledAt must be a valid Date');
+    }
+    return new FiledAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: FiledAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/Game.test.ts

@@ -0,0 +1,36 @@
+import { describe, it, expect } from 'vitest';
+import { Game } from './Game';
+
+describe('Game', () => {
+  it('should create a game', () => {
+    const game = Game.create({
+      id: 'game1',
+      name: 'iRacing',
+    });
+
+    expect(game.id.toString()).toBe('game1');
+    expect(game.name.toString()).toBe('iRacing');
+  });
+
+  it('should throw on invalid id', () => {
+    expect(() => Game.create({
+      id: '',
+      name: 'iRacing',
+    })).toThrow('Game ID cannot be empty');
+  });
+
+  it('should throw on invalid name', () => {
+    expect(() => Game.create({
+      id: 'game1',
+      name: '',
+    })).toThrow('Game name cannot be empty');
+  });
+
+  it('should throw on name too long', () => {
+    const longName = 'a'.repeat(51);
+    expect(() => Game.create({
+      id: 'game1',
+      name: longName,
+    })).toThrow('Game name cannot exceed 50 characters');
+  });
+});

core/racing/domain/entities/Game.ts

@@ -1,27 +1,23 @@
-import { RacingDomainValidationError } from '../errors/RacingDomainError';
 import type { IEntity } from '@core/shared/domain';
- 
-export class Game implements IEntity<string> {
-  readonly id: string;
-  readonly name: string;
+import { GameId } from './GameId';
+import { GameName } from './GameName';
 
-  private constructor(props: { id: string; name: string }) {
+export class Game implements IEntity<GameId> {
+  readonly id: GameId;
+  readonly name: GameName;
+
+  private constructor(props: { id: GameId; name: GameName }) {
     this.id = props.id;
     this.name = props.name;
   }
 
   static create(props: { id: string; name: string }): Game {
-    if (!props.id || props.id.trim().length === 0) {
-      throw new RacingDomainValidationError('Game ID is required');
-    }
-
-    if (!props.name || props.name.trim().length === 0) {
-      throw new RacingDomainValidationError('Game name is required');
-    }
+    const id = GameId.create(props.id);
+    const name = GameName.create(props.name);
 
     return new Game({
-      id: props.id,
-      name: props.name,
+      id,
+      name,
     });
   }
 }

core/racing/domain/entities/GameId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class GameId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): GameId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Game ID cannot be empty');
+    }
+    return new GameId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: GameId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/GameName.ts

@@ -0,0 +1,23 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class GameName {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): GameName {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Game name cannot be empty');
+    }
+    if (value.length > 50) {
+      throw new RacingDomainValidationError('Game name cannot exceed 50 characters');
+    }
+    return new GameName(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: GameName): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/Horsepower.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class Horsepower {
+  private constructor(private readonly value: number) {}
+
+  static create(value: number): Horsepower {
+    if (value <= 0) {
+      throw new RacingDomainValidationError('Horsepower must be positive');
+    }
+    return new Horsepower(value);
+  }
+
+  toNumber(): number {
+    return this.value;
+  }
+
+  equals(other: Horsepower): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/ImageUrl.ts

@@ -0,0 +1,26 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class ImageUrl {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): ImageUrl {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Image URL cannot be empty');
+    }
+    // Basic URL validation
+    try {
+      new URL(value);
+    } catch {
+      throw new RacingDomainValidationError('Invalid image URL format');
+    }
+    return new ImageUrl(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: ImageUrl): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/IncidentDescription.ts

@@ -0,0 +1,21 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class IncidentDescription {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): IncidentDescription {
+    const trimmed = value.trim();
+    if (!trimmed) {
+      throw new RacingDomainValidationError('Incident description cannot be empty');
+    }
+    return new IncidentDescription(trimmed);
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: IncidentDescription): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/IssuedAt.test.ts

@@ -0,0 +1,43 @@
+import { IssuedAt } from './IssuedAt';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('IssuedAt', () => {
+  describe('create', () => {
+    it('should create an IssuedAt with valid date', () => {
+      const date = new Date('2023-01-01T00:00:00Z');
+      const issuedAt = IssuedAt.create(date);
+      expect(issuedAt.toDate().getTime()).toBe(date.getTime());
+    });
+
+    it('should create a copy of the date', () => {
+      const date = new Date();
+      const issuedAt = IssuedAt.create(date);
+      date.setFullYear(2000); // modify original
+      expect(issuedAt.toDate().getFullYear()).not.toBe(2000);
+    });
+
+    it('should throw error for invalid date', () => {
+      expect(() => IssuedAt.create(new Date('invalid'))).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for non-Date', () => {
+      expect(() => IssuedAt.create('2023-01-01' as unknown as Date)).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('equals', () => {
+    it('should return true for equal dates', () => {
+      const date1 = new Date('2023-01-01T00:00:00Z');
+      const date2 = new Date('2023-01-01T00:00:00Z');
+      const issuedAt1 = IssuedAt.create(date1);
+      const issuedAt2 = IssuedAt.create(date2);
+      expect(issuedAt1.equals(issuedAt2)).toBe(true);
+    });
+
+    it('should return false for different dates', () => {
+      const issuedAt1 = IssuedAt.create(new Date('2023-01-01'));
+      const issuedAt2 = IssuedAt.create(new Date('2023-01-02'));
+      expect(issuedAt1.equals(issuedAt2)).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/IssuedAt.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class IssuedAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): IssuedAt {
+    if (!(value instanceof Date) || isNaN(value.getTime())) {
+      throw new RacingDomainValidationError('IssuedAt must be a valid Date');
+    }
+    return new IssuedAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: IssuedAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/JoinRequest.ts

@@ -0,0 +1,60 @@
+/**
+ * Domain Entity: JoinRequest
+ *
+ * Represents a request to join a league.
+ */
+
+import type { IEntity } from '@core/shared/domain';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+import { LeagueId } from './LeagueId';
+import { LeagueOwnerId } from './LeagueOwnerId';
+import { JoinedAt } from '../value-objects/JoinedAt';
+
+export interface JoinRequestProps {
+  id?: string;
+  leagueId: string;
+  driverId: string;
+  requestedAt?: Date;
+  message?: string;
+}
+
+export class JoinRequest implements IEntity<string> {
+  readonly id: string;
+  readonly leagueId: LeagueId;
+  readonly driverId: LeagueOwnerId;
+  readonly requestedAt: JoinedAt;
+  readonly message: string | undefined;
+
+  private constructor(props: { id: string; leagueId: string; driverId: string; requestedAt: Date; message?: string }) {
+    this.id = props.id;
+    this.leagueId = LeagueId.create(props.leagueId);
+    this.driverId = LeagueOwnerId.create(props.driverId);
+    this.requestedAt = JoinedAt.create(props.requestedAt);
+    this.message = props.message;
+  }
+
+  static create(props: JoinRequestProps): JoinRequest {
+    this.validate(props);
+
+    const id = props.id && props.id.trim().length > 0 ? props.id : `${props.leagueId}:${props.driverId}`;
+    const requestedAt = props.requestedAt ?? new Date();
+
+    return new JoinRequest({
+      id,
+      leagueId: props.leagueId,
+      driverId: props.driverId,
+      requestedAt,
+      message: props.message,
+    });
+  }
+
+  private static validate(props: JoinRequestProps): void {
+    if (!props.leagueId || props.leagueId.trim().length === 0) {
+      throw new RacingDomainValidationError('League ID is required');
+    }
+
+    if (!props.driverId || props.driverId.trim().length === 0) {
+      throw new RacingDomainValidationError('Driver ID is required');
+    }
+  }
+}

core/racing/domain/entities/LapNumber.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LapNumber {
+  private constructor(private readonly value: number) {}
+
+  static create(value: number): LapNumber {
+    if (!Number.isInteger(value) || value < 0) {
+      throw new RacingDomainValidationError('Lap number must be a non-negative integer');
+    }
+    return new LapNumber(value);
+  }
+
+  toNumber(): number {
+    return this.value;
+  }
+
+  equals(other: LapNumber): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/League.test.ts

@@ -0,0 +1,116 @@
+import { describe, it, expect } from 'vitest';
+import { League } from './League';
+
+describe('League', () => {
+  it('should create a league', () => {
+    const league = League.create({
+      id: 'league1',
+      name: 'Test League',
+      description: 'A test league',
+      ownerId: 'owner1',
+    });
+
+    expect(league.id.toString()).toBe('league1');
+    expect(league.name.toString()).toBe('Test League');
+    expect(league.description.toString()).toBe('A test league');
+    expect(league.ownerId.toString()).toBe('owner1');
+  });
+
+  it('should throw on invalid id', () => {
+    expect(() => League.create({
+      id: '',
+      name: 'Test League',
+      description: 'A test league',
+      ownerId: 'owner1',
+    })).toThrow('League ID cannot be empty');
+  });
+
+  it('should throw on invalid name', () => {
+    expect(() => League.create({
+      id: 'league1',
+      name: '',
+      description: 'A test league',
+      ownerId: 'owner1',
+    })).toThrow('League name cannot be empty');
+  });
+
+  it('should throw on name too long', () => {
+    const longName = 'a'.repeat(101);
+    expect(() => League.create({
+      id: 'league1',
+      name: longName,
+      description: 'A test league',
+      ownerId: 'owner1',
+    })).toThrow('League name cannot exceed 100 characters');
+  });
+
+  it('should throw on invalid description', () => {
+    expect(() => League.create({
+      id: 'league1',
+      name: 'Test League',
+      description: '',
+      ownerId: 'owner1',
+    })).toThrow('League description cannot be empty');
+  });
+
+  it('should throw on description too long', () => {
+    const longDesc = 'a'.repeat(501);
+    expect(() => League.create({
+      id: 'league1',
+      name: 'Test League',
+      description: longDesc,
+      ownerId: 'owner1',
+    })).toThrow('League description cannot exceed 500 characters');
+  });
+
+  it('should throw on invalid ownerId', () => {
+    expect(() => League.create({
+      id: 'league1',
+      name: 'Test League',
+      description: 'A test league',
+      ownerId: '',
+    })).toThrow('League owner ID cannot be empty');
+  });
+
+  it('should create with social links', () => {
+    const league = League.create({
+      id: 'league1',
+      name: 'Test League',
+      description: 'A test league',
+      ownerId: 'owner1',
+      socialLinks: {
+        discordUrl: 'https://discord.gg/test',
+      },
+    });
+
+    expect(league.socialLinks?.discordUrl).toBe('https://discord.gg/test');
+  });
+
+  it('should throw on invalid social links', () => {
+    expect(() => League.create({
+      id: 'league1',
+      name: 'Test League',
+      description: 'A test league',
+      ownerId: 'owner1',
+      socialLinks: {
+        discordUrl: 'invalid-url',
+      },
+    })).toThrow('Invalid Discord URL');
+  });
+
+  it('should update league', () => {
+    const league = League.create({
+      id: 'league1',
+      name: 'Test League',
+      description: 'A test league',
+      ownerId: 'owner1',
+    });
+
+    const updated = league.update({
+      name: 'Updated League',
+    });
+
+    expect(updated.name.toString()).toBe('Updated League');
+    expect(updated.id).toBe(league.id);
+  });
+});

core/racing/domain/entities/League.ts

@@ -4,9 +4,14 @@
  * Represents a league in the GridPilot platform.
  * Immutable entity with factory methods and domain validation.
  */
- 
-import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
 import type { IEntity } from '@core/shared/domain';
+import { LeagueId } from './LeagueId';
+import { LeagueName } from './LeagueName';
+import { LeagueDescription } from './LeagueDescription';
+import { LeagueOwnerId } from './LeagueOwnerId';
+import { LeagueCreatedAt } from './LeagueCreatedAt';
+import { LeagueSocialLinks } from './LeagueSocialLinks';
 
 /**
 * Stewarding decision mode for protests
@@ -21,41 +26,41 @@ export type StewardingDecisionMode =
 
 export interface StewardingSettings {
   /**
-   * How protest decisions are made
-   */
+    * How protest decisions are made
+    */
   decisionMode: StewardingDecisionMode;
   /**
-   * Number of votes required to uphold/reject a protest
-   * Used with steward_vote, member_vote, steward_veto, member_veto modes
-   */
+    * Number of votes required to uphold/reject a protest
+    * Used with steward_vote, member_vote, steward_veto, member_veto modes
+    */
   requiredVotes?: number;
   /**
-   * Whether to require a defense from the accused before deciding
-   */
+    * Whether to require a defense from the accused before deciding
+    */
   requireDefense?: boolean;
   /**
-   * Time limit (hours) for accused to submit defense
-   */
+    * Time limit (hours) for accused to submit defense
+    */
   defenseTimeLimit?: number;
   /**
-   * Time limit (hours) for voting to complete
-   */
+    * Time limit (hours) for voting to complete
+    */
   voteTimeLimit?: number;
   /**
-   * Time limit (hours) after race ends when protests can be filed
-   */
+    * Time limit (hours) after race ends when protests can be filed
+    */
   protestDeadlineHours?: number;
   /**
-   * Time limit (hours) after race ends when stewarding is closed (no more decisions)
-   */
+    * Time limit (hours) after race ends when stewarding is closed (no more decisions)
+    */
   stewardingClosesHours?: number;
   /**
-   * Whether to notify the accused when a protest is filed
-   */
+    * Whether to notify the accused when a protest is filed
+    */
   notifyAccusedOnProtest?: boolean;
   /**
-   * Whether to notify eligible voters when a vote is required
-   */
+    * Whether to notify eligible voters when a vote is required
+    */
   notifyOnVoteRequired?: boolean;
 }
 
@@ -65,38 +70,32 @@ export interface LeagueSettings {
   qualifyingFormat?: 'single-lap' | 'open';
   customPoints?: Record<number, number>;
   /**
-   * Maximum number of drivers allowed in the league.
-   * Used for simple capacity display on the website.
-   */
+    * Maximum number of drivers allowed in the league.
+    * Used for simple capacity display on the website.
+    */
   maxDrivers?: number;
   /**
-   * Stewarding settings for protest handling
-   */
+    * Stewarding settings for protest handling
+    */
   stewarding?: StewardingSettings;
 }
 
-export interface LeagueSocialLinks {
-  discordUrl?: string;
-  youtubeUrl?: string;
-  websiteUrl?: string;
-}
- 
-export class League implements IEntity<string> {
-  readonly id: string;
-  readonly name: string;
-  readonly description: string;
-  readonly ownerId: string;
+export class League implements IEntity<LeagueId> {
+  readonly id: LeagueId;
+  readonly name: LeagueName;
+  readonly description: LeagueDescription;
+  readonly ownerId: LeagueOwnerId;
   readonly settings: LeagueSettings;
-  readonly createdAt: Date;
+  readonly createdAt: LeagueCreatedAt;
   readonly socialLinks: LeagueSocialLinks | undefined;
 
   private constructor(props: {
-    id: string;
-    name: string;
-    description: string;
-    ownerId: string;
+    id: LeagueId;
+    name: LeagueName;
+    description: LeagueDescription;
+    ownerId: LeagueOwnerId;
     settings: LeagueSettings;
-    createdAt: Date;
+    createdAt: LeagueCreatedAt;
     socialLinks?: LeagueSocialLinks;
   }) {
     this.id = props.id;
@@ -118,9 +117,17 @@ export class League implements IEntity<string> {
     ownerId: string;
     settings?: Partial<LeagueSettings>;
     createdAt?: Date;
-    socialLinks?: LeagueSocialLinks;
+    socialLinks?: {
+      discordUrl?: string;
+      youtubeUrl?: string;
+      websiteUrl?: string;
+    };
   }): League {
-    this.validate(props);
+    const id = LeagueId.create(props.id);
+    const name = LeagueName.create(props.name);
+    const description = LeagueDescription.create(props.description);
+    const ownerId = LeagueOwnerId.create(props.ownerId);
+    const createdAt = LeagueCreatedAt.create(props.createdAt ?? new Date());
 
     const defaultStewardingSettings: StewardingSettings = {
       decisionMode: 'admin_only',
@@ -141,48 +148,19 @@ export class League implements IEntity<string> {
       stewarding: defaultStewardingSettings,
     };
 
-    const socialLinks = props.socialLinks;
+    const socialLinks = props.socialLinks ? LeagueSocialLinks.create(props.socialLinks) : undefined;
 
     return new League({
-      id: props.id,
-      name: props.name,
-      description: props.description,
-      ownerId: props.ownerId,
+      id,
+      name,
+      description,
+      ownerId,
       settings: { ...defaultSettings, ...props.settings },
-      createdAt: props.createdAt ?? new Date(),
+      createdAt,
       ...(socialLinks !== undefined ? { socialLinks } : {}),
     });
   }
 
-  /**
-   * Domain validation logic
-   */
-  private static validate(props: {
-    id: string;
-    name: string;
-    description: string;
-    ownerId: string;
-  }): void {
-    if (!props.id || props.id.trim().length === 0) {
-      throw new RacingDomainValidationError('League ID is required');
-    }
-
-    if (!props.name || props.name.trim().length === 0) {
-      throw new RacingDomainValidationError('League name is required');
-    }
-
-    if (props.name.length > 100) {
-      throw new RacingDomainValidationError('League name must be 100 characters or less');
-    }
-
-    if (!props.description || props.description.trim().length === 0) {
-      throw new RacingDomainValidationError('League description is required');
-    }
-
-    if (!props.ownerId || props.ownerId.trim().length === 0) {
-      throw new RacingDomainValidationError('League owner ID is required');
-    }
-  }
 
   /**
    * Create a copy with updated properties
@@ -192,20 +170,25 @@ export class League implements IEntity<string> {
     description: string;
     ownerId: string;
     settings: LeagueSettings;
-    socialLinks?: LeagueSocialLinks;
+    socialLinks?: {
+      discordUrl?: string;
+      youtubeUrl?: string;
+      websiteUrl?: string;
+    };
   }>): League {
+    const name = props.name ? LeagueName.create(props.name) : this.name;
+    const description = props.description ? LeagueDescription.create(props.description) : this.description;
+    const ownerId = props.ownerId ? LeagueOwnerId.create(props.ownerId) : this.ownerId;
+    const socialLinks = props.socialLinks ? LeagueSocialLinks.create(props.socialLinks) : this.socialLinks;
+
     return new League({
       id: this.id,
-      name: props.name ?? this.name,
-      description: props.description ?? this.description,
-      ownerId: props.ownerId ?? this.ownerId,
+      name,
+      description,
+      ownerId,
       settings: props.settings ?? this.settings,
       createdAt: this.createdAt,
-      ...(props.socialLinks !== undefined
-        ? { socialLinks: props.socialLinks }
-        : this.socialLinks !== undefined
-        ? { socialLinks: this.socialLinks }
-        : {}),
+      ...(socialLinks !== undefined ? { socialLinks } : {}),
     });
   }
 }

core/racing/domain/entities/LeagueCreatedAt.ts

@@ -0,0 +1,21 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LeagueCreatedAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): LeagueCreatedAt {
+    const now = new Date();
+    if (value > now) {
+      throw new RacingDomainValidationError('Created date cannot be in the future');
+    }
+    return new LeagueCreatedAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: LeagueCreatedAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/LeagueDescription.ts

@@ -0,0 +1,23 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LeagueDescription {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): LeagueDescription {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('League description cannot be empty');
+    }
+    if (value.length > 500) {
+      throw new RacingDomainValidationError('League description cannot exceed 500 characters');
+    }
+    return new LeagueDescription(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: LeagueDescription): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/LeagueId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LeagueId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): LeagueId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('League ID cannot be empty');
+    }
+    return new LeagueId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: LeagueId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/LeagueMembership.test.ts

@@ -0,0 +1,68 @@
+import { describe, it, expect } from 'vitest';
+import { LeagueMembership } from './LeagueMembership';
+
+describe('LeagueMembership', () => {
+  it('should create a league membership', () => {
+    const membership = LeagueMembership.create({
+      leagueId: 'league1',
+      driverId: 'driver1',
+      role: 'member',
+    });
+
+    expect(membership.id).toBe('league1:driver1');
+    expect(membership.leagueId.toString()).toBe('league1');
+    expect(membership.driverId.toString()).toBe('driver1');
+    expect(membership.role.toString()).toBe('member');
+    expect(membership.status.toString()).toBe('pending');
+  });
+
+  it('should create with custom id', () => {
+    const membership = LeagueMembership.create({
+      id: 'custom-id',
+      leagueId: 'league1',
+      driverId: 'driver1',
+      role: 'admin',
+      status: 'active',
+      joinedAt: new Date('2023-01-01'),
+    });
+
+    expect(membership.id).toBe('custom-id');
+    expect(membership.role.toString()).toBe('admin');
+    expect(membership.status.toString()).toBe('active');
+    expect(membership.joinedAt.toDate()).toEqual(new Date('2023-01-01'));
+  });
+
+  it('should throw on invalid leagueId', () => {
+    expect(() => LeagueMembership.create({
+      leagueId: '',
+      driverId: 'driver1',
+      role: 'member',
+    })).toThrow('League ID is required');
+  });
+
+  it('should throw on invalid driverId', () => {
+    expect(() => LeagueMembership.create({
+      leagueId: 'league1',
+      driverId: '',
+      role: 'member',
+    })).toThrow('Driver ID is required');
+  });
+
+  it('should throw on invalid role', () => {
+    expect(() => LeagueMembership.create({
+      leagueId: 'league1',
+      driverId: 'driver1',
+      role: '',
+    })).toThrow('Membership role is required');
+  });
+
+  it('should create with valid role', () => {
+    const membership = LeagueMembership.create({
+      leagueId: 'league1',
+      driverId: 'driver1',
+      role: 'owner',
+    });
+
+    expect(membership.role.toString()).toBe('owner');
+  });
+});

core/racing/domain/entities/LeagueMembership.ts

@@ -1,33 +1,42 @@
 /**
- * Domain Entity: LeagueMembership and JoinRequest
+ * Domain Entity: LeagueMembership
  *
- * Represents a driver's membership in a league and join requests.
+ * Represents a driver's membership in a league.
  */
 
 import type { IEntity } from '@core/shared/domain';
 import { RacingDomainValidationError } from '../errors/RacingDomainError';
-
-export type MembershipRole = 'owner' | 'admin' | 'steward' | 'member';
-export type MembershipStatus = 'active' | 'inactive' | 'pending';
+import { LeagueId } from './LeagueId';
+import { DriverId } from '../value-objects/DriverId';
+import { MembershipRole, MembershipRoleValue } from './MembershipRole';
+import { MembershipStatus, MembershipStatusValue } from './MembershipStatus';
+import { JoinedAt } from '../value-objects/JoinedAt';
 
 export interface LeagueMembershipProps {
   id?: string;
   leagueId: string;
   driverId: string;
-  role: MembershipRole;
-  status?: MembershipStatus;
+  role: string;
+  status?: string;
   joinedAt?: Date;
 }
 
 export class LeagueMembership implements IEntity<string> {
   readonly id: string;
-  readonly leagueId: string;
-  readonly driverId: string;
+  readonly leagueId: LeagueId;
+  readonly driverId: DriverId;
   readonly role: MembershipRole;
   readonly status: MembershipStatus;
-  readonly joinedAt: Date;
+  readonly joinedAt: JoinedAt;
 
-  private constructor(props: Required<LeagueMembershipProps>) {
+  private constructor(props: {
+    id: string;
+    leagueId: LeagueId;
+    driverId: DriverId;
+    role: MembershipRole;
+    status: MembershipStatus;
+    joinedAt: JoinedAt;
+  }) {
     this.id = props.id;
     this.leagueId = props.leagueId;
     this.driverId = props.driverId;
@@ -44,14 +53,17 @@ export class LeagueMembership implements IEntity<string> {
         ? props.id
         : `${props.leagueId}:${props.driverId}`;
 
-    const status = props.status ?? 'pending';
-    const joinedAt = props.joinedAt ?? new Date();
+    const leagueId = LeagueId.create(props.leagueId);
+    const driverId = DriverId.create(props.driverId);
+    const role = MembershipRole.create(props.role as MembershipRoleValue);
+    const status = MembershipStatus.create((props.status ?? 'pending') as MembershipStatusValue);
+    const joinedAt = JoinedAt.create(props.joinedAt ?? new Date());
 
     return new LeagueMembership({
       id,
-      leagueId: props.leagueId,
-      driverId: props.driverId,
-      role: props.role,
+      leagueId,
+      driverId,
+      role,
       status,
       joinedAt,
     });
@@ -70,12 +82,4 @@ export class LeagueMembership implements IEntity<string> {
       throw new RacingDomainValidationError('Membership role is required');
     }
   }
-}
-
-export interface JoinRequest {
-  id: string;
-  leagueId: string;
-  driverId: string;
-  requestedAt: Date;
-  message?: string;
 }

core/racing/domain/entities/LeagueName.ts

@@ -0,0 +1,23 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LeagueName {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): LeagueName {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('League name cannot be empty');
+    }
+    if (value.length > 100) {
+      throw new RacingDomainValidationError('League name cannot exceed 100 characters');
+    }
+    return new LeagueName(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: LeagueName): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/LeagueOwnerId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LeagueOwnerId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): LeagueOwnerId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('League owner ID cannot be empty');
+    }
+    return new LeagueOwnerId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: LeagueOwnerId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/LeagueScoringConfig.test.ts

@@ -0,0 +1,73 @@
+import { describe, it, expect } from 'vitest';
+import { LeagueScoringConfig } from './LeagueScoringConfig';
+import type { ChampionshipConfig } from '../types/ChampionshipConfig';
+import { PointsTable } from '../value-objects/PointsTable';
+
+const mockPointsTable = new PointsTable({ 1: 25, 2: 18, 3: 15 });
+
+const mockChampionshipConfig: ChampionshipConfig = {
+  id: 'champ1',
+  name: 'Championship 1',
+  type: 'driver',
+  sessionTypes: ['main'],
+  pointsTableBySessionType: {
+    practice: mockPointsTable,
+    qualifying: mockPointsTable,
+    q1: mockPointsTable,
+    q2: mockPointsTable,
+    q3: mockPointsTable,
+    sprint: mockPointsTable,
+    main: mockPointsTable,
+    timeTrial: mockPointsTable,
+  },
+  dropScorePolicy: { strategy: 'none' },
+};
+
+describe('LeagueScoringConfig', () => {
+  it('should create a league scoring config', () => {
+    const config = LeagueScoringConfig.create({
+      seasonId: 'season1',
+      championships: [mockChampionshipConfig],
+    });
+
+    expect(config.id.toString()).toBe('scoring-config-season1');
+    expect(config.seasonId.toString()).toBe('season1');
+    expect(config.scoringPresetId).toBeUndefined();
+    expect(config.championships).toEqual([mockChampionshipConfig]);
+  });
+
+  it('should create with custom id', () => {
+    const config = LeagueScoringConfig.create({
+      id: 'custom-id',
+      seasonId: 'season1',
+      scoringPresetId: 'preset1',
+      championships: [mockChampionshipConfig],
+    });
+
+    expect(config.id.toString()).toBe('custom-id');
+    expect(config.scoringPresetId?.toString()).toBe('preset1');
+  });
+
+  it('should throw on invalid seasonId', () => {
+    expect(() => LeagueScoringConfig.create({
+      seasonId: '',
+      championships: [mockChampionshipConfig],
+    })).toThrow('Season ID is required');
+  });
+
+  it('should throw on empty championships', () => {
+    expect(() => LeagueScoringConfig.create({
+      seasonId: 'season1',
+      championships: [],
+    })).toThrow('At least one championship is required');
+  });
+
+  it('should create with multiple championships', () => {
+    const config = LeagueScoringConfig.create({
+      seasonId: 'season1',
+      championships: [mockChampionshipConfig, { ...mockChampionshipConfig, id: 'champ2' }],
+    });
+
+    expect(config.championships).toHaveLength(2);
+  });
+});

core/racing/domain/entities/LeagueScoringConfig.ts

@@ -1,13 +1,73 @@
-import type { ChampionshipConfig } from '../types/ChampionshipConfig';
+/**
+ * Domain Entity: LeagueScoringConfig
+ *
+ * Represents the scoring configuration for a league season.
+ */
 
-export interface LeagueScoringConfig {
-  id: string;
+import type { IEntity } from '@core/shared/domain';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+import type { ChampionshipConfig } from '../types/ChampionshipConfig';
+import { SeasonId } from './SeasonId';
+import { ScoringPresetId } from './ScoringPresetId';
+import { LeagueScoringConfigId } from './LeagueScoringConfigId';
+
+export interface LeagueScoringConfigProps {
+  id?: string;
   seasonId: string;
-  /**
-   * Optional ID of the scoring preset this configuration was derived from.
-   * Used by application-layer read models to surface preset metadata such as
-   * name and drop policy summaries.
-   */
   scoringPresetId?: string;
   championships: ChampionshipConfig[];
+}
+
+export class LeagueScoringConfig implements IEntity<LeagueScoringConfigId> {
+  readonly id: LeagueScoringConfigId;
+  readonly seasonId: SeasonId;
+  readonly scoringPresetId: ScoringPresetId | undefined;
+  readonly championships: ChampionshipConfig[];
+
+  private constructor(props: {
+    id: LeagueScoringConfigId;
+    seasonId: SeasonId;
+    scoringPresetId?: ScoringPresetId;
+    championships: ChampionshipConfig[];
+  }) {
+    this.id = props.id;
+    this.seasonId = props.seasonId;
+    this.scoringPresetId = props.scoringPresetId;
+    this.championships = props.championships;
+  }
+
+  static create(props: LeagueScoringConfigProps): LeagueScoringConfig {
+    this.validate(props);
+
+    const idString = props.id && props.id.trim().length > 0 ? props.id : this.generateId(props.seasonId);
+    const id = LeagueScoringConfigId.create(idString);
+
+    const seasonId = SeasonId.create(props.seasonId);
+    const scoringPresetId = props.scoringPresetId ? ScoringPresetId.create(props.scoringPresetId) : undefined;
+
+    return new LeagueScoringConfig({
+      id,
+      seasonId,
+      ...(scoringPresetId ? { scoringPresetId } : {}),
+      championships: props.championships,
+    });
+  }
+
+  private static validate(props: LeagueScoringConfigProps): void {
+    if (!props.seasonId || props.seasonId.trim().length === 0) {
+      throw new RacingDomainValidationError('Season ID is required');
+    }
+
+    if (!props.championships || props.championships.length === 0) {
+      throw new RacingDomainValidationError('At least one championship is required');
+    }
+  }
+
+  private static generateId(seasonId: string): string {
+    return `scoring-config-${seasonId}`;
+  }
+
+  equals(other: LeagueScoringConfig): boolean {
+    return !!other && this.id.equals(other.id);
+  }
 }

core/racing/domain/entities/LeagueScoringConfigId.test.ts

@@ -0,0 +1,38 @@
+import { LeagueScoringConfigId } from './LeagueScoringConfigId';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('LeagueScoringConfigId', () => {
+  describe('create', () => {
+    it('should create a LeagueScoringConfigId with valid value', () => {
+      const id = LeagueScoringConfigId.create('scoring-config-123');
+      expect(id.toString()).toBe('scoring-config-123');
+    });
+
+    it('should trim whitespace', () => {
+      const id = LeagueScoringConfigId.create('  scoring-config-123  ');
+      expect(id.toString()).toBe('scoring-config-123');
+    });
+
+    it('should throw error for empty string', () => {
+      expect(() => LeagueScoringConfigId.create('')).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for whitespace only', () => {
+      expect(() => LeagueScoringConfigId.create('   ')).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('equals', () => {
+    it('should return true for equal ids', () => {
+      const id1 = LeagueScoringConfigId.create('scoring-config-123');
+      const id2 = LeagueScoringConfigId.create('scoring-config-123');
+      expect(id1.equals(id2)).toBe(true);
+    });
+
+    it('should return false for different ids', () => {
+      const id1 = LeagueScoringConfigId.create('scoring-config-123');
+      const id2 = LeagueScoringConfigId.create('scoring-config-456');
+      expect(id1.equals(id2)).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/LeagueScoringConfigId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LeagueScoringConfigId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): LeagueScoringConfigId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('League Scoring Config ID cannot be empty');
+    }
+    return new LeagueScoringConfigId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: LeagueScoringConfigId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/LeagueSocialLinks.ts

@@ -0,0 +1,52 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LeagueSocialLinks {
+  readonly discordUrl: string | undefined;
+  readonly youtubeUrl: string | undefined;
+  readonly websiteUrl: string | undefined;
+
+  private constructor(props: {
+    discordUrl?: string;
+    youtubeUrl?: string;
+    websiteUrl?: string;
+  }) {
+    this.discordUrl = props.discordUrl;
+    this.youtubeUrl = props.youtubeUrl;
+    this.websiteUrl = props.websiteUrl;
+  }
+
+  static create(props: {
+    discordUrl?: string;
+    youtubeUrl?: string;
+    websiteUrl?: string;
+  }): LeagueSocialLinks {
+    // Basic validation, e.g., if provided, must be valid URL
+    if (props.discordUrl && !this.isValidUrl(props.discordUrl)) {
+      throw new RacingDomainValidationError('Invalid Discord URL');
+    }
+    if (props.youtubeUrl && !this.isValidUrl(props.youtubeUrl)) {
+      throw new RacingDomainValidationError('Invalid YouTube URL');
+    }
+    if (props.websiteUrl && !this.isValidUrl(props.websiteUrl)) {
+      throw new RacingDomainValidationError('Invalid website URL');
+    }
+    return new LeagueSocialLinks(props);
+  }
+
+  private static isValidUrl(url: string): boolean {
+    try {
+      new URL(url);
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
+  equals(other: LeagueSocialLinks): boolean {
+    return (
+      this.discordUrl === other.discordUrl &&
+      this.youtubeUrl === other.youtubeUrl &&
+      this.websiteUrl === other.websiteUrl
+    );
+  }
+}

core/racing/domain/entities/LiveryTemplate.test.ts

@@ -0,0 +1,184 @@
+import { describe, it, expect } from 'vitest';
+import { LiveryTemplate } from './LiveryTemplate';
+import { LiveryDecal } from '../value-objects/LiveryDecal';
+
+describe('LiveryTemplate', () => {
+  const validProps = {
+    id: 'template1',
+    leagueId: 'league1',
+    seasonId: 'season1',
+    carId: 'car1',
+    baseImageUrl: 'https://example.com/image.png',
+  };
+
+  it('should create a livery template', () => {
+    const template = LiveryTemplate.create(validProps);
+    expect(template.id.toString()).toBe('template1');
+    expect(template.leagueId.toString()).toBe('league1');
+    expect(template.seasonId.toString()).toBe('season1');
+    expect(template.carId.toString()).toBe('car1');
+    expect(template.baseImageUrl.toString()).toBe('https://example.com/image.png');
+    expect(template.adminDecals).toEqual([]);
+  });
+
+  it('should throw on empty id', () => {
+    expect(() => LiveryTemplate.create({ ...validProps, id: '' })).toThrow('LiveryTemplate ID is required');
+  });
+
+  it('should throw on empty leagueId', () => {
+    expect(() => LiveryTemplate.create({ ...validProps, leagueId: '' })).toThrow('LiveryTemplate leagueId is required');
+  });
+
+  it('should throw on empty seasonId', () => {
+    expect(() => LiveryTemplate.create({ ...validProps, seasonId: '' })).toThrow('LiveryTemplate seasonId is required');
+  });
+
+  it('should throw on empty carId', () => {
+    expect(() => LiveryTemplate.create({ ...validProps, carId: '' })).toThrow('LiveryTemplate carId is required');
+  });
+
+  it('should throw on empty baseImageUrl', () => {
+    expect(() => LiveryTemplate.create({ ...validProps, baseImageUrl: '' })).toThrow('LiveryTemplate baseImageUrl is required');
+  });
+
+  it('should add a sponsor decal', () => {
+    const template = LiveryTemplate.create(validProps);
+    const decal = LiveryDecal.create({
+      id: 'decal1',
+      imageUrl: 'https://example.com/decal.png',
+      x: 0.5,
+      y: 0.5,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'sponsor',
+    });
+    const updated = template.addDecal(decal);
+    expect(updated.adminDecals).toHaveLength(1);
+    expect(updated.adminDecals[0]).toBe(decal);
+    expect(updated.updatedAt).toBeDefined();
+  });
+
+  it('should throw when adding non-sponsor decal', () => {
+    const template = LiveryTemplate.create(validProps);
+    const decal = LiveryDecal.create({
+      id: 'decal1',
+      imageUrl: 'https://example.com/decal.png',
+      x: 0.5,
+      y: 0.5,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'user',
+    });
+    expect(() => template.addDecal(decal)).toThrow('Only sponsor decals can be added to admin template');
+  });
+
+  it('should remove a decal', () => {
+    const decal = LiveryDecal.create({
+      id: 'decal1',
+      imageUrl: 'https://example.com/decal.png',
+      x: 0.5,
+      y: 0.5,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'sponsor',
+    });
+    const template = LiveryTemplate.create({ ...validProps, adminDecals: [decal] });
+    const updated = template.removeDecal('decal1');
+    expect(updated.adminDecals).toHaveLength(0);
+    expect(updated.updatedAt).toBeDefined();
+  });
+
+  it('should throw when removing non-existent decal', () => {
+    const template = LiveryTemplate.create(validProps);
+    expect(() => template.removeDecal('nonexistent')).toThrow('Decal not found in template');
+  });
+
+  it('should update a decal', () => {
+    const decal = LiveryDecal.create({
+      id: 'decal1',
+      imageUrl: 'https://example.com/decal.png',
+      x: 0.5,
+      y: 0.5,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'sponsor',
+    });
+    const template = LiveryTemplate.create({ ...validProps, adminDecals: [decal] });
+    const updatedDecal = LiveryDecal.create({
+      id: 'decal1',
+      imageUrl: 'https://example.com/decal.png',
+      x: 0.6,
+      y: 0.6,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'sponsor',
+    });
+    const updated = template.updateDecal('decal1', updatedDecal);
+    expect(updated.adminDecals[0]).toBe(updatedDecal);
+    expect(updated.updatedAt).toBeDefined();
+  });
+
+  it('should throw when updating non-existent decal', () => {
+    const template = LiveryTemplate.create(validProps);
+    const decal = LiveryDecal.create({
+      id: 'decal1',
+      imageUrl: 'https://example.com/decal.png',
+      x: 0.5,
+      y: 0.5,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'sponsor',
+    });
+    expect(() => template.updateDecal('nonexistent', decal)).toThrow('Decal not found in template');
+  });
+
+  it('should get sponsor decals', () => {
+    const sponsorDecal = LiveryDecal.create({
+      id: 'sponsor1',
+      imageUrl: 'https://example.com/sponsor.png',
+      x: 0.5,
+      y: 0.5,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'sponsor',
+    });
+    const userDecal = LiveryDecal.create({
+      id: 'user1',
+      imageUrl: 'https://example.com/user.png',
+      x: 0.5,
+      y: 0.5,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'user',
+    });
+    const template = LiveryTemplate.create({ ...validProps, adminDecals: [sponsorDecal, userDecal] });
+    const sponsors = template.getSponsorDecals();
+    expect(sponsors).toHaveLength(1);
+    expect(sponsors[0]).toBe(sponsorDecal);
+  });
+
+  it('should check if has sponsor decals', () => {
+    const sponsorDecal = LiveryDecal.create({
+      id: 'sponsor1',
+      imageUrl: 'https://example.com/sponsor.png',
+      x: 0.5,
+      y: 0.5,
+      width: 0.1,
+      height: 0.1,
+      zIndex: 1,
+      type: 'sponsor',
+    });
+    const templateWithSponsor = LiveryTemplate.create({ ...validProps, adminDecals: [sponsorDecal] });
+    const templateWithout = LiveryTemplate.create(validProps);
+    expect(templateWithSponsor.hasSponsorDecals()).toBe(true);
+    expect(templateWithout.hasSponsorDecals()).toBe(false);
+  });
+});

core/racing/domain/entities/LiveryTemplate.ts

@@ -6,55 +6,82 @@
  */
 
 import type { IEntity } from '@core/shared/domain';
-
+import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
 import type { LiveryDecal } from '../value-objects/LiveryDecal';
+import { LiveryTemplateId } from './LiveryTemplateId';
+import { LeagueId } from './LeagueId';
+import { SeasonId } from './SeasonId';
+import { CarId } from './CarId';
+import { ImageUrl } from './ImageUrl';
+import { LiveryTemplateCreatedAt } from './LiveryTemplateCreatedAt';
+import { LiveryTemplateUpdatedAt } from './LiveryTemplateUpdatedAt';
 
-export interface LiveryTemplateProps {
-  id: string;
-  leagueId: string;
-  seasonId: string;
-  carId: string;
-  baseImageUrl: string;
-  adminDecals: LiveryDecal[];
-  createdAt: Date;
-  updatedAt: Date | undefined;
-}
-
-export class LiveryTemplate implements IEntity<string> {
-  readonly id: string;
-  readonly leagueId: string;
-  readonly seasonId: string;
-  readonly carId: string;
-  readonly baseImageUrl: string;
+export class LiveryTemplate implements IEntity<LiveryTemplateId> {
+  readonly id: LiveryTemplateId;
+  readonly leagueId: LeagueId;
+  readonly seasonId: SeasonId;
+  readonly carId: CarId;
+  readonly baseImageUrl: ImageUrl;
   readonly adminDecals: LiveryDecal[];
-  readonly createdAt: Date;
-  readonly updatedAt: Date | undefined;
+  readonly createdAt: LiveryTemplateCreatedAt;
+  readonly updatedAt: LiveryTemplateUpdatedAt | undefined;
 
-  private constructor(props: LiveryTemplateProps) {
+  private constructor(props: {
+    id: LiveryTemplateId;
+    leagueId: LeagueId;
+    seasonId: SeasonId;
+    carId: CarId;
+    baseImageUrl: ImageUrl;
+    adminDecals: LiveryDecal[];
+    createdAt: LiveryTemplateCreatedAt;
+    updatedAt?: LiveryTemplateUpdatedAt;
+  }) {
     this.id = props.id;
     this.leagueId = props.leagueId;
     this.seasonId = props.seasonId;
     this.carId = props.carId;
     this.baseImageUrl = props.baseImageUrl;
     this.adminDecals = props.adminDecals;
-    this.createdAt = props.createdAt ?? new Date();
+    this.createdAt = props.createdAt;
     this.updatedAt = props.updatedAt;
   }
 
-  static create(props: Omit<LiveryTemplateProps, 'createdAt' | 'adminDecals'> & {
+  static create(props: {
+    id: string;
+    leagueId: string;
+    seasonId: string;
+    carId: string;
+    baseImageUrl: string;
     createdAt?: Date;
     adminDecals?: LiveryDecal[];
   }): LiveryTemplate {
     this.validate(props);
 
+    const id = LiveryTemplateId.create(props.id);
+    const leagueId = LeagueId.create(props.leagueId);
+    const seasonId = SeasonId.create(props.seasonId);
+    const carId = CarId.create(props.carId);
+    const baseImageUrl = ImageUrl.create(props.baseImageUrl);
+    const createdAt = LiveryTemplateCreatedAt.create(props.createdAt ?? new Date());
+
     return new LiveryTemplate({
-      ...props,
-      createdAt: props.createdAt ?? new Date(),
+      id,
+      leagueId,
+      seasonId,
+      carId,
+      baseImageUrl,
       adminDecals: props.adminDecals ?? [],
+      createdAt,
     });
   }
 
-  private static validate(props: Omit<LiveryTemplateProps, 'createdAt' | 'adminDecals'>): void {
+  private static validate(props: {
+    id: string;
+    leagueId: string;
+    seasonId: string;
+    carId: string;
+    baseImageUrl: string;
+  }): void {
     if (!props.id || props.id.trim().length === 0) {
       throw new RacingDomainValidationError('LiveryTemplate ID is required');
     }
@@ -87,7 +114,7 @@ export class LiveryTemplate implements IEntity<string> {
     return new LiveryTemplate({
       ...this,
       adminDecals: [...this.adminDecals, decal],
-      updatedAt: new Date(),
+      updatedAt: LiveryTemplateUpdatedAt.create(new Date()),
     });
   }
 
@@ -104,7 +131,7 @@ export class LiveryTemplate implements IEntity<string> {
     return new LiveryTemplate({
       ...this,
       adminDecals: updatedDecals,
-      updatedAt: new Date(),
+      updatedAt: LiveryTemplateUpdatedAt.create(new Date()),
     });
   }
 
@@ -113,7 +140,7 @@ export class LiveryTemplate implements IEntity<string> {
    */
   updateDecal(decalId: string, updatedDecal: LiveryDecal): LiveryTemplate {
     const index = this.adminDecals.findIndex(d => d.id === decalId);
- 
+
     if (index === -1) {
       throw new RacingDomainValidationError('Decal not found in template');
     }
@@ -124,7 +151,7 @@ export class LiveryTemplate implements IEntity<string> {
     return new LiveryTemplate({
       ...this,
       adminDecals: updatedDecals,
-      updatedAt: new Date(),
+      updatedAt: LiveryTemplateUpdatedAt.create(new Date()),
     });
   }
 

core/racing/domain/entities/LiveryTemplateCreatedAt.ts

@@ -0,0 +1,21 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LiveryTemplateCreatedAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): LiveryTemplateCreatedAt {
+    const now = new Date();
+    if (value > now) {
+      throw new RacingDomainValidationError('Created date cannot be in the future');
+    }
+    return new LiveryTemplateCreatedAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: LiveryTemplateCreatedAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/LiveryTemplateId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LiveryTemplateId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): LiveryTemplateId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('LiveryTemplate ID cannot be empty');
+    }
+    return new LiveryTemplateId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: LiveryTemplateId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/LiveryTemplateUpdatedAt.ts

@@ -0,0 +1,21 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class LiveryTemplateUpdatedAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): LiveryTemplateUpdatedAt {
+    const now = new Date();
+    if (value > now) {
+      throw new RacingDomainValidationError('Updated date cannot be in the future');
+    }
+    return new LiveryTemplateUpdatedAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: LiveryTemplateUpdatedAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/Manufacturer.ts

@@ -0,0 +1,23 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class Manufacturer {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): Manufacturer {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Manufacturer cannot be empty');
+    }
+    if (value.length > 50) {
+      throw new RacingDomainValidationError('Manufacturer cannot exceed 50 characters');
+    }
+    return new Manufacturer(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: Manufacturer): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/MembershipRole.ts

@@ -0,0 +1,22 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export type MembershipRoleValue = 'owner' | 'admin' | 'steward' | 'member';
+
+export class MembershipRole {
+  private constructor(private readonly value: MembershipRoleValue) {}
+
+  static create(value: MembershipRoleValue): MembershipRole {
+    if (!value) {
+      throw new RacingDomainValidationError('Membership role is required');
+    }
+    return new MembershipRole(value);
+  }
+
+  toString(): MembershipRoleValue {
+    return this.value;
+  }
+
+  equals(other: MembershipRole): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/MembershipStatus.ts

@@ -0,0 +1,22 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export type MembershipStatusValue = 'active' | 'inactive' | 'pending';
+
+export class MembershipStatus {
+  private constructor(private readonly value: MembershipStatusValue) {}
+
+  static create(value: MembershipStatusValue): MembershipStatus {
+    if (!value) {
+      throw new RacingDomainValidationError('Membership status is required');
+    }
+    return new MembershipStatus(value);
+  }
+
+  toString(): MembershipStatusValue {
+    return this.value;
+  }
+
+  equals(other: MembershipStatus): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/Penalty.ts

@@ -1,161 +0,0 @@
-/**
- * Domain Entity: Penalty
- *
- * Represents a penalty applied to a driver for an incident during a race.
- * Penalties can be applied as a result of an upheld protest or directly by stewards.
- */
- 
-import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
-import type { IEntity } from '@core/shared/domain';
-
-export type PenaltyType =
-  | 'time_penalty'        // Add time to race result (e.g., +5 seconds)
-  | 'grid_penalty'        // Grid position penalty for next race
-  | 'points_deduction'    // Deduct championship points
-  | 'disqualification'    // DSQ from the race
-  | 'warning'             // Official warning (no immediate consequence)
-  | 'license_points'      // Add penalty points to license (safety rating)
-  | 'probation'           // Conditional penalty
-  | 'fine'                // Monetary/points fine
-  | 'race_ban';           // Multi-race suspension
-
-export type PenaltyStatus = 'pending' | 'applied' | 'appealed' | 'overturned';
-
-export interface PenaltyProps {
-  id: string;
-  leagueId: string;
-  raceId: string;
-  /** The driver receiving the penalty */
-  driverId: string;
-  /** Type of penalty */
-  type: PenaltyType;
-  /** Value depends on type: seconds for time_penalty, positions for grid_penalty, points for points_deduction */
-  value?: number;
-  /** Reason for the penalty */
-  reason: string;
-  /** ID of the protest that led to this penalty (if applicable) */
-  protestId?: string;
-  /** ID of the steward who issued the penalty */
-  issuedBy: string;
-  /** Current status of the penalty */
-  status: PenaltyStatus;
-  /** Timestamp when the penalty was issued */
-  issuedAt: Date;
-  /** Timestamp when the penalty was applied to results */
-  appliedAt?: Date;
-  /** Notes about the penalty application */
-  notes?: string;
-}
-
-export class Penalty implements IEntity<string> {
-  private constructor(private readonly props: PenaltyProps) {}
-
-  static create(props: PenaltyProps): Penalty {
-    if (!props.id) throw new RacingDomainValidationError('Penalty ID is required');
-    if (!props.leagueId) throw new RacingDomainValidationError('League ID is required');
-    if (!props.raceId) throw new RacingDomainValidationError('Race ID is required');
-    if (!props.driverId) throw new RacingDomainValidationError('Driver ID is required');
-    if (!props.type) throw new RacingDomainValidationError('Penalty type is required');
-    if (!props.reason?.trim()) throw new RacingDomainValidationError('Penalty reason is required');
-    if (!props.issuedBy) throw new RacingDomainValidationError('Penalty must be issued by a steward');
-    
-    // Validate value based on type
-    if (['time_penalty', 'grid_penalty', 'points_deduction', 'license_points', 'fine', 'race_ban'].includes(props.type)) {
-      if (props.value === undefined || props.value <= 0) {
-        throw new RacingDomainValidationError(`${props.type} requires a positive value`);
-      }
-    }
-    
-    return new Penalty({
-      ...props,
-      status: props.status || 'pending',
-      issuedAt: props.issuedAt || new Date(),
-    });
-  }
-
-  get id(): string { return this.props.id; }
-  get leagueId(): string { return this.props.leagueId; }
-  get raceId(): string { return this.props.raceId; }
-  get driverId(): string { return this.props.driverId; }
-  get type(): PenaltyType { return this.props.type; }
-  get value(): number | undefined { return this.props.value; }
-  get reason(): string { return this.props.reason; }
-  get protestId(): string | undefined { return this.props.protestId; }
-  get issuedBy(): string { return this.props.issuedBy; }
-  get status(): PenaltyStatus { return this.props.status; }
-  get issuedAt(): Date { return this.props.issuedAt; }
-  get appliedAt(): Date | undefined { return this.props.appliedAt; }
-  get notes(): string | undefined { return this.props.notes; }
-
-  isPending(): boolean {
-    return this.props.status === 'pending';
-  }
-
-  isApplied(): boolean {
-    return this.props.status === 'applied';
-  }
-
-  /**
-   * Mark penalty as applied (after recalculating results)
-   */
-  markAsApplied(notes?: string): Penalty {
-    if (this.isApplied()) {
-      throw new RacingDomainInvariantError('Penalty is already applied');
-    }
-    if (this.props.status === 'overturned') {
-      throw new RacingDomainInvariantError('Cannot apply an overturned penalty');
-    }
-    const base: PenaltyProps = {
-      ...this.props,
-      status: 'applied',
-      appliedAt: new Date(),
-    };
-
-    const next: PenaltyProps =
-      notes !== undefined ? { ...base, notes } : base;
-
-    return Penalty.create(next);
-  }
-
-  /**
-   * Overturn the penalty (e.g., after successful appeal)
-   */
-  overturn(reason: string): Penalty {
-    if (this.props.status === 'overturned') {
-      throw new RacingDomainInvariantError('Penalty is already overturned');
-    }
-    return new Penalty({
-      ...this.props,
-      status: 'overturned',
-      notes: reason,
-    });
-  }
-
-  /**
-   * Get a human-readable description of the penalty
-   */
-  getDescription(): string {
-    switch (this.props.type) {
-      case 'time_penalty':
-        return `+${this.props.value}s time penalty`;
-      case 'grid_penalty':
-        return `${this.props.value} place grid penalty (next race)`;
-      case 'points_deduction':
-        return `${this.props.value} championship points deducted`;
-      case 'disqualification':
-        return 'Disqualified from race';
-      case 'warning':
-        return 'Official warning';
-      case 'license_points':
-        return `${this.props.value} license penalty points`;
-      case 'probation':
-        return 'Probationary period';
-      case 'fine':
-        return `${this.props.value} points fine`;
-      case 'race_ban':
-        return `${this.props.value} race suspension`;
-      default:
-        return 'Penalty';
-    }
-  }
-}

core/racing/domain/entities/Protest.test.ts

@@ -0,0 +1,226 @@
+import { Protest } from './Protest';
+import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
+
+describe('Protest', () => {
+  describe('create', () => {
+    it('should create a protest with required fields', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+      });
+
+      expect(protest.id).toBe('protest-1');
+      expect(protest.raceId).toBe('race-1');
+      expect(protest.protestingDriverId).toBe('driver-1');
+      expect(protest.accusedDriverId).toBe('driver-2');
+      expect(protest.incident.lap.toNumber()).toBe(5);
+      expect(protest.incident.description.toString()).toBe('Unsafe overtake');
+      expect(protest.status.toString()).toBe('pending');
+      expect(protest.filedAt).toBeInstanceOf(Date);
+    });
+
+    it('should create a protest with all fields', () => {
+      const filedAt = new Date('2023-01-01');
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake', timeInRace: 120.5 },
+        comment: 'He cut me off',
+        proofVideoUrl: 'https://example.com/video.mp4',
+        status: 'under_review',
+        reviewedBy: 'steward-1',
+        decisionNotes: 'Reviewed and upheld',
+        filedAt,
+        reviewedAt: new Date('2023-01-02'),
+        defense: { statement: 'It was a racing incident', videoUrl: 'https://example.com/defense.mp4', submittedAt: new Date('2023-01-01T12:00:00Z') },
+        defenseRequestedAt: new Date('2023-01-01T10:00:00Z'),
+        defenseRequestedBy: 'steward-1',
+      });
+
+      expect(protest.id).toBe('protest-1');
+      expect(protest.comment).toBe('He cut me off');
+      expect(protest.proofVideoUrl).toBe('https://example.com/video.mp4');
+      expect(protest.status.toString()).toBe('under_review');
+      expect(protest.reviewedBy).toBe('steward-1');
+      expect(protest.decisionNotes).toBe('Reviewed and upheld');
+      expect(protest.filedAt).toEqual(filedAt);
+      expect(protest.defense).toBeDefined();
+      expect(protest.defenseRequestedAt).toBeInstanceOf(Date);
+      expect(protest.defenseRequestedBy).toBe('steward-1');
+    });
+
+    it('should throw error for invalid id', () => {
+      expect(() => Protest.create({
+        id: '',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid lap', () => {
+      expect(() => Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: -1, description: 'Unsafe overtake' },
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for empty description', () => {
+      expect(() => Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: '' },
+      })).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('requestDefense', () => {
+    it('should request defense for pending protest', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+      });
+      const updated = protest.requestDefense('steward-1');
+      expect(updated.status.toString()).toBe('awaiting_defense');
+      expect(updated.defenseRequestedAt).toBeInstanceOf(Date);
+      expect(updated.defenseRequestedBy).toBe('steward-1');
+    });
+
+    it('should throw error if not pending', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+        status: 'upheld',
+      });
+      expect(() => protest.requestDefense('steward-1')).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('submitDefense', () => {
+    it('should submit defense for awaiting defense protest', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+        status: 'awaiting_defense',
+      });
+      const updated = protest.submitDefense('It was a racing incident');
+      expect(updated.status.toString()).toBe('under_review');
+      expect(updated.defense).toBeDefined();
+      if (updated.defense) {
+        expect(updated.defense.statement.toString()).toBe('It was a racing incident');
+      }
+    });
+
+    it('should throw error if not awaiting defense', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+      });
+      expect(() => protest.submitDefense('Statement')).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('uphold', () => {
+    it('should uphold pending protest', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+      });
+      const updated = protest.uphold('steward-1', 'Penalty applied');
+      expect(updated.status.toString()).toBe('upheld');
+      expect(updated.reviewedBy).toBe('steward-1');
+      expect(updated.decisionNotes).toBe('Penalty applied');
+      expect(updated.reviewedAt).toBeInstanceOf(Date);
+    });
+
+    it('should throw error if resolved', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+        status: 'upheld',
+      });
+      expect(() => protest.uphold('steward-1', 'Notes')).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('withdraw', () => {
+    it('should withdraw pending protest', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+      });
+      const updated = protest.withdraw();
+      expect(updated.status.toString()).toBe('withdrawn');
+      expect(updated.reviewedAt).toBeInstanceOf(Date);
+    });
+
+    it('should throw error if resolved', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+        status: 'upheld',
+      });
+      expect(() => protest.withdraw()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('isPending', () => {
+    it('should return true for pending status', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+      });
+      expect(protest.isPending()).toBe(true);
+    });
+
+    it('should return false for upheld status', () => {
+      const protest = Protest.create({
+        id: 'protest-1',
+        raceId: 'race-1',
+        protestingDriverId: 'driver-1',
+        accusedDriverId: 'driver-2',
+        incident: { lap: 5, description: 'Unsafe overtake' },
+        status: 'upheld',
+      });
+      expect(protest.isPending()).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/Protest.ts

@@ -13,107 +13,136 @@
  */
 import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
 import type { IEntity } from '@core/shared/domain';
-
-export type ProtestStatus = 'pending' | 'awaiting_defense' | 'under_review' | 'upheld' | 'dismissed' | 'withdrawn';
-
-export interface ProtestIncident {
-  /** Lap number where the incident occurred */
-  lap: number;
-  /** Time in the race (seconds from start, or timestamp) */
-  timeInRace?: number;
-  /** Brief description of the incident */
-  description: string;
-}
-
-export interface ProtestDefense {
-  /** The accused driver's statement/defense */
-  statement: string;
-  /** URL to defense video clip (optional) */
-  videoUrl?: string;
-  /** Timestamp when defense was submitted */
-  submittedAt: Date;
-}
+import { ProtestId } from './ProtestId';
+import { RaceId } from './RaceId';
+import { DriverId } from './DriverId';
+import { StewardId } from './StewardId';
+import { ProtestStatus } from './ProtestStatus';
+import { ProtestIncident } from './ProtestIncident';
+import { ProtestComment } from './ProtestComment';
+import { VideoUrl } from './VideoUrl';
+import { FiledAt } from './FiledAt';
+import { ReviewedAt } from './ReviewedAt';
+import { ProtestDefense } from './ProtestDefense';
+import { DefenseRequestedAt } from './DefenseRequestedAt';
+import { DecisionNotes } from './DecisionNotes';
 
 export interface ProtestProps {
-  id: string;
-  raceId: string;
+  id: ProtestId;
+  raceId: RaceId;
   /** The driver filing the protest */
-  protestingDriverId: string;
+  protestingDriverId: DriverId;
   /** The driver being protested against */
-  accusedDriverId: string;
+  accusedDriverId: DriverId;
   /** Details of the incident */
   incident: ProtestIncident;
   /** Optional comment/statement from the protesting driver */
-  comment?: string;
+  comment?: ProtestComment;
   /** URL to proof video clip */
-  proofVideoUrl?: string;
+  proofVideoUrl?: VideoUrl;
   /** Current status of the protest */
   status: ProtestStatus;
   /** ID of the steward/admin who reviewed (if any) */
-  reviewedBy?: string;
+  reviewedBy?: StewardId;
   /** Decision notes from the steward */
-  decisionNotes?: string;
+  decisionNotes?: DecisionNotes;
   /** Timestamp when the protest was filed */
-  filedAt: Date;
+  filedAt: FiledAt;
   /** Timestamp when the protest was reviewed */
-  reviewedAt?: Date;
+  reviewedAt?: ReviewedAt;
   /** Defense from the accused driver (if requested and submitted) */
   defense?: ProtestDefense;
   /** Timestamp when defense was requested */
-  defenseRequestedAt?: Date;
+  defenseRequestedAt?: DefenseRequestedAt;
   /** ID of the steward who requested defense */
-  defenseRequestedBy?: string;
+  defenseRequestedBy?: StewardId;
 }
 
 export class Protest implements IEntity<string> {
   private constructor(private readonly props: ProtestProps) {}
 
-  static create(props: ProtestProps): Protest {
-    if (!props.id) throw new RacingDomainValidationError('Protest ID is required');
-    if (!props.raceId) throw new RacingDomainValidationError('Race ID is required');
-    if (!props.protestingDriverId) throw new RacingDomainValidationError('Protesting driver ID is required');
-    if (!props.accusedDriverId) throw new RacingDomainValidationError('Accused driver ID is required');
-    if (!props.incident) throw new RacingDomainValidationError('Incident details are required');
-    if (props.incident.lap < 0) throw new RacingDomainValidationError('Lap number must be non-negative');
-    if (!props.incident.description?.trim()) throw new RacingDomainValidationError('Incident description is required');
-    
+  static create(props: {
+    id: string;
+    raceId: string;
+    protestingDriverId: string;
+    accusedDriverId: string;
+    incident: { lap: number; description: string; timeInRace?: number };
+    comment?: string;
+    proofVideoUrl?: string;
+    status?: string;
+    reviewedBy?: string;
+    decisionNotes?: string;
+    filedAt?: Date;
+    reviewedAt?: Date;
+    defense?: { statement: string; videoUrl?: string; submittedAt: Date };
+    defenseRequestedAt?: Date;
+    defenseRequestedBy?: string;
+  }): Protest {
+    const id = ProtestId.create(props.id);
+    const raceId = RaceId.create(props.raceId);
+    const protestingDriverId = DriverId.create(props.protestingDriverId);
+    const accusedDriverId = DriverId.create(props.accusedDriverId);
+    const incident = ProtestIncident.create(props.incident.lap, props.incident.description, props.incident.timeInRace);
+    const comment = props.comment ? ProtestComment.create(props.comment) : undefined;
+    const proofVideoUrl = props.proofVideoUrl ? VideoUrl.create(props.proofVideoUrl) : undefined;
+    const status = ProtestStatus.create(props.status || 'pending');
+    const reviewedBy = props.reviewedBy ? StewardId.create(props.reviewedBy) : undefined;
+    const decisionNotes = props.decisionNotes ? DecisionNotes.create(props.decisionNotes) : undefined;
+    const filedAt = FiledAt.create(props.filedAt || new Date());
+    const reviewedAt = props.reviewedAt ? ReviewedAt.create(props.reviewedAt) : undefined;
+    const defense = props.defense ? ProtestDefense.create(props.defense.statement, props.defense.submittedAt, props.defense.videoUrl) : undefined;
+    const defenseRequestedAt = props.defenseRequestedAt ? DefenseRequestedAt.create(props.defenseRequestedAt) : undefined;
+    const defenseRequestedBy = props.defenseRequestedBy ? StewardId.create(props.defenseRequestedBy) : undefined;
+
     return new Protest({
-      ...props,
-      status: props.status || 'pending',
-      filedAt: props.filedAt || new Date(),
+      id,
+      raceId,
+      protestingDriverId,
+      accusedDriverId,
+      incident,
+      comment,
+      proofVideoUrl,
+      status,
+      reviewedBy,
+      decisionNotes,
+      filedAt,
+      reviewedAt,
+      defense,
+      defenseRequestedAt,
+      defenseRequestedBy,
     });
   }
 
-  get id(): string { return this.props.id; }
-  get raceId(): string { return this.props.raceId; }
-  get protestingDriverId(): string { return this.props.protestingDriverId; }
-  get accusedDriverId(): string { return this.props.accusedDriverId; }
-  get incident(): ProtestIncident { return { ...this.props.incident }; }
-  get comment(): string | undefined { return this.props.comment; }
-  get proofVideoUrl(): string | undefined { return this.props.proofVideoUrl; }
+  get id(): string { return this.props.id.toString(); }
+  get raceId(): string { return this.props.raceId.toString(); }
+  get protestingDriverId(): string { return this.props.protestingDriverId.toString(); }
+  get accusedDriverId(): string { return this.props.accusedDriverId.toString(); }
+  get incident(): ProtestIncident { return this.props.incident; }
+  get comment(): string | undefined { return this.props.comment?.toString(); }
+  get proofVideoUrl(): string | undefined { return this.props.proofVideoUrl?.toString(); }
   get status(): ProtestStatus { return this.props.status; }
-  get reviewedBy(): string | undefined { return this.props.reviewedBy; }
-  get decisionNotes(): string | undefined { return this.props.decisionNotes; }
-  get filedAt(): Date { return this.props.filedAt; }
-  get reviewedAt(): Date | undefined { return this.props.reviewedAt; }
-  get defense(): ProtestDefense | undefined { return this.props.defense ? { ...this.props.defense } : undefined; }
-  get defenseRequestedAt(): Date | undefined { return this.props.defenseRequestedAt; }
-  get defenseRequestedBy(): string | undefined { return this.props.defenseRequestedBy; }
+  get reviewedBy(): string | undefined { return this.props.reviewedBy?.toString(); }
+  get decisionNotes(): string | undefined { return this.props.decisionNotes?.toString(); }
+  get filedAt(): Date { return this.props.filedAt.toDate(); }
+  get reviewedAt(): Date | undefined { return this.props.reviewedAt?.toDate(); }
+  get defense(): ProtestDefense | undefined { return this.props.defense; }
+  get defenseRequestedAt(): Date | undefined { return this.props.defenseRequestedAt?.toDate(); }
+  get defenseRequestedBy(): string | undefined { return this.props.defenseRequestedBy?.toString(); }
 
   isPending(): boolean {
-    return this.props.status === 'pending';
+    return this.props.status.toString() === 'pending';
   }
 
   isAwaitingDefense(): boolean {
-    return this.props.status === 'awaiting_defense';
+    return this.props.status.toString() === 'awaiting_defense';
   }
 
   isUnderReview(): boolean {
-    return this.props.status === 'under_review';
+    return this.props.status.toString() === 'under_review';
   }
 
   isResolved(): boolean {
-    return ['upheld', 'dismissed', 'withdrawn'].includes(this.props.status);
+    return ['upheld', 'dismissed', 'withdrawn'].includes(this.props.status.toString());
   }
 
   hasDefense(): boolean {
@@ -137,9 +166,9 @@ export class Protest implements IEntity<string> {
     }
     return new Protest({
       ...this.props,
-      status: 'awaiting_defense',
-      defenseRequestedAt: new Date(),
-      defenseRequestedBy: stewardId,
+      status: ProtestStatus.create('awaiting_defense'),
+      defenseRequestedAt: DefenseRequestedAt.create(new Date()),
+      defenseRequestedBy: StewardId.create(stewardId),
     });
   }
 
@@ -153,18 +182,12 @@ export class Protest implements IEntity<string> {
     if (!statement?.trim()) {
       throw new RacingDomainValidationError('Defense statement is required');
     }
-    const defenseBase: ProtestDefense = {
-      statement: statement.trim(),
-      submittedAt: new Date(),
-    };
-
-    const nextDefense: ProtestDefense =
-      videoUrl !== undefined ? { ...defenseBase, videoUrl } : defenseBase;
+    const defense = ProtestDefense.create(statement.trim(), new Date(), videoUrl);
 
     return new Protest({
       ...this.props,
-      status: 'under_review',
-      defense: nextDefense,
+      status: ProtestStatus.create('under_review'),
+      defense,
     });
   }
 
@@ -177,8 +200,8 @@ export class Protest implements IEntity<string> {
     }
     return new Protest({
       ...this.props,
-      status: 'under_review',
-      reviewedBy: stewardId,
+      status: ProtestStatus.create('under_review'),
+      reviewedBy: StewardId.create(stewardId),
     });
   }
 
@@ -191,10 +214,10 @@ export class Protest implements IEntity<string> {
     }
     return new Protest({
       ...this.props,
-      status: 'upheld',
-      reviewedBy: stewardId,
-      decisionNotes,
-      reviewedAt: new Date(),
+      status: ProtestStatus.create('upheld'),
+      reviewedBy: StewardId.create(stewardId),
+      decisionNotes: DecisionNotes.create(decisionNotes),
+      reviewedAt: ReviewedAt.create(new Date()),
     });
   }
 
@@ -207,10 +230,10 @@ export class Protest implements IEntity<string> {
     }
     return new Protest({
       ...this.props,
-      status: 'dismissed',
-      reviewedBy: stewardId,
-      decisionNotes,
-      reviewedAt: new Date(),
+      status: ProtestStatus.create('dismissed'),
+      reviewedBy: StewardId.create(stewardId),
+      decisionNotes: DecisionNotes.create(decisionNotes),
+      reviewedAt: ReviewedAt.create(new Date()),
     });
   }
 
@@ -223,8 +246,8 @@ export class Protest implements IEntity<string> {
     }
     return new Protest({
       ...this.props,
-      status: 'withdrawn',
-      reviewedAt: new Date(),
+      status: ProtestStatus.create('withdrawn'),
+      reviewedAt: ReviewedAt.create(new Date()),
     });
   }
 }

core/racing/domain/entities/ProtestComment.ts

@@ -0,0 +1,21 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class ProtestComment {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): ProtestComment {
+    const trimmed = value.trim();
+    if (!trimmed) {
+      throw new RacingDomainValidationError('Protest comment cannot be empty');
+    }
+    return new ProtestComment(trimmed);
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: ProtestComment): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/ProtestDefense.ts

@@ -0,0 +1,40 @@
+import { DefenseStatement } from './DefenseStatement';
+import { VideoUrl } from './VideoUrl';
+import { SubmittedAt } from './SubmittedAt';
+
+export class ProtestDefense {
+  private constructor(
+    private readonly _statement: DefenseStatement,
+    private readonly _videoUrl: VideoUrl | undefined,
+    private readonly _submittedAt: SubmittedAt
+  ) {}
+
+  static create(statement: string, submittedAt: Date, videoUrl?: string): ProtestDefense {
+    const stmt = DefenseStatement.create(statement);
+    const video = videoUrl !== undefined ? VideoUrl.create(videoUrl) : undefined;
+    const submitted = SubmittedAt.create(submittedAt);
+    return new ProtestDefense(stmt, video, submitted);
+  }
+
+  get statement(): DefenseStatement {
+    return this._statement;
+  }
+
+  get videoUrl(): VideoUrl | undefined {
+    return this._videoUrl;
+  }
+
+  get submittedAt(): SubmittedAt {
+    return this._submittedAt;
+  }
+
+  equals(other: ProtestDefense): boolean {
+    const videoEqual = this._videoUrl === undefined && other._videoUrl === undefined ||
+      (this._videoUrl !== undefined && other._videoUrl !== undefined && this._videoUrl.equals(other._videoUrl));
+    return (
+      this._statement.equals(other._statement) &&
+      videoEqual &&
+      this._submittedAt.equals(other._submittedAt)
+    );
+  }
+}

core/racing/domain/entities/ProtestId.test.ts

@@ -0,0 +1,38 @@
+import { ProtestId } from './ProtestId';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('ProtestId', () => {
+  describe('create', () => {
+    it('should create a ProtestId with valid value', () => {
+      const id = ProtestId.create('protest-123');
+      expect(id.toString()).toBe('protest-123');
+    });
+
+    it('should trim whitespace', () => {
+      const id = ProtestId.create('  protest-123  ');
+      expect(id.toString()).toBe('protest-123');
+    });
+
+    it('should throw error for empty string', () => {
+      expect(() => ProtestId.create('')).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for whitespace only', () => {
+      expect(() => ProtestId.create('   ')).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('equals', () => {
+    it('should return true for equal ids', () => {
+      const id1 = ProtestId.create('protest-123');
+      const id2 = ProtestId.create('protest-123');
+      expect(id1.equals(id2)).toBe(true);
+    });
+
+    it('should return false for different ids', () => {
+      const id1 = ProtestId.create('protest-123');
+      const id2 = ProtestId.create('protest-456');
+      expect(id1.equals(id2)).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/ProtestId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class ProtestId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): ProtestId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Protest ID cannot be empty');
+    }
+    return new ProtestId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: ProtestId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/ProtestIncident.ts

@@ -0,0 +1,40 @@
+import { LapNumber } from './LapNumber';
+import { TimeInRace } from './TimeInRace';
+import { IncidentDescription } from './IncidentDescription';
+
+export class ProtestIncident {
+  private constructor(
+    private readonly _lap: LapNumber,
+    private readonly _timeInRace: TimeInRace | undefined,
+    private readonly _description: IncidentDescription
+  ) {}
+
+  static create(lap: number, description: string, timeInRace?: number): ProtestIncident {
+    const lapNumber = LapNumber.create(lap);
+    const time = timeInRace !== undefined ? TimeInRace.create(timeInRace) : undefined;
+    const desc = IncidentDescription.create(description);
+    return new ProtestIncident(lapNumber, time, desc);
+  }
+
+  get lap(): LapNumber {
+    return this._lap;
+  }
+
+  get timeInRace(): TimeInRace | undefined {
+    return this._timeInRace;
+  }
+
+  get description(): IncidentDescription {
+    return this._description;
+  }
+
+  equals(other: ProtestIncident): boolean {
+    const timeEqual = this._timeInRace === undefined && other._timeInRace === undefined ||
+      (this._timeInRace !== undefined && other._timeInRace !== undefined && this._timeInRace.equals(other._timeInRace));
+    return (
+      this._lap.equals(other._lap) &&
+      timeEqual &&
+      this._description.equals(other._description)
+    );
+  }
+}

core/racing/domain/entities/ProtestStatus.ts

@@ -0,0 +1,25 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export type ProtestStatusValue = 'pending' | 'awaiting_defense' | 'under_review' | 'upheld' | 'dismissed' | 'withdrawn';
+
+export class ProtestStatus {
+  private constructor(private readonly value: ProtestStatusValue) {}
+
+  static create(value: string): ProtestStatus {
+    const validStatuses: ProtestStatusValue[] = ['pending', 'awaiting_defense', 'under_review', 'upheld', 'dismissed', 'withdrawn'];
+
+    if (!validStatuses.includes(value as ProtestStatusValue)) {
+      throw new RacingDomainValidationError(`Invalid protest status: ${value}`);
+    }
+
+    return new ProtestStatus(value as ProtestStatusValue);
+  }
+
+  toString(): ProtestStatusValue {
+    return this.value;
+  }
+
+  equals(other: ProtestStatus): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/Race.test.ts

@@ -0,0 +1,340 @@
+import { Race } from './Race';
+import { SessionType } from '../value-objects/SessionType';
+import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
+
+describe('Race', () => {
+  describe('create', () => {
+    it('should create a race with required fields', () => {
+      const scheduledAt = new Date('2023-01-01T10:00:00Z');
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+      });
+
+      expect(race.id).toBe('race-1');
+      expect(race.leagueId).toBe('league-1');
+      expect(race.scheduledAt).toEqual(scheduledAt);
+      expect(race.track).toBe('Monza');
+      expect(race.car).toBe('Ferrari SF21');
+      expect(race.sessionType).toEqual(SessionType.main());
+      expect(race.status).toBe('scheduled');
+      expect(race.trackId).toBeUndefined();
+      expect(race.carId).toBeUndefined();
+      expect(race.strengthOfField).toBeUndefined();
+      expect(race.registeredCount).toBeUndefined();
+      expect(race.maxParticipants).toBeUndefined();
+    });
+
+    it('should create a race with all fields', () => {
+      const scheduledAt = new Date('2023-01-01T10:00:00Z');
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        trackId: 'track-1',
+        car: 'Ferrari SF21',
+        carId: 'car-1',
+        sessionType: SessionType.qualifying(),
+        status: 'running',
+        strengthOfField: 1500,
+        registeredCount: 20,
+        maxParticipants: 24,
+      });
+
+      expect(race.id).toBe('race-1');
+      expect(race.leagueId).toBe('league-1');
+      expect(race.scheduledAt).toEqual(scheduledAt);
+      expect(race.track).toBe('Monza');
+      expect(race.trackId).toBe('track-1');
+      expect(race.car).toBe('Ferrari SF21');
+      expect(race.carId).toBe('car-1');
+      expect(race.sessionType).toEqual(SessionType.qualifying());
+      expect(race.status).toBe('running');
+      expect(race.strengthOfField).toBe(1500);
+      expect(race.registeredCount).toBe(20);
+      expect(race.maxParticipants).toBe(24);
+    });
+
+    it('should throw error for invalid id', () => {
+      const scheduledAt = new Date();
+      expect(() => Race.create({
+        id: '',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid leagueId', () => {
+      const scheduledAt = new Date();
+      expect(() => Race.create({
+        id: 'race-1',
+        leagueId: '',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid scheduledAt', () => {
+      expect(() => Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt: 'invalid' as unknown as Date,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid track', () => {
+      const scheduledAt = new Date();
+      expect(() => Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: '',
+        car: 'Ferrari SF21',
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid car', () => {
+      const scheduledAt = new Date();
+      expect(() => Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: '',
+      })).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('start', () => {
+    it('should start a scheduled race', () => {
+      const scheduledAt = new Date(Date.now() + 3600000); // future
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'scheduled',
+      });
+      const started = race.start();
+      expect(started.status).toBe('running');
+    });
+
+    it('should throw error if not scheduled', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'running',
+      });
+      expect(() => race.start()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('complete', () => {
+    it('should complete a running race', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'running',
+      });
+      const completed = race.complete();
+      expect(completed.status).toBe('completed');
+    });
+
+    it('should throw error if already completed', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'completed',
+      });
+      expect(() => race.complete()).toThrow(RacingDomainInvariantError);
+    });
+
+    it('should throw error if cancelled', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'cancelled',
+      });
+      expect(() => race.complete()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('cancel', () => {
+    it('should cancel a scheduled race', () => {
+      const scheduledAt = new Date(Date.now() + 3600000);
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'scheduled',
+      });
+      const cancelled = race.cancel();
+      expect(cancelled.status).toBe('cancelled');
+    });
+
+    it('should throw error if completed', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'completed',
+      });
+      expect(() => race.cancel()).toThrow(RacingDomainInvariantError);
+    });
+
+    it('should throw error if already cancelled', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'cancelled',
+      });
+      expect(() => race.cancel()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('updateField', () => {
+    it('should update strengthOfField and registeredCount', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+      });
+      const updated = race.updateField(1600, 22);
+      expect(updated.strengthOfField).toBe(1600);
+      expect(updated.registeredCount).toBe(22);
+    });
+  });
+
+  describe('isPast', () => {
+    it('should return true for past race', () => {
+      const scheduledAt = new Date(Date.now() - 3600000); // past
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+      });
+      expect(race.isPast()).toBe(true);
+    });
+
+    it('should return false for future race', () => {
+      const scheduledAt = new Date(Date.now() + 3600000); // future
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+      });
+      expect(race.isPast()).toBe(false);
+    });
+  });
+
+  describe('isUpcoming', () => {
+    it('should return true for scheduled future race', () => {
+      const scheduledAt = new Date(Date.now() + 3600000); // future
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'scheduled',
+      });
+      expect(race.isUpcoming()).toBe(true);
+    });
+
+    it('should return false for past scheduled race', () => {
+      const scheduledAt = new Date(Date.now() - 3600000); // past
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'scheduled',
+      });
+      expect(race.isUpcoming()).toBe(false);
+    });
+
+    it('should return false for running race', () => {
+      const scheduledAt = new Date(Date.now() + 3600000);
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'running',
+      });
+      expect(race.isUpcoming()).toBe(false);
+    });
+  });
+
+  describe('isLive', () => {
+    it('should return true for running race', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'running',
+      });
+      expect(race.isLive()).toBe(true);
+    });
+
+    it('should return false for scheduled race', () => {
+      const scheduledAt = new Date();
+      const race = Race.create({
+        id: 'race-1',
+        leagueId: 'league-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        status: 'scheduled',
+      });
+      expect(race.isLive()).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/RaceEvent.test.ts

@@ -0,0 +1,578 @@
+import { RaceEvent } from './RaceEvent';
+import { Session } from './Session';
+import { SessionType } from '../value-objects/SessionType';
+import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
+
+describe('RaceEvent', () => {
+  const createMockSession = (overrides: Partial<{
+    id: string;
+    raceEventId: string;
+    sessionType: SessionType;
+    status: 'scheduled' | 'running' | 'completed' | 'cancelled';
+    scheduledAt: Date;
+  }> = {}): Session => {
+    return Session.create({
+      id: overrides.id ?? 'session-1',
+      raceEventId: overrides.raceEventId ?? 'race-event-1',
+      scheduledAt: overrides.scheduledAt ?? new Date('2023-01-01T10:00:00Z'),
+      track: 'Monza',
+      car: 'Ferrari SF21',
+      sessionType: overrides.sessionType ?? SessionType.main(),
+      status: overrides.status ?? 'scheduled',
+    });
+  };
+
+  describe('create', () => {
+    it('should create a race event with required fields', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+
+      expect(raceEvent.id).toBe('race-event-1');
+      expect(raceEvent.seasonId).toBe('season-1');
+      expect(raceEvent.leagueId).toBe('league-1');
+      expect(raceEvent.name).toBe('Monza Grand Prix');
+      expect(raceEvent.sessions).toHaveLength(1);
+      expect(raceEvent.status).toBe('scheduled');
+      expect(raceEvent.stewardingClosesAt).toBeUndefined();
+    });
+
+    it('should create a race event with all fields', () => {
+      const sessions = [
+        createMockSession({ id: 'session-1', sessionType: SessionType.practice() }),
+        createMockSession({ id: 'session-2', sessionType: SessionType.qualifying() }),
+        createMockSession({ id: 'session-3', sessionType: SessionType.main() }),
+      ];
+      const stewardingClosesAt = new Date('2023-01-02T10:00:00Z');
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'in_progress',
+        stewardingClosesAt,
+      });
+
+      expect(raceEvent.id).toBe('race-event-1');
+      expect(raceEvent.seasonId).toBe('season-1');
+      expect(raceEvent.leagueId).toBe('league-1');
+      expect(raceEvent.name).toBe('Monza Grand Prix');
+      expect(raceEvent.sessions).toHaveLength(3);
+      expect(raceEvent.status).toBe('in_progress');
+      expect(raceEvent.stewardingClosesAt).toEqual(stewardingClosesAt);
+    });
+
+    it('should throw error for invalid id', () => {
+      const sessions = [createMockSession()];
+      expect(() => RaceEvent.create({
+        id: '',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid seasonId', () => {
+      const sessions = [createMockSession()];
+      expect(() => RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: '',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid leagueId', () => {
+      const sessions = [createMockSession()];
+      expect(() => RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: '',
+        name: 'Monza Grand Prix',
+        sessions,
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid name', () => {
+      const sessions = [createMockSession()];
+      expect(() => RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: '',
+        sessions,
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for no sessions', () => {
+      expect(() => RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions: [],
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for sessions not belonging to race event', () => {
+      const sessions = [createMockSession({ raceEventId: 'other-race-event' })];
+      expect(() => RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for duplicate session types', () => {
+      const sessions = [
+        createMockSession({ id: 'session-1', sessionType: SessionType.main() }),
+        createMockSession({ id: 'session-2', sessionType: SessionType.main() }),
+      ];
+      expect(() => RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for no main race session', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.practice() })];
+      expect(() => RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      })).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('start', () => {
+    it('should start a scheduled race event', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'scheduled',
+      });
+      const started = raceEvent.start();
+      expect(started.status).toBe('in_progress');
+    });
+
+    it('should throw error if not scheduled', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'in_progress',
+      });
+      expect(() => raceEvent.start()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('completeMainRace', () => {
+    it('should complete main race and move to awaiting_stewarding', () => {
+      const mainSession = createMockSession({ sessionType: SessionType.main(), status: 'completed' });
+      const sessions = [mainSession];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'in_progress',
+      });
+      const completed = raceEvent.completeMainRace();
+      expect(completed.status).toBe('awaiting_stewarding');
+    });
+
+    it('should throw error if not in progress', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'scheduled',
+      });
+      expect(() => raceEvent.completeMainRace()).toThrow(RacingDomainInvariantError);
+    });
+
+    it('should throw error if main race not completed', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main(), status: 'running' })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'in_progress',
+      });
+      expect(() => raceEvent.completeMainRace()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('closeStewarding', () => {
+    it('should close stewarding and finalize race event', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'awaiting_stewarding',
+      });
+      const closed = raceEvent.closeStewarding();
+      expect(closed.status).toBe('closed');
+    });
+
+    it('should throw error if not awaiting stewarding', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'in_progress',
+      });
+      expect(() => raceEvent.closeStewarding()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('cancel', () => {
+    it('should cancel a scheduled race event', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'scheduled',
+      });
+      const cancelled = raceEvent.cancel();
+      expect(cancelled.status).toBe('cancelled');
+    });
+
+    it('should return same instance if already cancelled', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'cancelled',
+      });
+      const cancelled = raceEvent.cancel();
+      expect(cancelled).toBe(raceEvent);
+    });
+
+    it('should throw error if closed', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'closed',
+      });
+      expect(() => raceEvent.cancel()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('getMainRaceSession', () => {
+    it('should return the main race session', () => {
+      const mainSession = createMockSession({ sessionType: SessionType.main() });
+      const practiceSession = createMockSession({ id: 'session-2', sessionType: SessionType.practice() });
+      const sessions = [practiceSession, mainSession];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      expect(raceEvent.getMainRaceSession()).toBe(mainSession);
+    });
+  });
+
+  describe('getSessionsByType', () => {
+    it('should return sessions of specific type', () => {
+      const practice = createMockSession({ id: 'p1', sessionType: SessionType.practice() });
+      const qualifying = createMockSession({ id: 'q1', sessionType: SessionType.qualifying() });
+      const main = createMockSession({ id: 'm1', sessionType: SessionType.main() });
+      const sessions = [practice, qualifying, main];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      const practices = raceEvent.getSessionsByType(SessionType.practice());
+      expect(practices).toHaveLength(1);
+      expect(practices).toContain(practice);
+    });
+  });
+
+  describe('getCompletedSessions', () => {
+    it('should return only completed sessions', () => {
+      const completed1 = createMockSession({ id: 'c1', sessionType: SessionType.practice(), status: 'completed' });
+      const completed2 = createMockSession({ id: 'c2', sessionType: SessionType.qualifying(), status: 'completed' });
+      const running = createMockSession({ id: 'r1', sessionType: SessionType.main(), status: 'running' });
+      const sessions = [completed1, running, completed2];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      const completed = raceEvent.getCompletedSessions();
+      expect(completed).toHaveLength(2);
+      expect(completed).toContain(completed1);
+      expect(completed).toContain(completed2);
+    });
+  });
+
+  describe('areAllSessionsCompleted', () => {
+    it('should return true if all sessions completed', () => {
+      const sessions = [
+        createMockSession({ id: 's1', sessionType: SessionType.practice(), status: 'completed' }),
+        createMockSession({ id: 's2', sessionType: SessionType.main(), status: 'completed' }),
+      ];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      expect(raceEvent.areAllSessionsCompleted()).toBe(true);
+    });
+
+    it('should return false if not all sessions completed', () => {
+      const sessions = [
+        createMockSession({ id: 's1', sessionType: SessionType.practice(), status: 'completed' }),
+        createMockSession({ id: 's2', sessionType: SessionType.main(), status: 'running' }),
+      ];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      expect(raceEvent.areAllSessionsCompleted()).toBe(false);
+    });
+  });
+
+  describe('isMainRaceCompleted', () => {
+    it('should return true if main race is completed', () => {
+      const mainSession = createMockSession({ sessionType: SessionType.main(), status: 'completed' });
+      const sessions = [mainSession];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      expect(raceEvent.isMainRaceCompleted()).toBe(true);
+    });
+
+    it('should return false if main race not completed', () => {
+      const mainSession = createMockSession({ sessionType: SessionType.main(), status: 'running' });
+      const sessions = [mainSession];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      expect(raceEvent.isMainRaceCompleted()).toBe(false);
+    });
+  });
+
+  describe('hasStewardingExpired', () => {
+    it('should return true if stewarding has expired', () => {
+      const pastDate = new Date(Date.now() - 3600000);
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        stewardingClosesAt: pastDate,
+      });
+      expect(raceEvent.hasStewardingExpired()).toBe(true);
+    });
+
+    it('should return false if stewarding not set', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      expect(raceEvent.hasStewardingExpired()).toBe(false);
+    });
+
+    it('should return false if stewarding not expired', () => {
+      const futureDate = new Date(Date.now() + 3600000);
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        stewardingClosesAt: futureDate,
+      });
+      expect(raceEvent.hasStewardingExpired()).toBe(false);
+    });
+  });
+
+  describe('isPast', () => {
+    it('should return true if latest session is in past', () => {
+      const pastDate = new Date(Date.now() - 3600000);
+      const sessions = [createMockSession({ scheduledAt: pastDate, sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      expect(raceEvent.isPast()).toBe(true);
+    });
+
+    it('should return false if latest session is future', () => {
+      const futureDate = new Date(Date.now() + 3600000);
+      const sessions = [createMockSession({ scheduledAt: futureDate, sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+      });
+      expect(raceEvent.isPast()).toBe(false);
+    });
+  });
+
+  describe('isUpcoming', () => {
+    it('should return true for scheduled future event', () => {
+      const futureDate = new Date(Date.now() + 3600000);
+      const sessions = [createMockSession({ scheduledAt: futureDate, sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'scheduled',
+      });
+      expect(raceEvent.isUpcoming()).toBe(true);
+    });
+
+    it('should return false for past scheduled event', () => {
+      const pastDate = new Date(Date.now() - 3600000);
+      const sessions = [createMockSession({ scheduledAt: pastDate, sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'scheduled',
+      });
+      expect(raceEvent.isUpcoming()).toBe(false);
+    });
+  });
+
+  describe('isLive', () => {
+    it('should return true for in_progress status', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'in_progress',
+      });
+      expect(raceEvent.isLive()).toBe(true);
+    });
+
+    it('should return false for other statuses', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'scheduled',
+      });
+      expect(raceEvent.isLive()).toBe(false);
+    });
+  });
+
+  describe('isAwaitingStewarding', () => {
+    it('should return true for awaiting_stewarding status', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'awaiting_stewarding',
+      });
+      expect(raceEvent.isAwaitingStewarding()).toBe(true);
+    });
+  });
+
+  describe('isClosed', () => {
+    it('should return true for closed status', () => {
+      const sessions = [createMockSession({ sessionType: SessionType.main() })];
+      const raceEvent = RaceEvent.create({
+        id: 'race-event-1',
+        seasonId: 'season-1',
+        leagueId: 'league-1',
+        name: 'Monza Grand Prix',
+        sessions,
+        status: 'closed',
+      });
+      expect(raceEvent.isClosed()).toBe(true);
+    });
+  });
+});

core/racing/domain/entities/RaceEvent.ts

@@ -8,7 +8,7 @@
 import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
 import type { IEntity } from '@core/shared/domain';
 import type { Session } from './Session';
-import type { SessionType } from '../value-objects/SessionType';
+import { SessionType } from '../value-objects/SessionType';
 
 export type RaceEventStatus = 'scheduled' | 'in_progress' | 'awaiting_stewarding' | 'closed' | 'cancelled';
 
@@ -127,9 +127,9 @@ export class RaceEvent implements IEntity<string> {
       seasonId: this.seasonId,
       leagueId: this.leagueId,
       name: this.name,
-      sessions: this.sessions,
+      sessions: [...this.sessions],
       status: 'in_progress',
-      stewardingClosesAt: this.stewardingClosesAt,
+      ...(this.stewardingClosesAt !== undefined ? { stewardingClosesAt: this.stewardingClosesAt } : {}),
     });
   }
 
@@ -151,9 +151,9 @@ export class RaceEvent implements IEntity<string> {
       seasonId: this.seasonId,
       leagueId: this.leagueId,
       name: this.name,
-      sessions: this.sessions,
+      sessions: [...this.sessions],
       status: 'awaiting_stewarding',
-      stewardingClosesAt: this.stewardingClosesAt,
+      ...(this.stewardingClosesAt !== undefined ? { stewardingClosesAt: this.stewardingClosesAt } : {}),
     });
   }
 
@@ -170,9 +170,9 @@ export class RaceEvent implements IEntity<string> {
       seasonId: this.seasonId,
       leagueId: this.leagueId,
       name: this.name,
-      sessions: this.sessions,
+      sessions: [...this.sessions],
       status: 'closed',
-      stewardingClosesAt: this.stewardingClosesAt,
+      ...(this.stewardingClosesAt !== undefined ? { stewardingClosesAt: this.stewardingClosesAt } : {}),
     });
   }
 
@@ -193,9 +193,9 @@ export class RaceEvent implements IEntity<string> {
       seasonId: this.seasonId,
       leagueId: this.leagueId,
       name: this.name,
-      sessions: this.sessions,
+      sessions: [...this.sessions],
       status: 'cancelled',
-      stewardingClosesAt: this.stewardingClosesAt,
+      ...(this.stewardingClosesAt !== undefined ? { stewardingClosesAt: this.stewardingClosesAt } : {}),
     });
   }
 
@@ -232,7 +232,7 @@ export class RaceEvent implements IEntity<string> {
    */
   isMainRaceCompleted(): boolean {
     const mainRace = this.getMainRaceSession();
-    return mainRace?.status === 'completed' ?? false;
+    return mainRace ? mainRace.status === 'completed' : false;
   }
 
   /**

core/racing/domain/entities/RaceId.test.ts

@@ -0,0 +1,38 @@
+import { RaceId } from './RaceId';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('RaceId', () => {
+  describe('create', () => {
+    it('should create a RaceId with valid value', () => {
+      const id = RaceId.create('race-123');
+      expect(id.toString()).toBe('race-123');
+    });
+
+    it('should trim whitespace', () => {
+      const id = RaceId.create('  race-123  ');
+      expect(id.toString()).toBe('race-123');
+    });
+
+    it('should throw error for empty string', () => {
+      expect(() => RaceId.create('')).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for whitespace only', () => {
+      expect(() => RaceId.create('   ')).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('equals', () => {
+    it('should return true for equal ids', () => {
+      const id1 = RaceId.create('race-123');
+      const id2 = RaceId.create('race-123');
+      expect(id1.equals(id2)).toBe(true);
+    });
+
+    it('should return false for different ids', () => {
+      const id1 = RaceId.create('race-123');
+      const id2 = RaceId.create('race-456');
+      expect(id1.equals(id2)).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/RaceId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class RaceId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): RaceId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Race ID cannot be empty');
+    }
+    return new RaceId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: RaceId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/RaceRegistration.test.ts

@@ -0,0 +1,120 @@
+import { RaceRegistration } from './RaceRegistration';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+import { RaceId } from './RaceId';
+import { DriverId } from './DriverId';
+import { RegisteredAt } from './RegisteredAt';
+
+describe('RaceRegistration', () => {
+  const validRaceId = 'race-123';
+  const validDriverId = 'driver-456';
+  const validDate = new Date('2023-01-01T00:00:00Z');
+
+  describe('create', () => {
+    it('should create a RaceRegistration with valid props', () => {
+      const props = {
+        raceId: validRaceId,
+        driverId: validDriverId,
+        registeredAt: validDate,
+      };
+
+      const registration = RaceRegistration.create(props);
+
+      expect(registration.id).toBe(`${validRaceId}:${validDriverId}`);
+      expect(registration.raceId.toString()).toBe(validRaceId);
+      expect(registration.driverId.toString()).toBe(validDriverId);
+      expect(registration.registeredAt.toDate()).toEqual(validDate);
+    });
+
+    it('should create with default registeredAt if not provided', () => {
+      const props = {
+        raceId: validRaceId,
+        driverId: validDriverId,
+      };
+
+      const registration = RaceRegistration.create(props);
+
+      expect(registration.registeredAt).toBeDefined();
+      expect(registration.registeredAt.toDate()).toBeInstanceOf(Date);
+    });
+
+    it('should use provided id if given', () => {
+      const customId = 'custom-id';
+      const props = {
+        id: customId,
+        raceId: validRaceId,
+        driverId: validDriverId,
+      };
+
+      const registration = RaceRegistration.create(props);
+
+      expect(registration.id).toBe(customId);
+    });
+
+    it('should throw error for empty raceId', () => {
+      const props = {
+        raceId: '',
+        driverId: validDriverId,
+      };
+
+      expect(() => RaceRegistration.create(props)).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for empty driverId', () => {
+      const props = {
+        raceId: validRaceId,
+        driverId: '',
+      };
+
+      expect(() => RaceRegistration.create(props)).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid raceId', () => {
+      const props = {
+        raceId: '   ',
+        driverId: validDriverId,
+      };
+
+      expect(() => RaceRegistration.create(props)).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid driverId', () => {
+      const props = {
+        raceId: validRaceId,
+        driverId: '   ',
+      };
+
+      expect(() => RaceRegistration.create(props)).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('entity properties', () => {
+    let registration: RaceRegistration;
+
+    beforeEach(() => {
+      registration = RaceRegistration.create({
+        raceId: validRaceId,
+        driverId: validDriverId,
+        registeredAt: validDate,
+      });
+    });
+
+    it('should have readonly id', () => {
+      expect(registration.id).toBe(`${validRaceId}:${validDriverId}`);
+    });
+
+    it('should have readonly raceId as RaceId', () => {
+      expect(registration.raceId).toBeInstanceOf(RaceId);
+      expect(registration.raceId.toString()).toBe(validRaceId);
+    });
+
+    it('should have readonly driverId as DriverId', () => {
+      expect(registration.driverId).toBeInstanceOf(DriverId);
+      expect(registration.driverId.toString()).toBe(validDriverId);
+    });
+
+    it('should have readonly registeredAt as RegisteredAt', () => {
+      expect(registration.registeredAt).toBeInstanceOf(RegisteredAt);
+      expect(registration.registeredAt.toDate()).toEqual(validDate);
+    });
+  });
+});

core/racing/domain/entities/RaceRegistration.ts

@@ -6,52 +6,62 @@
 
 import type { IEntity } from '@core/shared/domain';
 import { RacingDomainValidationError } from '../errors/RacingDomainError';
+import { RaceId } from './RaceId';
+import { DriverId } from './DriverId';
+import { RegisteredAt } from './RegisteredAt';
 
 export interface RaceRegistrationProps {
-  id?: string;
-  raceId: string;
-  driverId: string;
-  registeredAt?: Date;
+   id?: string;
+   raceId: string;
+   driverId: string;
+   registeredAt?: Date;
 }
 
 export class RaceRegistration implements IEntity<string> {
-  readonly id: string;
-  readonly raceId: string;
-  readonly driverId: string;
-  readonly registeredAt: Date;
+   readonly id: string;
+   readonly raceId: RaceId;
+   readonly driverId: DriverId;
+   readonly registeredAt: RegisteredAt;
 
-  private constructor(props: Required<RaceRegistrationProps>) {
-    this.id = props.id;
-    this.raceId = props.raceId;
-    this.driverId = props.driverId;
-    this.registeredAt = props.registeredAt;
-  }
+   private constructor(props: {
+      id: string;
+      raceId: RaceId;
+      driverId: DriverId;
+      registeredAt: RegisteredAt;
+   }) {
+      this.id = props.id;
+      this.raceId = props.raceId;
+      this.driverId = props.driverId;
+      this.registeredAt = props.registeredAt;
+   }
 
-  static create(props: RaceRegistrationProps): RaceRegistration {
-    this.validate(props);
+   static create(props: RaceRegistrationProps): RaceRegistration {
+      RaceRegistration.validate(props);
 
-    const id =
-      props.id && props.id.trim().length > 0
-        ? props.id
-        : `${props.raceId}:${props.driverId}`;
+      const raceId = RaceId.create(props.raceId);
+      const driverId = DriverId.create(props.driverId);
+      const registeredAt = RegisteredAt.create(props.registeredAt ?? new Date());
 
-    const registeredAt = props.registeredAt ?? new Date();
+      const id =
+         props.id && props.id.trim().length > 0
+            ? props.id
+            : `${raceId.toString()}:${driverId.toString()}`;
 
-    return new RaceRegistration({
-      id,
-      raceId: props.raceId,
-      driverId: props.driverId,
-      registeredAt,
-    });
-  }
+      return new RaceRegistration({
+         id,
+         raceId,
+         driverId,
+         registeredAt,
+      });
+   }
 
-  private static validate(props: RaceRegistrationProps): void {
-    if (!props.raceId || props.raceId.trim().length === 0) {
-      throw new RacingDomainValidationError('Race ID is required');
-    }
+   private static validate(props: RaceRegistrationProps): void {
+      if (!props.raceId || props.raceId.trim().length === 0) {
+         throw new RacingDomainValidationError('Race ID is required');
+      }
 
-    if (!props.driverId || props.driverId.trim().length === 0) {
-      throw new RacingDomainValidationError('Driver ID is required');
-    }
-  }
+      if (!props.driverId || props.driverId.trim().length === 0) {
+         throw new RacingDomainValidationError('Driver ID is required');
+      }
+   }
 }

core/racing/domain/entities/RegisteredAt.test.ts

@@ -0,0 +1,44 @@
+import { RegisteredAt } from './RegisteredAt';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('RegisteredAt', () => {
+  describe('create', () => {
+    it('should create a RegisteredAt with a valid date', () => {
+      const date = new Date('2023-01-01T00:00:00Z');
+      const registeredAt = RegisteredAt.create(date);
+      expect(registeredAt.toDate()).toEqual(date);
+    });
+
+    it('should throw an error for invalid date', () => {
+      expect(() => RegisteredAt.create(new Date('invalid'))).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('toDate', () => {
+    it('should return a copy of the date', () => {
+      const date = new Date();
+      const registeredAt = RegisteredAt.create(date);
+      const result = registeredAt.toDate();
+      expect(result).toEqual(date);
+      expect(result).not.toBe(date); // should be a copy
+    });
+  });
+
+  describe('equals', () => {
+    it('should return true for equal dates', () => {
+      const date1 = new Date('2023-01-01T00:00:00Z');
+      const date2 = new Date('2023-01-01T00:00:00Z');
+      const registeredAt1 = RegisteredAt.create(date1);
+      const registeredAt2 = RegisteredAt.create(date2);
+      expect(registeredAt1.equals(registeredAt2)).toBe(true);
+    });
+
+    it('should return false for different dates', () => {
+      const date1 = new Date('2023-01-01T00:00:00Z');
+      const date2 = new Date('2023-01-02T00:00:00Z');
+      const registeredAt1 = RegisteredAt.create(date1);
+      const registeredAt2 = RegisteredAt.create(date2);
+      expect(registeredAt1.equals(registeredAt2)).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/RegisteredAt.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class RegisteredAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): RegisteredAt {
+    if (!(value instanceof Date) || isNaN(value.getTime())) {
+      throw new RacingDomainValidationError('RegisteredAt must be a valid Date');
+    }
+    return new RegisteredAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: RegisteredAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/ResultWithIncidents.ts

@@ -5,24 +5,28 @@
 import { RacingDomainValidationError } from '../errors/RacingDomainError';
 import type { IEntity } from '@core/shared/domain';
 import { RaceIncidents, type IncidentRecord } from '../value-objects/RaceIncidents';
+import { RaceId } from './RaceId';
+import { DriverId } from './DriverId';
+import { Position } from './result/Position';
+import { LapTime } from './result/LapTime';
 
 export class ResultWithIncidents implements IEntity<string> {
   readonly id: string;
-  readonly raceId: string;
-  readonly driverId: string;
-  readonly position: number;
-  readonly fastestLap: number;
+  readonly raceId: RaceId;
+  readonly driverId: DriverId;
+  readonly position: Position;
+  readonly fastestLap: LapTime;
   readonly incidents: RaceIncidents;
-  readonly startPosition: number;
+  readonly startPosition: Position;
 
   private constructor(props: {
     id: string;
-    raceId: string;
-    driverId: string;
-    position: number;
-    fastestLap: number;
+    raceId: RaceId;
+    driverId: DriverId;
+    position: Position;
+    fastestLap: LapTime;
     incidents: RaceIncidents;
-    startPosition: number;
+    startPosition: Position;
   }) {
     this.id = props.id;
     this.raceId = props.raceId;
@@ -45,8 +49,21 @@ export class ResultWithIncidents implements IEntity<string> {
     incidents: RaceIncidents;
     startPosition: number;
   }): ResultWithIncidents {
-    ResultWithIncidents.validate(props);
-    return new ResultWithIncidents(props);
+    this.validate(props);
+    const raceId = RaceId.create(props.raceId);
+    const driverId = DriverId.create(props.driverId);
+    const position = Position.create(props.position);
+    const fastestLap = LapTime.create(props.fastestLap);
+    const startPosition = Position.create(props.startPosition);
+    return new ResultWithIncidents({
+      id: props.id,
+      raceId,
+      driverId,
+      position,
+      fastestLap,
+      incidents: props.incidents,
+      startPosition,
+    });
   }
 
   /**
@@ -109,14 +126,14 @@ export class ResultWithIncidents implements IEntity<string> {
    * Calculate positions gained/lost
    */
   getPositionChange(): number {
-    return this.startPosition - this.position;
+    return this.startPosition.toNumber() - this.position.toNumber();
   }
 
   /**
    * Check if driver finished on podium
    */
   isPodium(): boolean {
-    return this.position <= 3;
+    return this.position.toNumber() <= 3;
   }
 
   /**

core/racing/domain/entities/ReviewedAt.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class ReviewedAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): ReviewedAt {
+    if (!(value instanceof Date) || isNaN(value.getTime())) {
+      throw new RacingDomainValidationError('ReviewedAt must be a valid Date');
+    }
+    return new ReviewedAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: ReviewedAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/ScoringPresetId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class ScoringPresetId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): ScoringPresetId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Scoring Preset ID cannot be empty');
+    }
+    return new ScoringPresetId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: ScoringPresetId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/Session.test.ts

@@ -0,0 +1,426 @@
+import { Session } from './Session';
+import { SessionType } from '../value-objects/SessionType';
+import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
+
+describe('Session', () => {
+  describe('create', () => {
+    it('should create a session with required fields', () => {
+      const scheduledAt = new Date('2023-01-01T10:00:00Z');
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      });
+
+      expect(session.id).toBe('session-1');
+      expect(session.raceEventId).toBe('race-event-1');
+      expect(session.scheduledAt).toEqual(scheduledAt);
+      expect(session.track).toBe('Monza');
+      expect(session.car).toBe('Ferrari SF21');
+      expect(session.sessionType).toEqual(SessionType.main());
+      expect(session.status).toBe('scheduled');
+      expect(session.trackId).toBeUndefined();
+      expect(session.carId).toBeUndefined();
+      expect(session.strengthOfField).toBeUndefined();
+      expect(session.registeredCount).toBeUndefined();
+      expect(session.maxParticipants).toBeUndefined();
+    });
+
+    it('should create a session with all fields', () => {
+      const scheduledAt = new Date('2023-01-01T10:00:00Z');
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        trackId: 'track-1',
+        car: 'Ferrari SF21',
+        carId: 'car-1',
+        sessionType: SessionType.qualifying(),
+        status: 'running',
+        strengthOfField: 1500,
+        registeredCount: 20,
+        maxParticipants: 24,
+      });
+
+      expect(session.id).toBe('session-1');
+      expect(session.raceEventId).toBe('race-event-1');
+      expect(session.scheduledAt).toEqual(scheduledAt);
+      expect(session.track).toBe('Monza');
+      expect(session.trackId).toBe('track-1');
+      expect(session.car).toBe('Ferrari SF21');
+      expect(session.carId).toBe('car-1');
+      expect(session.sessionType).toEqual(SessionType.qualifying());
+      expect(session.status).toBe('running');
+      expect(session.strengthOfField).toBe(1500);
+      expect(session.registeredCount).toBe(20);
+      expect(session.maxParticipants).toBe(24);
+    });
+
+    it('should throw error for invalid id', () => {
+      const scheduledAt = new Date();
+      expect(() => Session.create({
+        id: '',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid raceEventId', () => {
+      const scheduledAt = new Date();
+      expect(() => Session.create({
+        id: 'session-1',
+        raceEventId: '',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid scheduledAt', () => {
+      expect(() => Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt: 'invalid' as unknown as Date,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid track', () => {
+      const scheduledAt = new Date();
+      expect(() => Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: '',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid car', () => {
+      const scheduledAt = new Date();
+      expect(() => Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: '',
+        sessionType: SessionType.main(),
+      })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for invalid sessionType', () => {
+      const scheduledAt = new Date();
+      expect(() => Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: undefined as unknown as SessionType,
+      })).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('start', () => {
+    it('should start a scheduled session', () => {
+      const scheduledAt = new Date(Date.now() + 3600000); // future
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'scheduled',
+      });
+      const started = session.start();
+      expect(started.status).toBe('running');
+    });
+
+    it('should throw error if not scheduled', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'running',
+      });
+      expect(() => session.start()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('complete', () => {
+    it('should complete a running session', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'running',
+      });
+      const completed = session.complete();
+      expect(completed.status).toBe('completed');
+    });
+
+    it('should throw error if already completed', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'completed',
+      });
+      expect(() => session.complete()).toThrow(RacingDomainInvariantError);
+    });
+
+    it('should throw error if cancelled', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'cancelled',
+      });
+      expect(() => session.complete()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('cancel', () => {
+    it('should cancel a scheduled session', () => {
+      const scheduledAt = new Date(Date.now() + 3600000);
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'scheduled',
+      });
+      const cancelled = session.cancel();
+      expect(cancelled.status).toBe('cancelled');
+    });
+
+    it('should throw error if completed', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'completed',
+      });
+      expect(() => session.cancel()).toThrow(RacingDomainInvariantError);
+    });
+
+    it('should throw error if already cancelled', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'cancelled',
+      });
+      expect(() => session.cancel()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('updateField', () => {
+    it('should update strengthOfField and registeredCount', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      });
+      const updated = session.updateField(1600, 22);
+      expect(updated.strengthOfField).toBe(1600);
+      expect(updated.registeredCount).toBe(22);
+    });
+  });
+
+  describe('isPast', () => {
+    it('should return true for past session', () => {
+      const scheduledAt = new Date(Date.now() - 3600000); // past
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      });
+      expect(session.isPast()).toBe(true);
+    });
+
+    it('should return false for future session', () => {
+      const scheduledAt = new Date(Date.now() + 3600000); // future
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      });
+      expect(session.isPast()).toBe(false);
+    });
+  });
+
+  describe('isUpcoming', () => {
+    it('should return true for scheduled future session', () => {
+      const scheduledAt = new Date(Date.now() + 3600000); // future
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'scheduled',
+      });
+      expect(session.isUpcoming()).toBe(true);
+    });
+
+    it('should return false for past scheduled session', () => {
+      const scheduledAt = new Date(Date.now() - 3600000); // past
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'scheduled',
+      });
+      expect(session.isUpcoming()).toBe(false);
+    });
+
+    it('should return false for running session', () => {
+      const scheduledAt = new Date(Date.now() + 3600000);
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'running',
+      });
+      expect(session.isUpcoming()).toBe(false);
+    });
+  });
+
+  describe('isLive', () => {
+    it('should return true for running session', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'running',
+      });
+      expect(session.isLive()).toBe(true);
+    });
+
+    it('should return false for scheduled session', () => {
+      const scheduledAt = new Date();
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt,
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+        status: 'scheduled',
+      });
+      expect(session.isLive()).toBe(false);
+    });
+  });
+
+  describe('countsForPoints', () => {
+    it('should return true for main session', () => {
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt: new Date(),
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.main(),
+      });
+      expect(session.countsForPoints()).toBe(true);
+    });
+
+    it('should return false for practice session', () => {
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt: new Date(),
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.practice(),
+      });
+      expect(session.countsForPoints()).toBe(false);
+    });
+  });
+
+  describe('determinesGrid', () => {
+    it('should return true for qualifying session', () => {
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt: new Date(),
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.qualifying(),
+      });
+      expect(session.determinesGrid()).toBe(true);
+    });
+
+    it('should return false for practice session', () => {
+      const session = Session.create({
+        id: 'session-1',
+        raceEventId: 'race-event-1',
+        scheduledAt: new Date(),
+        track: 'Monza',
+        car: 'Ferrari SF21',
+        sessionType: SessionType.practice(),
+      });
+      expect(session.determinesGrid()).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/Sponsor.ts

@@ -1,122 +0,0 @@
-/**
- * Domain Entity: Sponsor
- *
- * Represents a sponsor that can sponsor leagues/seasons.
- * Aggregate root for sponsor information.
- */
-import { RacingDomainValidationError } from '../errors/RacingDomainError';
-import type { IEntity } from '@core/shared/domain';
-
-export interface SponsorProps {
-  id: string;
-  name: string;
-  contactEmail: string;
-  logoUrl?: string;
-  websiteUrl?: string;
-  createdAt: Date;
-}
-
-export class Sponsor implements IEntity<string> {
-  readonly id: string;
-  readonly name: string;
-  readonly contactEmail: string;
-  readonly logoUrl: string | undefined;
-  readonly websiteUrl: string | undefined;
-  readonly createdAt: Date;
-
-  private constructor(props: SponsorProps) {
-    this.id = props.id;
-    this.name = props.name;
-    this.contactEmail = props.contactEmail;
-    this.logoUrl = props.logoUrl;
-    this.websiteUrl = props.websiteUrl;
-    this.createdAt = props.createdAt;
-  }
-
-  static create(props: Omit<SponsorProps, 'createdAt'> & { createdAt?: Date }): Sponsor {
-    this.validate(props);
-
-    const { createdAt, ...rest } = props;
-    const base = {
-      id: rest.id,
-      name: rest.name,
-      contactEmail: rest.contactEmail,
-      createdAt: createdAt ?? new Date(),
-    };
-
-    const withLogo =
-      rest.logoUrl !== undefined ? { ...base, logoUrl: rest.logoUrl } : base;
-    const withWebsite =
-      rest.websiteUrl !== undefined
-        ? { ...withLogo, websiteUrl: rest.websiteUrl }
-        : withLogo;
-
-    return new Sponsor(withWebsite);
-  }
-
-  private static validate(props: Omit<SponsorProps, 'createdAt'>): void {
-    if (!props.id || props.id.trim().length === 0) {
-      throw new RacingDomainValidationError('Sponsor ID is required');
-    }
-
-    if (!props.name || props.name.trim().length === 0) {
-      throw new RacingDomainValidationError('Sponsor name is required');
-    }
-
-    if (props.name.length > 100) {
-      throw new RacingDomainValidationError('Sponsor name must be 100 characters or less');
-    }
-
-    if (!props.contactEmail || props.contactEmail.trim().length === 0) {
-      throw new RacingDomainValidationError('Sponsor contact email is required');
-    }
-
-    // Basic email validation
-    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
-    if (!emailRegex.test(props.contactEmail)) {
-      throw new RacingDomainValidationError('Invalid sponsor contact email format');
-    }
-
-    if (props.websiteUrl && props.websiteUrl.trim().length > 0) {
-      try {
-        new URL(props.websiteUrl);
-      } catch {
-        throw new RacingDomainValidationError('Invalid sponsor website URL');
-      }
-    }
-  }
-
-  /**
-   * Update sponsor information
-   */
-  update(props: Partial<{
-    name: string;
-    contactEmail: string;
-    logoUrl?: string;
-    websiteUrl?: string;
-  }>): Sponsor {
-    const updatedBase = {
-      id: this.id,
-      name: props.name ?? this.name,
-      contactEmail: props.contactEmail ?? this.contactEmail,
-      createdAt: this.createdAt,
-    };
-
-    const withLogo =
-      props.logoUrl !== undefined
-        ? { ...updatedBase, logoUrl: props.logoUrl }
-        : this.logoUrl !== undefined
-        ? { ...updatedBase, logoUrl: this.logoUrl }
-        : updatedBase;
-
-    const updated =
-      props.websiteUrl !== undefined
-        ? { ...withLogo, websiteUrl: props.websiteUrl }
-        : this.websiteUrl !== undefined
-        ? { ...withLogo, websiteUrl: this.websiteUrl }
-        : withLogo;
-
-    Sponsor.validate(updated);
-    return new Sponsor(updated);
-  }
-}

core/racing/domain/entities/SponsorshipRequest.test.ts

@@ -0,0 +1,161 @@
+import { SponsorshipRequest, SponsorableEntityType, SponsorshipRequestProps } from './SponsorshipRequest';
+import { SponsorshipTier } from './season/SeasonSponsorship';
+import { Money } from '../value-objects/Money';
+import { RacingDomainValidationError, RacingDomainInvariantError } from '../errors/RacingDomainError';
+
+describe('SponsorshipRequest', () => {
+  const validMoney = Money.create(1000, 'USD');
+  const validProps = {
+    id: 'request-123',
+    sponsorId: 'sponsor-456',
+    entityType: 'driver',
+    entityId: 'driver-789',
+    tier: 'main',
+    offeredAmount: validMoney,
+  };
+
+  describe('create', () => {
+    it('should create a SponsorshipRequest with valid props', () => {
+      const request = SponsorshipRequest.create(validProps);
+      expect(request.id).toBe('request-123');
+      expect(request.sponsorId).toBe('sponsor-456');
+      expect(request.entityType).toBe('driver');
+      expect(request.entityId).toBe('driver-789');
+      expect(request.tier).toBe('main');
+      expect(request.offeredAmount).toEqual(validMoney);
+      expect(request.status).toBe('pending');
+      expect(request.createdAt).toBeInstanceOf(Date);
+    });
+
+    it('should use provided createdAt and status', () => {
+      const customDate = new Date('2023-01-01');
+      const request = SponsorshipRequest.create({
+        ...validProps,
+        createdAt: customDate,
+        status: 'accepted',
+      });
+      expect(request.createdAt).toBe(customDate);
+      expect(request.status).toBe('accepted');
+    });
+
+    it('should throw for invalid id', () => {
+      expect(() => SponsorshipRequest.create({ ...validProps, id: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw for invalid sponsorId', () => {
+      expect(() => SponsorshipRequest.create({ ...validProps, sponsorId: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw for invalid entityId', () => {
+      expect(() => SponsorshipRequest.create({ ...validProps, entityId: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw for zero offeredAmount', () => {
+      const zeroMoney = Money.create(0, 'USD');
+      expect(() => SponsorshipRequest.create({ ...validProps, offeredAmount: zeroMoney })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw for negative offeredAmount', () => {
+      expect(() => Money.create(-100, 'USD')).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('accept', () => {
+    it('should accept a pending request', () => {
+      const request = SponsorshipRequest.create(validProps);
+      const accepted = request.accept('responder-123');
+      expect(accepted.status).toBe('accepted');
+      expect(accepted.respondedAt).toBeInstanceOf(Date);
+      expect(accepted.respondedBy).toBe('responder-123');
+    });
+
+    it('should throw for non-pending request', () => {
+      const acceptedRequest = SponsorshipRequest.create({ ...validProps, status: 'accepted' });
+      expect(() => acceptedRequest.accept('responder-123')).toThrow(RacingDomainInvariantError);
+    });
+
+    it('should throw for empty respondedBy', () => {
+      const request = SponsorshipRequest.create(validProps);
+      expect(() => request.accept('')).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('reject', () => {
+    it('should reject a pending request with reason', () => {
+      const request = SponsorshipRequest.create(validProps);
+      const rejected = request.reject('responder-123', 'Not interested');
+      expect(rejected.status).toBe('rejected');
+      expect(rejected.respondedAt).toBeInstanceOf(Date);
+      expect(rejected.respondedBy).toBe('responder-123');
+      expect(rejected.rejectionReason).toBe('Not interested');
+    });
+
+    it('should reject without reason', () => {
+      const request = SponsorshipRequest.create(validProps);
+      const rejected = request.reject('responder-123');
+      expect(rejected.status).toBe('rejected');
+      expect(rejected.rejectionReason).toBeUndefined();
+    });
+
+    it('should throw for non-pending request', () => {
+      const rejectedRequest = SponsorshipRequest.create({ ...validProps, status: 'rejected' });
+      expect(() => rejectedRequest.reject('responder-123')).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('withdraw', () => {
+    it('should withdraw a pending request', () => {
+      const request = SponsorshipRequest.create(validProps);
+      const withdrawn = request.withdraw();
+      expect(withdrawn.status).toBe('withdrawn');
+      expect(withdrawn.respondedAt).toBeInstanceOf(Date);
+    });
+
+    it('should throw for non-pending request', () => {
+      const acceptedRequest = SponsorshipRequest.create({ ...validProps, status: 'accepted' });
+      expect(() => acceptedRequest.withdraw()).toThrow(RacingDomainInvariantError);
+    });
+  });
+
+  describe('isPending', () => {
+    it('should return true for pending status', () => {
+      const request = SponsorshipRequest.create(validProps);
+      expect(request.isPending()).toBe(true);
+    });
+
+    it('should return false for non-pending status', () => {
+      const acceptedRequest = SponsorshipRequest.create({ ...validProps, status: 'accepted' });
+      expect(acceptedRequest.isPending()).toBe(false);
+    });
+  });
+
+  describe('isAccepted', () => {
+    it('should return true for accepted status', () => {
+      const acceptedRequest = SponsorshipRequest.create({ ...validProps, status: 'accepted' });
+      expect(acceptedRequest.isAccepted()).toBe(true);
+    });
+
+    it('should return false for non-accepted status', () => {
+      const request = SponsorshipRequest.create(validProps);
+      expect(request.isAccepted()).toBe(false);
+    });
+  });
+
+  describe('getPlatformFee', () => {
+    it('should calculate platform fee', () => {
+      const request = SponsorshipRequest.create(validProps);
+      const fee = request.getPlatformFee();
+      expect(fee.amount).toBe(100); // 10% of 1000
+      expect(fee.currency).toBe('USD');
+    });
+  });
+
+  describe('getNetAmount', () => {
+    it('should calculate net amount', () => {
+      const request = SponsorshipRequest.create(validProps);
+      const net = request.getNetAmount();
+      expect(net.amount).toBe(900); // 1000 - 100
+      expect(net.currency).toBe('USD');
+    });
+  });
+});

core/racing/domain/entities/Standing.test.ts

@@ -0,0 +1,135 @@
+import { Standing } from './Standing';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('Standing', () => {
+  const validProps = {
+    id: 'standing-123',
+    leagueId: 'league-456',
+    driverId: 'driver-789',
+    points: 100,
+    wins: 5,
+    position: 2,
+    racesCompleted: 10,
+  };
+
+  describe('create', () => {
+    it('should create a Standing with valid props', () => {
+      const standing = Standing.create(validProps);
+      expect(standing.id).toBe('standing-123');
+      expect(standing.leagueId.toString()).toBe('league-456');
+      expect(standing.driverId.toString()).toBe('driver-789');
+      expect(standing.points.toNumber()).toBe(100);
+      expect(standing.wins).toBe(5);
+      expect(standing.position.toNumber()).toBe(2);
+      expect(standing.racesCompleted).toBe(10);
+    });
+
+    it('should generate id if not provided', () => {
+      const propsWithoutId = {
+        leagueId: 'league-456',
+        driverId: 'driver-789',
+        points: 100,
+        wins: 5,
+        position: 2,
+        racesCompleted: 10,
+      };
+      const standing = Standing.create(propsWithoutId);
+      expect(standing.id).toBe('league-456:driver-789');
+    });
+
+    it('should use defaults for optional props', () => {
+      const minimalProps = {
+        leagueId: 'league-456',
+        driverId: 'driver-789',
+      };
+      const standing = Standing.create(minimalProps);
+      expect(standing.points.toNumber()).toBe(0);
+      expect(standing.wins).toBe(0);
+      expect(standing.position.toNumber()).toBe(1);
+      expect(standing.racesCompleted).toBe(0);
+    });
+
+    it('should throw for invalid leagueId', () => {
+      expect(() => Standing.create({ ...validProps, leagueId: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw for invalid driverId', () => {
+      expect(() => Standing.create({ ...validProps, driverId: '' })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw for negative points', () => {
+      expect(() => Standing.create({ ...validProps, points: -1 })).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw for invalid position', () => {
+      expect(() => Standing.create({ ...validProps, position: 0 })).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('addRaceResult', () => {
+    it('should add points and increment races completed', () => {
+      const standing = Standing.create(validProps);
+      const pointsSystem = { 1: 25, 2: 18, 3: 15 };
+      const updated = standing.addRaceResult(1, pointsSystem);
+      expect(updated.points.toNumber()).toBe(125); // 100 + 25
+      expect(updated.wins).toBe(6); // 5 + 1
+      expect(updated.racesCompleted).toBe(11); // 10 + 1
+    });
+
+    it('should not add win for non-first position', () => {
+      const standing = Standing.create(validProps);
+      const pointsSystem = { 1: 25, 2: 18, 3: 15 };
+      const updated = standing.addRaceResult(2, pointsSystem);
+      expect(updated.points.toNumber()).toBe(118); // 100 + 18
+      expect(updated.wins).toBe(5); // no change
+      expect(updated.racesCompleted).toBe(11);
+    });
+
+    it('should handle position not in points system', () => {
+      const standing = Standing.create(validProps);
+      const pointsSystem = { 1: 25, 2: 18 };
+      const updated = standing.addRaceResult(5, pointsSystem);
+      expect(updated.points.toNumber()).toBe(100); // no points
+      expect(updated.wins).toBe(5);
+      expect(updated.racesCompleted).toBe(11);
+    });
+  });
+
+  describe('updatePosition', () => {
+    it('should update position', () => {
+      const standing = Standing.create(validProps);
+      const updated = standing.updatePosition(1);
+      expect(updated.position.toNumber()).toBe(1);
+      expect(updated.points.toNumber()).toBe(100); // unchanged
+    });
+
+    it('should throw for invalid position', () => {
+      const standing = Standing.create(validProps);
+      expect(() => standing.updatePosition(0)).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('getAveragePoints', () => {
+    it('should calculate average points', () => {
+      const standing = Standing.create(validProps);
+      expect(standing.getAveragePoints()).toBe(10); // 100 / 10
+    });
+
+    it('should return 0 for no races completed', () => {
+      const standing = Standing.create({ ...validProps, racesCompleted: 0 });
+      expect(standing.getAveragePoints()).toBe(0);
+    });
+  });
+
+  describe('getWinPercentage', () => {
+    it('should calculate win percentage', () => {
+      const standing = Standing.create(validProps);
+      expect(standing.getWinPercentage()).toBe(50); // 5 / 10 * 100
+    });
+
+    it('should return 0 for no races completed', () => {
+      const standing = Standing.create({ ...validProps, racesCompleted: 0 });
+      expect(standing.getWinPercentage()).toBe(0);
+    });
+  });
+});

core/racing/domain/entities/Standing.ts

@@ -4,26 +4,31 @@
  * Represents a championship standing in the GridPilot platform.
  * Immutable entity with factory methods and domain validation.
  */
- 
+
 
 import type { IEntity } from '@core/shared/domain';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+import { LeagueId } from './LeagueId';
+import { DriverId } from './DriverId';
+import { Points } from '../value-objects/Points';
+import { Position } from './championship/Position';
 
 export class Standing implements IEntity<string> {
   readonly id: string;
-  readonly leagueId: string;
-  readonly driverId: string;
-  readonly points: number;
+  readonly leagueId: LeagueId;
+  readonly driverId: DriverId;
+  readonly points: Points;
   readonly wins: number;
-  readonly position: number;
+  readonly position: Position;
   readonly racesCompleted: number;
- 
+
   private constructor(props: {
     id: string;
-    leagueId: string;
-    driverId: string;
-    points: number;
+    leagueId: LeagueId;
+    driverId: DriverId;
+    points: Points;
     wins: number;
-    position: number;
+    position: Position;
     racesCompleted: number;
   }) {
     this.id = props.id;
@@ -47,19 +52,24 @@ export class Standing implements IEntity<string> {
     position?: number;
     racesCompleted?: number;
   }): Standing {
-    this.validate(props);
+    Standing.validate(props);
 
     const id = props.id && props.id.trim().length > 0
       ? props.id
       : `${props.leagueId}:${props.driverId}`;
 
+    const leagueId = LeagueId.create(props.leagueId);
+    const driverId = DriverId.create(props.driverId);
+    const points = Points.create(props.points ?? 0);
+    const position = Position.create(props.position ?? 1); // Default to 1 for position
+
     return new Standing({
       id,
-      leagueId: props.leagueId,
-      driverId: props.driverId,
-      points: props.points ?? 0,
+      leagueId,
+      driverId,
+      points,
       wins: props.wins ?? 0,
-      position: props.position ?? 0,
+      position,
       racesCompleted: props.racesCompleted ?? 0,
     });
   }
@@ -75,7 +85,7 @@ export class Standing implements IEntity<string> {
     if (!props.leagueId || props.leagueId.trim().length === 0) {
       throw new RacingDomainValidationError('League ID is required');
     }
- 
+
     if (!props.driverId || props.driverId.trim().length === 0) {
       throw new RacingDomainValidationError('Driver ID is required');
     }
@@ -88,13 +98,16 @@ export class Standing implements IEntity<string> {
     const racePoints = pointsSystem[position] ?? 0;
     const isWin = position === 1;
 
+    const newPoints = Points.create(this.points.toNumber() + racePoints);
+    const newPosition = this.position; // Position might be updated separately
+
     return new Standing({
       id: this.id,
       leagueId: this.leagueId,
       driverId: this.driverId,
-      points: this.points + racePoints,
+      points: newPoints,
       wins: this.wins + (isWin ? 1 : 0),
-      position: this.position,
+      position: newPosition,
       racesCompleted: this.racesCompleted + 1,
     });
   }
@@ -103,17 +116,15 @@ export class Standing implements IEntity<string> {
    * Update championship position
    */
   updatePosition(position: number): Standing {
-    if (!Number.isInteger(position) || position < 1) {
-      throw new RacingDomainValidationError('Position must be a positive integer');
-    }
+    const newPosition = Position.create(position);
 
-    return Standing.create({
+    return new Standing({
       id: this.id,
       leagueId: this.leagueId,
       driverId: this.driverId,
       points: this.points,
       wins: this.wins,
-      position,
+      position: newPosition,
       racesCompleted: this.racesCompleted,
     });
   }
@@ -123,7 +134,7 @@ export class Standing implements IEntity<string> {
    */
   getAveragePoints(): number {
     if (this.racesCompleted === 0) return 0;
-    return this.points / this.racesCompleted;
+    return this.points.toNumber() / this.racesCompleted;
   }
 
   /**

core/racing/domain/entities/StewardId.test.ts

@@ -0,0 +1,38 @@
+import { StewardId } from './StewardId';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+describe('StewardId', () => {
+  describe('create', () => {
+    it('should create a StewardId with valid value', () => {
+      const id = StewardId.create('steward-123');
+      expect(id.toString()).toBe('steward-123');
+    });
+
+    it('should trim whitespace', () => {
+      const id = StewardId.create('  steward-123  ');
+      expect(id.toString()).toBe('steward-123');
+    });
+
+    it('should throw error for empty string', () => {
+      expect(() => StewardId.create('')).toThrow(RacingDomainValidationError);
+    });
+
+    it('should throw error for whitespace only', () => {
+      expect(() => StewardId.create('   ')).toThrow(RacingDomainValidationError);
+    });
+  });
+
+  describe('equals', () => {
+    it('should return true for equal ids', () => {
+      const id1 = StewardId.create('steward-123');
+      const id2 = StewardId.create('steward-123');
+      expect(id1.equals(id2)).toBe(true);
+    });
+
+    it('should return false for different ids', () => {
+      const id1 = StewardId.create('steward-123');
+      const id2 = StewardId.create('steward-456');
+      expect(id1.equals(id2)).toBe(false);
+    });
+  });
+});

core/racing/domain/entities/StewardId.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class StewardId {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): StewardId {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Steward ID cannot be empty');
+    }
+    return new StewardId(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: StewardId): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/SubmittedAt.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class SubmittedAt {
+  private constructor(private readonly value: Date) {}
+
+  static create(value: Date): SubmittedAt {
+    if (!(value instanceof Date) || isNaN(value.getTime())) {
+      throw new RacingDomainValidationError('SubmittedAt must be a valid Date');
+    }
+    return new SubmittedAt(new Date(value));
+  }
+
+  toDate(): Date {
+    return new Date(this.value);
+  }
+
+  equals(other: SubmittedAt): boolean {
+    return this.value.getTime() === other.value.getTime();
+  }
+}

core/racing/domain/entities/Team.test.ts

@@ -0,0 +1,195 @@
+import { describe, it, expect } from 'vitest';
+import { Team } from './Team';
+
+describe('Team', () => {
+  it('should create a team', () => {
+    const team = Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: ['league1', 'league2'],
+      createdAt: new Date('2020-01-01'),
+    });
+
+    expect(team.id).toBe('team1');
+    expect(team.name.toString()).toBe('Team Alpha');
+    expect(team.tag.toString()).toBe('TA');
+    expect(team.description.toString()).toBe('A great team');
+    expect(team.ownerId.toString()).toBe('driver1');
+    expect(team.leagues).toHaveLength(2);
+    expect(team.leagues[0]!.toString()).toBe('league1');
+    expect(team.leagues[1]!.toString()).toBe('league2');
+    expect(team.createdAt.toDate()).toEqual(new Date('2020-01-01'));
+  });
+
+  it('should create team with default createdAt', () => {
+    const before = new Date();
+    const team = Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+    });
+    const after = new Date();
+
+    expect(team.createdAt.toDate().getTime()).toBeGreaterThanOrEqual(before.getTime());
+    expect(team.createdAt.toDate().getTime()).toBeLessThanOrEqual(after.getTime());
+  });
+
+  it('should update name', () => {
+    const team = Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+    });
+
+    const updated = team.update({ name: 'Team Beta' });
+    expect(updated.name.toString()).toBe('Team Beta');
+    expect(updated.id).toBe('team1');
+  });
+
+  it('should update tag', () => {
+    const team = Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+    });
+
+    const updated = team.update({ tag: 'TB' });
+    expect(updated.tag.toString()).toBe('TB');
+  });
+
+  it('should update description', () => {
+    const team = Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+    });
+
+    const updated = team.update({ description: 'Updated description' });
+    expect(updated.description.toString()).toBe('Updated description');
+  });
+
+  it('should update ownerId', () => {
+    const team = Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+    });
+
+    const updated = team.update({ ownerId: 'driver2' });
+    expect(updated.ownerId.toString()).toBe('driver2');
+  });
+
+  it('should update leagues', () => {
+    const team = Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: ['league1'],
+    });
+
+    const updated = team.update({ leagues: ['league2', 'league3'] });
+    expect(updated.leagues).toHaveLength(2);
+    expect(updated.leagues[0]!.toString()).toBe('league2');
+    expect(updated.leagues[1]!.toString()).toBe('league3');
+  });
+
+  it('should throw on invalid id', () => {
+    expect(() => Team.create({
+      id: '',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+    })).toThrow('Team ID is required');
+  });
+
+  it('should throw on invalid name', () => {
+    expect(() => Team.create({
+      id: 'team1',
+      name: '',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+    })).toThrow('Team name is required');
+  });
+
+  it('should throw on invalid tag', () => {
+    expect(() => Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: '',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+    })).toThrow('Team tag is required');
+  });
+
+  it('should throw on invalid description', () => {
+    expect(() => Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: '',
+      ownerId: 'driver1',
+      leagues: [],
+    })).toThrow('Team description is required');
+  });
+
+  it('should throw on invalid ownerId', () => {
+    expect(() => Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: '',
+      leagues: [],
+    })).toThrow('Driver ID cannot be empty');
+  });
+
+  it('should throw on invalid leagues', () => {
+    expect(() => Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: 'not an array' as unknown as string[],
+    })).toThrow('Team leagues must be an array');
+  });
+
+  it('should throw on future createdAt', () => {
+    const future = new Date();
+    future.setFullYear(future.getFullYear() + 1);
+    expect(() => Team.create({
+      id: 'team1',
+      name: 'Team Alpha',
+      tag: 'TA',
+      description: 'A great team',
+      ownerId: 'driver1',
+      leagues: [],
+      createdAt: future,
+    })).toThrow('Created date cannot be in the future');
+  });
+});

core/racing/domain/entities/Team.ts

@@ -8,24 +8,30 @@
 
 import type { IEntity } from '@core/shared/domain';
 import { RacingDomainValidationError } from '../errors/RacingDomainError';
+import { TeamName } from '../value-objects/TeamName';
+import { TeamTag } from '../value-objects/TeamTag';
+import { TeamDescription } from '../value-objects/TeamDescription';
+import { DriverId } from './DriverId';
+import { LeagueId } from './LeagueId';
+import { TeamCreatedAt } from '../value-objects/TeamCreatedAt';
 
 export class Team implements IEntity<string> {
   readonly id: string;
-  readonly name: string;
-  readonly tag: string;
-  readonly description: string;
-  readonly ownerId: string;
-  readonly leagues: string[];
-  readonly createdAt: Date;
+  readonly name: TeamName;
+  readonly tag: TeamTag;
+  readonly description: TeamDescription;
+  readonly ownerId: DriverId;
+  readonly leagues: LeagueId[];
+  readonly createdAt: TeamCreatedAt;
 
   private constructor(props: {
     id: string;
-    name: string;
-    tag: string;
-    description: string;
-    ownerId: string;
-    leagues: string[];
-    createdAt: Date;
+    name: TeamName;
+    tag: TeamTag;
+    description: TeamDescription;
+    ownerId: DriverId;
+    leagues: LeagueId[];
+    createdAt: TeamCreatedAt;
   }) {
     this.id = props.id;
     this.name = props.name;
@@ -48,16 +54,22 @@ export class Team implements IEntity<string> {
     leagues: string[];
     createdAt?: Date;
   }): Team {
-    this.validate(props);
+    if (!props.id || props.id.trim().length === 0) {
+      throw new RacingDomainValidationError('Team ID is required');
+    }
+
+    if (!Array.isArray(props.leagues)) {
+      throw new RacingDomainValidationError('Team leagues must be an array');
+    }
 
     return new Team({
       id: props.id,
-      name: props.name,
-      tag: props.tag,
-      description: props.description,
-      ownerId: props.ownerId,
-      leagues: [...props.leagues],
-      createdAt: props.createdAt ?? new Date(),
+      name: TeamName.create(props.name),
+      tag: TeamTag.create(props.tag),
+      description: TeamDescription.create(props.description),
+      ownerId: DriverId.create(props.ownerId),
+      leagues: props.leagues.map(leagueId => LeagueId.create(leagueId)),
+      createdAt: TeamCreatedAt.create(props.createdAt ?? new Date()),
     });
   }
 
@@ -71,58 +83,21 @@ export class Team implements IEntity<string> {
     ownerId: string;
     leagues: string[];
   }>): Team {
-    const next: Team = new Team({
+    const nextName = 'name' in props ? TeamName.create(props.name!) : this.name;
+    const nextTag = 'tag' in props ? TeamTag.create(props.tag!) : this.tag;
+    const nextDescription = 'description' in props ? TeamDescription.create(props.description!) : this.description;
+    const nextOwnerId = 'ownerId' in props ? DriverId.create(props.ownerId!) : this.ownerId;
+    const nextLeagues = 'leagues' in props ? props.leagues!.map(leagueId => LeagueId.create(leagueId)) : this.leagues;
+
+    return new Team({
       id: this.id,
-      name: props.name ?? this.name,
-      tag: props.tag ?? this.tag,
-      description: props.description ?? this.description,
-      ownerId: props.ownerId ?? this.ownerId,
-      leagues: props.leagues ? [...props.leagues] : [...this.leagues],
+      name: nextName,
+      tag: nextTag,
+      description: nextDescription,
+      ownerId: nextOwnerId,
+      leagues: nextLeagues,
       createdAt: this.createdAt,
     });
-
-    // Re-validate updated aggregate
-    Team.validate({
-      id: next.id,
-      name: next.name,
-      tag: next.tag,
-      description: next.description,
-      ownerId: next.ownerId,
-      leagues: next.leagues,
-    });
-
-    return next;
   }
 
-  /**
-   * Domain validation logic for core invariants.
-   */
-  private static validate(props: {
-    id: string;
-    name: string;
-    tag: string;
-    description: string;
-    ownerId: string;
-    leagues: string[];
-  }): void {
-    if (!props.id || props.id.trim().length === 0) {
-      throw new RacingDomainValidationError('Team ID is required');
-    }
-
-    if (!props.name || props.name.trim().length === 0) {
-      throw new RacingDomainValidationError('Team name is required');
-    }
-
-    if (!props.tag || props.tag.trim().length === 0) {
-      throw new RacingDomainValidationError('Team tag is required');
-    }
-
-    if (!props.ownerId || props.ownerId.trim().length === 0) {
-      throw new RacingDomainValidationError('Team owner ID is required');
-    }
-
-    if (!Array.isArray(props.leagues)) {
-      throw new RacingDomainValidationError('Team leagues must be an array');
-    }
-  }
 }

core/racing/domain/entities/TimeInRace.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class TimeInRace {
+  private constructor(private readonly value: number) {}
+
+  static create(value: number): TimeInRace {
+    if (typeof value !== 'number' || value < 0 || isNaN(value)) {
+      throw new RacingDomainValidationError('Time in race must be a non-negative number');
+    }
+    return new TimeInRace(value);
+  }
+
+  toNumber(): number {
+    return this.value;
+  }
+
+  equals(other: TimeInRace): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/Track.test.ts

@@ -0,0 +1,137 @@
+import { describe, it, expect } from 'vitest';
+import { Track } from './Track';
+
+describe('Track', () => {
+  it('should create a track', () => {
+    const track = Track.create({
+      id: 'track1',
+      name: 'Monza Circuit',
+      shortName: 'MON',
+      country: 'Italy',
+      category: 'road',
+      difficulty: 'advanced',
+      lengthKm: 5.793,
+      turns: 11,
+      imageUrl: 'https://example.com/monza.jpg',
+      gameId: 'game1',
+    });
+
+    expect(track.id).toBe('track1');
+    expect(track.name.toString()).toBe('Monza Circuit');
+    expect(track.shortName.toString()).toBe('MON');
+    expect(track.country.toString()).toBe('Italy');
+    expect(track.category).toBe('road');
+    expect(track.difficulty).toBe('advanced');
+    expect(track.lengthKm.toNumber()).toBe(5.793);
+    expect(track.turns.toNumber()).toBe(11);
+    expect(track.imageUrl.toString()).toBe('https://example.com/monza.jpg');
+    expect(track.gameId.toString()).toBe('game1');
+  });
+
+  it('should create track with defaults', () => {
+    const track = Track.create({
+      id: 'track1',
+      name: 'Monza Circuit',
+      country: 'Italy',
+      lengthKm: 5.793,
+      turns: 11,
+      gameId: 'game1',
+    });
+
+    expect(track.shortName.toString()).toBe('MON');
+    expect(track.category).toBe('road');
+    expect(track.difficulty).toBe('intermediate');
+    expect(track.imageUrl.toString()).toBeUndefined();
+  });
+
+  it('should create track with generated shortName', () => {
+    const track = Track.create({
+      id: 'track1',
+      name: 'Silverstone',
+      country: 'UK',
+      lengthKm: 5.891,
+      turns: 18,
+      gameId: 'game1',
+    });
+
+    expect(track.shortName.toString()).toBe('SIL');
+  });
+
+  it('should throw on invalid id', () => {
+    expect(() => Track.create({
+      id: '',
+      name: 'Monza Circuit',
+      country: 'Italy',
+      lengthKm: 5.793,
+      turns: 11,
+      gameId: 'game1',
+    })).toThrow('Track ID is required');
+  });
+
+  it('should throw on invalid name', () => {
+    expect(() => Track.create({
+      id: 'track1',
+      name: '',
+      country: 'Italy',
+      lengthKm: 5.793,
+      turns: 11,
+      gameId: 'game1',
+    })).toThrow('Track name is required');
+  });
+
+  it('should throw on invalid country', () => {
+    expect(() => Track.create({
+      id: 'track1',
+      name: 'Monza Circuit',
+      country: '',
+      lengthKm: 5.793,
+      turns: 11,
+      gameId: 'game1',
+    })).toThrow('Track country is required');
+  });
+
+  it('should throw on invalid lengthKm', () => {
+    expect(() => Track.create({
+      id: 'track1',
+      name: 'Monza Circuit',
+      country: 'Italy',
+      lengthKm: 0,
+      turns: 11,
+      gameId: 'game1',
+    })).toThrow('Track length must be positive');
+  });
+
+  it('should throw on negative turns', () => {
+    expect(() => Track.create({
+      id: 'track1',
+      name: 'Monza Circuit',
+      country: 'Italy',
+      lengthKm: 5.793,
+      turns: -1,
+      gameId: 'game1',
+    })).toThrow('Track turns cannot be negative');
+  });
+
+  it('should throw on invalid gameId', () => {
+    expect(() => Track.create({
+      id: 'track1',
+      name: 'Monza Circuit',
+      country: 'Italy',
+      lengthKm: 5.793,
+      turns: 11,
+      gameId: '',
+    })).toThrow('Track game ID cannot be empty');
+  });
+
+  it('should throw on empty imageUrl string', () => {
+    expect(() => Track.create({
+      id: 'track1',
+      name: 'Monza Circuit',
+      country: 'Italy',
+      lengthKm: 5.793,
+      turns: 11,
+      imageUrl: '',
+      gameId: 'game1',
+    })).toThrow('Track image URL cannot be empty string');
+  });
+});

core/racing/domain/entities/Track.ts

@@ -4,36 +4,43 @@
  * Represents a racing track/circuit in the GridPilot platform.
  * Immutable entity with factory methods and domain validation.
  */
- 
+
 import { RacingDomainValidationError } from '../errors/RacingDomainError';
 import type { IEntity } from '@core/shared/domain';
+import { TrackName } from '../value-objects/TrackName';
+import { TrackShortName } from '../value-objects/TrackShortName';
+import { TrackCountry } from '../value-objects/TrackCountry';
+import { TrackLength } from '../value-objects/TrackLength';
+import { TrackTurns } from '../value-objects/TrackTurns';
+import { TrackGameId } from '../value-objects/TrackGameId';
+import { TrackImageUrl } from '../value-objects/TrackImageUrl';
 
 export type TrackCategory = 'oval' | 'road' | 'street' | 'dirt';
 export type TrackDifficulty = 'beginner' | 'intermediate' | 'advanced' | 'expert';
 
 export class Track implements IEntity<string> {
   readonly id: string;
-  readonly name: string;
-  readonly shortName: string;
-  readonly country: string;
+  readonly name: TrackName;
+  readonly shortName: TrackShortName;
+  readonly country: TrackCountry;
   readonly category: TrackCategory;
   readonly difficulty: TrackDifficulty;
-  readonly lengthKm: number;
-  readonly turns: number;
-  readonly imageUrl: string | undefined;
-  readonly gameId: string;
+  readonly lengthKm: TrackLength;
+  readonly turns: TrackTurns;
+  readonly imageUrl: TrackImageUrl;
+  readonly gameId: TrackGameId;
 
   private constructor(props: {
     id: string;
-    name: string;
-    shortName: string;
-    country: string;
+    name: TrackName;
+    shortName: TrackShortName;
+    country: TrackCountry;
     category: TrackCategory;
     difficulty: TrackDifficulty;
-    lengthKm: number;
-    turns: number;
-    imageUrl?: string | undefined;
-    gameId: string;
+    lengthKm: TrackLength;
+    turns: TrackTurns;
+    imageUrl: TrackImageUrl;
+    gameId: TrackGameId;
   }) {
     this.id = props.id;
     this.name = props.name;
@@ -62,66 +69,23 @@ export class Track implements IEntity<string> {
     imageUrl?: string;
     gameId: string;
   }): Track {
-    this.validate(props);
-
-    const base = {
-      id: props.id,
-      name: props.name,
-      shortName: props.shortName ?? props.name.slice(0, 3).toUpperCase(),
-      country: props.country,
-      category: props.category ?? 'road',
-      difficulty: props.difficulty ?? 'intermediate',
-      lengthKm: props.lengthKm,
-      turns: props.turns,
-      gameId: props.gameId,
-    };
-
-    const withImage =
-      props.imageUrl !== undefined ? { ...base, imageUrl: props.imageUrl } : base;
-
-    return new Track(withImage);
-  }
-
-  /**
-   * Domain validation logic
-   */
-  private static validate(props: {
-    id: string;
-    name: string;
-    country: string;
-    lengthKm: number;
-    turns: number;
-    gameId: string;
-  }): void {
     if (!props.id || props.id.trim().length === 0) {
       throw new RacingDomainValidationError('Track ID is required');
     }
 
-    if (!props.name || props.name.trim().length === 0) {
-      throw new RacingDomainValidationError('Track name is required');
-    }
+    const shortNameValue = props.shortName ?? props.name.slice(0, 3).toUpperCase();
 
-    if (!props.country || props.country.trim().length === 0) {
-      throw new RacingDomainValidationError('Track country is required');
-    }
-
-    if (props.lengthKm <= 0) {
-      throw new RacingDomainValidationError('Track length must be positive');
-    }
-
-    if (props.turns < 0) {
-      throw new RacingDomainValidationError('Track turns cannot be negative');
-    }
-
-    if (!props.gameId || props.gameId.trim().length === 0) {
-      throw new RacingDomainValidationError('Game ID is required');
-    }
-  }
-
-  /**
-   * Get formatted length string
-   */
-  getFormattedLength(): string {
-    return `${this.lengthKm.toFixed(2)} km`;
+    return new Track({
+      id: props.id,
+      name: TrackName.create(props.name),
+      shortName: TrackShortName.create(shortNameValue),
+      country: TrackCountry.create(props.country),
+      category: props.category ?? 'road',
+      difficulty: props.difficulty ?? 'intermediate',
+      lengthKm: TrackLength.create(props.lengthKm),
+      turns: TrackTurns.create(props.turns),
+      imageUrl: TrackImageUrl.create(props.imageUrl),
+      gameId: TrackGameId.create(props.gameId),
+    });
   }
 }

core/racing/domain/entities/VideoUrl.ts

@@ -0,0 +1,26 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class VideoUrl {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): VideoUrl {
+    if (!value || value.trim().length === 0) {
+      throw new RacingDomainValidationError('Video URL cannot be empty');
+    }
+    // Basic URL validation
+    try {
+      new URL(value);
+    } catch {
+      throw new RacingDomainValidationError('Invalid video URL format');
+    }
+    return new VideoUrl(value.trim());
+  }
+
+  toString(): string {
+    return this.value;
+  }
+
+  equals(other: VideoUrl): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/Weight.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class Weight {
+  private constructor(private readonly value: number) {}
+
+  static create(value: number): Weight {
+    if (value <= 0) {
+      throw new RacingDomainValidationError('Weight must be positive');
+    }
+    return new Weight(value);
+  }
+
+  toNumber(): number {
+    return this.value;
+  }
+
+  equals(other: Weight): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/Year.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export class Year {
+  private constructor(private readonly value: number) {}
+
+  static create(value: number): Year {
+    if (value < 1900 || value > new Date().getFullYear() + 1) {
+      throw new RacingDomainValidationError('Year must be between 1900 and next year');
+    }
+    return new Year(value);
+  }
+
+  toNumber(): number {
+    return this.value;
+  }
+
+  equals(other: Year): boolean {
+    return this.value === other.value;
+  }
+}

core/racing/domain/entities/championship/ChampionshipStanding.test.ts

@@ -0,0 +1,105 @@
+import { describe, it, expect } from 'vitest';
+import { ChampionshipStanding } from './ChampionshipStanding';
+import type { ParticipantRef } from '../../types/ParticipantRef';
+
+describe('ChampionshipStanding', () => {
+  const participant: ParticipantRef = { type: 'driver', id: 'driver1' };
+
+  it('should create a championship standing', () => {
+    const standing = ChampionshipStanding.create({
+      seasonId: 'season1',
+      championshipId: 'champ1',
+      participant,
+      totalPoints: 100,
+      resultsCounted: 5,
+      resultsDropped: 1,
+      position: 1,
+    });
+
+    expect(standing.id).toBe('season1-champ1-driver1');
+    expect(standing.seasonId).toBe('season1');
+    expect(standing.championshipId).toBe('champ1');
+    expect(standing.participant).toBe(participant);
+    expect(standing.totalPoints.toNumber()).toBe(100);
+    expect(standing.resultsCounted.toNumber()).toBe(5);
+    expect(standing.resultsDropped.toNumber()).toBe(1);
+    expect(standing.position.toNumber()).toBe(1);
+  });
+
+  it('should update position', () => {
+    const standing = ChampionshipStanding.create({
+      seasonId: 'season1',
+      championshipId: 'champ1',
+      participant,
+      totalPoints: 100,
+      resultsCounted: 5,
+      resultsDropped: 1,
+      position: 1,
+    });
+
+    const updated = standing.withPosition(2);
+    expect(updated.position.toNumber()).toBe(2);
+    expect(updated.id).toBe('season1-champ1-driver1');
+    expect(updated.totalPoints.toNumber()).toBe(100);
+  });
+
+  it('should throw on invalid seasonId', () => {
+    expect(() => ChampionshipStanding.create({
+      seasonId: '',
+      championshipId: 'champ1',
+      participant,
+      totalPoints: 100,
+      resultsCounted: 5,
+      resultsDropped: 1,
+      position: 1,
+    })).toThrow('Season ID is required');
+  });
+
+  it('should throw on invalid championshipId', () => {
+    expect(() => ChampionshipStanding.create({
+      seasonId: 'season1',
+      championshipId: '',
+      participant,
+      totalPoints: 100,
+      resultsCounted: 5,
+      resultsDropped: 1,
+      position: 1,
+    })).toThrow('Championship ID is required');
+  });
+
+  it('should throw on invalid participant', () => {
+    expect(() => ChampionshipStanding.create({
+      seasonId: 'season1',
+      championshipId: 'champ1',
+      participant: { type: 'driver', id: '' },
+      totalPoints: 100,
+      resultsCounted: 5,
+      resultsDropped: 1,
+      position: 1,
+    })).toThrow('Participant is required');
+  });
+
+  it('should throw on negative points', () => {
+    expect(() => ChampionshipStanding.create({
+      seasonId: 'season1',
+      championshipId: 'champ1',
+      participant,
+      totalPoints: -1,
+      resultsCounted: 5,
+      resultsDropped: 1,
+      position: 1,
+    })).toThrow('Points cannot be negative');
+  });
+
+  it('should throw on invalid position', () => {
+    expect(() => ChampionshipStanding.create({
+      seasonId: 'season1',
+      championshipId: 'champ1',
+      participant,
+      totalPoints: 100,
+      resultsCounted: 5,
+      resultsDropped: 1,
+      position: 0,
+    })).toThrow('Position must be a positive integer');
+  });
+});

core/racing/domain/entities/championship/ChampionshipStanding.ts

@@ -0,0 +1,69 @@
+import type { IEntity } from '@core/shared/domain';
+import { RacingDomainValidationError } from '../../errors/RacingDomainError';
+import type { ParticipantRef } from '../../types/ParticipantRef';
+import { Points } from '../../value-objects/Points';
+import { Position } from './Position';
+import { ResultsCount } from './ResultsCount';
+
+export class ChampionshipStanding implements IEntity<string> {
+  readonly id: string;
+  readonly seasonId: string;
+  readonly championshipId: string;
+  readonly participant: ParticipantRef;
+  readonly totalPoints: Points;
+  readonly resultsCounted: ResultsCount;
+  readonly resultsDropped: ResultsCount;
+  readonly position: Position;
+
+  private constructor(props: {
+    seasonId: string;
+    championshipId: string;
+    participant: ParticipantRef;
+    totalPoints: number;
+    resultsCounted: number;
+    resultsDropped: number;
+    position: number;
+  }) {
+    this.seasonId = props.seasonId;
+    this.championshipId = props.championshipId;
+    this.participant = props.participant;
+    this.totalPoints = Points.create(props.totalPoints);
+    this.resultsCounted = ResultsCount.create(props.resultsCounted);
+    this.resultsDropped = ResultsCount.create(props.resultsDropped);
+    this.position = Position.create(props.position);
+    this.id = `${this.seasonId}-${this.championshipId}-${this.participant.id}`;
+  }
+
+  static create(props: {
+    seasonId: string;
+    championshipId: string;
+    participant: ParticipantRef;
+    totalPoints: number;
+    resultsCounted: number;
+    resultsDropped: number;
+    position: number;
+  }): ChampionshipStanding {
+    if (!props.seasonId || props.seasonId.trim().length === 0) {
+      throw new RacingDomainValidationError('Season ID is required');
+    }
+    if (!props.championshipId || props.championshipId.trim().length === 0) {
+      throw new RacingDomainValidationError('Championship ID is required');
+    }
+    if (!props.participant || !props.participant.id || props.participant.id.trim().length === 0) {
+      throw new RacingDomainValidationError('Participant is required');
+    }
+    return new ChampionshipStanding(props);
+  }
+
+  withPosition(position: number): ChampionshipStanding {
+    return ChampionshipStanding.create({
+      seasonId: this.seasonId,
+      championshipId: this.championshipId,
+      participant: this.participant,
+      totalPoints: this.totalPoints.toNumber(),
+      resultsCounted: this.resultsCounted.toNumber(),
+      resultsDropped: this.resultsDropped.toNumber(),
+      position,
+    });
+  }
+}

core/racing/domain/entities/championship/Position.test.ts

@@ -0,0 +1,33 @@
+import { describe, it, expect } from 'vitest';
+import { Position } from './Position';
+
+describe('Position', () => {
+  it('should create position', () => {
+    const position = Position.create(1);
+    expect(position.toNumber()).toBe(1);
+  });
+
+  it('should not create zero position', () => {
+    expect(() => Position.create(0)).toThrow('Position must be a positive integer');
+  });
+
+  it('should not create negative position', () => {
+    expect(() => Position.create(-1)).toThrow('Position must be a positive integer');
+  });
+
+  it('should not create non-integer position', () => {
+    expect(() => Position.create(1.5)).toThrow('Position must be a positive integer');
+  });
+
+  it('should equal same position', () => {
+    const p1 = Position.create(2);
+    const p2 = Position.create(2);
+    expect(p1.equals(p2)).toBe(true);
+  });
+
+  it('should not equal different position', () => {
+    const p1 = Position.create(2);
+    const p2 = Position.create(3);
+    expect(p1.equals(p2)).toBe(false);
+  });
+});

core/racing/domain/entities/championship/Position.ts

@@ -0,0 +1,20 @@
+import { RacingDomainValidationError } from '../../errors/RacingDomainError';
+
+export class Position {
+  private constructor(private readonly value: number) {}
+
+  static create(value: number): Position {
+    if (!Number.isInteger(value) || value <= 0) {
+      throw new RacingDomainValidationError('Position must be a positive integer');
+    }
+    return new Position(value);
+  }
+
+  toNumber(): number {
+    return this.value;
+  }
+
+  equals(other: Position): boolean {
+    return this.value === other.value;
+  }
+}