Add issue change history and daily issue stats

Issue changes are recorded per field in the issue_change table, in the same
transaction as the issue itself. The new history module exposes:
- GET /api/issues/:issueId/history — change timeline grouped by save
- GET /api/issues/stats/daily — created, status transitions and status
  snapshot per day, with time zone support

The migration backfills history for existing issues. Setting a field to its
current value no longer bumps updatedAt or emits issue.updated.

prisma/migrations/20261007120000_issue_change/migration.sql

@@ -0,0 +1,28 @@
+-- CreateTable
+CREATE TABLE "issue_change" (
+    "id" SERIAL NOT NULL,
+    "issueId" INTEGER NOT NULL,
+    "changeId" TEXT NOT NULL,
+    "field" TEXT NOT NULL,
+    "oldValue" TEXT,
+    "newValue" TEXT,
+    "actorId" TEXT,
+    "changedAt" TIMESTAMPTZ(3) NOT NULL,
+
+    CONSTRAINT "issue_change_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "issue_change_issueId_changedAt_idx" ON "issue_change"("issueId", "changedAt");
+
+-- CreateIndex
+CREATE INDEX "issue_change_field_changedAt_idx" ON "issue_change"("field", "changedAt");
+
+-- CreateIndex
+CREATE INDEX "issue_change_actorId_idx" ON "issue_change"("actorId");
+
+-- AddForeignKey
+ALTER TABLE "issue_change" ADD CONSTRAINT "issue_change_issueId_fkey" FOREIGN KEY ("issueId") REFERENCES "issue"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "issue_change" ADD CONSTRAINT "issue_change_actorId_fkey" FOREIGN KEY ("actorId") REFERENCES "user"("id") ON DELETE SET NULL ON UPDATE CASCADE;

prisma/schema.prisma

@@ -26,6 +26,7 @@ model User {
   notificationMessages     NotificationMessage[]
   comments                 Comment[]
   uploadedFiles            File[]
+  issueChanges             IssueChange[]
 
   @@unique([email])
   @@map("user")
@@ -96,6 +97,7 @@ model Issue {
   dueDate     DateTime?         @db.Timestamptz(3)
   comments    Comment[]
   attachments IssueAttachment[]
+  changes     IssueChange[]
   createdAt   DateTime          @default(now()) @db.Timestamptz(3)
   updatedAt   DateTime          @updatedAt @db.Timestamptz(3)
 
@@ -264,3 +266,29 @@ model CommentAttachment {
   @@index([fileId])
   @@map("comment_attachment")
 }
+
+/// История изменений задачи — одна строка на изменённое поле.
+/// Строки одного сохранения задачи объединены общим changeId.
+/// field: created | title | content | status | priority | assignee | dueDate
+/// (валидируется в коде, см. ISSUE_CHANGE_FIELDS). Значения — строки:
+/// priority — число, dueDate — ISO-дата, assignee — id пользователя.
+/// При создании задачи пишутся две строки: created и status null -> OPEN,
+/// поэтому статус задачи на любой момент восстанавливается по строкам status.
+/// У задач, созданных до появления истории, строк нет — в статистику они не попадают.
+model IssueChange {
+  id        Int      @id @default(autoincrement())
+  issueId   Int
+  issue     Issue    @relation(fields: [issueId], references: [id], onDelete: Cascade)
+  changeId  String
+  field     String
+  oldValue  String?
+  newValue  String?
+  actorId   String?
+  actor     User?    @relation(fields: [actorId], references: [id], onDelete: SetNull)
+  changedAt DateTime @db.Timestamptz(3)
+
+  @@index([issueId, changedAt])
+  @@index([field, changedAt])
+  @@index([actorId])
+  @@map("issue_change")
+}

src/app.module.ts

@@ -9,6 +9,7 @@ import { NotificationModule } from './modules/notification/notification.module.j
 import { CommentModule } from './modules/comment/comment.module.js';
 import { FileModule } from './modules/file/file.module.js';
 import { IssueAttachmentModule } from './modules/issue-attachment/issue-attachment.module.js';
+import { HistoryModule } from './modules/history/history.module.js';
 import { AuthModule } from '@thallesp/nestjs-better-auth';
 import { auth } from './lib/auth.js';
 import { ConfigModule } from '@nestjs/config';
@@ -55,6 +56,7 @@ import { join } from 'node:path';
     CommentModule,
     FileModule,
     IssueAttachmentModule,
+    HistoryModule,
   ],
   controllers: [AppController],
   providers: [AppService],

src/modules/history/application/dto/daily-issue-stats.dto.ts

@@ -0,0 +1,22 @@
+import type { IssueStatusValue } from '../../../issue/domain/value-objects/issue-status.vo.js';
+
+/** Счётчик по каждому статусу; статусы без задач — 0 */
+export type IssueStatusCounts = Record<IssueStatusValue, number>;
+
+export class DailyIssueStatsDayDto {
+  /** YYYY-MM-DD в часовом поясе запроса */
+  date: string;
+  /** Создано задач за день */
+  created: number;
+  /** Переходов в статус за день (создание задачи в OPEN сюда не входит). transitions.DONE — выполнено за день */
+  transitions: IssueStatusCounts;
+  /** Задач в каждом статусе на конец дня */
+  byStatus: IssueStatusCounts;
+}
+
+export class DailyIssueStatsDto {
+  from: string;
+  to: string;
+  timeZone: string;
+  days: DailyIssueStatsDayDto[];
+}

src/modules/history/application/dto/issue-history.dto.ts

@@ -0,0 +1,21 @@
+import type { IssueChangeField } from '../../../issue/domain/entities/issue-change.js';
+import { UserDto } from '../../../user/application/dto/user.dto.js';
+
+export class IssueFieldChangeDto {
+  field: IssueChangeField;
+  oldValue: string | null;
+  newValue: string | null;
+  /** Только для field = assignee: пользователи из oldValue/newValue (null — не назначен или удалён) */
+  oldUser?: UserDto | null;
+  newUser?: UserDto | null;
+}
+
+/** Одно сохранение задачи: кто, когда и какие поля изменил */
+export class IssueHistoryEntryDto {
+  /** changeId */
+  id: string;
+  changedAt: Date;
+  actorId: string | null;
+  actor: UserDto | null;
+  changes: IssueFieldChangeDto[];
+}

src/modules/history/application/use-cases/get-daily-issue-stats/get-daily-issue-stats.query.ts

@@ -0,0 +1,12 @@
+export class GetDailyIssueStatsQuery {
+  constructor(
+    public readonly userId: string,
+    public readonly projectId?: string,
+    /** YYYY-MM-DD */
+    public readonly from?: string,
+    /** YYYY-MM-DD */
+    public readonly to?: string,
+    /** IANA, например Europe/Moscow */
+    public readonly timeZone?: string,
+  ) {}
+}

src/modules/history/application/use-cases/get-daily-issue-stats/get-daily-issue-stats.use-case.spec.ts

@@ -0,0 +1,77 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import type { IIssueHistoryRepository } from '../../../domain/repositories/issue-history.repository.interface.js';
+import { InvalidStatsPeriodException } from '../../../domain/exceptions/invalid-stats-period.exception.js';
+import { GetDailyIssueStatsUseCase } from './get-daily-issue-stats.use-case.js';
+import { GetDailyIssueStatsQuery } from './get-daily-issue-stats.query.js';
+
+const zero = { OPEN: 0, IN_PROGRESS: 0, DONE: 0, CANCELLED: 0 };
+
+describe('GetDailyIssueStatsUseCase', () => {
+  let repository: IIssueHistoryRepository;
+  let useCase: GetDailyIssueStatsUseCase;
+
+  beforeEach(() => {
+    repository = {
+      findByIssue: vi.fn(),
+      countDailyEvents: vi.fn().mockResolvedValue([]),
+      countDailyStatuses: vi.fn().mockResolvedValue([]),
+    };
+    useCase = new GetDailyIssueStatsUseCase(repository);
+  });
+
+  it('passes the validated period and visibility params to the repository', async () => {
+    await useCase.execute(
+      new GetDailyIssueStatsQuery('user-1', 'project-1', '2026-10-01', '2026-10-03', 'Europe/Moscow'),
+    );
+
+    const range = {
+      userId: 'user-1',
+      projectId: 'project-1',
+      from: '2026-10-01',
+      to: '2026-10-03',
+      timeZone: 'Europe/Moscow',
+    };
+    expect(repository.countDailyEvents).toHaveBeenCalledWith(range);
+    expect(repository.countDailyStatuses).toHaveBeenCalledWith(range);
+  });
+
+  it('fills every day and every status, including the empty ones', async () => {
+    vi.mocked(repository.countDailyEvents).mockResolvedValue([
+      { date: '2026-10-01', kind: 'created', count: 2 },
+      { date: '2026-10-03', kind: 'status', status: 'DONE', count: 1 },
+    ]);
+    vi.mocked(repository.countDailyStatuses).mockResolvedValue([
+      { date: '2026-10-01', status: 'OPEN', count: 2 },
+      { date: '2026-10-03', status: 'OPEN', count: 1 },
+      { date: '2026-10-03', status: 'DONE', count: 1 },
+    ]);
+
+    const result = await useCase.execute(new GetDailyIssueStatsQuery('user-1', undefined, '2026-10-01', '2026-10-03'));
+
+    expect(result).toEqual({
+      from: '2026-10-01',
+      to: '2026-10-03',
+      timeZone: 'UTC',
+      days: [
+        { date: '2026-10-01', created: 2, transitions: zero, byStatus: { ...zero, OPEN: 2 } },
+        { date: '2026-10-02', created: 0, transitions: zero, byStatus: zero },
+        { date: '2026-10-03', created: 0, transitions: { ...zero, DONE: 1 }, byStatus: { ...zero, OPEN: 1, DONE: 1 } },
+      ],
+    });
+  });
+
+  it('ignores statuses that are no longer known', async () => {
+    vi.mocked(repository.countDailyStatuses).mockResolvedValue([{ date: '2026-10-01', status: 'LEGACY', count: 5 }]);
+
+    const result = await useCase.execute(new GetDailyIssueStatsQuery('user-1', undefined, '2026-10-01', '2026-10-01'));
+
+    expect(result.days[0]!.byStatus).toEqual(zero);
+  });
+
+  it('rejects an invalid period without querying the database', async () => {
+    await expect(
+      useCase.execute(new GetDailyIssueStatsQuery('user-1', undefined, '2026-10-05', '2026-10-01')),
+    ).rejects.toThrow(InvalidStatsPeriodException);
+    expect(repository.countDailyEvents).not.toHaveBeenCalled();
+  });
+});

src/modules/history/application/use-cases/get-daily-issue-stats/get-daily-issue-stats.use-case.ts

@@ -0,0 +1,73 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { ISSUE_STATUSES, type IssueStatusValue } from '../../../../issue/domain/value-objects/issue-status.vo.js';
+import {
+  ISSUE_HISTORY_REPOSITORY,
+  type IIssueHistoryRepository,
+} from '../../../domain/repositories/issue-history.repository.interface.js';
+import { StatsPeriod } from '../../../domain/value-objects/stats-period.vo.js';
+import { DailyIssueStatsDayDto, DailyIssueStatsDto, IssueStatusCounts } from '../../dto/daily-issue-stats.dto.js';
+import { GetDailyIssueStatsQuery } from './get-daily-issue-stats.query.js';
+
+/**
+ * Статистика задач по дням, считается по истории изменений (issue_change).
+ * Видимость — как у списка задач: только задачи, где пользователь reporter/assignee.
+ */
+@Injectable()
+export class GetDailyIssueStatsUseCase {
+  constructor(
+    @Inject(ISSUE_HISTORY_REPOSITORY)
+    private readonly historyRepository: IIssueHistoryRepository,
+  ) {}
+
+  async execute(query: GetDailyIssueStatsQuery): Promise<DailyIssueStatsDto> {
+    const period = StatsPeriod.create({ from: query.from, to: query.to, timeZone: query.timeZone });
+    const range = {
+      userId: query.userId,
+      projectId: query.projectId,
+      from: period.from,
+      to: period.to,
+      timeZone: period.timeZone,
+    };
+
+    const [events, statuses] = await Promise.all([
+      this.historyRepository.countDailyEvents(range),
+      this.historyRepository.countDailyStatuses(range),
+    ]);
+
+    // Каждый день периода попадает в ответ, даже если в нём ничего не было
+    const days = new Map<string, DailyIssueStatsDayDto>(
+      period.days.map((date) => [
+        date,
+        { date, created: 0, transitions: emptyStatusCounts(), byStatus: emptyStatusCounts() },
+      ]),
+    );
+
+    for (const event of events) {
+      const day = days.get(event.date);
+      if (!day) continue;
+
+      if (event.kind === 'created') {
+        day.created += event.count;
+      } else if (isKnownStatus(event.status)) {
+        day.transitions[event.status] += event.count;
+      }
+    }
+
+    for (const entry of statuses) {
+      const day = days.get(entry.date);
+      if (day && isKnownStatus(entry.status)) {
+        day.byStatus[entry.status] += entry.count;
+      }
+    }
+
+    return { from: period.from, to: period.to, timeZone: period.timeZone, days: [...days.values()] };
+  }
+}
+
+function emptyStatusCounts(): IssueStatusCounts {
+  return Object.fromEntries(ISSUE_STATUSES.map((status) => [status.alias, 0])) as IssueStatusCounts;
+}
+
+function isKnownStatus(status: string): status is IssueStatusValue {
+  return ISSUE_STATUSES.some((known) => known.alias === status);
+}

src/modules/history/application/use-cases/get-issue-history/get-issue-history.query.ts

@@ -0,0 +1,6 @@
+export class GetIssueHistoryQuery {
+  constructor(
+    public readonly issueId: number,
+    public readonly userId: string,
+  ) {}
+}

src/modules/history/application/use-cases/get-issue-history/get-issue-history.use-case.spec.ts

@@ -0,0 +1,103 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import type {
+  IIssueHistoryRepository,
+  IssueChangeRecord,
+} from '../../../domain/repositories/issue-history.repository.interface.js';
+import type { IIssueRepository } from '../../../../issue/domain/repositories/issue.repository.interface.js';
+import { Issue } from '../../../../issue/domain/entities/issue.entity.js';
+import { IssueNotFoundException } from '../../../../issue/domain/exceptions/issue-not-found.exception.js';
+import type { GetUsersUseCase } from '../../../../user/application/use-cases/get-users/get-users.use-case.js';
+import type { UserDto } from '../../../../user/application/dto/user.dto.js';
+import { GetIssueHistoryUseCase } from './get-issue-history.use-case.js';
+import { GetIssueHistoryQuery } from './get-issue-history.query.js';
+
+const buildIssue = () =>
+  Issue.reconstitute({
+    id: 1,
+    key: 'ISSUE-1',
+    title: 'Title',
+    content: null,
+    status: 'OPEN',
+    priority: 0,
+    assignee: null,
+    reporter: 'user-1',
+    projectId: 'project-1',
+    dueDate: null,
+    createdAt: new Date('2026-10-01T00:00:00.000Z'),
+    updatedAt: new Date('2026-10-01T00:00:00.000Z'),
+  });
+
+const user = (id: string) => ({ id, name: id }) as UserDto;
+
+let nextId = 1;
+const record = (
+  props: Partial<IssueChangeRecord> & Pick<IssueChangeRecord, 'changeId' | 'field'>,
+): IssueChangeRecord => ({
+  id: nextId++,
+  issueId: 1,
+  oldValue: null,
+  newValue: null,
+  actorId: 'user-1',
+  changedAt: new Date('2026-10-01T00:00:00.000Z'),
+  ...props,
+});
+
+describe('GetIssueHistoryUseCase', () => {
+  let historyRepository: IIssueHistoryRepository;
+  let issueRepository: IIssueRepository;
+  let getUsersUseCase: GetUsersUseCase;
+  let useCase: GetIssueHistoryUseCase;
+
+  beforeEach(() => {
+    historyRepository = { findByIssue: vi.fn(), countDailyEvents: vi.fn(), countDailyStatuses: vi.fn() };
+    issueRepository = {
+      findById: vi.fn(),
+      findByCKey: vi.fn(),
+      findAll: vi.fn(),
+      countByStatus: vi.fn(),
+      create: vi.fn(),
+      update: vi.fn(),
+      delete: vi.fn(),
+    };
+    getUsersUseCase = {
+      execute: vi.fn(async (query: { ids: string[] }) => query.ids.filter((id) => id !== 'deleted').map(user)),
+    } as unknown as GetUsersUseCase;
+    useCase = new GetIssueHistoryUseCase(historyRepository, issueRepository, getUsersUseCase);
+  });
+
+  it('throws IssueNotFoundException when the issue is not visible to the user', async () => {
+    vi.mocked(issueRepository.findById).mockResolvedValue(null);
+
+    await expect(useCase.execute(new GetIssueHistoryQuery(1, 'user-9'))).rejects.toThrow(IssueNotFoundException);
+    expect(issueRepository.findById).toHaveBeenCalledWith(1, 'user-9');
+    expect(historyRepository.findByIssue).not.toHaveBeenCalled();
+  });
+
+  it('groups rows of one save into an entry and expands actors and assignees', async () => {
+    vi.mocked(issueRepository.findById).mockResolvedValue(buildIssue());
+    vi.mocked(historyRepository.findByIssue).mockResolvedValue([
+      record({ changeId: 'c1', field: 'created' }),
+      record({ changeId: 'c1', field: 'status', newValue: 'OPEN' }),
+      record({ changeId: 'c2', field: 'status', oldValue: 'OPEN', newValue: 'DONE', actorId: 'user-2' }),
+      record({ changeId: 'c2', field: 'assignee', oldValue: 'deleted', newValue: 'user-3', actorId: 'user-2' }),
+    ]);
+
+    const entries = await useCase.execute(new GetIssueHistoryQuery(1, 'user-1'));
+
+    expect(entries.map((entry) => [entry.id, entry.actor?.id, entry.changes.map((change) => change.field)])).toEqual([
+      ['c1', 'user-1', ['created', 'status']],
+      ['c2', 'user-2', ['status', 'assignee']],
+    ]);
+    expect(entries[1]!.changes[0]).toEqual({ field: 'status', oldValue: 'OPEN', newValue: 'DONE' });
+    expect(entries[1]!.changes[1]).toMatchObject({ oldUser: null, newUser: { id: 'user-3' } });
+    expect(getUsersUseCase.execute).toHaveBeenCalledTimes(1);
+  });
+
+  it('does not query users for an empty history', async () => {
+    vi.mocked(issueRepository.findById).mockResolvedValue(buildIssue());
+    vi.mocked(historyRepository.findByIssue).mockResolvedValue([]);
+
+    expect(await useCase.execute(new GetIssueHistoryQuery(1, 'user-1'))).toEqual([]);
+    expect(getUsersUseCase.execute).not.toHaveBeenCalled();
+  });
+});

src/modules/history/application/use-cases/get-issue-history/get-issue-history.use-case.ts

@@ -0,0 +1,83 @@
+import { Inject, Injectable } from '@nestjs/common';
+import {
+  ISSUE_REPOSITORY,
+  type IIssueRepository,
+} from '../../../../issue/domain/repositories/issue.repository.interface.js';
+import { IssueNotFoundException } from '../../../../issue/domain/exceptions/issue-not-found.exception.js';
+import { GetUsersUseCase } from '../../../../user/application/use-cases/get-users/get-users.use-case.js';
+import { GetUsersQuery } from '../../../../user/application/use-cases/get-users/get-users.query.js';
+import type { UserDto } from '../../../../user/application/dto/user.dto.js';
+import {
+  ISSUE_HISTORY_REPOSITORY,
+  type IIssueHistoryRepository,
+  type IssueChangeRecord,
+} from '../../../domain/repositories/issue-history.repository.interface.js';
+import { IssueFieldChangeDto, IssueHistoryEntryDto } from '../../dto/issue-history.dto.js';
+import { GetIssueHistoryQuery } from './get-issue-history.query.js';
+
+@Injectable()
+export class GetIssueHistoryUseCase {
+  constructor(
+    @Inject(ISSUE_HISTORY_REPOSITORY)
+    private readonly historyRepository: IIssueHistoryRepository,
+    @Inject(ISSUE_REPOSITORY)
+    private readonly issueRepository: IIssueRepository,
+    private readonly getUsersUseCase: GetUsersUseCase,
+  ) {}
+
+  async execute(query: GetIssueHistoryQuery): Promise<IssueHistoryEntryDto[]> {
+    const issue = await this.issueRepository.findById(query.issueId, query.userId);
+    if (!issue) {
+      throw new IssueNotFoundException(query.issueId);
+    }
+
+    const records = await this.historyRepository.findByIssue(query.issueId);
+    const usersById = await this.loadUsers(records);
+    const userOf = (id: string | null) => (id ? (usersById.get(id) ?? null) : null);
+
+    // Строки одного сохранения объединяются по changeId, порядок — по первой строке
+    const entries = new Map<string, IssueHistoryEntryDto>();
+    for (const record of records) {
+      let entry = entries.get(record.changeId);
+      if (!entry) {
+        entry = {
+          id: record.changeId,
+          changedAt: record.changedAt,
+          actorId: record.actorId,
+          actor: userOf(record.actorId),
+          changes: [],
+        };
+        entries.set(record.changeId, entry);
+      }
+
+      const change: IssueFieldChangeDto = {
+        field: record.field,
+        oldValue: record.oldValue,
+        newValue: record.newValue,
+      };
+      if (record.field === 'assignee') {
+        change.oldUser = userOf(record.oldValue);
+        change.newUser = userOf(record.newValue);
+      }
+      entry.changes.push(change);
+    }
+
+    return [...entries.values()];
+  }
+
+  /** Авторы изменений и назначенные/снятые исполнители */
+  private async loadUsers(records: IssueChangeRecord[]): Promise<Map<string, UserDto>> {
+    const ids = new Set<string>();
+    for (const record of records) {
+      if (record.actorId) ids.add(record.actorId);
+      if (record.field === 'assignee') {
+        if (record.oldValue) ids.add(record.oldValue);
+        if (record.newValue) ids.add(record.newValue);
+      }
+    }
+    if (ids.size === 0) return new Map();
+
+    const users = await this.getUsersUseCase.execute(new GetUsersQuery([...ids]));
+    return new Map(users.map((user) => [user.id, user]));
+  }
+}

src/modules/history/domain/exceptions/invalid-stats-period.exception.ts

@@ -0,0 +1,6 @@
+export class InvalidStatsPeriodException extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'InvalidStatsPeriodException';
+  }
+}

src/modules/history/domain/repositories/issue-history.repository.interface.ts

@@ -0,0 +1,46 @@
+import type { IssueChangeField } from '../../../issue/domain/entities/issue-change.js';
+
+/** DI-токен, т.к. интерфейсы стираются при компиляции TS */
+export const ISSUE_HISTORY_REPOSITORY = Symbol('ISSUE_HISTORY_REPOSITORY');
+
+/** Строка истории: изменение одного поля задачи (см. модель IssueChange) */
+export interface IssueChangeRecord {
+  id: number;
+  issueId: number;
+  /** Общий для всех полей, изменённых одним сохранением задачи */
+  changeId: string;
+  field: IssueChangeField;
+  oldValue: string | null;
+  newValue: string | null;
+  actorId: string | null;
+  changedAt: Date;
+}
+
+/** Период статистики: даты YYYY-MM-DD включительно, границы дней — в timeZone */
+export interface DailyStatsRange {
+  userId: string;
+  projectId?: string;
+  from: string;
+  to: string;
+  timeZone: string;
+}
+
+/** created — задачи, созданные за день; status — переходы в status за день (без начального OPEN) */
+export type DailyEventCount =
+  { date: string; kind: 'created'; count: number } | { date: string; kind: 'status'; status: string; count: number };
+
+/** Сколько задач было в статусе на конец дня */
+export interface DailyStatusCount {
+  date: string;
+  status: string;
+  count: number;
+}
+
+export interface IIssueHistoryRepository {
+  /** История задачи от старых изменений к новым */
+  findByIssue(issueId: number): Promise<IssueChangeRecord[]>;
+  /** Только задачи, видимые пользователю (reporter/assignee) */
+  countDailyEvents(range: DailyStatsRange): Promise<DailyEventCount[]>;
+  /** Только задачи, видимые пользователю (reporter/assignee) */
+  countDailyStatuses(range: DailyStatsRange): Promise<DailyStatusCount[]>;
+}

src/modules/history/domain/value-objects/stats-period.vo.spec.ts

@@ -0,0 +1,42 @@
+import { describe, expect, it } from 'vitest';
+import { StatsPeriod } from './stats-period.vo.js';
+import { InvalidStatsPeriodException } from '../exceptions/invalid-stats-period.exception.js';
+
+describe('StatsPeriod', () => {
+  const now = new Date('2026-10-07T22:30:00.000Z');
+
+  it('defaults to the last 30 days up to today in UTC', () => {
+    const period = StatsPeriod.create({}, now);
+
+    expect(period.from).toBe('2026-09-08');
+    expect(period.to).toBe('2026-10-07');
+    expect(period.timeZone).toBe('UTC');
+    expect(period.days).toHaveLength(30);
+  });
+
+  it('takes "today" in the requested time zone', () => {
+    // 22:30 UTC — в Москве уже 8 октября
+    expect(StatsPeriod.create({ timeZone: 'Europe/Moscow' }, now).to).toBe('2026-10-08');
+  });
+
+  it('lists every day of an explicit period inclusively', () => {
+    const period = StatsPeriod.create({ from: '2026-02-27', to: '2026-03-02' }, now);
+
+    expect(period.days).toEqual(['2026-02-27', '2026-02-28', '2026-03-01', '2026-03-02']);
+  });
+
+  it.each([
+    [{ from: '2026-10-05', to: '2026-10-01' }, 'from after to'],
+    [{ from: '2026-02-30' }, 'non-existent date'],
+    [{ to: '07.10.2026' }, 'wrong date format'],
+    [{ from: '2025-01-01', to: '2026-10-07' }, 'period too long'],
+    [{ timeZone: 'Mars/Olympus' }, 'unknown time zone'],
+    [{ timeZone: '+03:00' }, 'offset instead of IANA name'],
+  ] as const)('rejects %j (%s)', (params, _reason) => {
+    expect(() => StatsPeriod.create(params, now)).toThrow(InvalidStatsPeriodException);
+  });
+
+  it('accepts the maximum period length', () => {
+    expect(StatsPeriod.create({ from: '2025-10-07', to: '2026-10-07' }, now).days).toHaveLength(StatsPeriod.MAX_DAYS);
+  });
+});

src/modules/history/domain/value-objects/stats-period.vo.ts

@@ -0,0 +1,93 @@
+import { InvalidStatsPeriodException } from '../exceptions/invalid-stats-period.exception.js';
+
+const DATE_PATTERN = /^\d{4}-\d{2}-\d{2}$/;
+/**
+ * Только IANA-имена (Europe/Moscow, UTC). Смещения вида "+03:00" Intl понимает,
+ * а Postgres в AT TIME ZONE трактует по POSIX — с обратным знаком.
+ */
+const TIME_ZONE_PATTERN = /^[A-Za-z][A-Za-z0-9_+-]*(\/[A-Za-z0-9_+-]+)*$/;
+const DAY_MS = 24 * 60 * 60 * 1000;
+
+/**
+ * Период дневной статистики: from..to включительно (YYYY-MM-DD),
+ * границы дней считаются в часовом поясе timeZone.
+ */
+export class StatsPeriod {
+  static readonly MAX_DAYS = 366;
+  static readonly DEFAULT_DAYS = 30;
+
+  private constructor(
+    public readonly from: string,
+    public readonly to: string,
+    public readonly timeZone: string,
+  ) {}
+
+  /**
+   * Без to — сегодня в timeZone, без from — DEFAULT_DAYS дней до to.
+   * Без timeZone — UTC.
+   */
+  static create(params: { from?: string; to?: string; timeZone?: string }, now: Date = new Date()): StatsPeriod {
+    const timeZone = params.timeZone ?? 'UTC';
+    if (!isValidTimeZone(timeZone)) {
+      throw new InvalidStatsPeriodException(`Неизвестный часовой пояс: "${timeZone}"`);
+    }
+
+    const to = params.to !== undefined ? parseDate(params.to, 'to') : parseDate(todayIn(timeZone, now), 'to');
+    const from =
+      params.from !== undefined ? parseDate(params.from, 'from') : to - (StatsPeriod.DEFAULT_DAYS - 1) * DAY_MS;
+
+    if (from > to) {
+      throw new InvalidStatsPeriodException('Дата from позже даты to');
+    }
+
+    const days = (to - from) / DAY_MS + 1;
+    if (days > StatsPeriod.MAX_DAYS) {
+      throw new InvalidStatsPeriodException(`Период больше ${StatsPeriod.MAX_DAYS} дней`);
+    }
+
+    return new StatsPeriod(formatDate(from), formatDate(to), timeZone);
+  }
+
+  /** Все дни периода по порядку, YYYY-MM-DD */
+  get days(): string[] {
+    const days: string[] = [];
+    for (let day = Date.parse(this.from); day <= Date.parse(this.to); day += DAY_MS) {
+      days.push(formatDate(day));
+    }
+    return days;
+  }
+}
+
+function isValidTimeZone(timeZone: string): boolean {
+  if (!TIME_ZONE_PATTERN.test(timeZone)) return false;
+  try {
+    new Intl.DateTimeFormat('en-US', { timeZone });
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+/** YYYY-MM-DD → полночь UTC в мс; несуществующие даты (02-30) отклоняются */
+function parseDate(value: string, name: string): number {
+  const time = DATE_PATTERN.test(value) ? Date.parse(value) : NaN;
+  if (Number.isNaN(time) || formatDate(time) !== value) {
+    throw new InvalidStatsPeriodException(`Некорректная дата ${name}: "${value}", ожидается YYYY-MM-DD`);
+  }
+  return time;
+}
+
+function formatDate(time: number): string {
+  return new Date(time).toISOString().slice(0, 10);
+}
+
+function todayIn(timeZone: string, now: Date): string {
+  const parts = new Intl.DateTimeFormat('en-US', {
+    timeZone,
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+  }).formatToParts(now);
+  const part = (type: Intl.DateTimeFormatPartTypes) => parts.find((p) => p.type === type)?.value;
+  return `${part('year')}-${part('month')}-${part('day')}`;
+}

src/modules/history/history.module.ts

@@ -0,0 +1,30 @@
+import { Module } from '@nestjs/common';
+import { PrismaModule } from '../../common/prisma-adapter/prisma.module.js';
+import { IssueModule } from '../issue/issue.module.js';
+import { UserModule } from '../user/user.module.js';
+import { ISSUE_HISTORY_REPOSITORY } from './domain/repositories/issue-history.repository.interface.js';
+import { IssueHistoryPrismaRepository } from './infrastructure/persistence/prisma/repositories/issue-history.prisma-repository.js';
+import { HistoryController } from './presentation/controllers/history.controller.js';
+import { GetIssueHistoryUseCase } from './application/use-cases/get-issue-history/get-issue-history.use-case.js';
+import { GetDailyIssueStatsUseCase } from './application/use-cases/get-daily-issue-stats/get-daily-issue-stats.use-case.js';
+
+/**
+ * Чтение истории изменений задач и статистика по ней. Пишет историю
+ * issue-модуль (IssuePrismaRepository) — в одной транзакции с задачей;
+ * этот модуль от issue зависит, issue о нём не знает.
+ */
+@Module({
+  imports: [PrismaModule, IssueModule, UserModule],
+  controllers: [HistoryController],
+  providers: [
+    GetIssueHistoryUseCase,
+    GetDailyIssueStatsUseCase,
+    {
+      // Domain видит только интерфейс IIssueHistoryRepository,
+      // конкретную реализацию (Prisma) подставляет DI-контейнер здесь
+      provide: ISSUE_HISTORY_REPOSITORY,
+      useClass: IssueHistoryPrismaRepository,
+    },
+  ],
+})
+export class HistoryModule {}

src/modules/history/infrastructure/persistence/prisma/repositories/issue-history.prisma-repository.ts

@@ -0,0 +1,89 @@
+import { Injectable } from '@nestjs/common';
+import { PrismaAdapter } from '../../../../../../common/prisma-adapter/prisma.adapter.js';
+import { Prisma } from '../../../../../../generated/prisma/client.js';
+import type { IssueChangeField } from '../../../../../issue/domain/entities/issue-change.js';
+import type {
+  DailyEventCount,
+  DailyStatsRange,
+  DailyStatusCount,
+  IIssueHistoryRepository,
+  IssueChangeRecord,
+} from '../../../../domain/repositories/issue-history.repository.interface.js';
+
+/**
+ * Задачи, видимые пользователю: reporter или assignee — то же правило, что
+ * ownedByUser в IssuePrismaRepository. Возвращает CTE "visible" (id задач).
+ */
+function visibleIssuesCte(range: DailyStatsRange): Prisma.Sql {
+  return Prisma.sql`"visible" AS (
+    SELECT "id" FROM "issue"
+    WHERE ("assigneeId" = ${range.userId} OR "reporterId" = ${range.userId})
+    ${range.projectId ? Prisma.sql`AND "projectId" = ${range.projectId}` : Prisma.empty}
+  )`;
+}
+
+@Injectable()
+export class IssueHistoryPrismaRepository implements IIssueHistoryRepository {
+  constructor(private readonly prisma: PrismaAdapter) {}
+
+  async findByIssue(issueId: number): Promise<IssueChangeRecord[]> {
+    const records = await this.prisma.issueChange.findMany({
+      where: { issueId },
+      orderBy: [{ changedAt: 'asc' }, { id: 'asc' }],
+    });
+
+    return records.map((record) => ({ ...record, field: record.field as IssueChangeField }));
+  }
+
+  async countDailyEvents(range: DailyStatsRange): Promise<DailyEventCount[]> {
+    const rows = await this.prisma.$queryRaw<
+      Array<{ date: string; field: string; status: string | null; count: number }>
+    >`
+      WITH ${visibleIssuesCte(range)}
+      SELECT to_char((c."changedAt" AT TIME ZONE ${range.timeZone})::date, 'YYYY-MM-DD') AS "date",
+             c."field",
+             c."newValue" AS "status",
+             count(*)::int AS "count"
+      FROM "issue_change" c
+      JOIN "visible" v ON v."id" = c."issueId"
+      WHERE (c."field" = 'created' OR (c."field" = 'status' AND c."oldValue" IS NOT NULL))
+        AND c."changedAt" >= (${range.from}::date)::timestamp AT TIME ZONE ${range.timeZone}
+        AND c."changedAt" < (${range.to}::date + 1)::timestamp AT TIME ZONE ${range.timeZone}
+      GROUP BY 1, 2, 3
+    `;
+
+    return rows.map((row) =>
+      row.field === 'created'
+        ? { date: row.date, kind: 'created', count: row.count }
+        : { date: row.date, kind: 'status', status: row.status as string, count: row.count },
+    );
+  }
+
+  /**
+   * Статус задачи на конец дня — последний переход строго до полуночи
+   * следующего дня. Переходы превращаются в интервалы [validFrom, validTo),
+   * день засчитывается интервалу, который покрывает его конец.
+   */
+  async countDailyStatuses(range: DailyStatsRange): Promise<DailyStatusCount[]> {
+    return this.prisma.$queryRaw<DailyStatusCount[]>`
+      WITH ${visibleIssuesCte(range)},
+      "days" AS (
+        SELECT d::date AS "day",
+               (d::date + 1)::timestamp AT TIME ZONE ${range.timeZone} AS "dayEnd"
+        FROM generate_series(${range.from}::date, ${range.to}::date, interval '1 day') AS d
+      ),
+      "intervals" AS (
+        SELECT c."newValue" AS "status",
+               c."changedAt" AS "validFrom",
+               lead(c."changedAt") OVER (PARTITION BY c."issueId" ORDER BY c."changedAt", c."id") AS "validTo"
+        FROM "issue_change" c
+        JOIN "visible" v ON v."id" = c."issueId"
+        WHERE c."field" = 'status'
+      )
+      SELECT to_char(d."day", 'YYYY-MM-DD') AS "date", i."status", count(*)::int AS "count"
+      FROM "days" d
+      JOIN "intervals" i ON i."validFrom" < d."dayEnd" AND (i."validTo" IS NULL OR i."validTo" >= d."dayEnd")
+      GROUP BY d."day", i."status"
+    `;
+  }
+}

src/modules/history/presentation/controllers/history.controller.ts

@@ -0,0 +1,50 @@
+import { BadRequestException, Controller, Get, NotFoundException, Param, ParseIntPipe, Query } from '@nestjs/common';
+import { Session, type UserSession } from '@thallesp/nestjs-better-auth';
+import { GetIssueHistoryUseCase } from '../../application/use-cases/get-issue-history/get-issue-history.use-case.js';
+import { GetIssueHistoryQuery } from '../../application/use-cases/get-issue-history/get-issue-history.query.js';
+import { GetDailyIssueStatsUseCase } from '../../application/use-cases/get-daily-issue-stats/get-daily-issue-stats.use-case.js';
+import { GetDailyIssueStatsQuery } from '../../application/use-cases/get-daily-issue-stats/get-daily-issue-stats.query.js';
+import { DailyIssueStatsQueryDto } from '../dto/daily-issue-stats-query.dto.js';
+import { IssueNotFoundException } from '../../../issue/domain/exceptions/issue-not-found.exception.js';
+import { InvalidStatsPeriodException } from '../../domain/exceptions/invalid-stats-period.exception.js';
+
+@Controller('issues')
+export class HistoryController {
+  constructor(
+    private readonly getIssueHistoryUseCase: GetIssueHistoryUseCase,
+    private readonly getDailyIssueStatsUseCase: GetDailyIssueStatsUseCase,
+  ) {}
+
+  /** Статистика по дням: создано, переходы между статусами и срез статусов на конец дня */
+  @Get('stats/daily')
+  dailyStats(@Query() query: DailyIssueStatsQueryDto, @Session() session: UserSession) {
+    return this.handleErrors(() =>
+      this.getDailyIssueStatsUseCase.execute(
+        new GetDailyIssueStatsQuery(session.user.id, query.projectId, query.from, query.to, query.timeZone),
+      ),
+    );
+  }
+
+  /** История изменений задачи от старых к новым, одна запись на сохранение */
+  @Get(':issueId/history')
+  history(@Param('issueId', ParseIntPipe) issueId: number, @Session() session: UserSession) {
+    return this.handleErrors(() =>
+      this.getIssueHistoryUseCase.execute(new GetIssueHistoryQuery(issueId, session.user.id)),
+    );
+  }
+
+  /** Транслирует доменные исключения в HTTP-ответ — это забота presentation-слоя */
+  private async handleErrors<T>(fn: () => Promise<T>): Promise<T> {
+    try {
+      return await fn();
+    } catch (error) {
+      if (error instanceof IssueNotFoundException) {
+        throw new NotFoundException(error.message);
+      }
+      if (error instanceof InvalidStatsPeriodException) {
+        throw new BadRequestException(error.message);
+      }
+      throw error;
+    }
+  }
+}

src/modules/history/presentation/dto/daily-issue-stats-query.dto.ts

@@ -0,0 +1,18 @@
+import { StringDecorator } from '../../../../common/decorators/validators.js';
+
+export class DailyIssueStatsQueryDto {
+  @StringDecorator({ isOptional: true })
+  projectId?: string;
+
+  /** YYYY-MM-DD, по умолчанию — 30 дней до to */
+  @StringDecorator({ isOptional: true })
+  from?: string;
+
+  /** YYYY-MM-DD включительно, по умолчанию — сегодня в timeZone */
+  @StringDecorator({ isOptional: true })
+  to?: string;
+
+  /** IANA-имя, например Europe/Moscow; по умолчанию UTC */
+  @StringDecorator({ isOptional: true })
+  timeZone?: string;
+}

src/modules/issue/application/use-cases/update-issue/update-issue.use-case.spec.ts

@@ -72,6 +72,14 @@ describe('UpdateIssueUseCase', () => {
     expect(repository.update).toHaveBeenCalledTimes(1);
   });
 
+  it('passes the acting user to the repository as the author of the changes', async () => {
+    vi.mocked(repository.findById).mockResolvedValue(buildIssue());
+
+    await useCase.execute(new UpdateIssueCommand(1, 'user-7', undefined, undefined, 'DONE'));
+
+    expect(repository.update).toHaveBeenCalledWith(expect.any(Issue), 'user-7');
+  });
+
   it('assigns and unassigns depending on the assignee value', async () => {
     vi.mocked(repository.findById).mockResolvedValue(buildIssue());
 

src/modules/issue/application/use-cases/update-issue/update-issue.use-case.ts

@@ -57,7 +57,7 @@ export class UpdateIssueUseCase {
       issue.updateDueDate(command.dueDate);
     }
 
-    await this.issueRepository.update(issue);
+    await this.issueRepository.update(issue, command.userId);
     const dto = await this.issueUserExpander.expand(issue);
 
     if (issue.assignee) {

src/modules/issue/domain/entities/issue-change.ts

@@ -0,0 +1,25 @@
+/**
+ * Поля задачи, изменения которых пишутся в историю (таблица issue_change).
+ * created — служебное «поле»: строка о создании задачи, значения пустые.
+ */
+export const ISSUE_CHANGE_FIELDS = [
+  'created',
+  'title',
+  'content',
+  'status',
+  'priority',
+  'assignee',
+  'dueDate',
+] as const;
+
+export type IssueChangeField = (typeof ISSUE_CHANGE_FIELDS)[number];
+
+/**
+ * Изменение одного поля задачи. Значения сериализованы в строки:
+ * priority — число, dueDate — ISO-дата, assignee — id пользователя.
+ */
+export interface IssueFieldChange {
+  field: IssueChangeField;
+  oldValue: string | null;
+  newValue: string | null;
+}

src/modules/issue/domain/entities/issue.entity.spec.ts

@@ -148,4 +148,76 @@ describe('Issue', () => {
       expect(issue.assignee).toBeNull();
     });
   });
+
+  describe('change tracking', () => {
+    const build = () =>
+      Issue.reconstitute({
+        id: 1,
+        key: 'ISSUE-1',
+        title: 'Title',
+        content: null,
+        status: 'OPEN',
+        priority: 0,
+        assignee: null,
+        reporter: 'user-1',
+        projectId: 'project-1',
+        dueDate: null,
+        createdAt: new Date('2026-01-01T00:00:00.000Z'),
+        updatedAt: new Date('2026-01-01T00:00:00.000Z'),
+      });
+
+    it('records creation and the initial OPEN status for a new issue', () => {
+      const issue = Issue.create({ key: 'ISSUE-1', title: 'Title', reporter: 'user-1', projectId: 'project-1' });
+
+      expect(issue.pullChanges()).toEqual([
+        { field: 'created', oldValue: null, newValue: null },
+        { field: 'status', oldValue: null, newValue: 'OPEN' },
+      ]);
+    });
+
+    it('records every changed field with serialized values', () => {
+      const issue = build();
+
+      issue.updateTitle('New title');
+      issue.updateContent('Text');
+      issue.changeStatus('IN_PROGRESS');
+      issue.changePriority(3);
+      issue.assignTo('user-2');
+      issue.updateDueDate(new Date('2026-02-01T00:00:00.000Z'));
+
+      expect(issue.pullChanges()).toEqual([
+        { field: 'title', oldValue: 'Title', newValue: 'New title' },
+        { field: 'content', oldValue: null, newValue: 'Text' },
+        { field: 'status', oldValue: 'OPEN', newValue: 'IN_PROGRESS' },
+        { field: 'priority', oldValue: '0', newValue: '3' },
+        { field: 'assignee', oldValue: null, newValue: 'user-2' },
+        { field: 'dueDate', oldValue: null, newValue: '2026-02-01T00:00:00.000Z' },
+      ]);
+      expect(issue.pullChanges()).toEqual([]);
+    });
+
+    it('ignores setting the same value: no change, no event, no updatedAt bump', () => {
+      const issue = build();
+      const before = issue.updatedAt;
+
+      issue.updateTitle('Title');
+      issue.changeStatus('OPEN');
+      issue.unassign();
+
+      expect(issue.pullChanges()).toEqual([]);
+      expect(issue.pullDomainEvents()).toEqual([]);
+      expect(issue.updatedAt).toBe(before);
+    });
+
+    it('merges repeated changes of a field and drops a change reverted to the original', () => {
+      const issue = build();
+
+      issue.changeStatus('IN_PROGRESS');
+      issue.changeStatus('DONE');
+      issue.assignTo('user-2');
+      issue.unassign();
+
+      expect(issue.pullChanges()).toEqual([{ field: 'status', oldValue: 'OPEN', newValue: 'DONE' }]);
+    });
+  });
 });

src/modules/issue/domain/entities/issue.entity.ts

@@ -3,6 +3,7 @@ import { IssueStatus } from '../value-objects/issue-status.vo.js';
 import { IssuePriority } from '../value-objects/issue-priority.vo.js';
 import { IssueCreatedEvent } from '../events/issue-created.event.js';
 import { IssueUpdatedEvent } from '../events/issue-updated.event.js';
+import type { IssueChangeField, IssueFieldChange } from './issue-change.js';
 
 interface IssueProps {
   id: number | null;
@@ -27,9 +28,14 @@ interface IssueProps {
  * `id` — Int, генерируется базой данных (SERIAL), поэтому у новой задачи
  * он равен null до сохранения в репозитории. `key` (например, "ISSUE-1")
  * присваивается на уровне приложения при создании и не зависит от id.
+ *
+ * Сущность копит изменения полей (pullChanges) — репозиторий сохраняет их
+ * в историю в той же транзакции, что и саму задачу.
  */
 export class Issue {
   private domainEvents: unknown[] = [];
+  /** Несохранённые изменения полей, по одному на поле, в порядке изменения */
+  private changes = new Map<IssueChangeField, IssueFieldChange>();
 
   private constructor(private readonly props: IssueProps) {}
 
@@ -59,6 +65,8 @@ export class Issue {
       updatedAt: new Date(),
     });
 
+    issue.changes.set('created', { field: 'created', oldValue: null, newValue: null });
+    issue.changes.set('status', { field: 'status', oldValue: null, newValue: issue.status });
     issue.addDomainEvent(new IssueCreatedEvent(issue.key));
 
     return issue;
@@ -144,37 +152,67 @@ export class Issue {
   }
 
   updateTitle(title: string): void {
-    this.props.title = IssueTitle.create(title);
+    const next = IssueTitle.create(title);
-    this.touch();
+    this.recordChange('title', this.title, next.value);
+    this.props.title = next;
   }
 
   updateContent(content: string | null): void {
+    this.recordChange('content', this.content, content);
     this.props.content = content;
-    this.touch();
   }
 
   changeStatus(status: string): void {
-    this.props.status = IssueStatus.create(status);
+    const next = IssueStatus.create(status);
-    this.touch();
+    this.recordChange('status', this.status, next.value);
+    this.props.status = next;
   }
 
   changePriority(priority: number): void {
-    this.props.priority = IssuePriority.create(priority);
+    const next = IssuePriority.create(priority);
-    this.touch();
+    this.recordChange('priority', String(this.priority), String(next.value));
+    this.props.priority = next;
   }
 
   assignTo(userId: string): void {
+    this.recordChange('assignee', this.assignee, userId);
     this.props.assignee = userId;
-    this.touch();
   }
 
   unassign(): void {
+    this.recordChange('assignee', this.assignee, null);
     this.props.assignee = null;
-    this.touch();
   }
 
   updateDueDate(dueDate: Date | null): void {
+    this.recordChange('dueDate', this.dueDate?.toISOString() ?? null, dueDate?.toISOString() ?? null);
     this.props.dueDate = dueDate;
+  }
+
+  /** Изменения полей, накопленные с момента загрузки/создания. Забираются один раз. */
+  pullChanges(): IssueFieldChange[] {
+    const changes = [...this.changes.values()];
+    this.changes.clear();
+    return changes;
+  }
+
+  /**
+   * Запоминает изменение поля. Присвоение того же значения — не изменение:
+   * ни updatedAt, ни событие, ни запись в историю. Повторная правка поля
+   * сливается с предыдущей, а возврат к исходному значению её отменяет.
+   */
+  private recordChange(field: IssueChangeField, oldValue: string | null, newValue: string | null): void {
+    if (oldValue === newValue) return;
+
+    const pending = this.changes.get(field);
+    if (!pending) {
+      this.changes.set(field, { field, oldValue, newValue });
+    } else if (pending.oldValue === newValue) {
+      this.changes.delete(field);
+    } else {
+      pending.newValue = newValue;
+    }
+
     this.touch();
   }
 

src/modules/issue/domain/repositories/issue.repository.interface.ts

@@ -18,7 +18,9 @@ export interface IIssueRepository {
     projectId?: string;
   }): Promise<{ list: Issue[]; meta: PaginationMeta }>;
   countByStatus(userId: string, projectId?: string): Promise<Array<{ status: string; count: number }>>;
+  /** Сохраняет задачу и записи о её создании в историю (автор — reporter) */
   create(issue: Issue): Promise<Issue>;
-  update(issue: Issue): Promise<void>;
+  /** Сохраняет задачу и накопленные изменения полей в историю одной транзакцией */
+  update(issue: Issue, actorId: string): Promise<void>;
   delete(id: number): Promise<void>;
 }

src/modules/issue/infrastructure/persistence/prisma/repositories/issue.prisma-repository.ts

@@ -1,3 +1,4 @@
+import { randomUUID } from 'node:crypto';
 import { Injectable } from '@nestjs/common';
 import { PrismaAdapter } from '../../../../../../common/prisma-adapter/prisma.adapter.js';
 import { Issue } from '../../../../domain/entities/issue.entity.js';
@@ -8,6 +9,7 @@ import { PaginationMeta } from '../../../../../../common/interfaces/pagination-m
 import { splitCKey } from '../../../../domain/helpers/get-ckey.js';
 import { Prisma } from '../../../../../../generated/prisma/client.js';
 import { IssueProjectNotFoundException } from '../../../../domain/exceptions/issue-project-not-found.exception.js';
+import type { IssueFieldChange } from '../../../../domain/entities/issue-change.js';
 
 const FOREIGN_KEY_VIOLATION = 'P2003';
 
@@ -16,6 +18,17 @@ function ownedByUser(userId: string) {
   return [{ assigneeId: userId }, { reporterId: userId }];
 }
 
+/** Строки истории одного сохранения задачи — с общим changeId */
+function toChangeRows(
+  issueId: number,
+  changes: IssueFieldChange[],
+  actorId: string | null,
+  changedAt: Date,
+): Prisma.IssueChangeCreateManyInput[] {
+  const changeId = randomUUID();
+  return changes.map((change) => ({ issueId, changeId, actorId, changedAt, ...change }));
+}
+
 @Injectable()
 export class IssuePrismaRepository implements IIssueRepository {
   constructor(private readonly prisma: PrismaAdapter) {}
@@ -96,10 +109,18 @@ export class IssuePrismaRepository implements IIssueRepository {
   }
 
   async create(issue: Issue): Promise<Issue> {
+    const changes = issue.pullChanges();
+
     try {
-      const record = await this.prisma.issue.create({
+      const record = await this.prisma.$transaction(async (tx) => {
+        const created = await tx.issue.create({
           data: IssuePrismaMapper.toCreateInput(issue),
         });
+        await tx.issueChange.createMany({
+          data: toChangeRows(created.id, changes, issue.reporter, issue.createdAt),
+        });
+        return created;
+      });
 
       return IssuePrismaMapper.toDomain(record);
     } catch (error) {
@@ -110,11 +131,26 @@ export class IssuePrismaRepository implements IIssueRepository {
     }
   }
 
-  async update(issue: Issue): Promise<void> {
+  async update(issue: Issue, actorId: string): Promise<void> {
-    await this.prisma.issue.update({
+    const issueId = issue.id as number;
-      where: { id: issue.id as number },
+    const changes = issue.pullChanges();
+
+    const updateIssue = this.prisma.issue.update({
+      where: { id: issueId },
       data: IssuePrismaMapper.toUpdateInput(issue),
     });
+
+    if (changes.length === 0) {
+      await updateIssue;
+      return;
+    }
+
+    await this.prisma.$transaction([
+      updateIssue,
+      this.prisma.issueChange.createMany({
+        data: toChangeRows(issueId, changes, actorId, issue.updatedAt),
+      }),
+    ]);
   }
 
   async delete(id: number): Promise<void> {