feat: link commits, branches and pull requests to tickets

A project can turn on a webhook for GitHub, Gitea or GitLab. Pushes and
pull or merge requests that name a ticket key show on that ticket under
Desarrollo, with the state of each pull request; the secret is shown and
rotated from the project settings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/domain/src/index.ts

@@ -7,6 +7,7 @@ export * from './lib/issue/mentions';
 export * from './lib/issue/issue-hierarchy';
 export * from './lib/issue/issue-checklist';
 export * from './lib/issue/issue-rank';
+export * from './lib/issue/dev-link';
 export * from './lib/project/project-settings';
 export * from './lib/comment/comment';
 export * from './lib/release/release';

libs/api/tracker/domain/src/lib/events/index.ts

@@ -38,3 +38,4 @@ export * from './sprint-closed.event';
 export * from './sprint-deleted.event';
 export * from './issue-sprint-changed.event';
 export * from './release-notes-written.event';
+export * from './issue-dev-link-recorded.event';

libs/api/tracker/domain/src/lib/events/issue-dev-link-recorded.event.ts

@@ -0,0 +1,16 @@
+import { AutowiredEvent } from '@task-stream/api/shared/domain';
+import { DevLink } from '../issue/dev-link';
+import { TrackerEvent } from './tracker.event';
+
+/** Code mentioning the ticket was pushed, or a pull request changed state. */
+@AutowiredEvent
+export class IssueDevLinkRecordedEvent extends TrackerEvent {
+  constructor(
+    actorId: string,
+    issueId: string,
+    projectId: string,
+    readonly link: DevLink,
+  ) {
+    super(actorId, issueId, projectId);
+  }
+}

libs/api/tracker/domain/src/lib/issue/dev-link.spec.ts

@@ -0,0 +1,48 @@
+import { IssueFactory } from '../factories/issue.factory';
+import { replay } from '../testing';
+import { DevLinkKind, DevLinkState, issueKeysIn } from './dev-link';
+import { Issue } from './issue';
+import { IssueType } from './issue.enums';
+
+const pr = (state: DevLinkState, title = 'WEB-7: pay by card') => ({
+  kind: DevLinkKind.PULL_REQUEST,
+  url: 'https://git.example.org/acme/web/pulls/12',
+  title,
+  ref: '#12',
+  state,
+  provider: 'gitea',
+  author: 'ana',
+  at: '2026-10-08T10:00:00Z',
+});
+
+describe('dev links', () => {
+  it('finds the keys of a project in commit messages and branch names', () => {
+    expect(
+      issueKeysIn(
+        'fix(web-7): pay; refs WEB-7, WEB-12 and API-3 (WEB-120x)',
+        'WEB',
+      ),
+    ).toEqual(['WEB-7', 'WEB-12']);
+    expect(issueKeysIn('feature/web-31-checkout', 'WEB')).toEqual(['WEB-31']);
+    expect(issueKeysIn('NEWWEB-4', 'WEB')).toEqual([]);
+  });
+
+  it('records a pull request once per change of state', () => {
+    const issue = new IssueFactory().create({
+      projectId: 'p',
+      projectKey: 'WEB',
+      number: 7,
+      title: 'Pay',
+      type: IssueType.FEATURE,
+      reporterId: 'u',
+    });
+    issue.recordDevLink('system', pr(DevLinkState.OPEN));
+    issue.recordDevLink('system', pr(DevLinkState.OPEN));
+    issue.recordDevLink('system', pr(DevLinkState.MERGED));
+
+    expect(issue.getUncommittedEvents()).toHaveLength(3); // created + 2
+    expect(replay(issue, Issue).rebuilt.devLinks).toEqual([
+      expect.objectContaining({ state: DevLinkState.MERGED }),
+    ]);
+  });
+});

libs/api/tracker/domain/src/lib/issue/dev-link.ts

@@ -0,0 +1,60 @@
+import { assertThat } from '@task-stream/api/shared/domain';
+
+export enum DevLinkKind {
+  COMMIT = 'COMMIT',
+  BRANCH = 'BRANCH',
+  PULL_REQUEST = 'PULL_REQUEST',
+}
+
+export enum DevLinkState {
+  OPEN = 'OPEN',
+  MERGED = 'MERGED',
+  CLOSED = 'CLOSED',
+}
+
+/**
+ * Code that mentions a ticket: a commit, a branch or a pull/merge request,
+ * as the Git host reported it. The URL identifies it.
+ */
+export interface DevLink {
+  kind: DevLinkKind;
+  url: string;
+  /** Commit message's first line, branch name or PR title. */
+  title: string;
+  /** Short SHA, branch or PR number. */
+  ref: string;
+  /** Pull requests only. */
+  state: DevLinkState | null;
+  /** github, gitea, gitlab. */
+  provider: string;
+  author: string | null;
+  at: string;
+}
+
+/** A ticket keeps the last this-many pieces of code. */
+export const MAX_DEV_LINKS = 100;
+
+/** Ticket keys of a project mentioned in a text (WEB-12, web-12), once each. */
+export function issueKeysIn(text: string, projectKey: string): string[] {
+  const pattern = new RegExp(
+    `(?<![A-Za-z0-9])${projectKey}-(\\d+)(?![A-Za-z0-9])`,
+    'gi',
+  );
+  return [
+    ...new Set(
+      [...text.matchAll(pattern)].map(
+        (m) => `${projectKey.toUpperCase()}-${m[1]}`,
+      ),
+    ),
+  ];
+}
+
+export function normalizeDevLink(link: DevLink): DevLink {
+  assertThat(/^https?:\/\//.test(link.url), 'A dev link needs an http(s) URL');
+  return {
+    ...link,
+    title: link.title.split('\n')[0].trim().slice(0, 200) || link.ref,
+    ref: link.ref.slice(0, 120),
+    author: link.author?.slice(0, 120) ?? null,
+  };
+}

libs/api/tracker/domain/src/lib/issue/issue.ts

@@ -14,6 +14,7 @@ import { IssueCreatedEvent } from '../events/issue-created.event';
 import { IssueDeletedEvent } from '../events/issue-deleted.event';
 import { IssueLinkedEvent } from '../events/issue-linked.event';
 import { IssueParentChangedEvent } from '../events/issue-parent-changed.event';
+import { IssueDevLinkRecordedEvent } from '../events/issue-dev-link-recorded.event';
 import { IssueRankedEvent } from '../events/issue-ranked.event';
 import { IssueReleaseChangedEvent } from '../events/issue-release-changed.event';
 import { IssueSprintChangedEvent } from '../events/issue-sprint-changed.event';
@@ -34,6 +35,7 @@ import {
   normalizeChecklistText,
 } from './issue-checklist';
 import { ParentCandidate, assertCanNest } from './issue-hierarchy';
+import { DevLink, MAX_DEV_LINKS, normalizeDevLink } from './dev-link';
 import { implicitRank, rankBetween } from './issue-rank';
 import { IssueLinkType, IssuePriority } from './issue.enums';
 
@@ -118,6 +120,8 @@ export class Issue extends VersionedAggregateRoot implements IssueProps {
   /** Place in the backlog once someone moved it (see `backlogRank`). */
   public rank: string | null = null;
   public sprintId: string | null = null;
+  /** Commits, branches and pull requests that mention it. */
+  public devLinks: DevLink[] = [];
   public createdAt!: string;
   public updatedAt!: string;
   public deleted = false;
@@ -264,6 +268,20 @@ export class Issue extends VersionedAggregateRoot implements IssueProps {
     );
   }
 
+  /**
+   * Records code that mentions the ticket. The same URL again only counts
+   * when something changed (a pull request merged, a title edited).
+   */
+  recordDevLink(actorId: string, link: DevLink): void {
+    const next = normalizeDevLink(link);
+    const known = this.devLinks.find((l) => l.url === next.url);
+    if (known && known.state === next.state && known.title === next.title)
+      return;
+    this.apply(
+      new IssueDevLinkRecordedEvent(actorId, this.id, this.projectId, next),
+    );
+  }
+
   /** Moves the ticket in or out of a sprint (null: back to the backlog). */
   setSprint(actorId: string, sprintId: string | null): void {
     if (this.sprintId === sprintId) return;
@@ -551,6 +569,13 @@ export class Issue extends VersionedAggregateRoot implements IssueProps {
     this.deleted = true;
   }
 
+  onIssueDevLinkRecordedEvent(event: IssueDevLinkRecordedEvent): void {
+    this.devLinks = [
+      ...this.devLinks.filter((l) => l.url !== event.link.url),
+      { ...event.link },
+    ].slice(-MAX_DEV_LINKS);
+  }
+
   onIssueSprintChangedEvent(event: IssueSprintChangedEvent): void {
     this.sprintId = event.sprintId;
     this.updatedAt = event.occurredAt;

libs/api/tracker/domain/src/lib/read-models/issue.read-model.ts

@@ -1,3 +1,4 @@
+import { DevLink } from '../issue/dev-link';
 import { IssueLinkType, IssuePriority } from '../issue/issue.enums';
 import { StatusCategory } from '../project/project-settings';
 import { UserRefReadModel } from './user-ref.read-model';
@@ -84,6 +85,8 @@ export class IssueReadModel {
   /** Place in the backlog (and in each board column): ascending. */
   rank!: string;
   checklist!: ChecklistItemReadModel[];
+  /** Commits, branches and pull requests that mention it. */
+  devLinks!: DevLink[];
   commentCount!: number;
   createdAt!: string;
   updatedAt!: string;