diff --git a/backend/src/lib/ecosystem-phase1.test.ts b/backend/src/lib/ecosystem-phase1.test.ts
index b8d0990..e5da1b5 100644
--- a/backend/src/lib/ecosystem-phase1.test.ts
+++ b/backend/src/lib/ecosystem-phase1.test.ts
@@ -5,6 +5,7 @@ import { join } from 'node:path';
 import {
   buildPhase1NoteImport,
   loadLatestTranscriptArtifact,
+  loadLatestTranscriptCaptureEvent,
   persistPhase1NoteOutputs,
 } from './ecosystem-phase1.js';
 
@@ -55,10 +56,45 @@ describe('ecosystem phase1 note import', () => {
       `${JSON.stringify(transcriptArtifact, null, 2)}\n`,
       'utf-8'
     );
+    await writeFile(
+      join(root, 'indexes', 'latest-transcript-event.json'),
+      `${JSON.stringify(
+        {
+          eventId: 'evt_capture_123',
+          eventName: 'capture.transcript.created',
+          eventVersion: 1,
+          occurredAt: '2026-04-03T18:15:00.000Z',
+          productId: 'lysnrai',
+          sourceSurface: 'desktop',
+          userId: 'user_saravana',
+          orgId: null,
+          sessionId: 'sess_123',
+          runId: null,
+          artifactId: 'art_transcript_123',
+          actor: { actorType: 'user', actorId: 'user_saravana' },
+          trace: {
+            correlationId: 'corr_123',
+            causationId: null,
+            parentEventId: null,
+          },
+          payload: {
+            artifactId: 'art_transcript_123',
+            durationMs: 1000,
+            language: 'en',
+            transcriptSource: 'microphone',
+          },
+        },
+        null,
+        2
+      )}\n`,
+      'utf-8'
+    );
 
     const loaded = await loadLatestTranscriptArtifact(root);
+    const transcriptCaptureEvent = await loadLatestTranscriptCaptureEvent(root);
     const generated = buildPhase1NoteImport({
       transcriptArtifact: loaded,
+      transcriptCaptureEvent,
       workspaceId: 'ws_phase1',
       userId: 'user_saravana',
       now: '2026-04-03T18:17:00.000Z',
@@ -88,6 +124,18 @@ describe('ecosystem phase1 note import', () => {
     expect(savedNoteArtifact.payload.noteFormat).toBe('markdown');
     expect(savedLinkedEvent.payload.targetArtifactId).toBe('art_transcript_123');
     expect(savedLinkedEvent.payload.relation).toBe('summarizes');
+    expect(generated.createdEvent.trace.causationId).toBe('evt_capture_123');
+    expect(generated.createdEvent.trace.parentEventId).toBe('evt_capture_123');
+    expect(savedLinkedEvent.trace.causationId).toBe(generated.createdEvent.eventId);
+
+    const savedCreatedEventIndex = JSON.parse(
+      await readFile(join(root, 'indexes', 'latest-note-created-event.json'), 'utf-8')
+    );
+    const savedLinkedEventIndex = JSON.parse(
+      await readFile(join(root, 'indexes', 'latest-note-linked-event.json'), 'utf-8')
+    );
+    expect(savedCreatedEventIndex.eventId).toBe(generated.createdEvent.eventId);
+    expect(savedLinkedEventIndex.eventId).toBe(generated.linkedEvent.eventId);
 
     await rm(root, { recursive: true, force: true });
   });
diff --git a/backend/src/lib/ecosystem-phase1.ts b/backend/src/lib/ecosystem-phase1.ts
index 6f26b9a..46d04fd 100644
--- a/backend/src/lib/ecosystem-phase1.ts
+++ b/backend/src/lib/ecosystem-phase1.ts
@@ -64,6 +64,11 @@ type EcosystemEvent = {
   payload: Record<string, unknown>;
 };
 
+type TranscriptCaptureEvent = EcosystemEvent & {
+  eventName: 'capture.transcript.created';
+  artifactId: string;
+};
+
 type NoteArtifactEnvelope = {
   id: string;
   artifactType: 'note';
@@ -108,8 +113,23 @@ export async function loadLatestTranscriptArtifact(root = getPhase1Root()): Prom
   return JSON.parse(raw) as TranscriptArtifact;
 }
 
+export async function loadLatestTranscriptCaptureEvent(
+  root = getPhase1Root()
+): Promise<TranscriptCaptureEvent | null> {
+  try {
+    const raw = await readFile(join(root, 'indexes', 'latest-transcript-event.json'), 'utf-8');
+    return JSON.parse(raw) as TranscriptCaptureEvent;
+  } catch (error) {
+    if ((error as NodeJS.ErrnoException).code === 'ENOENT') {
+      return null;
+    }
+    throw error;
+  }
+}
+
 export function buildPhase1NoteImport(params: {
   transcriptArtifact: TranscriptArtifact;
+  transcriptCaptureEvent?: TranscriptCaptureEvent | null;
   workspaceId: string;
   userId: string;
   now?: string;
@@ -233,8 +253,8 @@ export function buildPhase1NoteImport(params: {
     },
     trace: {
       correlationId,
-      causationId: null,
-      parentEventId: null,
+      causationId: params.transcriptCaptureEvent?.eventId ?? null,
+      parentEventId: params.transcriptCaptureEvent?.eventId ?? null,
     },
     payload: {
       artifactType: 'note',
@@ -285,6 +305,8 @@ export async function persistPhase1NoteOutputs(params: {
   await writeJson(join(root, 'events', 'artifact.created', `${params.createdEvent.eventId}.json`), params.createdEvent);
   await writeJson(join(root, 'events', 'artifact.linked', `${params.linkedEvent.eventId}.json`), params.linkedEvent);
   await writeJson(join(root, 'indexes', 'latest-note.json'), params.ecosystemNoteArtifact);
+  await writeJson(join(root, 'indexes', 'latest-note-created-event.json'), params.createdEvent);
+  await writeJson(join(root, 'indexes', 'latest-note-linked-event.json'), params.linkedEvent);
 }
 
 async function writeJson(path: string, payload: unknown): Promise<void> {
diff --git a/backend/src/modules/ecosystem-phase1/routes.ts b/backend/src/modules/ecosystem-phase1/routes.ts
index 05f030c..55daf93 100644
--- a/backend/src/modules/ecosystem-phase1/routes.ts
+++ b/backend/src/modules/ecosystem-phase1/routes.ts
@@ -7,6 +7,7 @@ import { createNoteArtifact } from '../note-artifacts/repository.js';
 import {
   buildPhase1NoteImport,
   loadLatestTranscriptArtifact,
+  loadLatestTranscriptCaptureEvent,
   persistPhase1NoteOutputs,
 } from '../../lib/ecosystem-phase1.js';
 
@@ -23,8 +24,10 @@ export async function ecosystemPhase1Routes(app: FastifyInstance) {
     }
 
     const transcriptArtifact = await loadLatestTranscriptArtifact();
+    const transcriptCaptureEvent = await loadLatestTranscriptCaptureEvent();
     const generated = buildPhase1NoteImport({
       transcriptArtifact,
+      transcriptCaptureEvent,
       workspaceId: parsed.data.workspaceId,
       userId: auth.sub,
     });