diff --git a/src/services/reddit-account-runtime-builder.ts b/src/services/reddit-account-runtime-builder.ts
index 216422b..260c1bd 100644
--- a/src/services/reddit-account-runtime-builder.ts
+++ b/src/services/reddit-account-runtime-builder.ts
@@ -52,6 +52,25 @@ export interface ConcreteRuntimeFactoryOptions {
   isBotRunning?: () => boolean;
 }
 
+export function materializePreparedPostForAccount(
+  resources: Pick<RedditAccountRuntimeResources, 'postsRepo' | 'redditApi'>,
+  processed: ProcessedPost,
+  now: number = Date.now(),
+): void {
+  const { post } = processed;
+  resources.postsRepo.insertIfAbsent({
+    id: post.id,
+    subreddit: post.subreddit,
+    author: post.author,
+    title: post.title,
+    postUrl: resources.redditApi.getPostUrl(post),
+    imageUrl: processed.sourceType === 'image' ? resources.redditApi.getImageUrl(post) : null,
+    postCreatedAt: post.created_utc * 1_000,
+    processedAt: now,
+  });
+  resources.postsRepo.updateAnalysis(post.id, processed.imageAnalysis, processed.generatedMessage);
+}
+
 export function createConcreteRedditAccountRuntimeFactory(
   options: ConcreteRuntimeFactoryOptions,
 ): RedditAccountRuntimeFactory {
@@ -326,6 +345,13 @@ class AccountRuntimeLoop {
     if (signal?.aborted) {
       return { status: 'retryable', reason: 'Delivery interrupted by shutdown', retryAt: Date.now() + 5_000 };
     }
+
+    // Preparation may have been performed by a different authenticated
+    // scanner. Sent messages are account-scoped and reference that account's
+    // processed-post row, so materialise the prepared candidate locally before
+    // performing the irreversible remote chat creation.
+    materializePreparedPostForAccount(this.resources, processed);
+
     return rateLimiter.throttle(async (): Promise<PreparedDeliveryResult> => {
       if (this.config.browser.dryRun) {
         const reason = 'Dry run: message prepared but not sent';
diff --git a/tests/reddit-account-runtime-builder.test.ts b/tests/reddit-account-runtime-builder.test.ts
new file mode 100644
index 0000000..3731d62
--- /dev/null
+++ b/tests/reddit-account-runtime-builder.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it, vi } from 'vitest';
+import type { RedditPost } from '../src/reddit/api.js';
+import type { RedditAccountRuntimeResources } from '../src/services/reddit-account-runtime.js';
+import { materializePreparedPostForAccount } from '../src/services/reddit-account-runtime-builder.js';
+import type { ProcessedPost } from '../src/services/processor.js';
+
+describe('materializePreparedPostForAccount', () => {
+  it('creates the sending account post row before message persistence', () => {
+    const post: RedditPost = {
+      id: 'post-1', subreddit: 'test', author: 'alice', author_fullname: 't2_alice',
+      title: 'title', url: 'https://example.com/image.jpg', permalink: '/r/test/post-1',
+      thumbnail: '', is_self: false, created_utc: 123, over_18: true, spoiler: false,
+    };
+    const processed: ProcessedPost = {
+      post, imageAnalysis: 'analysis', detectedGender: 'female', generatedMessage: 'message',
+      strategyId: null, experimentId: null, promptVersion: null, selectionReason: null,
+      modelId: 'model', sourceType: 'image', toneId: 'default', scripted: false,
+    };
+    const insertIfAbsent = vi.fn();
+    const updateAnalysis = vi.fn();
+    const resources = {
+      postsRepo: { insertIfAbsent, updateAnalysis },
+      redditApi: {
+        getPostUrl: () => 'https://reddit.example/post-1',
+        getImageUrl: () => 'https://reddit.example/image.jpg',
+      },
+    } as unknown as Pick<RedditAccountRuntimeResources, 'postsRepo' | 'redditApi'>;
+
+    materializePreparedPostForAccount(resources, processed, 456);
+
+    expect(insertIfAbsent).toHaveBeenCalledWith({
+      id: 'post-1', subreddit: 'test', author: 'alice', title: 'title',
+      postUrl: 'https://reddit.example/post-1', imageUrl: 'https://reddit.example/image.jpg',
+      postCreatedAt: 123_000, processedAt: 456,
+    });
+    expect(updateAnalysis).toHaveBeenCalledWith('post-1', 'analysis', 'message');
+  });
+});