Fix cross-account candidate delivery

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';