diff --git a/packages/api-contracts/src/messages.ts b/packages/api-contracts/src/messages.ts
index dfd2498..41a852f 100644
--- a/packages/api-contracts/src/messages.ts
+++ b/packages/api-contracts/src/messages.ts
@@ -23,6 +23,7 @@ export const SentMessageSchema = z.strictObject({
   postUrl: z.string().optional(),
   postImageUrl: z.string().optional(),
   postImageAnalysis: z.string().optional(),
+  postCreatedAt: z.number().optional(),
   owner: RedditAccountOwnerSchema.optional(),
 });
 export const MessagesResponseSchema = z.array(SentMessageSchema);
diff --git a/packages/api-contracts/tests/contracts.test.ts b/packages/api-contracts/tests/contracts.test.ts
index 55e3e64..d153161 100644
--- a/packages/api-contracts/tests/contracts.test.ts
+++ b/packages/api-contracts/tests/contracts.test.ts
@@ -96,6 +96,7 @@ describe('dashboard endpoint contracts', () => {
       modelId: 'openai/gpt-5.2',
       selectionReason: 'exploit',
       sourceType: 'image',
+      postCreatedAt: 1_699_999_900_000,
     }]).success).toBe(true);
     expect(SuccessfulExamplesResponseSchema.safeParse([{
       id: 1,