Add original Post ID to analytics response

When creating a post via POST /v1/posts, we receive a Post ID. However, the analytics endpoint returns different IDs for each platform-specific entry, with no way to link them back to the original post.

It would be helpful to include a parentPostId field in the analytics response that references the original Post ID. This would make it easier to match analytics data with posts stored in our system.

Thanks!
Ivan Koop