Summary: Updates PhamePost for modular transactions.
Test Plan:
- Create a post
- Edit a post
- Add a header image
- Delete header image
- Award Token
- Leave comment
- Unpublish post
- Check History page
- Move post
- Archive post
{F4936456}
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D17818
