How to delete an "orphaned" ActivityPub post

[jsit]

I had a post on my ActivityPub profile that was linked to a post that had been deleted on WordPress; I must have deleted the WP post before the AP plugin added delete functionality, or after having deactivated the plugin.

The WP post was long gone, so I couldn't restore it in order to then re-delete it, triggering a delete of the AP post. Instead what I did was:

1. Deactivate the ActivityPub plugin
2. Create a new post
3. Use MySQL to give the new post the ID of the deleted post (this may not be necessary)
4. Make sure WP's permalink settings are set up so that the permalink of the new post matches the permalink of the ActivityPub post
5. Reactivate the AP plugin
6. Use wp-cli to delete the post: wp activitypub post delete [1234]

Some of these steps may not be necessary, but this worked for me.