Delete the cache entry when the post is changed or deleted

src/Model/Item.php

@@ -196,6 +196,8 @@ class Item
 		$notify_items = [];
 
 		while ($item = DBA::fetch($items)) {
+			ActivityPub\PageCache::deleteByUriId($item['uri-id']);
+
 			if (!empty($fields['body'])) {
 				Post\Media::insertFromAttachmentData($item['uri-id'], $fields['body']);
 
@@ -319,6 +321,8 @@ class Item
 		// clean up categories and tags so they don't end up as orphans
 		Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 
+		ActivityPub\PageCache::deleteByUriId($item['uri-id']);
+
 		/*
 		 * If item is a link to a photo resource, nuke all the associated photos
 		 * (visitors will not have photo resources)