feat: delete diffs on post purge, closes #10291

src/posts/delete.js

@@ -60,6 +60,7 @@ module.exports = function (Posts) {
 			deletePostFromUsersVotes(pid),
 			deletePostFromReplies(postData),
 			deletePostFromGroups(postData),
+			deletePostDiffs(pid),
 			db.sortedSetsRemove(['posts:pid', 'posts:votes', 'posts:flagged'], pid),
 			Posts.uploads.dissociateAll(pid),
 		]);
@@ -144,4 +145,12 @@ module.exports = function (Posts) {
 		const keys = groupNames[0].map(groupName => `group:${groupName}:member:pids`);
 		await db.sortedSetsRemove(keys, postData.pid);
 	}
+
+	async function deletePostDiffs(pid) {
+		const timestamps = await Posts.diffs.list(pid);
+		await db.deleteAll([
+			`post:${pid}:diffs`,
+			...timestamps.map(t => `diff:${pid}.${t}`),
+		]);
+	}
 };