delete topic post sorted sets on topic purge

src/topics/delete.js

@@ -45,7 +45,11 @@ module.exports = function(Topics) {
 	Topics.purge = function(tid, callback) {
 		async.parallel([
 			function(next) {
-				db.deleteAll(['tid:' + tid + ':followers', 'tid:' + tid + ':read_by_uid'], next);
+				db.deleteAll([
+					'tid:' + tid + ':followers',
+					'tid:' + tid + ':posts',
+					'tid:' + tid + ':posts:votes'
+				], next);
 			},
 			function(next) {
 				db.sortedSetsRemove(['topics:tid', 'topics:recent', 'topics:posts', 'topics:views'], tid, next);

src/topics/posts.js

@@ -218,14 +218,7 @@ module.exports = function(Topics) {
 	};
 
 	Topics.removePostFromTopic = function(tid, pid, callback) {
-		async.parallel([
-			function (next) {
-				db.sortedSetRemove('tid:' + tid + ':posts', pid, next);
-			},
-			function (next) {
-				db.sortedSetRemove('tid:' + tid + ':posts:votes', pid, next);
-			}
-		], function(err, results) {
+		db.sortedSetsRemove(['tid:' + tid + ':posts', 'tid:' + tid + ':posts:votes'], pid, function(err) {
 			if (err) {
 				return callback(err);
 			}