[Server] Fix query performance

src/api/endpoints/drive/folders.js

@@ -49,14 +49,14 @@ module.exports = (params, user, app) =>
 
 	// Construct query
 	const sort = {
-		created_at: -1
+		_id: -1
 	};
 	const query = {
 		user_id: user._id,
 		parent_id: folder
 	};
 	if (since !== null) {
-		sort.created_at = 1;
+		sort._id = 1;
 		query._id = {
 			$gt: new mongo.ObjectID(since)
 		};

src/api/endpoints/messaging/messages.js

@@ -74,11 +74,11 @@ module.exports = (params, user) =>
 	};
 
 	const sort = {
-		created_at: -1
+		_id: -1
 	};
 
 	if (since !== null) {
-		sort.created_at = 1;
+		sort._id = 1;
 		query._id = {
 			$gt: new mongo.ObjectID(since)
 		};

src/api/endpoints/my/apps.js

@@ -48,7 +48,7 @@ module.exports = (params, user) =>
 			limit: limit,
 			skip: offset,
 			sort: {
-				created_at: -1
+				_id: -1
 			}
 		});
 

src/api/endpoints/posts.js

@@ -38,11 +38,11 @@ module.exports = (params) =>
 
 	// Construct query
 	const sort = {
-		created_at: -1
+		_id: -1
 	};
 	const query = {};
 	if (since !== null) {
-		sort.created_at = 1;
+		sort._id = 1;
 		query._id = {
 			$gt: new mongo.ObjectID(since)
 		};

src/api/endpoints/posts/reposts.js

@@ -55,13 +55,13 @@ module.exports = (params, user) =>
 
 	// Construct query
 	const sort = {
-		created_at: -1
+		_id: -1
 	};
 	const query = {
 		repost_id: post._id
 	};
 	if (since !== null) {
-		sort.created_at = 1;
+		sort._id = 1;
 		query._id = {
 			$gt: new mongo.ObjectID(since)
 		};

src/api/endpoints/users.js

@@ -39,11 +39,11 @@ module.exports = (params, me) =>
 
 	// Construct query
 	const sort = {
-		created_at: -1
+		_id: -1
 	};
 	const query = {};
 	if (since !== null) {
-		sort.created_at = 1;
+		sort._id = 1;
 		query._id = {
 			$gt: new mongo.ObjectID(since)
 		};