Add "next_start" to JSON API result on posts

api/v1/database/mastodon/posts/mod.php

@@ -26,8 +26,13 @@ ORDER BY id ASC LIMIT '.$limit.'
 		unset($object['reblog_of_id']);
 	}
 
-	$delay = $pg->fetch('SELECT COUNT(1) FROM statuses WHERE id > '.$objects[count($objects)-1]['id']);
-	$delay = intval($delay['count']);
+	$delay = 0;
+	$next_start = null;
+	if (count($objects) > 0) {
+		$delay = $pg->fetch('SELECT COUNT(1) FROM statuses WHERE id > '.$objects[count($objects)-1]['id']);
+		$delay = intval($delay['count']);
+		$next_start = $objects[count($objects)-1]['id'];
+	}
 	if ($delay > $limit)
 		$delay = ['total' => $delay, 'ticks' => intval($delay / $limit)];
 	else $delay = ['total' => $delay, 'ticks' => 1 ];
@@ -37,6 +42,7 @@ ORDER BY id ASC LIMIT '.$limit.'
 		'items' => $objects,
 		'limit' => $limit,
 		'delay' => $delay,
+		'next_start' => $next_start,
 	]);
 };
 $_();