Cosmetic fixes

app/Model/ProjectDailyStats.php

@@ -2,6 +2,8 @@
 
 namespace Kanboard\Model;
 
+use use PicoDb\Database;
+
 /**
  * Project Daily Stats
  *
@@ -29,7 +31,7 @@ class ProjectDailyStats extends Base
     {
         $lead_cycle_time = $this->projectAnalytic->getAverageLeadAndCycleTime($project_id);
 
-        return $this->db->transaction(function ($db) use ($project_id, $date, $lead_cycle_time) {
+        return $this->db->transaction(function (Database $db) use ($project_id, $date, $lead_cycle_time) {
 
             // This call will fail if the record already exists
             // (cross database driver hack for INSERT..ON DUPLICATE KEY UPDATE)