Enha: db use same connection to avoid db locking

crons/main.go

@@ -28,6 +28,7 @@ func (cm *CronManager) Start() {
 			cm.CleanupRooms()
 			cm.CleanupActions()
 			cm.CleanupPlayersRoom()
+			ticker.Reset(30 * time.Second)
 		}
 	}()
 }