moved some models added cron and websocket base class

backend/models/recorder_model.py

@@ -93,6 +93,10 @@ class Recorder(db.Model):
     def get_by_name(name):
         return Recorder.query.filter(Recorder.name == name).first()
 
+    @staticmethod
+    def get_by_identifier(identifier):
+        return Recorder.query.filter(Recorder.id == identifier).first()
+
     @staticmethod
     def get_all():
         return Recorder.query.all()