Add helper methods to Db lib

libs/Db.py

@@ -27,3 +27,14 @@ class Db:
         for filename in os.listdir('./data/models'):
             if filename.endswith('.py'):
                 importlib.import_module('.' + filename[:-3], 'data.models')
+
+    def role_exists(self, model: Model, role: str):
+        does_exist = False
+        language = self.session.query(model).filter(model.label == role).first()
+        if language is not None:
+            does_exist = True
+        return does_exist
+
+    def add_record(self, model):
+        self.session.add(model)
+        self.session.commit()