Introduction of Partner Model, adding code to Tenant model

common/utils/form_assistants.py

@@ -0,0 +1,11 @@
+import json
+
+from wtforms.validators import ValidationError
+
+
+def validate_json(form, field):
+    if field.data:
+        try:
+            json.loads(field.data)
+        except json.JSONDecodeError:
+            raise ValidationError('Invalid JSON format')