New archi: domain driven development

Working but need to check out code

domain/shared/exceptions.py

@@ -0,0 +1,21 @@
+"""Shared domain exceptions."""
+
+
+class DomainException(Exception):
+    """Base exception for all domain-related errors."""
+    pass
+
+
+class ValidationError(DomainException):
+    """Raised when domain validation fails."""
+    pass
+
+
+class NotFoundError(DomainException):
+    """Raised when a domain entity is not found."""
+    pass
+
+
+class AlreadyExistsError(DomainException):
+    """Raised when trying to create an entity that already exists."""
+    pass