feat: added patch promocode, promocode stat, user signup/signin, user profile get/patch, user feed

also bug fixes and improvements

solution/config/errors.py

@@ -4,6 +4,3 @@ from django.core.exceptions import ValidationError
 class UniqueConstraintError(Exception):
     def __init__(self, validation_error: ValidationError) -> None:
         self.validation_error = validation_error
-
-
-__all__ = ["UniqueConstraintError"]

solution/config/integrations/antifraud/healthcheck.py

@@ -18,6 +18,3 @@ class AntifraudHealthCheck(BaseHealthCheckBackend):
 
     def identifier(self) -> str:
         return self.__class__.__name__
-
-
-__all__ = ["AntifraudHealthCheck"]