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"""
Custom Exception Classes
"""
class AppException(Exception):
"""Base application exception"""
def __init__(self, message: str, code: str = None):
self.message = message
self.code = code
super().__init__(self.message)
class NotFoundException(AppException):
"""Resource not found"""
pass
class BusinessRuleException(AppException):
"""Business rule violation"""
pass
class ValidationException(AppException):
"""Data validation error"""
pass
class AuthenticationException(AppException):
"""Authentication failure"""
pass
class AuthorizationException(AppException):
"""Authorization failure"""
pass
class ConcurrentUpdateError(AppException):
"""Optimistic locking conflict"""
pass
class ExternalServiceException(AppException):
"""External service integration error"""
pass
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