"""
Castle Core Module - Pure accounting logic separated from database operations.

This module contains the core business logic for double-entry accounting,
following Beancount patterns for clean architecture:

- validation.py: Comprehensive validation rules

Benefits:
- Testable without database
- Reusable across different storage backends
- Clear separation of concerns
- Easier to audit and verify

Note: Balance calculation and inventory tracking have been migrated to Fava/Beancount.
All accounting calculations are now performed via Fava's query API.
"""

from .validation import ValidationError, validate_journal_entry, validate_balance

__all__ = [
    "ValidationError",
    "validate_journal_entry",
    "validate_balance",
]