# preprocessing/monitoring/audit_trail.py
from dataclasses import dataclass
from typing import List, Optional, Any

@dataclass
class AuditRecord:
    """Record of a single preprocessing action"""
    rule_id: str
    action: str
    column: str
    rows_affected: int
    before_sample: Optional[str] = None
    after_sample: Optional[str] = None
    metadata: Optional[dict] = None

class AuditTrail:
    def __init__(self):
        self.records: List[AuditRecord] = []

    def save(self, job_id: str):
        """Placeholder for saving audit trail"""
        pass
