Init first files

backend/app/services/audit.py

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+from sqlalchemy.ext.asyncio import AsyncSession
+from app.models.models import AuditLog
+
+
+async def write_audit_log(db: AsyncSession, action: str, user_id: int | None, payload: dict | None = None) -> None:
+    db.add(AuditLog(action=action, user_id=user_id, payload=payload or {}))
+    await db.commit()