diff --git a/app/audit/__init__.py b/app/audit/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/audit/service.py b/app/audit/service.py
new file mode 100644
index 0000000..4c41a83
--- /dev/null
+++ b/app/audit/service.py
@@ -0,0 +1,29 @@
+from typing import Any
+
+from sqlalchemy.orm import Session
+
+from app.models import AuditEvent
+
+
+# принимает сессию SQLAlchemy и параметры события (actor_id, client_id, ip, user_agent, metadata);
+# создаёт запись AuditEvent и коммитит транзакцию
+def write_event(
+    db: Session,
+    event_type: str,
+    actor_id: int | None = None,
+    client_id: str | None = None,
+    ip: str | None = None,
+    user_agent: str | None = None,
+    metadata: dict[str, Any] | None = None,
+) -> AuditEvent:
+    event = AuditEvent(
+        event_type=event_type,
+        actor_id=actor_id,
+        client_id=client_id,
+        ip=ip,
+        user_agent=user_agent,
+        metadata_json=metadata,
+    )
+    db.add(event)
+    db.commit()
+    return event