def kill_user_sessions(request: Request, user: IUser, operation: str):
"""Notify session to drop this user.
:param request: Pyramid request.
:param user: User.
:param operation: Operation triggering the killing of user sessions.
"""
user.last_auth_sensitive_operation_at = now()
e = events.UserAuthSensitiveOperation(request, user, operation)
request.registry.notify(e, request)
