Does tor and entry or relay node with nyx utility keep in save any logs that allow to get information that can deanonymize the user (for example, any entries (notes, logs) about the ip-addresses of connections to the node, data packets, or any keys, etc.)? If so, where are these logs and similar information keep on linux? And is it possible to completely, without the possibility of recovery, delete this data? Interested in ensuring safety users who will transmit traffic through my entry or relay node.
As I understand it, unless you are operating your relay with debug logging turned on (not the default, and not a recommended setting), no uniquely-identifiable information is logged by Tor (or Nyx). Other software, such as IDSes or firewalls, could potentially be capturing information, but that is not something within the remit of Tor itself.