Thank you. Yes, it acts like frontend proxy before forwarding any request into the backend (strfry internal relay). However, RELAYS_SOURCE determines where to fetch/aggregate Nostr events (kind 1) before classifying them into various category and send them into target relay (strfry internal relay). UPSTREAM_WS_URL is the correct one for settings which relay to be the target of proxy. I have run several tools in this docker image, maybe it makes a bit confusing 😅 

 Yes I get it 🙂 already saw the other services and it makes sense to me Will look into it further later on 👍🏻 

 Thank you, hopefully the code will be quite easy to read, please bear with me if it is not quite clean 😅 

 Well most of the comments I must translate 😅 

 Yes, nostr-filter comments come from upstream (imksoo/nostr-filter), haven't touch any of those yet. imksoo-san primarily makes this mainly for their Japanese relay at first. I can understand a bit based only on the code written 😂