constitution · epochs · watch · epoch 3

comparison

c_4772ee88dbe3 (tommy-mor) vs c_3f420a1f5aa1 (tommy-mor)

download prompt · raw event · cmp_2d7cb5e2111652

council reasoning

~anthropic/claude-sonnet-latest · winner B · 65:35 · permalink

B delivers a substantial, coherent feature (server-rendered theme cookie/select replacing JS localStorage switcher, applied consistently across every page handler) plus real room-aware URL fixes (item_path_for_api_in_room, forum_thread_web_url) with new tests, all preserving working functionality. A mostly rips out a working demo-counter feature (net code reduction, arguably a regression in test coverage) and adds a settlement/batching worker for votes that, while a reasonable design, is unproven and less broadly impactful than B's cross-cutting fix.

~x-ai/grok-latest · winner A · 2:1 · permalink

Commit A removes disposable demo-counter scaffolding and introduces a real settlement worker (batched vote append + ranking recompute, warm cache, read-path ranked_items_cached, write→read lock narrowing)—lasting core architecture for the vote/rank loop. Commit B mainly wires theme cookies through layout/auth and room-scoped API URL helpers; useful correctness and UX, but more surface plumbing than A’s concurrency and ranking design.

openai/gpt-chat-latest · winner A · 4:1 · permalink

Side A makes a substantive architectural improvement by introducing a settlement worker that batches vote persistence and ranking recomputation, adds cached ranking reads (`ranked_items_cached`) to avoid unnecessary recomputation and write locks on HTTP requests, and removes the temporary demo-counter feature and its related event/UI code. Side B is largely a UI and routing enhancement for persistent themes plus correct room-specific URL generation in RPC responses, which is useful but less foundational than the concurrency, caching, and cleanup changes in Side A.

sides

A — c_4772ee88dbe3 (tommy-mor)

message

[07715165] nice

diff preview

diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index c3c62a76f424010d77a6090c84dd0b82098f573e..da2536112faea313352624cf2ce0ddd0ab3377c1 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -6,7 +6,7 @@ use axum::{
 use std::collections::HashMap;
 
 use crate::{
-    html::{demo_counter_panel, js_string_literal, ranking_panel, JsBuilder},
+    html::{js_string_literal, ranking_panel, JsBuilder},
     parser::parse_reddit_url,
     parser_render::parser_panel_morph,
     state::AppState,
@@ -35,13 +35,6 @@ pub async fn post_ui_html(
     };
 
     match action {
-        HtmlUiAction::BumpDemoCounter => {
-            let count = state.bump_demo_counter().await;
-            let panel = demo_counter_panel(count, state.event_log.path().to_string_lossy().as_ref());
-            JsBuilder::new()
-                .morph_selector("#demo-counter-panel", panel)
-                .into_response()
-        }
         HtmlUiAction::RecordVote {
             a,
             b,
@@ -54,8 +47,8 @@ pub async fn post_ui_html(
             {
                 return ui_js_warn(&e).into_response();
             }
-            let mut group = state.group.write().await;
-            let panel = ranking_panel(&mut group);
+            let group = state.group.read().await;
+            let panel = ranking_panel(&group);
             JsBuilder::new()
                 .morph_selector("#ranking-panel", panel)
                 .into_response()
@@ -87,20 +80,6 @@ mod tests {
         assert!(matches!(err, HtmlUiParseError::MissingRpc));
     }
 
-    #[test]
-    fn bump_action_deserializes() {
-        let template = serde_json::json!({ "action": "bump_demo_counter" });
-        let mut form = HashMap::new();
-        form.insert(
-            UI_RPC_FIELD.to_string(),
-            serde_json::to_string(&template).unwrap(),
-        );
-        assert_eq!(
-            parse_html_ui_from_form(&form).unwrap(),
-            HtmlUiAction::BumpDemoCounter
-        );
-    }
-
     #[test]
     fn record_vote_action_deserializes() {
         let template = serde_json::json!({
diff --git a/server/src/events.rs b/server/src/events.rs
index b969242534e184d4f0a689543a479670b08a18df..eff80aef0257f706d2341f666e63d6a3d921bf6e 100644
--- a/server/src/events.rs
+++ b/server/src/events.rs
@@ -5,8 +5,6 @@ use serde::{Deserialize, Serialize};
 pub enum Event {
     /// Page view recorded (path → counter in views.json).
     ViewRecorded { path: String, ts: i64 },
-    /// Demo counter bump from `POST /ui` (persisted in the single JSONL log).
-    DemoCounterBumped { ts: i64, value: u64 },
     /// Pairwise comparison vote (replayed into [`crate::reducer::GroupState`] on boot).
     VoteRecorded {
         ts: i64,
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index 5b1d0b5a887d89e7e80796aa7a6c8ed5baaf2782..d69ed962b5c8625bc83c933b1825f2cc1d0868e2 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -13,7 +13,7 @@ use crate::{
     form_template::template_json_compact,
     parser_action::ParserAction,
     parser_render::parser_panel,
-    ranking::ranked_items,
+    ranking::ranked_items_cached,
     reducer::GroupState,
     state::AppState,
     ui_action::UI_RPC_FIELD,
@@ -199,10 +199,8 @@ fn layout(title: &str, body: Markup, views: u64, theme: &str, theme_next: &str)
     }
 }
 
-pub fn ranking_panel(group: &mut GroupState) -> Markup {
-    const MAX_ITERS: usize = 10_000;
-    const TOL: f64 = 1e-8;
-    let items = ranked_items(group, MAX_ITERS, TOL);
+pub fn ranking_panel(group: &GroupState) -> Markup {
+    let items = ranked_items_cached(group);
     html! {
         section id="ranking-panel" class="demo-panel" {
             h2 { "Ranking" }
@@ -260,35 +258,6 @@ pub fn vote_panel() -> Markup {
 }
 
 
-pub fn demo_counter_panel(count: u64, event_log_path: &str) -> Markup {
-    let rpc = template_json_compact(&serde_json::json!({ "action": "bump_demo_counter" }))
-        .expect("rpc json");
-    html! {
-        section id="demo-counter-panel" class="demo-panel" {
-            h1 { "sorter2" }
-            p class="muted" {
-                "Pairwise ranking scaffold — votes persist to JSONL and replay on boot."
-            }
-            p class="demo-count" {
-                strong { "Counter: " }
-                span id="demo-count-value" { (count) }
-            }
-            p class="muted small" {
-                "Event log: " code { (event_log_path) }
-            }
-            form method="post" action="/ui" id="demo-bump-form" {
-                input type="hidden" name=(UI_RPC_FIELD) value=(rpc);
-                button type="submit" class="btn-primary" { "Bump (POST /ui → eval JS)" }
-            }
-            p class="muted small" {
-                "Uses hidden "
-                code { "__rpc__" }
-                " JSON + Idiomorph morph — no full page reload."
-            }
-        }
-    }
-}
-
 pub async fn home(
     State(state): State<AppState>,
     jar: CookieJar,
@@ -297,16 +266,15 @@ pub async fn home(
     let path = uri.path().to_string();
     state.views.increment(path.clone());
     let views = state.views.get_views(&path);
-    let count = *state.demo_counter.read().await;
     let theme = theme_from_jar(&jar);
     let theme_next = theme_next_from_uri(&uri);
-    let mut group = state.group.write().await;
+    let group = state.group.read().await;
     let empty_action = ParserAction::suggest(String::new(), None);
     let body = html! {
+        h1 { "sorter2" }
         (parser_panel("", &empty_action))
         (vote_panel())
-        (ranking_panel(&mut group))
-        (demo_counter_panel(count, state.event_log.path().to_string_lossy().as_ref()))
+        (ranking_panel(&group))
     };
     layout("sorter2", body, views, theme, &theme_next)
 }
diff --git a/server/src/lib.rs b/server/src/lib.rs
index 6716c5b282e7980a7a0f03d63ad8b25eda61cc55..fa423640d598f4ba97a5885d228e78d7b97f7a22 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -9,6 +9,7 @@ pub mod parser_render;
 pub mod path_types;
 pub mod ranking;
 pub mod reducer;
+pub mod settlement;
 pub mod state;
 pub mod ui_action;
 pub mod views;
diff --git a/server/src/ranking.rs b/server/src/ranking.rs
index 89d3280126a8d8f841721ce8cb63ff735d68752a..2d706762792ba9239bb3f1c2e4974a2fde908013 100644
--- a/server/src/ranking.rs
+++ b/server/src/ranking.rs
@@ -91,6 +91,11 @@ pub fn compute_group_ranking(group: &mut GroupState, max_iters: usize, tol: f64)
 
 pub fn ranked_items(group: &mut GroupState, max_iters: usize, tol: f64) -> Vec<RankedItem> {
     compute_group_ranking(group, max_iters, tol);
+    ranked_items_cached(group)
+}
+
+/// Read cached scores without recomputing (HTTP fast path).
+pub fn ranked_items_cached(group: &GroupState) -> Vec<RankedItem> {
     let mut items: Vec<RankedItem> = group
         .idx_to_item
         .iter()
@@ -105,7 +110,12 @@ pub fn ranked_items(group: &mut GroupState, max_iters: usize, tol: f64) -> Vec<R
     items
 }
 
-fn compute_scores_from_edges(n: usize, edges: impl Iterator<Item = ((usize, usize), f64)>, max_iters: usize, tol: f64) -> Vec<f64> {
+pub fn compute_scores_from_edges(
+    n: usize,
+    edges: impl Iterator<Item = ((usize, usize), f64)>,
+    max_iters: usize,
+    tol: f64,
+) -> Vec<f64> {
     if n == 0 {
         return vec![];
     }
diff --git a/server/src/settlement.rs b/server/src/settlement.rs
new file mode 100644
index 0000000000000000000000000000000000000000..1f722ceaea62cda22c28ab71551f259fbf049b81
--- /dev/null
+++ b/server/src/settlement.rs
@@ -0,0 +1,114 @@
+use std::sync::Arc;
+
+use tokio::sync::{mpsc, oneshot, RwLock};
+
+use crate::{
+    event_log::EventLog,
+    events::Event,
+    ranking::compute_scores_from_edges,
+    reducer::{GroupState, VoteData},
+};
+
+const MAX_ITERS: usize = 10_000;
+const TOL: f64 = 1e-8;
+
+pub struct SettlementCommand {
+    pub vote: VoteData,
+    pub event: Event,
+    pub reply: oneshot::Sender<Result<(), String>>,
+}
+
+#[derive(Clone)]
+pub struct SettlementClient {
+    tx: mpsc::Sender<SettlementCommand>,
+}
+
+impl SettlementClient {
+    pub fn spawn(group: Arc<RwLock<GroupState>>, event_log: Arc<EventLog>) -> Self {
+        let (tx, rx) = mpsc::channel(64);
+        tokio::spawn(settlement_worker(rx, group, event_log));
+        Self { tx }
+    }
+
+    pub async fn record_vote(&self, vote: VoteData, event: Event) -> Result<(), String> {
+        let (reply, rx) = oneshot::channel();
+        self.tx
+            .send(SettlementCommand {
+                vote,
+                event,
+                reply,
+            })
+            .await
+            .map_err(|_| "settlement worker stopped".to_string())?;
+        rx.await
+            .map_err(|_| "settlement worker stopped".to_string())?
+    }
+}
+
+async fn settlement_worker(
+    mut rx: mpsc::Receiver<SettlementCommand>,
+    group: Arc<RwLock<GroupState>>,
+    event_log: Arc<EventLog>,
+) {
+    while let Some(first) = rx.recv().await {
+        let mut batch = vec![first];
+        while let Ok(more) = rx.try_recv() {
+            batch.push(more);
+        }
+
+        let mut disk_err: Option<String> = None;
+        for cmd in &batch {
+            if let Err(e) = event_log.append(&cmd.event).await {
+                disk_err = Some(e.to_string());
+                break;
+            }
+        }
+
+        if let Some(err) = disk_err {
+            for cmd in batch {
+                let _ = cmd.reply.send(Err(err.clone()));
+            }
+            continue;
+        }
+
+        let (edges, n) = {
+            let mut w = group.write().await;
+            for cmd in &batch {
+                w.apply_vote(cmd.vote.clone());
+            }
+            (w.edges.clone(), w.idx_to_item.len())
+        };
+
+        let new_scores = compute_scores_from_edges(
+            n,
+            edges.iter().map(|(&k, &v)| (k, v)),
+            MAX_ITERS,
+            TOL,
+        );
+
+        {
+            let mut w = group.write().await;
+            w.cached_scores = new_scores;
+            w.dirty = false;
+        }
+
+        for cmd in batch {
+            let _ = cmd.reply.send(Ok(()));
+        }
+    }
+}
+
+/// Compute ranking cache from current in-memory edges (startup replay only).
+pub fn warm_ranking_cache(group: &mut GroupState) {
+    if !group.dirty {
+        return;
+    }
+    let n = group.idx_to_item.len();
+    group.cached_scores = compute_scores_from_edges(
+        n,
+        group.edges.iter().map(|(&k, &v)| (k, v)),
+        MAX_ITERS,
+        TOL,
+    );
+    group.dirty = false;
+}
diff --git a/server/src/state.rs b/server/src/state.rs
index 8ec9902e2ecc31cf8208f7ad6365891dc5537eed..1922541a4064c2de1df2d993a461cae783320e05 100644
--- a/server/src/state.rs
+++ b/server/src/state.rs
@@ -6,6 +6,7 @@ use crate::{
     event_log::EventLog,
     events::Event,
     reducer::{GroupState, VoteData},
+    settlement::{warm_ranking_cache, SettlementClient},
     views::ViewStore,
 };
 
@@ -38,8 +39,8 @@ pub struct AppState {
     pub cfg: Arc<AppConfig>,
     pub event_log: Arc<EventLog>,
     pub views: ViewStore,
-    pub demo_counter: Arc<RwLock<u64>>,
     pub group: Arc<RwLock<GroupState>>,
+    settlement: SettlementClient,
 }
 
 impl AppState {
@@ -48,14 +49,10 @@ impl AppState {
         let views_path = format!("{}/views.json", cfg.data_dir);
         let views = ViewStore::new(&views_path);
 
-        let mut demo_counter: u64 = 0;
         let mut group = GroupState::new();
         if let Ok((events, _)) = event_log.load_all().await {
             for ev in events {
                 match ev {
-                    Event::DemoCounterBumped { value, .. } => {
-                        demo_counter = demo_counter.max(value);
-                    }
                     Event::VoteRecorded {
                         ts,
                         a,
@@ -74,30 +71,20 @@ impl AppState {
             }
         }
 
+       

… preview truncated; 6,096 characters omitted

download full diff A

B — c_3f420a1f5aa1 (tommy-mor)

message

[2fe70b0e] themes

diff preview

diff --git a/server/src/api/auth.rs b/server/src/api/auth.rs
index 559db65de14c6157690ffbf18eca0cf65b0a5202..b3631b06153d52f88348fef927e7a024b7b85ad6 100644
--- a/server/src/api/auth.rs
+++ b/server/src/api/auth.rs
@@ -1,7 +1,7 @@
 use axum::{
     body::Body,
     extract::{Path, Query, State},
-    http::{header, HeaderMap, HeaderValue, StatusCode},
+    http::{header, HeaderMap, HeaderValue, StatusCode, Uri},
     response::{IntoResponse, Redirect, Response},
     Form, Json,
 };
@@ -17,7 +17,7 @@ use crate::{
     events::{Event, GrantAdded, TokenIssued, UserRegistered},
     html::{
         auth_complete_page, auth_signed_in_fragment, choose_username_error_fragment,
-        choose_username_page, JsBuilder,
+        choose_username_page, theme_cookie_header_from_jar, theme_from_jar, theme_next_from_uri, JsBuilder,
     },
     identity::{parse_agent, parse_username},
     reducer::ReducerState,
@@ -48,15 +48,17 @@ fn js_form_error_fragment(session: &str, error: &str) -> Response {
         .into_response()
 }
 
-fn js_signed_in_fragment(bearer: &str) -> Response {
+fn js_signed_in_fragment(bearer: &str, jar: &CookieJar) -> Response {
     let mut response = JsBuilder::new()
         .id("choose-username-form")
         .morph_inner(auth_signed_in_fragment())
         .redirect("/auth/complete")
         .into_response();
-    response
-        .headers_mut()
-        .insert(header::SET_COOKIE, session_cookie_header_value(bearer));
+    let headers = response.headers_mut();
+    headers.append(header::SET_COOKIE, session_cookie_header_value(bearer));
+    if let Some(theme) = theme_cookie_header_from_jar(jar) {
+        headers.append(header::SET_COOKIE, theme);
+    }
     response
 }
 
@@ -69,13 +71,18 @@ pub fn optional_principal(headers: &HeaderMap, jar: &CookieJar, reduced: &Reduce
     verify_token(reduced, c.value()).ok()
 }
 
-fn redirect_with_session_cookie(public_url: &str, path_and_query: &str, bearer: &str) -> Response {
-    Response::builder()
+fn redirect_with_session_cookie(public_url: &str, path_and_query: &str, bearer: &str, jar: &CookieJar) -> Response {
+    let mut res = Response::builder()
         .status(StatusCode::TEMPORARY_REDIRECT)
         .header(header::LOCATION, format!("{public_url}{path_and_query}"))
-        .header(header::SET_COOKIE, session_cookie_header_value(bearer))
         .body(Body::empty())
-        .unwrap()
+        .unwrap();
+    let headers = res.headers_mut();
+    headers.append(header::SET_COOKIE, session_cookie_header_value(bearer));
+    if let Some(theme) = theme_cookie_header_from_jar(jar) {
+        headers.append(header::SET_COOKIE, theme);
+    }
+    res
 }
 
 async fn apply_invite_redemption(state: &AppState, invite_token: &str, grantee_username: &str) -> Result<(), String> {
@@ -286,7 +293,11 @@ pub struct AuthCallbackQuery {
     pub state: String,
 }
 
-pub async fn get_auth_callback(Query(q): Query<AuthCallbackQuery>, State(state): State<AppState>) -> impl IntoResponse {
+pub async fn get_auth_callback(
+    Query(q): Query<AuthCallbackQuery>,
+    State(state): State<AppState>,
+    jar: CookieJar,
+) -> impl IntoResponse {
     let sessions = pending_sessions(&state);
     {
         let sessions_read = sessions.read().await;
@@ -365,7 +376,7 @@ pub async fn get_auth_callback(Query(q): Query<AuthCallbackQuery>, State(state):
             }
             let cookie_bearer = bearer.clone();
             s.complete = Some((username, bearer));
-            return redirect_with_session_cookie(&public_url, "/", &cookie_bearer).into_response();
+            return redirect_with_session_cookie(&public_url, "/", &cookie_bearer, &jar).into_response();
         }
     }
 
@@ -378,14 +389,20 @@ pub struct ChooseUsernameQuery {
     pub error: Option<String>,
 }
 
-pub async fn get_choose_username(Query(q): Query<ChooseUsernameQuery>, State(state): State<AppState>) -> impl IntoResponse {
+pub async fn get_choose_username(
+    Query(q): Query<ChooseUsernameQuery>,
+    State(state): State<AppState>,
+    jar: CookieJar,
+    uri: Uri,
+) -> impl IntoResponse {
     let sessions = pending_sessions(&state);
     let sessions_read = sessions.read().await;
     if !sessions_read.contains_key(&q.session) {
         return api_error(StatusCode::NOT_FOUND, "unknown session", None).into_response();
     }
     drop(sessions_read);
-    choose_username_page(&q.session, q.error.as_deref()).into_response()
+    let next = theme_next_from_uri(&uri);
+    choose_username_page(&q.session, q.error.as_deref(), theme_from_jar(&jar), &next).into_response()
 }
 
 #[derive(Debug, Deserialize)]
@@ -396,6 +413,7 @@ pub struct ChooseUsernameForm {
 
 pub async fn post_choose_username(
     State(state): State<AppState>,
+    jar: CookieJar,
     Form(form): Form<ChooseUsernameForm>,
 ) -> impl IntoResponse {
     let canon_user = match parse_username(&form.username) {
@@ -477,7 +495,7 @@ pub async fn post_choose_username(
         s.complete = Some((canon_user.clone(), bearer.clone()));
     }
 
-    js_signed_in_fragment(&bearer).into_response()
+    js_signed_in_fragment(&bearer, &jar).into_response()
 }
 
 /// Start a browser-only OAuth flow (no CLI polling). Sets session cookie on success.
@@ -569,8 +587,9 @@ pub async fn get_pending_session(
     .into_response()
 }
 
-pub async fn get_auth_complete() -> impl IntoResponse {
-    auth_complete_page()
+pub async fn get_auth_complete(jar: CookieJar, uri: Uri) -> impl IntoResponse {
+    let next = theme_next_from_uri(&uri);
+    auth_complete_page(theme_from_jar(&jar), &next).into_response()
 }
 
 pub async fn get_whoami(State(state): State<AppState>, headers: HeaderMap) -> impl IntoResponse {
diff --git a/server/src/api/helpers.rs b/server/src/api/helpers.rs
index 81e2a55fa3abb8609b4099f91a989480336e11eb..9b71491e9f9efc44a2a4beba09be8f64bd2ff2ee 100644
--- a/server/src/api/helpers.rs
+++ b/server/src/api/helpers.rs
@@ -39,6 +39,55 @@ pub fn item_path_for_api(item: &str) -> String {
     }
 }
 
+/// Same as [`item_path_for_api`], but for private rooms ontology items are prefixed with
+/// `/r/{short}/{slug}` so the URL matches the web app (`/r/…/~/…` routes).
+pub fn item_path_for_api_in_room(item: &str, room_wire: &str) -> String {
+    let room = room_wire.trim();
+    if room.is_empty() || room == "public" {
+        return item_path_for_api(item);
+    }
+    let Some((short, slug)) = room.split_once('/') else {
+        return item_path_for_api(item);
+    };
+    if short.is_empty() || slug.is_empty() {
+        return item_path_for_api(item);
+    }
+    let Some(c) = CanonicalItemUrl::parse(item) else {
+        return item_path_for_api(item);
+    };
+    let root = CanonicalItemUrl::ontology_root();
+    let item_norm = c.as_str().trim_end_matches('/');
+    let root_norm = root.as_str().trim_end_matches('/');
+    if let Some(tail) = c.tilde_tail() {
+        return if tail.is_empty() {
+            format!("https://slug.social/r/{short}/{slug}/~")
+        } else {
+            format!("https://slug.social/r/{short}/{slug}/~/{}", tail)
+        };
+    }
+    if item_norm == root_norm {
+        return format!("https://slug.social/r/{short}/{slug}/~");
+    }
+    item_path_for_api(item)
+}
+
+/// Absolute thread URL for forum JSON (`/t/…` vs `/r/…/t/…`).
+pub fn forum_thread_web_url(room_wire: &str, thread_tag: &str) -> String {
+    let room = room_wire.trim();
+    let tag = thread_tag.trim().trim_start_matches('#');
+    if room.is_empty() || room == "public" {
+        format!("https://slug.social/t/{tag}")
+    } else if let Some((short, slug)) = room.split_once('/') {
+        if short.is_empty() || slug.is_empty() {
+            format!("https://slug.social/t/{tag}")
+        } else {
+            format!("https://slug.social/r/{short}/{slug}/t/{tag}")
+        }
+    } else {
+        format!("https://slug.social/t/{tag}")
+    }
+}
+
 /// Resolve an item path as a first-class canonical path.
 pub fn resolve_item(item: &str) -> Result<String, String> {
     let canonical = canonicalize_item(item);
@@ -188,3 +237,52 @@ pub fn vote_touches_path(a: &str, b: &str, parent_canon: &str) -> bool {
     let under = |item: &str| item == parent_canon || item.starts_with(&format!("{}/", parent_canon));
     under(a) || under(b)
 }
+
+#[cfg(test)]
+mod wire_url_tests {
+    use super::{forum_thread_web_url, item_path_for_api_in_room};
+
+    #[test]
+    fn public_room_unchanged() {
+        let u = "https://slug.social/~/a/b";
+        assert_eq!(item_path_for_api_in_room(u, "public"), u);
+    }
+
+    #[test]
+    fn private_room_prefixes_ontology() {
+        assert_eq!(
+            item_path_for_api_in_room("https://slug.social/~/topic/x", "9ab12cd/my-room"),
+            "https://slug.social/r/9ab12cd/my-room/~/topic/x"
+        );
+    }
+
+    #[test]
+    fn private_room_ontology_root() {
+        assert_eq!(
+            item_path_for_api_in_room("https://slug.social/~", "9ab12cd/my-room"),
+            "https://slug.social/r/9ab12cd/my-room/~"
+        );
+        assert_eq!(
+            item_path_for_api_in_room("https://slug.social/~/", "9ab12cd/my-room"),
+            "https://slug.social/r/9ab12cd/my-room/~"
+        );
+    }
+
+    #[test]
+    fn external_url_untouched_in_private_room() {
+        let u = "https://example.com/z";
+        assert_eq!(item_path_for_api_in_room(u, "9ab12cd/my-room"), u);
+    }
+
+    #[test]
+    fn forum_web_public_vs_room() {
+        assert_eq!(
+            forum_thread_web_url("public", "debate"),
+            "https://slug.social/t/debate"
+        );
+        assert_eq!(
+            forum_thread_web_url("9ab12cd/my-room", "#debate"),
+            "https://slug.social/r/9ab12cd/my-room/t/debate"
+        );
+    }
+}
diff --git a/server/src/api/rpc.rs b/server/src/api/rpc.rs
index 31f5fcfb4eaf4df0a9cbac532dd3dedfe3611810..5b91f5836625eedbb1cd9423168046e3fb576c17 100644
--- a/server/src/api/rpc.rs
+++ b/server/src/api/rpc.rs
@@ -27,8 +27,9 @@ use crate::{
 
 use super::auth::verify_bearer_principal;
 use super::helpers::{
-    compute_connectivity_stats, is_pair_voted, item_path_for_api, now_ms, paginate_rankings,
-    parse_parent_specs, pick_random_distinct, resolve_item, vote_touches_path,
+    compute_connectivity_stats, forum_thread_web_url, is_pair_voted, item_path_for_api,
+    item_path_for_api_in_room, now_ms, paginate_rankings, parse_parent_specs, pick_random_distinct,
+    resolve_item, vote_touches_path,
 };
 use super::validate::{normalize_room_and_thread, validate_ingest_document};
 
@@ -148,6 +149,7 @@ fn compute_scope_rank_changes(
     parent: &str,
     before: &crate::scope_rank::ChildrenRankings,
     after: &crate::scope_rank::ChildrenRankings,
+    room_wire: &str,
 ) -> Option<ScopeRankChanges> {
     fn build_positions(rankings: &crate::scope_rank::ChildrenRankings) -> HashMap<String, Option<RankPosition>> {
         let mut map = HashMap::new();
@@ -182,7 +184,7 @@ fn compute_scope_rank_changes(
         };
         if changed {
             changes.push(RankChange {
-                item: item_path_for_api(&item),
+                item: item_path_for_api_in_room(&item, room_wire),
                 before: b,
                 after: a,
             });
@@ -204,7 +206,7 @@ fn compute_scope_rank_changes(
         parent: if parent.is_empty() {
             "/".to_string()
         } else {
-            item_path_for_api(parent)
+            item_path_for_api_in_room(parent, room_wire)
         },
         changes,
     })
@@ -256,6 +258,7 @@ fn build_rank_response_for_content(
     offset: usize,
     limit: Option<usize>,
     want_percent: bool,
+    room_wire: &str,
 ) -> Result<RankResponse, RpcErr> {
     let parent_owned = parent.map(|s| s.to_string());
     let specs = parse_parent_specs(parent_owned.as_ref());
@@ -299,7 +302,7 @@ fn build_rank_response_for_content(
                     .ranked
                     .into_iter()
                     .map(|r| RankRow {
-                  

… preview truncated; 42,928 characters omitted

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