constitution · epochs · watch · epoch 3

comparison

c_45dfa34511fe (tommy-mor) vs c_0c466eea1ed4 (tommy-mor)

download prompt · raw event · cmp_558c63942eac4e

council reasoning

~anthropic/claude-sonnet-latest · winner A · 6:4 · permalink

A performs a genuine, broad correctness refactor: it introduces validated room_route_segment/room_id_from_route_segment helpers (replacing brittle ad-hoc split_once calls across handlers, nav, search, and tests) and adds a real url_normalize module with tested YouTube-link canonicalization and query-sorting logic that improves external item identity handling. B adds a self-contained dev-only sorterc tool and offline module—useful for local iteration but isolated from core routing/product logic and lower-stakes than A's cross-cutting fixes to route parsing and canonical URL identity.

~x-ai/grok-latest · winner A · 3:1 · permalink

A delivers a lasting core design change: tightens private-room HTTP paths to a single `/r/{short}{slug}` segment with shared `room_route` encode/decode, wires it through routers/nav/path builders/tests, and adds durable external-URL identity normalization (YouTube rewrite, query sort). B only adds a workspace-only offline CLI plus `server` helper module for local .sorter compile/JSONL lint—useful developer friction reduction, but non-runtime and easy to recreate relative to A’s product-facing URL contract.

openai/gpt-chat-latest · winner A · 3:2 · permalink

Side A introduces a lasting URL routing redesign by centralizing private-room path encoding/decoding (`room_route_segment`/`room_id_from_route_segment`), replacing ad hoc `split_once('/')` logic across routing, link generation, navigation, tests, and constants such as `ROOM_SHORT_ID_LEN`. It also improves canonical URL handling with reusable normalization utilities (including YouTube normalization and stable external URL canonicalization), whereas Side B primarily adds an offline developer tool (`sorterc`) that reuses existing validation and ranking logic without changing the application's core behavior.

sides

A — c_45dfa34511fe (tommy-mor)

message

[5ca518f6] url refactor

diff preview

diff --git a/Cargo.lock b/Cargo.lock
index 67a09a3b54f778fa7e857fdd589c3ed9c92e1322..ad7e4fe6d4ba2f2b033916194c1ef1ed873f1d46 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1757,6 +1757,7 @@ name = "slug-types"
 version = "0.1.0"
 dependencies = [
  "serde",
+ "url",
 ]
 
 [[package]]
@@ -2272,6 +2273,7 @@ dependencies = [
  "idna",
  "percent-encoding",
  "serde",
+ "serde_derive",
 ]
 
 [[package]]
diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index 606f7d6f97a4428efb90d1e0d544934c861fc4c5..cd3e0f0afd972d9ad9e7e4b92c5fa4c22bb8f620 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -270,10 +270,10 @@ fn post_redirect_location(room: &str, thread_tag: &str) -> String {
         format!("/t/{tag}")
     } else {
         let room = room.trim();
-        let Some((a, b)) = room.split_once('/') else {
+        let Some(seg) = slug_types::room_route_segment(room) else {
             return "/".to_string();
         };
-        format!("/r/{a}/{b}/t/{tag}")
+        format!("/r/{seg}/t/{tag}")
     }
 }
 
diff --git a/server/src/api/write_actor.rs b/server/src/api/write_actor.rs
index cb78d2f3f95b1bc163c1fb064d1d5f657e18000f..f9c3b8bd3fbf8fcb9c035e1a1572fef0b08fa8a9 100644
--- a/server/src/api/write_actor.rs
+++ b/server/src/api/write_actor.rs
@@ -19,13 +19,15 @@ use crate::{
 use super::auth::{issue_token_for_user, verify_token};
 use super::helpers::{now_ms, resolve_item};
 use super::validate::{normalize_room_and_thread, validate_ingest_document};
-use slug_types::RpcResult;
+use slug_types::{room_route_segment, RpcResult, ROOM_SHORT_ID_LEN};
 
 fn gen_short_id() -> String {
     use rand::Rng;
     const ALPHABET: &[u8] = b"0123456789abcdefghijklmnopqrstuvwxyz";
     let mut rng = rand::thread_rng();
-    (0..7).map(|_| ALPHABET[rng.gen_range(0..ALPHABET.len())] as char).collect()
+    (0..ROOM_SHORT_ID_LEN)
+        .map(|_| ALPHABET[rng.gen_range(0..ALPHABET.len())] as char)
+        .collect()
 }
 
 fn parse_capability(s: &str) -> Result<crate::events::ThreadCapability, String> {
@@ -55,8 +57,8 @@ async fn broadcast_web_refresh(state: &AppState, room_key: &str, thread_id: &str
     let feed_id = if room_key == "public" { "thread-feed" } else { "room-thread-feed" };
     let thread_url = if room_key == "public" {
         format!("/t/{thread_id}")
-    } else if let Some((short, slug)) = room_key.split_once('/') {
-        format!("/r/{short}/{slug}/t/{thread_id}")
+    } else if let Some(seg) = room_route_segment(room_key) {
+        format!("/r/{seg}/t/{thread_id}")
     } else {
         format!("/t/{thread_id}")
     };
@@ -78,8 +80,8 @@ async fn broadcast_web_refresh(state: &AppState, room_key: &str, thread_id: &str
     let js = builder.build();
     let mut path_prefixes = vec![if room_key == "public" {
         "/".to_string()
-    } else if let Some((short, slug)) = room_key.split_once('/') {
-        format!("/r/{short}/{slug}")
+    } else if let Some(seg) = room_route_segment(room_key) {
+        format!("/r/{seg}")
     } else {
         "/".to_string()
     }];
diff --git a/server/src/html/forum/nav.rs b/server/src/html/forum/nav.rs
index 0ee33d91160fc5542817b5e3e9ab4fee1d0e600f..48fe11e46731670874ff8b6b05baa6f09ae0b7e4 100644
--- a/server/src/html/forum/nav.rs
+++ b/server/src/html/forum/nav.rs
@@ -1,7 +1,8 @@
 use crate::canonical_path::canonicalize_item;
 use crate::reducer::ScopeId;
+use slug_types::room_route_segment;
 
-/// URL helpers for public `/t/…` and private room threads `/r/{short}/{slug}/t/…`.
+/// URL helpers for public `/t/…` and private room threads `/r/{short}{slug}/t/…`.
 #[derive(Clone)]
 pub struct ThreadNav {
     pub room_wire: String,
@@ -22,18 +23,15 @@ impl ThreadNav {
         }
     }
 
-    /// `room_id` wire form `shortid/slug`.
+    /// `room_id` wire form `shortid/slug` (HTTP uses [`slug_types::room_route_segment`]).
     pub(crate) fn from_room_id(room_id: &str) -> Option<Self> {
-        let (short, slug) = room_id.split_once('/')?;
-        if short.is_empty() || slug.is_empty() {
-            return None;
-        }
+        let room_seg = room_route_segment(room_id)?;
         Some(Self {
             room_wire: room_id.to_string(),
             scope: ScopeId::Room(room_id.to_string()),
-            room_path: format!("/r/{short}/{slug}"),
-            thread_path_prefix: format!("/r/{short}/{slug}/t"),
-            garden_path_prefix: format!("/r/{short}/{slug}/~"),
+            room_path: format!("/r/{room_seg}"),
+            thread_path_prefix: format!("/r/{room_seg}/t"),
+            garden_path_prefix: format!("/r/{room_seg}/~"),
         })
     }
 
diff --git a/server/src/html/forum/post_single.rs b/server/src/html/forum/post_single.rs
index c316f8f836df9d4ef9c05ebd9e54f699540e6d72..473747b3da3d4d7a54b5e0c63165d2533df643e1 100644
--- a/server/src/html/forum/post_single.rs
+++ b/server/src/html/forum/post_single.rs
@@ -93,12 +93,14 @@ pub async fn thread_post_view(
 
 pub async fn room_thread_post_view(
     State(state): State<AppState>,
-    Path((room_short, room_slug, tag, index_str)): Path<(String, String, String, String)>,
+    Path((room_key, tag, index_str)): Path<(String, String, String)>,
     headers: HeaderMap,
     jar: CookieJar,
     uri: Uri,
 ) -> impl IntoResponse {
-    let room_id = format!("{room_short}/{room_slug}");
+    let Some(room_id) = slug_types::room_id_from_route_segment(&room_key) else {
+        return (StatusCode::NOT_FOUND, "bad room path").into_response();
+    };
     let reduced = state.reduced.read().await;
     let user = optional_principal(&headers, &jar, &reduced);
     if !user_can_view_room(&reduced, &room_id, user.as_deref()) {
diff --git a/server/src/html/forum/views.rs b/server/src/html/forum/views.rs
index be5df1745ef580891a167c23c3dd6c06f804f295..1ec421f84335cbfe7f9db775b73a8ed24b197174 100644
--- a/server/src/html/forum/views.rs
+++ b/server/src/html/forum/views.rs
@@ -183,16 +183,18 @@ pub async fn thread_view(
     thread_view_inner(state, tag, q, ThreadNav::public(), headers, jar, uri).await
 }
 
-/// Room thread — `/r/:short/:slug/t/:tag`
+/// Room thread — `/r/:room_key/t/:tag` (`room_key` = `{short}{slug}`).
 pub async fn room_thread_view(
     State(state): State<AppState>,
-    Path((room_short, room_slug, tag)): Path<(String, String, String)>,
+    Path((room_key, tag)): Path<(String, String)>,
     Query(q): Query<ThreadViewQuery>,
     headers: HeaderMap,
     jar: CookieJar,
     uri: Uri,
 ) -> impl IntoResponse {
-    let room_id = format!("{room_short}/{room_slug}");
+    let Some(room_id) = slug_types::room_id_from_route_segment(&room_key) else {
+        return (StatusCode::NOT_FOUND, "bad room path").into_response();
+    };
     let reduced = state.reduced.read().await;
     let user = optional_principal(&headers, &jar, &reduced);
     if !user_can_view_room(&reduced, &room_id, user.as_deref()) {
@@ -226,15 +228,17 @@ pub(super) fn room_not_found_page(jar: &CookieJar, uri: &Uri) -> impl IntoRespon
     (StatusCode::NOT_FOUND, Html(page.into_string()))
 }
 
-/// Private room index — `/r/:short/:slug`
+/// Private room index — `/r/:room_key`
 pub async fn room_page(
     State(state): State<AppState>,
-    Path((room_short, room_slug)): Path<(String, String)>,
+    Path(room_key): Path<String>,
     headers: HeaderMap,
     jar: CookieJar,
     uri: Uri,
 ) -> impl IntoResponse {
-    let room_id = format!("{room_short}/{room_slug}");
+    let Some(room_id) = slug_types::room_id_from_route_segment(&room_key) else {
+        return (StatusCode::NOT_FOUND, "room not found").into_response();
+    };
     let now = now_ms();
     let reduced = state.reduced.read().await;
     if !reduced.rooms.contains(&room_id) {
@@ -266,7 +270,10 @@ pub async fn room_page(
     let audit_cli = format!("npx slugsocial private {room_id} audit");
     drop(reduced);
 
-    let slug_display = room_slug.as_str();
+    let slug_display = room_id
+        .split_once('/')
+        .map(|(_, slug)| slug)
+        .unwrap_or(room_id.as_str());
     let page = layout(
         &format!("room {slug_display} — slug.social"),
         "view-thread",
diff --git a/server/src/html/garden.rs b/server/src/html/garden.rs
index 423f23fd8c9ad7b7f454d6ea7a9a7607a4c9c5b9..e615dd356bcf634232d85610c0a26235ead125fd 100644
--- a/server/src/html/garden.rs
+++ b/server/src/html/garden.rs
@@ -309,12 +309,14 @@ pub async fn external_ontology_path(
 
 pub async fn room_garden_index(
     State(state): State<AppState>,
-    Path((room_short, room_slug)): Path<(String, String)>,
+    Path(room_key): Path<String>,
     headers: HeaderMap,
     jar: CookieJar,
     uri: Uri,
 ) -> impl IntoResponse {
-    let room_id = format!("{room_short}/{room_slug}");
+    let Some(room_id) = slug_types::room_id_from_route_segment(&room_key) else {
+        return (StatusCode::NOT_FOUND, "bad room path").into_response();
+    };
     let Some(nav) = ThreadNav::from_room_id(&room_id) else {
         return (StatusCode::NOT_FOUND, "bad room path").into_response();
     };
@@ -341,12 +343,14 @@ pub async fn room_garden_index(
 
 pub async fn room_external_garden_index(
     State(state): State<AppState>,
-    Path((room_short, room_slug)): Path<(String, String)>,
+    Path(room_key): Path<String>,
     headers: HeaderMap,
     jar: CookieJar,
     uri: Uri,
 ) -> impl IntoResponse {
-    let room_id = format!("{room_short}/{room_slug}");
+    let Some(room_id) = slug_types::room_id_from_route_segment(&room_key) else {
+        return (StatusCode::NOT_FOUND, "bad room path").into_response();
+    };
     let Some(nav) = ThreadNav::from_room_id(&room_id) else {
         return (StatusCode::NOT_FOUND, "bad room path").into_response();
     };
@@ -416,12 +420,14 @@ pub async fn room_external_garden_index(
 
 pub async fn room_external_ontology_path(
     State(state): State<AppState>,
-    Path((room_short, room_slug, path)): Path<(String, String, String)>,
+    Path((room_key, path)): Path<(String, String)>,
     headers: HeaderMap,
     jar: CookieJar,
     uri: Uri,
 ) -> impl IntoResponse {
-    let room_id = format!("{room_short}/{room_slug}");
+    let Some(room_id) = slug_types::room_id_from_route_segment(&room_key) else {
+        return (StatusCode::NOT_FOUND, "bad room path").into_response();
+    };
     let Some(nav) = ThreadNav::from_room_id(&room_id) else {
         return (StatusCode::NOT_FOUND, "bad room path").into_response();
     };
@@ -442,12 +448,14 @@ pub async fn room_external_ontology_path(
 
 pub async fn room_ontology_path(
     State(state): State<AppState>,
-    Path((room_short, room_slug, path)): Path<(String, String, String)>,
+    Path((room_key, path)): Path<(String, String)>,
     headers: HeaderMap,
     jar: CookieJar,
     uri: Uri,
 ) -> impl IntoResponse {
-    let room_id = format!("{room_short}/{room_slug}");
+    let Some(room_id) = slug_types::room_id_from_route_segment(&room_key) else {
+        return (StatusCode::NOT_FOUND, "bad room path").into_response();
+    };
     let Some(nav) = ThreadNav::from_room_id(&room_id) else {
         return (StatusCode::NOT_FOUND, "bad room path").into_response();
     };
diff --git a/server/src/html/search.rs b/server/src/html/search.rs
index 43e6ebf36cf0fe72c96f0f9d850bea51ac094c43..f01732f7edb32c68fcc10c39545c8f56476adb27 100644
--- a/server/src/html/search.rs
+++ b/server/src/html/search.rs
@@ -351,8 +351,8 @@ fn render_search_results(results: &SearchResults, query: &str) -> Markup {
                     ul class="search-posts" {
                         @for r in &results.posts {
                             @let (post_href, post_label) = if let Some((room, tag)) = r.thread.split_once("/#") {
-                                if let Some((short, slug)) = room.split_once('/') {
-                                    (format!("/r/{short}/{slug}/t/{tag}"), format!("{room}/#{tag}"))
+                                if let Some(seg) = slug_types::room_route_segment(room) {
+                           

… preview truncated; 35,812 characters omitted

download full diff A

B — c_0c466eea1ed4 (tommy-mor)

message

[9e20d06c] Add sorterc dev tool for offline DSL compile and JSONL lint.

Introduce a workspace-only binary that validates .sorter files into ranking JSON and scans events.jsonl for corrupt or unreplayable ingests.

Co-authored-by: Cursor <cursoragent@cursor.com>

diff preview

diff --git a/Cargo.lock b/Cargo.lock
index bf8153d9c723af97122c9ffdd4a7cfe82e853bb6..a07734f089b466440c3ae6fc1087ce85fc24ce62 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1826,6 +1826,17 @@ dependencies = [
  "windows-sys 0.60.2",
 ]
 
+[[package]]
+name = "sorterc"
+version = "0.0.1"
+dependencies = [
+ "anyhow",
+ "clap",
+ "serde",
+ "serde_json",
+ "slugsocial-server",
+]
+
 [[package]]
 name = "spin"
 version = "0.9.8"
diff --git a/Cargo.toml b/Cargo.toml
index 149cbf07901eab57c593184ff8719a75d530f1da..25337acdd61e44b20f354c78fed4a88caf896280 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [workspace]
-members = ["server", "cli"]
+members = ["server", "cli", "sorterc"]
 resolver = "2"
 
 
diff --git a/agents.md b/agents.md
index d8b801e454fdf37e7ac6038b91a69f83b0746d59..ce646ed3cd7123be4732dccec4a6800467e651e7 100644
--- a/agents.md
+++ b/agents.md
@@ -93,6 +93,17 @@ SLUG_GOOGLE_CLIENT_SECRET=mock
 
 After OAuth completes, the pending-session poll returns a `slug_…` bearer token for API calls.
 
+### Dev-only offline tooling
+
+**`sorterc`** — workspace binary, not published via npm. Compiles `.sorter` files and lints `events.jsonl` without a server:
+
+```
+cargo run -p sorterc -- compile path/to/doc.sorter [--base events.jsonl] [--room public] [--pretty]
+cargo run -p sorterc -- scan path/to/events.jsonl [--pretty]
+```
+
+`compile` validates DSL, simulates ingest against empty (or `--base`) reducer state, and prints JSON rankings. `scan` reports corrupt JSONL lines and ingests that fail DSL replay.
+
 ### Testing
 
 - **Rust tests:** `cargo nextest run --workspace` (163 tests; requires `cargo-nextest`)
diff --git a/server/src/lib.rs b/server/src/lib.rs
index c1d477d21aea03aff00e6f0689b0b4379d0d68d2..ad8e31099c807fb5844acb16cd5086a2f19327a7 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -10,6 +10,7 @@ pub mod form_template;
 pub mod html;
 pub mod identity;
 pub mod middleware;
+pub mod offline;
 pub mod path_types;
 pub mod ranking;
 pub mod reducer;
diff --git a/server/src/offline.rs b/server/src/offline.rs
new file mode 100644
index 0000000000000000000000000000000000000000..54ad0ded096a305ef8454ab2cdd1c3af71b14f5d
--- /dev/null
+++ b/server/src/offline.rs
@@ -0,0 +1,333 @@
+//! Offline `.sorter` compilation and JSONL diagnostics (no network, no auth).
+
+use std::collections::HashSet;
+use std::path::Path;
+
+use serde::Serialize;
+use slug_types::{CheckScopeRanking, RankComponent, RankRow, paths::GardenItemUrl};
+
+use crate::{
+    api::{resolve_item, validate_ingest_document},
+    dsl,
+    events::{Event, Ingest},
+    path_types::ItemId,
+    reducer::{ReducerState, ScopeId, scope_from_room_wire},
+    scope_rank::build_children_rankings,
+};
+
+#[derive(Debug, Clone, Serialize)]
+pub struct CompileStats {
+    pub items: usize,
+    pub votes: usize,
+    pub prose_blocks: usize,
+}
+
+#[derive(Debug, Serialize)]
+pub struct CompileResult {
+    pub ok: bool,
+    pub threads: Vec<String>,
+    pub rankings: Vec<CheckScopeRanking>,
+    pub stats: CompileStats,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct CompileError {
+    pub ok: bool,
+    pub error: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub hint: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct BadJsonLine {
+    pub line: usize,
+    pub message: String,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct MalformedIngest {
+    pub line: usize,
+    pub id: String,
+    pub room_id: String,
+    pub thread_tag: String,
+    pub reason: String,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct ScanResult {
+    pub ok: bool,
+    pub path: String,
+    pub total_lines: usize,
+    pub parsed_events: usize,
+    pub bad_json_lines: Vec<BadJsonLine>,
+    pub malformed_ingests: Vec<MalformedIngest>,
+    pub skipped_ingests: usize,
+}
+
+fn document_stats(doc: &dsl::Document) -> CompileStats {
+    let mut items = 0usize;
+    let mut votes = 0usize;
+    let mut prose_blocks = 0usize;
+    for stmt in &doc.statements {
+        match stmt {
+            dsl::Stmt::Item { .. } => items += 1,
+            dsl::Stmt::Vote { .. } => votes += 1,
+            dsl::Stmt::Prose { .. } => prose_blocks += 1,
+        }
+    }
+    CompileStats {
+        items,
+        votes,
+        prose_blocks,
+    }
+}
+
+fn threads_in_document(text: &str) -> Vec<String> {
+    let mut out = HashSet::new();
+    for line in text.lines() {
+        let trimmed = line.trim();
+        if !trimmed.starts_with('#') {
+            continue;
+        }
+        let rest = trimmed.trim_start_matches('#').trim();
+        if rest.is_empty() {
+            continue;
+        }
+        let tag = rest.split_whitespace().next().unwrap_or(rest);
+        let tag = tag.split(':').next().unwrap_or(tag).trim();
+        if tag.is_empty() {
+            continue;
+        }
+        out.insert(format!("#{}", crate::canonical_path::canonicalize_tag(tag)));
+    }
+    let mut tags: Vec<String> = out.into_iter().collect();
+    tags.sort();
+    tags
+}
+
+fn voted_parent_scopes(doc: &dsl::Document) -> Vec<ItemId> {
+    let mut parents = HashSet::new();
+    for stmt in &doc.statements {
+        if let dsl::Stmt::Vote { item1, item2, .. } = stmt {
+            if let (Ok(a), Ok(b)) = (resolve_item(item1), resolve_item(item2)) {
+                if let Some(p) = a.parent() {
+                    parents.insert(p);
+                }
+                if let Some(p) = b.parent() {
+                    parents.insert(p);
+                }
+            }
+        }
+    }
+    let mut out: Vec<ItemId> = parents.into_iter().collect();
+    out.sort();
+    out
+}
+
+fn rankings_for_simulated(
+    simulated: &ReducerState,
+    scope: &ScopeId,
+    room_wire: &str,
+    doc: &dsl::Document,
+) -> Vec<CheckScopeRanking> {
+    voted_parent_scopes(doc)
+        .iter()
+        .map(|parent| {
+            let scoped_content = simulated
+                .content_for_scope(&scope)
+                .unwrap_or_else(|| simulated.public());
+            let scoped = build_children_rankings(scoped_content, parent);
+            let components: Vec<RankComponent> = scoped
+                .component_rankings
+                .into_iter()
+                .map(|comp| RankComponent {
+                    pairs: comp.pairs,
+                    ranking: comp
+                        .ranked
+                        .into_iter()
+                        .map(|r| RankRow {
+                            item: GardenItemUrl::from_stored(&r.item, room_wire),
+                            score: r.score,
+                            percent: None,
+                        })
+                        .collect(),
+                })
+                .collect();
+            CheckScopeRanking {
+                parent: GardenItemUrl::from_stored(parent, room_wire).into_inner(),
+                components,
+                unranked_items: scoped
+                    .unranked_items
+                    .into_iter()
+                    .map(|it| GardenItemUrl::from_stored(&it, room_wire))
+                    .collect(),
+            }
+        })
+        .collect()
+}
+
+/// Validate and simulate one `.sorter` document against optional base reducer state.
+pub fn compile_document(
+    base: &ReducerState,
+    room: &str,
+    text: &str,
+) -> Result<CompileResult, CompileError> {
+    let room_key = room.trim();
+    let scope = scope_from_room_wire(room_key);
+    let validated = validate_ingest_document(base, text, &scope).map_err(|(_, message, hint)| {
+        CompileError {
+            ok: false,
+            error: message,
+            hint,
+        }
+    })?;
+
+    let event = Event::Ingest(Ingest {
+        ts: validated.ts,
+        id: uuid::Uuid::new_v4().to_string(),
+        raw: validated.raw_text.clone(),
+        principal: "offline".to_string(),
+        delegate: None,
+        room_id: room_key.to_string(),
+        thread_tag: "offline".to_string(),
+    });
+
+    let mut simulated = base.clone();
+    simulated.apply_event(event);
+
+    Ok(CompileResult {
+        ok: true,
+        threads: threads_in_document(text),
+        rankings: rankings_for_simulated(&simulated, &scope, room_key, &validated.doc),
+        stats: document_stats(&validated.doc),
+    })
+}
+
+fn ingest_parse_error(raw: &str) -> Option<String> {
+    dsl::parse_full(raw).err().map(|e| e.to_string())
+}
+
+fn load_events_from_jsonl(path: &Path) -> Result<(Vec<(usize, Event)>, Vec<BadJsonLine>), std::io::Error> {
+    let text = std::fs::read_to_string(path)?;
+    let mut events = Vec::new();
+    let mut bad_json_lines = Vec::new();
+    for (idx, line) in text.lines().enumerate() {
+        let line_no = idx + 1;
+        let trimmed = line.trim();
+        if trimmed.is_empty() {
+            continue;
+        }
+        match serde_json::from_str::<Event>(trimmed) {
+            Ok(ev) => events.push((line_no, ev)),
+            Err(e) => bad_json_lines.push(BadJsonLine {
+                line: line_no,
+                message: e.to_string(),
+            }),
+        }
+    }
+    Ok((events, bad_json_lines))
+}
+
+/// Replay a JSONL event log into reducer state (same rules as server boot).
+pub fn load_reducer_from_jsonl(path: &Path) -> Result<(ReducerState, Vec<BadJsonLine>), std::io::Error> {
+    let (events, bad_json_lines) = load_events_from_jsonl(path)?;
+    let mut state = ReducerState::default();
+    for (_line_no, ev) in events {
+        state.apply_event(ev);
+    }
+    Ok((state, bad_json_lines))
+}
+
+/// Scan an events.jsonl for corrupt JSON lines and ingests that fail DSL replay.
+pub fn scan_jsonl(path: &Path) -> Result<ScanResult, std::io::Error> {
+    let text = std::fs::read_to_string(path)?;
+    let total_lines = text.lines().count();
+    let (events, bad_json_lines) = load_events_from_jsonl(path)?;
+
+    let mut malformed_ingests = Vec::new();
+    let mut skipped_ingests = 0usize;
+    let mut state = ReducerState::default();
+    let parsed_events = events.len();
+
+    for (line_no, ev) in events {
+        if let Event::Ingest(ref ing) = ev {
+            if let Some(reason) = ingest_parse_error(&ing.raw) {
+                malformed_ingests.push(MalformedIngest {
+                    line: line_no,
+                    id: ing.id.clone(),
+                    room_id: ing.room_id.clone(),
+                    thread_tag: ing.thread_tag.clone(),
+                    reason,
+                });
+            }
+            let before = state.ingests_by_id.len();
+            state.apply_event(ev);
+            if state.ingests_by_id.len() == before {
+                skipped_ingests += 1;
+            }
+        } else {
+            state.apply_event(ev);
+        }
+    }
+
+    let ok = bad_json_lines.is_empty() && malformed_ingests.is_empty() && skipped_ingests == 0;
+
+    Ok(ScanResult {
+        ok,
+        path: path.display().to_string(),
+        total_lines,
+        parsed_events,
+        bad_json_lines,
+        malformed_ingests,
+        skipped_ingests,
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const TUTORIAL: &str = include_str!("../tests/fixtures/tutorial.sorter");
+
+    #[test]
+    fn compile_tutorial_fixture_emits_rankings() {
+        let result = compile_document(&ReducerState::default(), "public", TUTORIAL).unwrap();
+        assert!(result.ok);
+        assert!(!result.threads.is_empty());
+        assert!(result.stats.items >= 6);
+        assert!(result.stats.votes >= 6);
+        assert!(!result.rankings.is_empty());
+    }
+
+    #[test]
+    fn compile_rejects_vote_on_missing_item() {
+        let err = compile_document(
+            &ReducerState::default(),
+            "public",
+            "{ reason }\n~/missing/a 2:1 ~/missing/b",
+        )
+        .unwrap_err();
+        assert!(!err.ok);
+        assert!(err.error.contains("undefined"));
+    }
+
+    #[test]
+    fn scan

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