constitution · epochs · watch · epoch 3

comparison

c_7ec67b9cef2c (tommy-mor) vs c_e57094c6229a (tommy-mor)

download prompt · raw event · cmp_7c5171a9c11e77

council reasoning

~anthropic/claude-sonnet-latest · winner B · 8:2 · permalink

Side B is a real, working feature: it introduces explicit user-initiated Reddit fetch (removing implicit auto-fetch), persists full API payloads via a new EntityImported event with replay support, adds config for API bases/env-based creds, UI wiring, tests (unit + integration), and a fixture. Side A is purely a planning document plus a thin RouteContext wrapper that isn't yet adopted anywhere, offering no functional change or bugfix—mostly aspirational scaffolding.

~x-ai/grok-latest · winner B · 1:6 · permalink

B ships a durable entity-import path (EntityImported events, raw payload + derived view, explicit FetchEntity UI, configurable Reddit broker, replay/tests/fixtures), while A mainly adds a forward-looking plan.md and a thin RouteContext newtype that still delegates to CanonicalItemUrl/ThreadNav without finishing the migration.

openai/gpt-chat-latest · winner B · 5:1 · permalink

Side B implements substantial new functionality: it replaces automatic Reddit fetches with explicit user-triggered imports, persists full upstream payloads via a new `EntityImported` event for replay, updates the reducer to store raw payloads plus derived views, and adds configuration, tests, and UI support for the workflow. Side A mainly adds a detailed planning document and introduces a thin `RouteContext` wrapper re-exported from the HTML module, which is useful for future work but does not materially change project behavior yet.

sides

A — c_7ec67b9cef2c (tommy-mor)

message

[1c914c6e] stage set

diff preview

diff --git a/plan.md b/plan.md
new file mode 100644
index 0000000000000000000000000000000000000000..00d6867a1e0ed144a16a020ea037f685ce646c73
--- /dev/null
+++ b/plan.md
@@ -0,0 +1,155 @@
+# Plan: `ItemId` + `RouteContext` (identity vs hrefs)
+
+This document is for **the next agent** to continue the refactor without re-deriving context from chat. It supersedes ad-hoc notes: treat it as the checklist of record until the work lands and this file is deleted or trimmed.
+
+## Goal
+
+- **Identity** (what lives in the reducer graph, votes, indexes) becomes a **structural `ItemId` enum** in `slug-types`, not a canonical `String` / `CanonicalItemUrl` newtype.
+- **Presentation** (tilde / dash display, breadcrumbs) derives from `ItemId` via explicit methods, not string stripping.
+- **Routing** (browser `href`s for public vs room) goes through **`RouteContext`** (started in `server/src/html/routing.rs`) so Maud/handlers do not stitch `/r/…` vs `/~` ad hoc.
+
+**Non-goals for v1 of the migration:** backward-compatible JSONL or dual-read of old canonical strings in the event log (project has accepted breaking changes). If you reintroduce compat, document it here.
+
+## Current state (as of this plan)
+
+- **`CanonicalItemUrl`** (`types/src/paths.rs`): newtype around `String`; `parse` / `parent` / `display_path` / `tilde_tail` / etc. Reducer `ContentState`, `VoteData`, ranking, RPC, search, garden, breadcrumbs all use it or `String` keys derived from it.
+- **`ThreadNav`** (`server/src/html/forum/nav.rs`): encodes scope prefixes for threads and garden URLs; **`RouteContext`** now wraps `ThreadNav` (`server/src/html/routing.rs`, re-exported from `server/src/html/mod.rs`) but **most HTML still takes `&ThreadNav` directly** — migration incomplete.
+- **URL normalization** lives in `types/src/url_normalize.rs` + `canonicalize_item` / `finalize_external_identity_url` in `paths.rs` (YouTube, sorted query params, room path `room_route_segment` in `paths.rs`).
+- **Room HTTP paths** are `/r/{short}{slug}` (fused segment); wire **`room_id`** remains `short/slug` for RPC/events.
+
+## Target architecture
+
+### `ItemId` (types)
+
+Suggested shape (adjust after profiling `Ord` / `Hash` / serde size):
+
+```text
+ItemId::Root                      — tilde ontology root (today `SLUG_TILDE_ONTOLOGY_ROOT`)
+ItemId::Local { segments }        — slug.social ~/… path as Vec<String> (lowercase segments, non-empty for non-root)
+ItemId::External { url: Url }    — normalized `url::Url` (crate `url` already in `slug-types`)
+```
+
+**API surface (minimum):**
+
+- `ItemId::parse(&str) -> Option<ItemId>` — single entry from DSL / user input / legacy wire (internally may call `canonicalize_item` + structured split).
+- `ItemId::to_wire_url(&self) -> String` — only for **external** boundaries if needed (HTTP fetch, rare assertions); avoid using as the primary key once maps use `ItemId`.
+- `parent`, `display_path`, `tilde_tail` / `tilde_http_tail`, `tilde_segments`, `last_segment`, `normalized_storage` — port from `CanonicalItemUrl`.
+- **`Ord` + `Hash` + `Eq`** stable for `BTreeSet` / `HashMap` (see `write_actor` scope-rank snapshots).
+- **`Serialize` / `Deserialize`** — decide **tagged JSON** for any persisted or API-carried structs (e.g. `VoteData` in tests). If RPC must stay stringy for clients, use a **DTO layer** that converts `ItemId` ↔ wire at the boundary only.
+
+**Remove:** `CanonicalItemUrl` type and all `path_types::CanonicalItemUrl` / `slug_types::paths::CanonicalItemUrl` exports once call sites are migrated. **`Borrow<str>`** on the old newtype goes away; update `nav!` / any code that assumed map keys borrowed as `str`.
+
+### `RouteContext` (server HTML)
+
+- **File:** `server/src/html/routing.rs` — **`RouteContext(ThreadNav)`** with `item_href`, `item_href_raw`, `thread_url`, `garden_root_url`, `room_url`, `From`/`Into` `ThreadNav`.
+- **Direction:** new code and refactored Maud should take **`&RouteContext`** (or owned where appropriate) instead of `&ThreadNav` when building links. Long term, **`item_href(&ItemId)`** should not parse strings — it should pattern-match `ItemId` and append tilde tail or `/-/…` external tail using the same rules as today’s `ThreadNav::garden_item_url`.
+
+### Axum / garden routes
+
+- **No** single catch-all route (explicit decision): keep the existing router layout in `server/src/lib.rs`.
+- Room routes stay **`/r/:room_key/...`** with `room_key` fused; parsing via `slug_types::room_id_from_route_segment` / `room_route_segment` in `paths.rs`.
+
+## Phased execution (recommended order)
+
+### Phase 0 — Preconditions (quick)
+
+1. Read **`AGENTS.md`** (UI contract, durability matrix, `RpcCommand` vs `HtmlUiAction`).
+2. Run **`cargo test --workspace`** and **`./scripts/clj-test.sh`** on clean `main` before large diffs; repeat after each phase.
+
+### Phase 1 — `ItemId` in `slug-types` (no server yet)
+
+1. Add **`ItemId`** (new file e.g. `types/src/item_id.rs` **or** inline at bottom of `paths.rs` — see **Module cycle** below).
+2. Implement **`ItemId::parse`** using existing **`canonicalize_item`** + normalization; port **`CanonicalItemUrl`** methods to **`ItemId`** with tests ported from `paths.rs` `#[cfg(test)] mod tests`.
+3. **`GardenItemUrl::from_stored(&ItemId, room_wire)`** (and thread helpers) — build absolute hrefs from structure, not from re-parsing a canonical string.
+4. **`TildeHttpPathTail::to_item_id`** (rename from `to_canonical`) / **`tilde_http_path_to_item_id`**.
+5. **`TildeOntologyPath::from_stored(&ItemId)`**.
+6. Export **`ItemId`** from **`types/src/lib.rs`**; update **`server/src/path_types.rs`** re-exports.
+7. **Delete `CanonicalItemUrl`** and fix all **in-crate** references in `types` only until `cargo test` passes for `slug-types`.
+
+**Module cycle trap:** `item_id.rs` must not `use crate::paths::{...}` if `paths.rs` also imports `ItemId` for `GardenItemUrl` in the same module. **Fix one of:**
+
+- **A)** Put `ItemId` **inside `paths.rs`** below `canonicalize_item` / helpers (simplest, large file), or  
+- **B)** Split **`canonicalize_item`** (+ dash host helpers + `finalize_external_identity_url`) into **`types/src/item_wire.rs`**, then `paths.rs` + `item_id.rs` both depend on `item_wire` only (cleaner, more files).
+
+### Phase 2 — Reducer + ranking (server core)
+
+1. **`server/src/reducer.rs`**: `ContentState` / `GroupState` / **`VoteData`** — replace **`CanonicalItemUrl`** with **`ItemId`** on all maps, sets, deques, vectors.
+2. **`apply_vote`**: normalize `a`/`b` via **`ItemId::parse`** or **`ItemId`**-aware logic (remove string round-trip).
+3. **`apply_ingest_to_content`**: **`dsl`** still yields strings for item titles in statements; normalize to **`ItemId`** at ingest boundary via **`ItemId::parse`** once per item.
+4. **`server/src/ranking.rs`**, **`server/src/scope_rank.rs`**, **`server/src/api/write_actor.rs`** (including **`BTreeSet`** ordering), **`server/src/api/validate.rs`**, **`server/src/api/helpers.rs`** — propagate **`ItemId`**.
+5. **`server/tests/basic.rs`** and any reducer tests constructing **`VoteData`** — use **`ItemId::parse(...).unwrap()`** or helpers.
+
+### Phase 3 — RPC + search + external resolver
+
+1. **`server/src/api/rpc.rs`**: rank/pair/matchup/search payloads; today many paths use **`GardenItemUrl::from_storage_str(item.as_str(), …)`** — switch to **`ItemId`** + **`GardenItemUrl::from_stored(&item_id, …)`** (or equivalent).
+2. **`server/src/html/search.rs`**: scoring uses item path strings — derive from **`ItemId::display_path`** / **`to_wire_url`** only at the scoring boundary if needed.
+3. **`server/src/external_resolver.rs`**: take **`&ItemId`** or **`ItemId::external_url()`** instead of **`&CanonicalItemUrl`**.
+
+### Phase 4 — HTML / Maud
+
+1. **`ThreadNav::garden_item_url`**: overload or replace with **`garden_item_href(&self, item: &ItemId)`** (no `CanonicalItemUrl::parse` inside).
+2. **`RouteContext`**: extend **`item_href(&ItemId)`**; migrate call sites from **`ThreadNav`** to **`RouteContext`** where only link-building is needed (keep **`ThreadNav`** where scope / auth helpers need the full struct).
+3. **`server/src/html/garden.rs`**, **`breadcrumb_path.rs`**, **`forum/*`**, **`editor.rs`**: replace **`CanonicalItemUrl`** with **`ItemId`**; breadcrumbs should walk **`ItemId::parent`** without string `rsplit`.
+4. **`types` JSON types** (`RankRow`, etc.): decide whether **`GardenItemUrl`** stays string for JSON or becomes a structured field; keep **one** wire format for the public API.
+
+### Phase 5 — Cleanup + docs
+
+1. Remove dead **`canonical_path`** / **`breadcrumb_path`** string logic if fully superseded.
+2. Update **`AGENTS.md`** if durability, `POST /ui`, or command surfaces change.
+3. Delete or shrink **`plan.md`** when done.
+
+## File / symbol checklist (non-exhaustive — grep-driven)
+
+Run periodically:
+
+```bash
+rg "CanonicalItemUrl" -g'*.rs'
+rg "path_types::CanonicalItemUrl" -g'*.rs'
+rg "tilde_http_path_to_canonical" -g'*.rs'
+```
+
+**High-touch files (from prior exploration):**
+
+| Area | Files |
+|------|--------|
+| Types | `types/src/paths.rs`, `types/src/lib.rs`, `types/src/url_normalize.rs`, (optional) `types/src/item_id.rs`, `types/src/item_wire.rs` |
+| Server re-exports | `server/src/path_types.rs`, `server/src/canonical_path.rs` |
+| Reducer / ingest | `server/src/reducer.rs`, `server/src/dsl.rs` (parse output types if changed) |
+| Ranking | `server/src/ranking.rs`, `server/src/scope_rank.rs` |
+| Writer / RPC | `server/src/api/write_actor.rs`, `server/src/api/rpc.rs`, `server/src/api/helpers.rs`, `server/src/api/validate.rs` |
+| HTML | `server/src/html/garden.rs`, `server/src/html/breadcrumb_path.rs`, `server/src/html/forum/nav.rs`, `server/src/html/routing.rs`, `server/src/html/search.rs`, `server/src/html/editor.rs`, `server/src/html/forum/ingest.rs`, … |
+| Tests | `server/tests/basic.rs`, `server/tests/integration.rs`, `types/src/paths.rs` tests, Clojure under `test/` if URLs/assertions mention canonical shapes |
+
+## Events / JSONL
+
+- **`Ingest`** events store **`raw` DSL** only — no change required for item identity inside the event.
+- If any future event type stores item ids as strings, migrate to **structured `ItemId` serde** or accept string only at the event boundary with immediate parse into **`ItemId`** on `apply_event`.
+
+## `nav!` macro (`server/src/paths.rs`)
+
+- Macros use **`keypath($key)`** with **`.clone()`** — **`ItemId`** must be **`Clone`** (already for enums). Remove any reliance on **`Borrow<str>`** for map keys.
+
+## Testing gate
+
+After each phase:
+
+```bash
+cargo test --workspace
+./scripts/clj-test.sh
+```
+
+## Risks / gotchas
+
+1. **`Ord` on `ItemId`**: must match prior **`CanonicalItemUrl`** / `String` ordering wherever **`BTreeSet`** is used (e.g. deterministic scope-rank snapshots in **`write_actor`**).
+2. **External `ItemId`**: **`Url`** equality / hashing — normalization is already centralized in **`url_normalize`**; ensure **`ItemId::parse`** always inserts normalized **`Url`** into **`External`**.
+3. **Fake parent URLs** in garden (e.g. **`https://.`** for external root ranking): find all **`parse("https://.")`** style hacks and express as **`ItemId`** or a dedicated sentinel.
+4. **Serde**: tests and any RPC clients that snapshot JSON may need expectation updates if **`VoteData`** shape changes.
+
+## Optional follow-ups (not blocking `ItemId`)
+
+- More **domain normalizers** in **`url_normalize.rs`** (e.g. `music.youtube.com`, Spotify, etc.).
+- **Room wire** vs **HTTP segment** helpers already in **`paths.rs`** (`ROOM_SHORT_ID_LEN`, `room_route_segment`, `room_id_from_route_segment`).
+
+---
+
+**End state criteria:** `rg CanonicalItemUrl` returns nothing; reducer maps use **`ItemId`**; HTML link generation for items goes through **`RouteContext` + `ItemId`**; tests and Kaocha green.
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index c3dccd03dc6da2a2f6f6fa828657e33a951884b

… preview truncated; 2,831 characters omitted

download full diff A

B — c_e57094c6229a (tommy-mor)

message

[40b975bf] nice

diff preview

diff --git a/Cargo.lock b/Cargo.lock
index 266e876bb7ccbe788beb1d5bd53ad5b45ee5825b..2cea973082716e761ef6f5dd5886acc08ff9aac0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -222,6 +222,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "dotenvy"
+version = "0.15.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.35"
@@ -1238,6 +1244,7 @@ version = "0.0.1"
 dependencies = [
  "axum",
  "axum-extra",
+ "dotenvy",
  "maud",
  "reqwest",
  "serde",
diff --git a/server/Cargo.toml b/server/Cargo.toml
index 4677fedcb45292eebebe7e9cf6ce2f5738f18ddf..bd600138b613bd0f546bdec217a5334cdcb20aa5 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -17,6 +17,7 @@ tower-http = { version = "0.5", features = ["trace"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 reqwest = { version = "0.12", features = ["json"] }
+dotenvy = "0.15"
 
 [dev-dependencies]
 reqwest = { version = "0.12", features = ["json"] }
diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index d2024bd4582bcc8482b461b2ba4fedbd8bff7c66..b33a84e8bb5e817b26592868d88090e6d664d950 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::{input_panel, js_string_literal, ranking_panel, JsBuilder},
+    html::{entity_section, input_panel, js_string_literal, ranking_panel, JsBuilder},
     parser::parse_reddit_url,
     path_types::ItemId,
     reddit::ensure_partial_tree,
@@ -87,6 +87,20 @@ pub async fn post_ui_html(
                     .into_response()
             }
         },
+        HtmlUiAction::FetchEntity { item } => {
+            let id = parse_item_param(&item);
+            if id.is_root() {
+                return ui_js_warn("nothing to fetch for the root").into_response();
+            }
+            state.queue_entity_fetch(id.clone());
+            let tree = state.tree.read().await;
+            let empty = crate::reducer::NodeState::default();
+            let node = tree.get(&id).unwrap_or(&empty);
+            let panel = entity_section(&id, node, true);
+            JsBuilder::new()
+                .morph_selector("#entity-section", panel)
+                .into_response()
+        },
     }
 }
 
diff --git a/server/src/events.rs b/server/src/events.rs
index ed5be6b13b9d46e838831d6ce0f96f569b401730..07ce24b5e56cf72b0b442c3c3241efbf6c3b006a 100644
--- a/server/src/events.rs
+++ b/server/src/events.rs
@@ -1,4 +1,5 @@
 use serde::{Deserialize, Serialize};
+use serde_json::Value;
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
@@ -18,4 +19,10 @@ pub enum Event {
     },
     /// Register a node path in the fractal tree (no external fetch).
     NodeEnsured { id: String },
+    /// Full upstream API payload for a node (domain-specific view derived at replay/render time).
+    EntityImported {
+        id: String,
+        ts: i64,
+        payload: Value,
+    },
 }
diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index df6505021d9f446c2b453e20e3eb3cf696a111f9..caf1309c8d93b47104499c57f9cc35ee7631fbb9 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -10,6 +10,7 @@ use crate::{
     form_template::template_json_compact,
     path_types::ItemId,
     ranking::{top_bottom, RankedItem},
+    reddit::is_fetchable,
     reducer::{GroupState, NodeState},
     state::AppState,
     ui_action::UI_RPC_FIELD,
@@ -151,7 +152,7 @@ pub fn breadcrumb_path(item: &ItemId) -> Markup {
 fn entity_panel(node: &NodeState) -> Markup {
     html! {
         @if let Some(data) = &node.data {
-            section id="entity-panel" class="demo-panel entity-card" {
+            div id="entity-panel" class="entity-card" {
                 h2 { (data.title) }
                 @if let Some(author) = &data.author {
                     p class="muted small" { "by " (author) }
@@ -164,6 +165,42 @@ fn entity_panel(node: &NodeState) -> Markup {
     }
 }
 
+/// Reddit/API import control — only shown on fetchable pages; never auto-fires.
+pub fn fetch_entity_panel(item: &ItemId, has_data: bool, fetching: bool) -> Markup {
+    if !is_fetchable(item) {
+        return html! {};
+    }
+    let label = if fetching {
+        "Fetching…"
+    } else if has_data {
+        "Fetch more"
+    } else {
+        "Fetch from Reddit"
+    };
+    let rpc = template_json_compact(&serde_json::json!({
+        "action": "fetch_entity",
+        "item": item.as_str(),
+    }))
+    .expect("fetch_entity rpc template");
+    html! {
+        form method="post" action="/ui" id="fetch-entity-form" class="fetch-entity-form" {
+            input type="hidden" name=(UI_RPC_FIELD) value=(rpc);
+            button type="submit" class="btn-secondary" disabled=(fetching) { (label) }
+        }
+    }
+}
+
+/// Entity card + explicit fetch control (morphed as `#entity-section`).
+pub fn entity_section(item: &ItemId, node: &NodeState, fetching: bool) -> Markup {
+    let has_data = node.data.is_some();
+    html! {
+        section id="entity-section" class="demo-panel" {
+            (entity_panel(node))
+            (fetch_entity_panel(item, has_data, fetching))
+        }
+    }
+}
+
 fn rank_list(label: &str, items: &[RankedItem], start_rank: usize) -> Markup {
     html! {
         @if !items.is_empty() {
@@ -260,7 +297,7 @@ async fn item_page(state: AppState, uri: Uri, item: ItemId) -> Markup {
         h1 { "sorter" }
         (input_panel("", None))
         (breadcrumb_path(&item))
-        (entity_panel(node))
+        (entity_section(&item, node, false))
         (ranking_panel(&item, group))
     };
     layout("sorter2", body, views)
@@ -272,16 +309,5 @@ pub async fn home(State(state): State<AppState>, uri: Uri) -> impl IntoResponse
 
 pub async fn browse(State(state): State<AppState>, uri: Uri) -> impl IntoResponse {
     let item = ItemId::from_browse_uri(uri.path()).unwrap_or(ItemId::root());
-    if item.as_str().starts_with("reddit.com") {
-        let needs_fetch = {
-            let tree = state.tree.read().await;
-            tree.get(&item)
-                .map(|n| n.data.is_none())
-                .unwrap_or(true)
-        };
-        if needs_fetch {
-            state.reddit.request_fetch(item.clone());
-        }
-    }
     item_page(state, uri, item).await
 }
diff --git a/server/src/main.rs b/server/src/main.rs
index c22ec6c9f5358e5ec99fb83210dc351938505a93..1f0cddc39302b35b0cd6a6219f44c9d59202facf 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -2,6 +2,10 @@ use sorter2_server::state::AppConfig;
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+    if std::env::var("SORTER2_SKIP_DOTENV").is_err() {
+        let _ = dotenvy::dotenv();
+    }
+
     tracing_subscriber::fmt()
         .with_env_filter(
             tracing_subscriber::EnvFilter::try_from_default_env()
diff --git a/server/src/reddit.rs b/server/src/reddit.rs
index 90053ad03b1d7c8e94f325dd4ee64c2b4f7da900..ff0f01e57b18af878eb5be3efc47204a7673589d 100644
--- a/server/src/reddit.rs
+++ b/server/src/reddit.rs
@@ -6,11 +6,15 @@ use std::time::{Duration, Instant};
 
 use reqwest::{header, Client, StatusCode};
 use serde::Deserialize;
+use serde_json::Value;
 use tokio::sync::{mpsc, RwLock};
 
 use crate::{
+    event_log::EventLog,
+    events::Event,
+    html::now_ms,
     path_types::ItemId,
-    reducer::{EntityData, GlobalTree},
+    reducer::GlobalTree,
 };
 
 /// Bootstrap blank nodes along a URL path so breadcrumbs and voting work before fetch.
@@ -20,6 +24,8 @@ pub fn ensure_partial_tree(tree: &mut GlobalTree, id: &ItemId) {
 
 pub struct RedditCommand {
     pub id: ItemId,
+    /// User-initiated fetch bypasses the in-memory "recently fetched" cache.
+    pub force: bool,
 }
 
 #[derive(Clone)]
@@ -33,19 +39,31 @@ struct RedditCredentials {
     client_secret: String,
 }
 
+#[derive(Clone)]
+pub struct RedditApiConfig {
+    pub api_base: String,
+    pub oauth_base: String,
+    pub user_agent: String,
+    creds: Option<RedditCredentials>,
+}
+
 struct OAuthToken {
     access_token: String,
     expires_at: Instant,
 }
 
 impl RedditBroker {
-    pub fn spawn(tree: Arc<RwLock<GlobalTree>>, user_agent: &str) -> Self {
+    pub fn spawn(
+        tree: Arc<RwLock<GlobalTree>>,
+        event_log: Arc<EventLog>,
+        config: RedditApiConfig,
+    ) -> Self {
         let (tx, rx) = mpsc::channel(100);
 
         let mut headers = header::HeaderMap::new();
         headers.insert(
             header::USER_AGENT,
-            header::HeaderValue::from_str(user_agent).expect("valid user agent"),
+            header::HeaderValue::from_str(&config.user_agent).expect("valid user agent"),
         );
 
         let client = Client::builder()
@@ -54,22 +72,38 @@ impl RedditBroker {
             .build()
             .expect("reqwest client");
 
-        let creds = RedditCredentials::from_env();
-        tokio::spawn(reddit_worker(rx, tree, client, creds));
+        tokio::spawn(reddit_worker(rx, tree, event_log, client, config));
 
         Self { tx }
     }
 
-    /// Fire-and-forget: queue a fetch; worker updates the tree when done.
-    pub fn request_fetch(&self, id: ItemId) {
-        let _ = self.tx.try_send(RedditCommand { id });
+    /// Queue a fetch; drops when the channel is full (backpressure).
+    pub fn request_fetch(&self, id: ItemId, force: bool) {
+        let _ = self.tx.try_send(RedditCommand { id, force });
+    }
+}
+
+impl RedditApiConfig {
+    pub fn from_env() -> Self {
+        Self {
+            api_base: reddit_api_base(),
+            oauth_base: reddit_oauth_base(),
+            user_agent: default_user_agent(),
+            creds: RedditCredentials::from_env(),
+        }
     }
 }
 
 impl RedditCredentials {
+    /// Reddit's OAuth docs call these "client id" and "client secret"; the app
+    /// registration UI often labels them "app id" / "app secret" — same values.
     fn from_env() -> Option<Self> {
-        let client_id = std::env::var("REDDIT_CLIENT_ID").ok()?;
-        let client_secret = std::env::var("REDDIT_CLIENT_SECRET").ok()?;
+        let client_id = std::env::var("REDDIT_CLIENT_ID")
+            .or_else(|_| std::env::var("REDDIT_APP_ID"))
+            .ok()?;
+        let client_secret = std::env::var("REDDIT_CLIENT_SECRET")
+            .or_else(|_| std::env::var("REDDIT_APP_SECRET"))
+            .ok()?;
         if client_id.is_empty() || client_secret.is_empty() {
             return None;
         }
@@ -80,29 +114,63 @@ impl RedditCredentials {
     }
 }
 
+pub fn reddit_api_base() -> String {
+    std::env::var("REDDIT_API_BASE").unwrap_or_else(|_| "https://www.reddit.com".into())
+}
+
+pub fn reddit_oauth_base() -> String {
+    std::env::var("REDDIT_OAUTH_BASE").unwrap_or_else(|_| "https://www.reddit.com".into())
+}
+
 pub fn default_user_agent() -> String {
     std::env::var("REDDIT_USER_AGENT").unwrap_or_else(|_| {
         "web:sorter2.social:v0.0.1 (by /u/sorter2)".to_string()
     })
 }
 
+/// True when this node can be loaded from the Reddit JSON API.
+pub fn is_fetchable(id: &ItemId) -> bool {
+    !map_item_to_reddit_api(id, "https://example.com").is_empty()
+}
+
+/// Derive UI-facing fields from a stored payload (Reddit-specific when under reddit.com).
+pub fn entity_view_from_payload(id: &ItemId, payload: &Value) -> Option<crate::reducer::EntityData> {
+    if id.as_str().starts_with("reddit.com") {
+        return parse_reddit_view(id, payload);
+    }
+    None
+}
+
+/// Apply a full API payload to the in-memory tree (view derived for known domains).
+pub fn apply_entity_import(tree: &mut GlobalTree, id: &ItemId, payload: Value) {
+    let view = entity_view_from_payload(id, &payload);
+    tree.apply_entity_raw(id, payload, view);
+}
+
 async fn red

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