commit 2569596ca58859fccbebb58d3c3a422f308d94d8
Author: Mark Kalsbeek <Mark@Kalsbeek.dev>
Date:   Thu Mar 5 12:38:22 2026 +0100

    First Commit, it compiles!

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
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diff --git a/.gitignore b/.gitignore
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index 0000000..d7b0c5d
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+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e109ffc
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "livevue-rs"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum = { version = "0.7", features = ["macros"] }
+tokio = { version = "1", features = ["full"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+sqlx = { version = "0.8", features = ["runtime-tokio", "sqlite"] }
+maud = { version = "0.26", features = ["axum"] }
+uuid = { version = "1", features = ["v4", "serde"] }
+dashmap = "6"
+anyhow = "1"
+tokio-stream = "0.1"
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..2cebdcf
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,28 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    # Rust toolchain
+    cargo
+    rustc
+    rustfmt
+    clippy
+    rust-analyzer
+    
+    # Build dependencies 
+    pkg-config
+    
+    # Additional tools
+    cargo-watch
+    cargo-edit
+
+    # Profiling tools
+    cargo-flamegraph
+    samply
+    linuxPackages.perf
+
+  ];
+
+  # Environment variables
+  RUST_BACKTRACE = 1;
+}
diff --git a/src/app/about.rs b/src/app/about.rs
new file mode 100644
index 0000000..c696b5b
--- /dev/null
+++ b/src/app/about.rs
@@ -0,0 +1,47 @@
+use crate::framework::context::RenderContext;
+use maud::{html, Markup};
+
+/// Second page component: a simple "About" page.
+///
+/// This exists specifically to exercise:
+/// - The `tree` signal page routing (resolve_root match arm)
+/// - SPA-like navigation via tree signal mutation
+/// - Round-trip: TodoList → About → TodoList without full page reload
+///
+/// In a real app this might show user info, settings, etc.
+pub async fn about(_cx: &mut RenderContext) -> anyhow::Result<Markup> {
+    Ok(html! {
+        div.about-page {
+            h1 { "About LiveVue.rs" }
+
+            nav {
+                button.nav-link
+                    data-on-click="$tree = {page: 'TodoList'}; @post('/render')" {
+                    "Todos"
+                }
+                " | "
+                span.nav-current { "About" }
+            }
+
+            div.about-content {
+                p {
+                    "LiveVue.rs is a reactive server-side rendering framework for Rust. "
+                    "The server renders full-page HTML on every state change. "
+                    "DataStar morphs it into the DOM."
+                }
+                p {
+                    "The architectural bet: "
+                    strong { "full rerender is cheap" }
+                    ", so skip diffing, skip partial updates, skip client-side state management."
+                }
+                h2 { "v0 Status" }
+                ul {
+                    li { "Single process, single node" }
+                    li { "SQLite for storage" }
+                    li { "Subscription keys collected (Phase 2 seam)" }
+                    li { "No cache, no auth, no WAL consumer" }
+                }
+            }
+        }
+    })
+}
diff --git a/src/app/mod.rs b/src/app/mod.rs
new file mode 100644
index 0000000..20d8894
--- /dev/null
+++ b/src/app/mod.rs
@@ -0,0 +1,470 @@
+pub mod about;
+pub mod queries;
+pub mod todo_list;
+
+use crate::framework::connection::{ConnectionManager, SubscriptionRegistry};
+use crate::framework::context::{ComponentTree, RenderContext};
+use crate::framework::signal::SignalStore;
+use crate::framework::sse::{format_patch_elements, format_patch_signals};
+
+use axum::extract::{Query as AxumQuery, State};
+use axum::http::header;
+use axum::response::sse::{Event, KeepAlive, Sse};
+use axum::response::{Html, IntoResponse};
+use axum::routing::{get, post};
+use axum::{Json, Router};
+use std::convert::Infallible;
+use std::sync::Arc;
+use tokio::sync::mpsc;
+use tokio_stream::wrappers::ReceiverStream;
+use uuid::Uuid;
+
+// ---------------------------------------------------------------------------
+// Shared application state
+// ---------------------------------------------------------------------------
+
+/// All shared state, wrapped in Arc for axum's State extractor.
+pub struct AppState {
+    pub db: sqlx::SqlitePool,
+    pub connections: ConnectionManager,
+    pub subscriptions: SubscriptionRegistry,
+}
+
+pub type SharedState = Arc<AppState>;
+
+// ---------------------------------------------------------------------------
+// Router
+// ---------------------------------------------------------------------------
+
+/// Build the axum Router with all routes.
+///
+/// Lesson from v0.0: handlers live here next to the components they call,
+/// not in a separate routes.rs with complex trait object signatures.
+pub fn router(state: SharedState) -> Router {
+    Router::new()
+        .route("/", get(initial_page_load))
+        .route("/about", get(initial_about_load))
+        .route("/sse", get(sse_handler))
+        .route("/render", post(render_handler))
+        .route("/action/add_todo", post(action_add_todo))
+        .route("/action/toggle_todo", post(action_toggle_todo))
+        .route("/action/delete_todo", post(action_delete_todo))
+        .with_state(state)
+}
+
+// ---------------------------------------------------------------------------
+// Document shell
+// ---------------------------------------------------------------------------
+
+/// Wrap rendered component HTML in a full HTML document.
+///
+/// Lesson from v0.0: Maud can't handle DataStar's attribute syntax
+/// (e.g. `data-on-signal-change__debounce.300ms`). The document shell uses
+/// format! / raw string. Maud is for component interiors only.
+///
+/// DataStar v1 contract (verified against https://data-star.dev/reference):
+/// - `data-signals` — initialize signals (JS object literal syntax)
+/// - `data-on-signal-change` — fires when any signal changes
+/// - `__debounce.300ms` — modifier: debounce 300ms
+/// - `@post('/render')` — send all non-_ signals as JSON body
+/// - `@get('/sse?conn=...')` — open long-lived SSE pipe
+/// - `data-on-load` — fires when element enters DOM
+///
+/// KNOWN v0 QUIRK: Nav buttons use `$tree = {...}; @post('/render')`,
+/// which fires an immediate POST. The signal change handler then fires a
+/// second debounced POST 300ms later. This double-fire is harmless (same
+/// HTML both times) but wasteful. Phase 2 could fix this with request
+/// deduplication or by switching nav to only mutate the signal and relying
+/// solely on the auto-poster.
+fn document_shell(conn_id: Uuid, initial_signals: &str, inner_html: &str) -> String {
+    format!(
+        r#"<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>LiveVue.rs Demo</title>
+    <script type="module" src="https://cdn.jsdelivr.net/gh/starfederation/datastar@v1.0.0-RC.8/bundles/datastar.js"></script>
+    <style>
+        {css}
+    </style>
+</head>
+<body>
+    <div id="app"
+         data-signals='{signals}'
+         data-on-signal-change__debounce.300ms="@post('/render')"
+         data-on-load="@get('/sse?conn={conn}')">
+        {inner}
+    </div>
+</body>
+</html>"#,
+        css = INLINE_CSS,
+        signals = initial_signals,
+        conn = conn_id,
+        inner = inner_html,
+    )
+}
+
+/// Minimal CSS for the demo app. In a real app this would be a separate file.
+const INLINE_CSS: &str = r#"
+    body { font-family: system-ui, sans-serif; max-width: 600px; margin: 2rem auto; padding: 0 1rem; background: #fafafa; color: #333; }
+    h1 { color: #2563eb; }
+    nav { margin-bottom: 1.5rem; }
+    .nav-link { background: none; border: none; color: #2563eb; cursor: pointer; text-decoration: underline; font-size: inherit; padding: 0; }
+    .nav-current { font-weight: bold; }
+    .add-form { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
+    .add-form input { flex: 1; padding: 0.5rem; border: 1px solid #ccc; border-radius: 4px; }
+    .add-form button { padding: 0.5rem 1rem; background: #2563eb; color: white; border: none; border-radius: 4px; cursor: pointer; }
+    .add-form button:disabled { opacity: 0.5; cursor: not-allowed; }
+    .stats { color: #666; font-size: 0.9rem; }
+    .todo-list { list-style: none; padding: 0; }
+    .todo-item { display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem 0; border-bottom: 1px solid #eee; }
+    .todo-title { flex: 1; }
+    .todo-title.completed { text-decoration: line-through; color: #999; }
+    .delete-btn { background: none; border: none; color: #ef4444; cursor: pointer; font-size: 1.2rem; padding: 0 0.25rem; }
+    .empty { color: #999; font-style: italic; }
+    .about-content p { line-height: 1.6; }
+"#;
+
+// ---------------------------------------------------------------------------
+// Page resolution
+// ---------------------------------------------------------------------------
+
+/// Match a page name (from the `tree` signal) to its component function.
+///
+/// This is a plain match statement — no ComponentRegistry, no trait objects,
+/// no async lifetime gymnastics. The right call for a v0 with two pages.
+async fn resolve_and_render(cx: &mut RenderContext) -> anyhow::Result<String> {
+    let markup = match cx.tree.page.as_str() {
+        "TodoList" => todo_list::todo_list(cx).await?,
+        "About" => about::about(cx).await?,
+        other => maud::html! {
+            div {
+                h1 { "404 — Unknown page" }
+                p { "No component registered for: " (other) }
+                button.nav-link
+                    data-on-click="$tree = {page: 'TodoList'}; @post('/render')" {
+                    "Go to Todos"
+                }
+            }
+        },
+    };
+    Ok(markup.into_string())
+}
+
+/// Shared render pipeline used by both initial page load and POST /render.
+///
+/// Returns `(rendered_html, subscription_keys, signals_json)`.
+async fn render_page(
+    db: &sqlx::SqlitePool,
+    conn_id: Uuid,
+    signals: SignalStore,
+    tree: ComponentTree,
+) -> anyhow::Result<(String, Vec<crate::framework::CacheKey>, String)> {
+    let signals_json = signals.to_json_string();
+    let mut cx = RenderContext::new(conn_id, signals, tree, db.clone());
+    let html = resolve_and_render(&mut cx).await?;
+    let keys = cx.take_subscription_keys();
+    Ok((html, keys, signals_json))
+}
+
+// ---------------------------------------------------------------------------
+// Handlers
+// ---------------------------------------------------------------------------
+
+/// `GET /` — Initial page load for the todo list.
+async fn initial_page_load(State(state): State<SharedState>) -> impl IntoResponse {
+    let conn_id = Uuid::new_v4();
+
+    // Build initial signals
+    let tree = ComponentTree {
+        page: "TodoList".into(),
+        ..Default::default()
+    };
+    let signals = SignalStore::from_pairs(vec![
+        ("connId".into(), serde_json::json!(conn_id.to_string())),
+        ("tree".into(), serde_json::to_value(&tree).unwrap()),
+        ("newTodo".into(), serde_json::json!("")),
+    ]);
+
+    let initial_signals_attr = signals.to_data_signals_attr();
+
+    match render_page(&state.db, conn_id, signals, tree).await {
+        Ok((html, _keys, _signals_json)) => {
+            // Keys and signals_json are stored when SSE connects
+            Html(document_shell(conn_id, &initial_signals_attr, &html))
+        }
+        Err(e) => Html(document_shell(
+            conn_id,
+            &initial_signals_attr,
+            &format!("<p>Render error: {}</p>", e),
+        )),
+    }
+}
+
+/// `GET /about` — Initial page load for the about page.
+async fn initial_about_load(State(state): State<SharedState>) -> impl IntoResponse {
+    let conn_id = Uuid::new_v4();
+
+    let tree = ComponentTree {
+        page: "About".into(),
+        ..Default::default()
+    };
+    let signals = SignalStore::from_pairs(vec![
+        ("connId".into(), serde_json::json!(conn_id.to_string())),
+        ("tree".into(), serde_json::to_value(&tree).unwrap()),
+    ]);
+
+    let initial_signals_attr = signals.to_data_signals_attr();
+
+    match render_page(&state.db, conn_id, signals, tree).await {
+        Ok((html, _keys, _signals_json)) => {
+            Html(document_shell(conn_id, &initial_signals_attr, &html))
+        }
+        Err(e) => Html(document_shell(
+            conn_id,
+            &initial_signals_attr,
+            &format!("<p>Render error: {}</p>", e),
+        )),
+    }
+}
+
+/// Query params for the SSE endpoint.
+#[derive(serde::Deserialize)]
+struct SseParams {
+    conn: Uuid,
+}
+
+/// `GET /sse?conn=<uuid>` — Long-lived SSE pipe for server-initiated push.
+///
+/// In v0, nothing actively pushes events through this pipe (no invalidation
+/// events yet). It exists to:
+/// 1. Register the connection in ConnectionManager.
+/// 2. Keep the SSE connection alive (DataStar expects it).
+/// 3. Provide the Phase 2 seam for server-initiated rerenders.
+///
+/// On drop, the connection is cleaned up from both the ConnectionManager
+/// and the SubscriptionRegistry.
+async fn sse_handler(
+    State(state): State<SharedState>,
+    AxumQuery(params): AxumQuery<SseParams>,
+) -> Sse<impl tokio_stream::Stream<Item = Result<Event, Infallible>>> {
+    let conn_id = params.conn;
+
+    // Create a channel for sending events to this connection
+    let (tx, rx) = mpsc::channel::<String>(32);
+
+    // Clone sender for the cleanup watcher. Sender::closed() resolves when
+    // the receiver is dropped (i.e. client disconnects and the SSE stream
+    // drops). This is the proper cleanup mechanism — no arbitrary sleep.
+    let tx_watch = tx.clone();
+
+    // Register the connection
+    state.connections.insert(conn_id, tx);
+
+    // Spawn cleanup task: waits for the receiver to drop (client disconnect),
+    // then removes the connection from all registries.
+    let state_cleanup = state.clone();
+    tokio::spawn(async move {
+        tx_watch.closed().await;
+        state_cleanup.connections.remove(&conn_id);
+        state_cleanup.subscriptions.remove_connection(&conn_id);
+    });
+
+    // Convert the receiver into an SSE stream.
+    // DESIGN NOTE: For v0, the SSE pipe is mostly idle — POST /render
+    // returns SSE directly in its response, not through this pipe. This
+    // channel exists for Phase 2 server-initiated pushes (data invalidation).
+    // Messages sent via the channel should be plain content strings (not
+    // pre-formatted SSE); axum's Sse wrapper handles the SSE framing.
+    let stream = ReceiverStream::new(rx);
+    let event_stream = tokio_stream::StreamExt::map(stream, |msg| {
+        Ok(Event::default().data(msg))
+    });
+
+    Sse::new(event_stream).keep_alive(KeepAlive::default())
+}
+
+/// `POST /render` — Signal-triggered rerender.
+///
+/// DataStar sends all non-`_` signals as JSON body when any signal changes
+/// (triggered by `data-on-signal-change` + `@post('/render')`).
+///
+/// Returns `Content-Type: text/event-stream` with a single
+/// `datastar-patch-elements` event containing the full page HTML.
+async fn render_handler(
+    State(state): State<SharedState>,
+    Json(body): Json<serde_json::Value>,
+) -> impl IntoResponse {
+    let signals = SignalStore::from_json(body);
+
+    // Extract connection id
+    let conn_id: Uuid = signals
+        .get("connId")
+        .and_then(|v| v.as_str())
+        .and_then(|s| s.parse().ok())
+        .unwrap_or_else(Uuid::new_v4);
+
+    // Extract component tree
+    let tree: ComponentTree = signals
+        .get("tree")
+        .and_then(|v| serde_json::from_value(v.clone()).ok())
+        .unwrap_or_default();
+
+    match render_page(&state.db, conn_id, signals, tree).await {
+        Ok((html, keys, signals_json)) => {
+            // Update connection state
+            state.connections.update_signals(&conn_id, signals_json);
+            state.subscriptions.update(conn_id, keys);
+
+            let sse_body = format_patch_elements(&html);
+            (
+                [(header::CONTENT_TYPE, "text/event-stream")],
+                sse_body,
+            )
+                .into_response()
+        }
+        Err(e) => {
+            let error_html = format!(r#"<div id="app"><p>Render error: {}</p></div>"#, e);
+            let sse_body = format_patch_elements(&error_html);
+            (
+                [(header::CONTENT_TYPE, "text/event-stream")],
+                sse_body,
+            )
+                .into_response()
+        }
+    }
+}
+
+/// Query params for action endpoints that need an entity id.
+#[derive(serde::Deserialize)]
+struct ActionIdParams {
+    id: i64,
+}
+
+/// Helper: extract common fields from signal body, run a mutation, then rerender.
+///
+/// Returns an SSE response with the rerendered page.
+async fn action_then_render(
+    state: &AppState,
+    body: serde_json::Value,
+    mutation: impl std::future::Future<Output = anyhow::Result<()>> + Send,
+    patch_signals: Option<&str>,
+) -> impl IntoResponse {
+    let signals = SignalStore::from_json(body);
+
+    let conn_id: Uuid = signals
+        .get("connId")
+        .and_then(|v| v.as_str())
+        .and_then(|s| s.parse().ok())
+        .unwrap_or_else(Uuid::new_v4);
+
+    let tree: ComponentTree = signals
+        .get("tree")
+        .and_then(|v| serde_json::from_value(v.clone()).ok())
+        .unwrap_or_default();
+
+    // Run the mutation
+    if let Err(e) = mutation.await {
+        let error_html = format!(r#"<div id="app"><p>Action error: {}</p></div>"#, e);
+        return (
+            [(header::CONTENT_TYPE, "text/event-stream")],
+            format_patch_elements(&error_html),
+        )
+            .into_response();
+    }
+
+    // Rerender
+    match render_page(&state.db, conn_id, signals, tree).await {
+        Ok((html, keys, signals_json)) => {
+            state.connections.update_signals(&conn_id, signals_json);
+            state.subscriptions.update(conn_id, keys);
+
+            let mut sse_body = String::new();
+            // Optionally patch signals (e.g. clear the input)
+            if let Some(ps) = patch_signals {
+                sse_body.push_str(&format_patch_signals(ps));
+            }
+            sse_body.push_str(&format_patch_elements(&html));
+
+            (
+                [(header::CONTENT_TYPE, "text/event-stream")],
+                sse_body,
+            )
+                .into_response()
+        }
+        Err(e) => {
+            let error_html = format!(r#"<div id="app"><p>Render error: {}</p></div>"#, e);
+            (
+                [(header::CONTENT_TYPE, "text/event-stream")],
+                format_patch_elements(&error_html),
+            )
+                .into_response()
+        }
+    }
+}
+
+/// `POST /action/add_todo` — Create a new todo, then rerender.
+///
+/// Reads the `newTodo` signal from the POST body, inserts it, and sends
+/// back a `datastar-patch-signals` event to clear the input followed by
+/// a `datastar-patch-elements` event with the rerendered page.
+async fn action_add_todo(
+    State(state): State<SharedState>,
+    Json(body): Json<serde_json::Value>,
+) -> impl IntoResponse {
+    let title = body
+        .get("newTodo")
+        .and_then(|v| v.as_str())
+        .unwrap_or("")
+        .trim()
+        .to_string();
+
+    let db = state.db.clone();
+    action_then_render(
+        &state,
+        body,
+        async move {
+            if !title.is_empty() {
+                queries::create_todo(&db, &title).await?;
+            }
+            Ok(())
+        },
+        Some("{newTodo: ''}"), // Clear the input after adding
+    )
+    .await
+}
+
+/// `POST /action/toggle_todo?id=<i64>` — Toggle a todo's completed status.
+async fn action_toggle_todo(
+    State(state): State<SharedState>,
+    AxumQuery(params): AxumQuery<ActionIdParams>,
+    Json(body): Json<serde_json::Value>,
+) -> impl IntoResponse {
+    let db = state.db.clone();
+    let id = params.id;
+    action_then_render(
+        &state,
+        body,
+        async move { queries::toggle_todo(&db, id).await },
+        None,
+    )
+    .await
+}
+
+/// `POST /action/delete_todo?id=<i64>` — Delete a todo.
+async fn action_delete_todo(
+    State(state): State<SharedState>,
+    AxumQuery(params): AxumQuery<ActionIdParams>,
+    Json(body): Json<serde_json::Value>,
+) -> impl IntoResponse {
+    let db = state.db.clone();
+    let id = params.id;
+    action_then_render(
+        &state,
+        body,
+        async move { queries::delete_todo(&db, id).await },
+        None,
+    )
+    .await
+}
diff --git a/src/app/queries.rs b/src/app/queries.rs
new file mode 100644
index 0000000..7f8a963
--- /dev/null
+++ b/src/app/queries.rs
@@ -0,0 +1,75 @@
+use crate::framework::CacheKey;
+use serde::{Deserialize, Serialize};
+
+// ---------------------------------------------------------------------------
+// Models
+// ---------------------------------------------------------------------------
+
+/// A single todo item. Maps to the `todos` SQLite table.
+#[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
+pub struct Todo {
+    pub id: i64,
+    pub title: String,
+    pub completed: bool,
+}
+
+// ---------------------------------------------------------------------------
+// Read queries (go through cx.run / Query trait)
+// ---------------------------------------------------------------------------
+
+/// Fetch all todos, ordered by id.
+pub struct ListTodos;
+
+crate::query_all!(ListTodos {
+    sql: "SELECT id, title, completed FROM todos ORDER BY id",
+    params: [],
+    output: Todo,
+    cache: |_s: &ListTodos| CacheKey::Table { table: "todos" },
+});
+
+/// Fetch a single todo by id.
+pub struct GetTodo {
+    pub id: i64,
+}
+
+crate::query_one!(GetTodo {
+    sql: "SELECT id, title, completed FROM todos WHERE id = ?",
+    params: [|s: &GetTodo| s.id],
+    output: Todo,
+    cache: |s: &GetTodo| CacheKey::PrimaryKey { table: "todos", id: s.id },
+});
+
+// ---------------------------------------------------------------------------
+// Write operations (plain sqlx, not through Query trait)
+// ---------------------------------------------------------------------------
+//
+// Mutations don't go through cx.run() because they're not reads and don't
+// produce subscription keys. They're called directly by action handlers,
+// which then trigger a full rerender.
+
+/// Insert a new todo. Returns the new row's id.
+pub async fn create_todo(db: &sqlx::SqlitePool, title: &str) -> anyhow::Result<i64> {
+    let result = sqlx::query("INSERT INTO todos (title, completed) VALUES (?, false)")
+        .bind(title)
+        .execute(db)
+        .await?;
+    Ok(result.last_insert_rowid())
+}
+
+/// Toggle a todo's completed status.
+pub async fn toggle_todo(db: &sqlx::SqlitePool, id: i64) -> anyhow::Result<()> {
+    sqlx::query("UPDATE todos SET completed = NOT completed WHERE id = ?")
+        .bind(id)
+        .execute(db)
+        .await?;
+    Ok(())
+}
+
+/// Delete a todo by id.
+pub async fn delete_todo(db: &sqlx::SqlitePool, id: i64) -> anyhow::Result<()> {
+    sqlx::query("DELETE FROM todos WHERE id = ?")
+        .bind(id)
+        .execute(db)
+        .await?;
+    Ok(())
+}
diff --git a/src/app/todo_list.rs b/src/app/todo_list.rs
new file mode 100644
index 0000000..53fc86e
--- /dev/null
+++ b/src/app/todo_list.rs
@@ -0,0 +1,122 @@
+use crate::app::queries::{ListTodos, Todo};
+use crate::framework::context::RenderContext;
+use crate::framework::signal::{global, mangle};
+use maud::{html, Markup};
+
+/// Root page component: renders the full todo list with add form.
+///
+/// Reads signals:
+/// - `newTodo` (global, server-relevant): the text input value
+///
+/// Exercises:
+/// - `cx.run()` for data fetching
+/// - `cx.signal()` with `global()` scoping + `Signal::val` in expressions
+/// - `cx.signal()` with `mangle().client_only()` scoping (in todo_item)
+/// - DataStar `data-bind`, `data-on-click`, `data-attr` attributes
+/// - `@post()` actions for mutations
+pub async fn todo_list(cx: &mut RenderContext) -> anyhow::Result<Markup> {
+    // Fetch all todos
+    let todos = cx.run(ListTodos).await?;
+
+    // Global signal for the "new todo" input. This call does two things:
+    // 1. Records "newTodo" as a touched signal (for demangling tracking)
+    // 2. Returns a Signal struct whose .val is "$newTodo" for expressions
+    let new_todo = cx.signal("newTodo", global());
+
+    let todo_count = todos.len();
+    let done_count = todos.iter().filter(|t| t.completed).count();
+
+    Ok(html! {
+        div.todo-app {
+            h1 { "LiveVue.rs — Todo List" }
+
+            // Navigation link to About page (exercises tree signal + page routing)
+            nav {
+                span.nav-current { "Todos" }
+                " | "
+                button.nav-link
+                    data-on-click="$tree = {page: 'About'}; @post('/render')" {
+                    "About"
+                }
+            }
+
+            // Add todo form.
+            // data-bind-newTodo binds the input to the $newTodo signal.
+            // The button uses new_todo.val ("$newTodo") in a DataStar expression.
+            div.add-form {
+                input
+                    type="text"
+                    placeholder="What needs to be done?"
+                    data-bind-newTodo=""
+                    ;
+                button
+                    data-on-click="@post('/action/add_todo')"
+                    data-attr=(format!("{{disabled: {}.trim() === ''}}", new_todo.val)) {
+                    "Add"
+                }
+            }
+
+            // Stats
+            p.stats {
+                (format!("{} items, {} completed", todo_count, done_count))
+            }
+
+            // Todo items
+            ul.todo-list {
+                @for todo in &todos {
+                    (todo_item(cx, todo))
+                }
+            }
+
+            @if todos.is_empty() {
+                p.empty { "No todos yet. Add one above!" }
+            }
+        }
+    })
+}
+
+/// Renders a single todo item.
+///
+/// This is a static child component — called directly from `todo_list`,
+/// not resolved through the component registry.
+///
+/// Demonstrates per-instance, client-only signal via `mangle().client_only()`.
+fn todo_item(cx: &mut RenderContext, todo: &Todo) -> Markup {
+    // Per-instance, client-only signal for edit mode.
+    // Not used in v0 rendering, but demonstrates the mangled signal API
+    // and ensures it's tracked as touched. Produces: "_editing__<id>"
+    let _editing = cx.signal("editing", mangle(todo.id).client_only());
+
+    // Build class string server-side. Since we do a full rerender on every
+    // state change, there's no need for data-class here — the server knows
+    // whether the todo is completed.
+    let title_class = if todo.completed {
+        "todo-title completed"
+    } else {
+        "todo-title"
+    };
+
+    html! {
+        li.todo-item id=(format!("todo-{}", todo.id)) {
+            // Checkbox to toggle completion.
+            // `checked[expr]` is maud's syntax for conditional boolean attributes.
+            input
+                type="checkbox"
+                checked[todo.completed]
+                data-on-click=(format!("@post('/action/toggle_todo?id={}')", todo.id))
+                ;
+
+            // Title with strikethrough when completed (class set server-side)
+            span class=(title_class) {
+                (todo.title)
+            }
+
+            // Delete button
+            button.delete-btn
+                data-on-click=(format!("@post('/action/delete_todo?id={}')", todo.id))
+                {
+                "×"
+            }
+        }
+    }
+}
diff --git a/src/framework/connection.rs b/src/framework/connection.rs
new file mode 100644
index 0000000..7186ee1
--- /dev/null
+++ b/src/framework/connection.rs
@@ -0,0 +1,147 @@
+use crate::framework::query::CacheKey;
+use dashmap::DashMap;
+use std::collections::HashSet;
+use tokio::sync::mpsc;
+use uuid::Uuid;
+
+// ---------------------------------------------------------------------------
+// Connection state
+// ---------------------------------------------------------------------------
+
+/// Per-connection state stored in the manager.
+pub struct ConnectionState {
+    /// Sender half of the SSE channel. Messages written here get forwarded
+    /// to the client's long-lived SSE pipe (`GET /sse`).
+    pub sse_sender: mpsc::Sender<String>,
+
+    /// The full signal JSON from the most recent render for this connection.
+    /// Phase 2 uses this to re-enter the render pipeline on data invalidation
+    /// without a client request.
+    pub last_signals_json: Option<String>,
+}
+
+// ---------------------------------------------------------------------------
+// ConnectionManager
+// ---------------------------------------------------------------------------
+
+/// Concurrent map of connection_id → ConnectionState.
+///
+/// Accessed from:
+/// - `GET /sse` handler (insert)
+/// - `POST /render` handler (read sender, update signals)
+/// - SSE drop cleanup (remove)
+/// - Phase 2: invalidation handler (read sender + signals)
+pub struct ConnectionManager {
+    connections: DashMap<Uuid, ConnectionState>,
+}
+
+impl ConnectionManager {
+    pub fn new() -> Self {
+        Self {
+            connections: DashMap::new(),
+        }
+    }
+
+    /// Register a new connection with its SSE sender.
+    pub fn insert(&self, id: Uuid, sender: mpsc::Sender<String>) {
+        self.connections.insert(
+            id,
+            ConnectionState {
+                sse_sender: sender,
+                last_signals_json: None,
+            },
+        );
+    }
+
+    /// Get the SSE sender for a connection (for sending server-initiated events).
+    pub fn get_sender(&self, id: &Uuid) -> Option<mpsc::Sender<String>> {
+        self.connections.get(id).map(|c| c.sse_sender.clone())
+    }
+
+    /// Update the stored signals for a connection after a render.
+    pub fn update_signals(&self, id: &Uuid, signals_json: String) {
+        if let Some(mut conn) = self.connections.get_mut(id) {
+            conn.last_signals_json = Some(signals_json);
+        }
+    }
+
+    /// Remove a connection (called on SSE pipe drop).
+    pub fn remove(&self, id: &Uuid) -> Option<(Uuid, ConnectionState)> {
+        self.connections.remove(id)
+    }
+
+    /// Check if a connection exists.
+    pub fn contains(&self, id: &Uuid) -> bool {
+        self.connections.contains_key(id)
+    }
+}
+
+// ---------------------------------------------------------------------------
+// SubscriptionRegistry
+// ---------------------------------------------------------------------------
+
+/// Bidirectional map: CacheKey ↔ ConnectionId.
+///
+/// After each render, the connection's key associations are replaced with
+/// the new set from `cx.subscription_keys`. On connection drop, all entries
+/// for that connection are removed.
+///
+/// Phase 2: on data invalidation event, look up `key_to_conns` to find
+/// which connections need rerender.
+pub struct SubscriptionRegistry {
+    key_to_conns: DashMap<CacheKey, HashSet<Uuid>>,
+    conn_to_keys: DashMap<Uuid, HashSet<CacheKey>>,
+}
+
+impl SubscriptionRegistry {
+    pub fn new() -> Self {
+        Self {
+            key_to_conns: DashMap::new(),
+            conn_to_keys: DashMap::new(),
+        }
+    }
+
+    /// Replace a connection's subscription keys after a render.
+    ///
+    /// Removes old associations and inserts new ones.
+    pub fn update(&self, conn_id: Uuid, new_keys: Vec<CacheKey>) {
+        // Remove old associations
+        if let Some((_, old_keys)) = self.conn_to_keys.remove(&conn_id) {
+            for key in &old_keys {
+                if let Some(mut conns) = self.key_to_conns.get_mut(key) {
+                    conns.remove(&conn_id);
+                }
+            }
+        }
+
+        // Insert new associations
+        let key_set: HashSet<CacheKey> = new_keys.into_iter().collect();
+        for key in &key_set {
+            self.key_to_conns
+                .entry(key.clone())
+                .or_insert_with(HashSet::new)
+                .insert(conn_id);
+        }
+        self.conn_to_keys.insert(conn_id, key_set);
+    }
+
+    /// Remove all entries for a connection (called on SSE pipe drop).
+    pub fn remove_connection(&self, conn_id: &Uuid) {
+        if let Some((_, keys)) = self.conn_to_keys.remove(conn_id) {
+            for key in &keys {
+                if let Some(mut conns) = self.key_to_conns.get_mut(key) {
+                    conns.remove(conn_id);
+                }
+            }
+        }
+    }
+
+    /// Phase 2: look up which connections are subscribed to a given key.
+    #[allow(dead_code)]
+    pub fn get_connections_for_key(&self, key: &CacheKey) -> HashSet<Uuid> {
+        self.key_to_conns
+            .get(key)
+            .map(|c| c.clone())
+            .unwrap_or_default()
+    }
+}
diff --git a/src/framework/context.rs b/src/framework/context.rs
new file mode 100644
index 0000000..f2ff0dc
--- /dev/null
+++ b/src/framework/context.rs
@@ -0,0 +1,200 @@
+use crate::framework::signal::{Signal, SignalOpts, SignalStore};
+use crate::framework::query::{CacheKey, Query};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use uuid::Uuid;
+
+// ---------------------------------------------------------------------------
+// Component tree
+// ---------------------------------------------------------------------------
+
+/// Describes which dynamic components are mounted, parsed from the `tree`
+/// signal.
+///
+/// Static children (always rendered by their parent) do NOT appear here —
+/// only dynamic/conditional slots. In v0 we primarily use `page` to resolve
+/// the root component. The `children` map is the seam for nested dynamic
+/// components in Phase 2.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ComponentTree {
+    /// The root page component name, e.g. `"TodoList"`.
+    pub page: String,
+    /// Dynamic child slots. Key is the slot name, value describes the child.
+    #[serde(default)]
+    pub children: HashMap<String, ComponentNode>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ComponentNode {
+    pub component: String,
+    #[serde(default)]
+    pub key: Option<String>,
+}
+
+impl Default for ComponentTree {
+    fn default() -> Self {
+        Self {
+            page: "TodoList".into(),
+            children: HashMap::new(),
+        }
+    }
+}
+
+// ---------------------------------------------------------------------------
+// RenderContext
+// ---------------------------------------------------------------------------
+
+/// The component's window into the framework.
+///
+/// Passed as `&mut cx` to every component function. Provides access to
+/// signals, database queries, and subscription key collection.
+///
+/// Phase 2 adds: cache handle, auth/session info.
+pub struct RenderContext {
+    /// This connection's UUID.
+    pub connection_id: Uuid,
+
+    /// Signal values populated from the incoming POST body (or initial
+    /// defaults on first page load).
+    pub signals: SignalStore,
+
+    /// Parsed component tree from the `tree` signal.
+    pub tree: ComponentTree,
+
+    /// Database pool. Cloneable (it's an Arc internally).
+    pub db: sqlx::SqlitePool,
+
+    /// Subscription keys accumulated during this render. After render
+    /// completes, these are flushed to the SubscriptionRegistry for this
+    /// connection.
+    pub(crate) subscription_keys: Vec<CacheKey>,
+
+    /// Signal names touched during this render (for demangling tracking).
+    pub(crate) touched_signals: Vec<String>,
+}
+
+impl RenderContext {
+    pub fn new(
+        connection_id: Uuid,
+        signals: SignalStore,
+        tree: ComponentTree,
+        db: sqlx::SqlitePool,
+    ) -> Self {
+        Self {
+            connection_id,
+            signals,
+            tree,
+            db,
+            subscription_keys: Vec::new(),
+            touched_signals: Vec::new(),
+        }
+    }
+
+    // -----------------------------------------------------------------------
+    // Signals
+    // -----------------------------------------------------------------------
+
+    /// Create a signal reference with the given name and scoping options.
+    ///
+    /// Records the signal as "touched" for demangling tracking.
+    ///
+    /// ```ignore
+    /// let open = cx.signal("open", mangle(card.id));
+    /// let val: bool = open.read_or(&cx.signals, false);
+    /// ```
+    pub fn signal(&mut self, name: &str, opts: SignalOpts) -> Signal {
+        let mangled = opts.apply(name);
+        self.touched_signals.push(mangled.clone());
+        Signal::new(mangled)
+    }
+
+    // -----------------------------------------------------------------------
+    // Queries
+    // -----------------------------------------------------------------------
+
+    /// Execute a single query, collecting its subscription key.
+    ///
+    /// ```ignore
+    /// let todos = cx.run(ListTodos).await?;
+    /// ```
+    pub async fn run<Q: Query>(&mut self, query: Q) -> anyhow::Result<Q::Output> {
+        let key = query.cache_key();
+        if key != CacheKey::None {
+            self.subscription_keys.push(key);
+        }
+        query.execute(&self.db).await
+    }
+
+    /// Execute two queries concurrently, collecting both subscription keys.
+    ///
+    /// This avoids the `&mut self` borrow conflict by collecting keys
+    /// synchronously first, then running the async executions against a
+    /// cloned pool handle (pool clones are cheap — they share the inner Arc).
+    ///
+    /// ```ignore
+    /// let (board, columns) = cx.run_all(
+    ///     GetBoard { id: 1 },
+    ///     ListColumns { board_id: 1 },
+    /// ).await?;
+    /// ```
+    pub async fn run_all<A: Query, B: Query>(
+        &mut self,
+        a: A,
+        b: B,
+    ) -> anyhow::Result<(A::Output, B::Output)> {
+        // Collect subscription keys synchronously (no borrow conflict)
+        let key_a = a.cache_key();
+        let key_b = b.cache_key();
+        if key_a != CacheKey::None {
+            self.subscription_keys.push(key_a);
+        }
+        if key_b != CacheKey::None {
+            self.subscription_keys.push(key_b);
+        }
+
+        // Execute concurrently against a cloned pool handle
+        let db = self.db.clone();
+        let (ra, rb) = tokio::try_join!(a.execute(&db), b.execute(&db))?;
+        Ok((ra, rb))
+    }
+
+    /// Three-query variant of `run_all`.
+    pub async fn run_all3<A: Query, B: Query, C: Query>(
+        &mut self,
+        a: A,
+        b: B,
+        c: C,
+    ) -> anyhow::Result<(A::Output, B::Output, C::Output)> {
+        let key_a = a.cache_key();
+        let key_b = b.cache_key();
+        let key_c = c.cache_key();
+        if key_a != CacheKey::None {
+            self.subscription_keys.push(key_a);
+        }
+        if key_b != CacheKey::None {
+            self.subscription_keys.push(key_b);
+        }
+        if key_c != CacheKey::None {
+            self.subscription_keys.push(key_c);
+        }
+
+        let db = self.db.clone();
+        let (ra, rb, rc) = tokio::try_join!(a.execute(&db), b.execute(&db), c.execute(&db))?;
+        Ok((ra, rb, rc))
+    }
+
+    // -----------------------------------------------------------------------
+    // Post-render access
+    // -----------------------------------------------------------------------
+
+    /// Take the subscription keys collected during this render.
+    /// Called by the handler after rendering to flush them to the registry.
+    pub fn take_subscription_keys(&mut self) -> Vec<CacheKey> {
+        std::mem::take(&mut self.subscription_keys)
+    }
+
+    /// Take the touched signal names.
+    pub fn take_touched_signals(&mut self) -> Vec<String> {
+        std::mem::take(&mut self.touched_signals)
+    }
+}
diff --git a/src/framework/mod.rs b/src/framework/mod.rs
new file mode 100644
index 0000000..1e9046c
--- /dev/null
+++ b/src/framework/mod.rs
@@ -0,0 +1,11 @@
+pub mod signal;
+pub mod query;
+pub mod context;
+pub mod connection;
+pub mod sse;
+
+pub use signal::{Signal, SignalStore, SignalOpts, mangle, client_only, global, data_signals};
+pub use query::{CacheKey, Query};
+pub use context::{RenderContext, ComponentTree, ComponentNode};
+pub use connection::{ConnectionManager, ConnectionState, SubscriptionRegistry};
+pub use sse::{format_patch_elements, format_patch_signals};
diff --git a/src/framework/query.rs b/src/framework/query.rs
new file mode 100644
index 0000000..d65d199
--- /dev/null
+++ b/src/framework/query.rs
@@ -0,0 +1,161 @@
+use std::future::Future;
+use std::pin::Pin;
+
+// ---------------------------------------------------------------------------
+// CacheKey
+// ---------------------------------------------------------------------------
+
+/// Identifies what data a query depends on, for subscription tracking.
+///
+/// In v0 these are collected but not acted on. Phase 2 uses them to map
+/// data changes → affected connections → rerender.
+///
+/// Phase 2 adds: `Derived { key: String, value: i64 }` for composite keys
+/// like `"posts:user_id:42"`.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum CacheKey {
+    /// Query has no cacheable identity (rare — side-effect-only reads).
+    None,
+    /// Single row by primary key: `("todos", 42)`.
+    PrimaryKey { table: &'static str, id: i64 },
+    /// future, something like this
+    //ColumnValue { table: &'static str, column: &'static str, val: Box<dyn Any> },
+    /// Entire table: `("todos")`. Used for list queries.
+    Table { table: &'static str },
+}
+
+// ---------------------------------------------------------------------------
+// Query trait
+// ---------------------------------------------------------------------------
+
+/// The central data-access abstraction.
+///
+/// Every read goes through `cx.run(SomeQuery { ... })`, which:
+/// 1. Collects the query's `cache_key` for subscription tracking.
+/// 2. Executes the query against the database.
+///
+/// Phase 2 inserts a cache check between steps 1 and 2.
+///
+/// The trait uses `Pin<Box<dyn Future>>` instead of `async fn` to guarantee
+/// `Send` bounds needed for `tokio::try_join!` in `cx.run_all()`. The
+/// `query_one!` / `query_all!` macros hide this behind a clean declaration.
+pub trait Query: Send + Sync {
+    type Output: Send;
+
+    fn cache_key(&self) -> CacheKey;
+
+    fn execute<'a>(
+        &'a self,
+        db: &'a sqlx::SqlitePool,
+    ) -> Pin<Box<dyn Future<Output = anyhow::Result<Self::Output>> + Send + 'a>>;
+}
+
+// ---------------------------------------------------------------------------
+// query_one! — fetch exactly one row
+// ---------------------------------------------------------------------------
+
+/// Generate a `Query` impl that fetches a single row.
+///
+/// Both `params` and `cache` take closures receiving `&StructName`, so `self`
+/// is always available without hygiene issues.
+///
+/// ```ignore
+/// pub struct GetTodo { pub id: i64 }
+///
+/// query_one!(GetTodo {
+///     sql: "SELECT id, title, completed FROM todos WHERE id = ?",
+///     params: [|s: &GetTodo| s.id],
+///     output: Todo,
+///     cache: |s: &GetTodo| CacheKey::PrimaryKey { table: "todos", id: s.id },
+/// });
+/// ```
+///
+/// The `output` type must implement `sqlx::FromRow<'_, SqliteRow>`.
+#[macro_export]
+macro_rules! query_one {
+    ($name:ident {
+        sql: $sql:expr,
+        params: [$($param:expr),* $(,)?],
+        output: $output:ty,
+        cache: $cache:expr $(,)?
+    }) => {
+        impl $crate::framework::Query for $name {
+            type Output = $output;
+
+            fn cache_key(&self) -> $crate::framework::CacheKey {
+                ($cache)(self)
+            }
+
+            fn execute<'a>(
+                &'a self,
+                db: &'a sqlx::SqlitePool,
+            ) -> ::std::pin::Pin<
+                Box<dyn ::std::future::Future<Output = anyhow::Result<Self::Output>> + Send + 'a>,
+            > {
+                let zelf = self;
+                Box::pin(async move {
+                    let row = sqlx::query_as::<_, $output>($sql)
+                        $(.bind(($param)(zelf)))*
+                        .fetch_one(db)
+                        .await?;
+                    Ok(row)
+                })
+            }
+        }
+    };
+}
+
+// ---------------------------------------------------------------------------
+// query_all! — fetch zero or more rows
+// ---------------------------------------------------------------------------
+
+/// Generate a `Query` impl that fetches multiple rows.
+///
+/// Both `params` and `cache` take closures receiving `&StructName`, so the
+/// style is consistent with `query_one!` even when `s` goes unused.
+///
+/// ```ignore
+/// pub struct ListTodos;
+///
+/// query_all!(ListTodos {
+///     sql: "SELECT id, title, completed FROM todos ORDER BY id",
+///     params: [],
+///     output: Todo,
+///     cache: |_s: &ListTodos| CacheKey::Table { table: "todos" },
+/// });
+/// ```
+///
+/// `Output` is `Vec<output_type>`.
+#[macro_export]
+macro_rules! query_all {
+    ($name:ident {
+        sql: $sql:expr,
+        params: [$($param:expr),* $(,)?],
+        output: $output:ty,
+        cache: $cache:expr $(,)?
+    }) => {
+        impl $crate::framework::Query for $name {
+            type Output = Vec<$output>;
+
+            fn cache_key(&self) -> $crate::framework::CacheKey {
+                ($cache)(self)
+            }
+
+            fn execute<'a>(
+                &'a self,
+                db: &'a sqlx::SqlitePool,
+            ) -> ::std::pin::Pin<
+                Box<dyn ::std::future::Future<Output = anyhow::Result<Self::Output>> + Send + 'a>,
+            > {
+                let zelf = self;
+                Box::pin(async move {
+                    let rows = sqlx::query_as::<_, $output>($sql)
+                        $(.bind(($param)(zelf)))*
+                        .fetch_all(db)
+                        .await?;
+                    Ok(rows)
+                })
+            }
+        }
+    };
+}
\ No newline at end of file
diff --git a/src/framework/signal.rs b/src/framework/signal.rs
new file mode 100644
index 0000000..0aeea01
--- /dev/null
+++ b/src/framework/signal.rs
@@ -0,0 +1,296 @@
+use serde::de::DeserializeOwned;
+use std::collections::HashMap;
+use std::fmt::Display;
+
+// ---------------------------------------------------------------------------
+// Signal scoping
+// ---------------------------------------------------------------------------
+
+/// Controls how a signal name is constructed.
+///
+/// Every signal must choose a scope (per-instance via `mangle(key)` or
+/// page-global via `global()`) and a visibility (server-relevant or
+/// client-only via `.client_only()`). There is no default — forcing the
+/// developer to think about "is this mine or the page's?" on every signal.
+#[derive(Debug, Clone)]
+pub struct SignalOpts {
+    pub scope: SignalScope,
+    pub visibility: SignalVisibility,
+}
+
+#[derive(Debug, Clone)]
+pub enum SignalScope {
+    /// Per-instance signal. The key is appended as `__<key>`.
+    Mangled(String),
+    /// Page-global signal. No suffix.
+    Global,
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum SignalVisibility {
+    /// Sent to server on every @post (no prefix).
+    ServerRelevant,
+    /// Never sent to server (`_` prefix).
+    ClientOnly,
+}
+
+/// Per-instance, server-relevant signal (most common).
+///
+/// ```ignore
+/// cx.signal("open", mangle(card.id))  // → "open__42"
+/// ```
+pub fn mangle(key: impl Display) -> SignalOpts {
+    SignalOpts {
+        scope: SignalScope::Mangled(key.to_string()),
+        visibility: SignalVisibility::ServerRelevant,
+    }
+}
+
+/// Page-global, client-only signal.
+///
+/// ```ignore
+/// cx.signal("draggingCardId", client_only())  // → "_draggingCardId"
+/// ```
+pub fn client_only() -> SignalOpts {
+    SignalOpts {
+        scope: SignalScope::Global,
+        visibility: SignalVisibility::ClientOnly,
+    }
+}
+
+/// Page-global, server-relevant signal.
+///
+/// ```ignore
+/// cx.signal("activeTab", global())  // → "activeTab"
+/// ```
+pub fn global() -> SignalOpts {
+    SignalOpts {
+        scope: SignalScope::Global,
+        visibility: SignalVisibility::ServerRelevant,
+    }
+}
+
+impl SignalOpts {
+    /// Chain `.client_only()` to make any signal client-only.
+    ///
+    /// ```ignore
+    /// cx.signal("hovered", mangle(card.id).client_only())  // → "_hovered__42"
+    /// ```
+    pub fn client_only(mut self) -> Self {
+        self.visibility = SignalVisibility::ClientOnly;
+        self
+    }
+
+    /// Compute the final signal name from a base name + these options.
+    pub fn apply(&self, base: &str) -> String {
+        let prefix = match self.visibility {
+            SignalVisibility::ClientOnly => "_",
+            SignalVisibility::ServerRelevant => "",
+        };
+        let suffix = match &self.scope {
+            SignalScope::Mangled(key) => format!("__{}", key),
+            SignalScope::Global => String::new(),
+        };
+        format!("{}{}{}", prefix, base, suffix)
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Signal
+// ---------------------------------------------------------------------------
+
+/// A resolved signal reference. Produced by `cx.signal()`.
+///
+/// Use `name` in `data-bind` attributes and `val` in expressions.
+#[derive(Debug, Clone)]
+pub struct Signal {
+    /// Raw name, e.g. `"open__42"` or `"_draggingCardId"`.
+    /// Use for `data-bind-{name}`.
+    pub name: String,
+    /// `$`-prefixed name for DataStar expressions, e.g. `"$open__42"`.
+    pub val: String,
+}
+
+impl Signal {
+    pub fn new(name: String) -> Self {
+        let val = format!("${}", name);
+        Self { name, val }
+    }
+
+    /// Produce a key-value entry for a `data-signals` attribute.
+    ///
+    /// Returns `"name: default"`. Wrap in `data_signals(&[...])` to build
+    /// the full attribute value.
+    ///
+    /// The `default` should be a JS literal: `"false"`, `"0"`, `"'hello'"`.
+    pub fn declare(&self, default: impl Display) -> String {
+        format!("{}: {}", self.name, default)
+    }
+
+    /// Produce a set expression for `data-on-*` attributes.
+    ///
+    /// Returns `"$name = value"`.
+    pub fn set(&self, value: impl Display) -> String {
+        format!("{} = {}", self.val, value)
+    }
+
+    /// Read this signal's current value from the store, or return `default`.
+    pub fn read_or<T: DeserializeOwned>(&self, store: &SignalStore, default: T) -> T {
+        store
+            .get(&self.name)
+            .and_then(|v| serde_json::from_value(v.clone()).ok())
+            .unwrap_or(default)
+    }
+}
+
+// ---------------------------------------------------------------------------
+// SignalStore
+// ---------------------------------------------------------------------------
+
+/// Holds the signal values received from the client in a POST body.
+///
+/// Keyed by the full (mangled) signal name. Values are JSON.
+#[derive(Debug, Clone, Default)]
+pub struct SignalStore {
+    values: HashMap<String, serde_json::Value>,
+}
+
+impl SignalStore {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Build a store from a JSON object (the POST body from DataStar).
+    pub fn from_json(json: serde_json::Value) -> Self {
+        let values = match json {
+            serde_json::Value::Object(map) => {
+                map.into_iter().collect()
+            }
+            _ => HashMap::new(),
+        };
+        Self { values }
+    }
+
+    /// Build a store from an initial set of key-value pairs.
+    pub fn from_pairs(pairs: Vec<(String, serde_json::Value)>) -> Self {
+        Self {
+            values: pairs.into_iter().collect(),
+        }
+    }
+
+    pub fn get(&self, key: &str) -> Option<&serde_json::Value> {
+        self.values.get(key)
+    }
+
+    pub fn insert(&mut self, key: String, value: serde_json::Value) {
+        self.values.insert(key, value);
+    }
+
+    /// Serialize all server-relevant signals (no `_` prefix) to a JSON string.
+    /// Used for `last_signals_json` storage.
+    pub fn to_json_string(&self) -> String {
+        let obj: serde_json::Map<String, serde_json::Value> = self
+            .values
+            .iter()
+            .filter(|(k, _)| !k.starts_with('_'))
+            .map(|(k, v)| (k.clone(), v.clone()))
+            .collect();
+        serde_json::Value::Object(obj).to_string()
+    }
+
+    /// Format all signals as a JS object literal for `data-signals` attribute.
+    /// Uses JSON format which is valid JS.
+    pub fn to_data_signals_attr(&self) -> String {
+        self.to_json_string()
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+/// Build a `data-signals` attribute value from a list of `signal.declare()`
+/// entries.
+///
+/// ```ignore
+/// data_signals(&[open.declare("false"), count.declare("0")])
+/// // → "{open__42: false, count__42: 0}"
+/// ```
+pub fn data_signals(entries: &[String]) -> String {
+    format!("{{{}}}", entries.join(", "))
+}
+
+// ---------------------------------------------------------------------------
+// Demangling
+// ---------------------------------------------------------------------------
+
+/// Demangle a signal name back to `(base_name, Option<instance_key>)`.
+///
+/// `"open__42"` → `("open", Some("42"))`
+/// `"_hovered__42"` → `("hovered", Some("42"))` (prefix stripped)
+/// `"activeTab"` → `("activeTab", None)`
+pub fn demangle(mangled: &str) -> (&str, Option<&str>) {
+    // Strip client-only prefix for demangling purposes
+    let stripped = mangled.strip_prefix('_').unwrap_or(mangled);
+    match stripped.split_once("__") {
+        Some((base, key)) => (base, Some(key)),
+        None => (stripped, None),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_mangle_server_relevant() {
+        let opts = mangle(42);
+        assert_eq!(opts.apply("open"), "open__42");
+    }
+
+    #[test]
+    fn test_mangle_client_only() {
+        let opts = mangle(42).client_only();
+        assert_eq!(opts.apply("hovered"), "_hovered__42");
+    }
+
+    #[test]
+    fn test_global_client_only() {
+        let opts = client_only();
+        assert_eq!(opts.apply("draggingCardId"), "_draggingCardId");
+    }
+
+    #[test]
+    fn test_global_server_relevant() {
+        let opts = global();
+        assert_eq!(opts.apply("activeTab"), "activeTab");
+    }
+
+    #[test]
+    fn test_demangle() {
+        assert_eq!(demangle("open__42"), ("open", Some("42")));
+        assert_eq!(demangle("_hovered__42"), ("hovered", Some("42")));
+        assert_eq!(demangle("activeTab"), ("activeTab", None));
+    }
+
+    #[test]
+    fn test_signal_declare() {
+        let sig = Signal::new("open__42".into());
+        assert_eq!(sig.declare("false"), "open__42: false");
+    }
+
+    #[test]
+    fn test_signal_set() {
+        let sig = Signal::new("open__42".into());
+        assert_eq!(sig.set("true"), "$open__42 = true");
+    }
+
+    #[test]
+    fn test_data_signals_helper() {
+        let result = data_signals(&[
+            "open__42: false".into(),
+            "count: 0".into(),
+        ]);
+        assert_eq!(result, "{open__42: false, count: 0}");
+    }
+}
diff --git a/src/framework/sse.rs b/src/framework/sse.rs
new file mode 100644
index 0000000..5725708
--- /dev/null
+++ b/src/framework/sse.rs
@@ -0,0 +1,79 @@
+/// SSE event formatting for DataStar v1.
+///
+/// DataStar v1 SSE event names (verified against https://data-star.dev/reference/sse_events):
+///
+/// - `datastar-patch-elements` — morph HTML into the DOM by element ID
+///   Each line of HTML is prefixed with `data: elements `
+///
+/// - `datastar-patch-signals` — update client-side signals
+///   Signals are a JS object literal: `data: signals {key: value}`
+///
+/// SSE events are terminated by a blank line (`\n\n`).
+
+/// Format a `datastar-patch-elements` SSE event.
+///
+/// The `html` should contain a top-level element with an `id` attribute
+/// (e.g. `<div id="app">...</div>`). DataStar will morph it into the
+/// existing element with that ID.
+///
+/// Multi-line HTML is split and each line gets the `data: elements ` prefix,
+/// per the SSE protocol (multiple `data:` lines are concatenated with `\n`
+/// by the SSE parser; DataStar then strips the `elements ` prefix from each).
+pub fn format_patch_elements(html: &str) -> String {
+    let mut event = String::from("event: datastar-patch-elements\n");
+    for line in html.lines() {
+        event.push_str("data: elements ");
+        event.push_str(line);
+        event.push('\n');
+    }
+    event.push('\n'); // blank line terminates SSE event
+    event
+}
+
+/// Format a `datastar-patch-signals` SSE event.
+///
+/// `signals_js` should be a JS object literal string, e.g. `{foo: '', bar: 0}`.
+/// Note: this is JS syntax (unquoted keys OK), not strict JSON.
+pub fn format_patch_signals(signals_js: &str) -> String {
+    format!(
+        "event: datastar-patch-signals\ndata: signals {}\n\n",
+        signals_js
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_patch_elements_single_line() {
+        let result = format_patch_elements(r#"<div id="app">hello</div>"#);
+        assert_eq!(
+            result,
+            "event: datastar-patch-elements\ndata: elements <div id=\"app\">hello</div>\n\n"
+        );
+    }
+
+    #[test]
+    fn test_patch_elements_multi_line() {
+        let html = "<div id=\"app\">\n  <h1>Hello</h1>\n</div>";
+        let result = format_patch_elements(html);
+        let expected = concat!(
+            "event: datastar-patch-elements\n",
+            "data: elements <div id=\"app\">\n",
+            "data: elements   <h1>Hello</h1>\n",
+            "data: elements </div>\n",
+            "\n",
+        );
+        assert_eq!(result, expected);
+    }
+
+    #[test]
+    fn test_patch_signals() {
+        let result = format_patch_signals("{newTodo: ''}");
+        assert_eq!(
+            result,
+            "event: datastar-patch-signals\ndata: signals {newTodo: ''}\n\n"
+        );
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d6b47a7
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,63 @@
+mod framework;
+mod app;
+
+use app::AppState;
+use framework::connection::{ConnectionManager, SubscriptionRegistry};
+use std::sync::Arc;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    // -----------------------------------------------------------------------
+    // Database setup
+    // -----------------------------------------------------------------------
+
+    // SQLite with create-if-missing. In-memory `:memory:` also works for dev.
+    let db = sqlx::SqlitePool::connect("sqlite:livevue.db?mode=rwc").await?;
+
+    // Run migrations inline (no migration files needed for v0).
+    sqlx::query(
+        "CREATE TABLE IF NOT EXISTS todos (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            title TEXT NOT NULL,
+            completed BOOLEAN NOT NULL DEFAULT FALSE
+        )",
+    )
+    .execute(&db)
+    .await?;
+
+    // Seed a few todos if the table is empty (nice for first run)
+    let count: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM todos")
+        .fetch_one(&db)
+        .await?;
+    if count.0 == 0 {
+        for title in &["Learn Rust", "Build LiveVue.rs", "Ship v0"] {
+            sqlx::query("INSERT INTO todos (title, completed) VALUES (?, false)")
+                .bind(title)
+                .execute(&db)
+                .await?;
+        }
+    }
+
+    // -----------------------------------------------------------------------
+    // Application state
+    // -----------------------------------------------------------------------
+
+    let state = Arc::new(AppState {
+        db,
+        connections: ConnectionManager::new(),
+        subscriptions: SubscriptionRegistry::new(),
+    });
+
+    // -----------------------------------------------------------------------
+    // Server
+    // -----------------------------------------------------------------------
+
+    let app = app::router(state);
+
+    let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await?;
+    println!("LiveVue.rs v0.1 listening on http://localhost:3000");
+
+    axum::serve(listener, app).await?;
+
+    Ok(())
+}