wip stuff (idk)

.gitignore

@@ -12,3 +12,9 @@ ndk/
 .DS_Store
 custom_songs/
 custom_cards/
+/custom_3dmv/
+
+# local-only trees — never commit (35GB between them)
+/android/
+/assets.bak/
+/assets.old/

Cargo.lock

@@ -223,6 +223,22 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "actix-ws"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "decf53c3cdd63dd6f289980b430238f9a2f6d19f8bce8e418272e08d3da43f0f"
+dependencies = [
+ "actix-codec",
+ "actix-http",
+ "actix-web",
+ "bytestring",
+ "futures-core",
+ "futures-sink",
+ "tokio",
+ "tokio-util",
+]
+
 [[package]]
 name = "adler2"
 version = "2.0.1"
@@ -1073,6 +1089,7 @@ version = "1.1.0"
 dependencies = [
  "actix-multipart",
  "actix-web",
+ "actix-ws",
  "aes",
  "argon2",
  "base64",
@@ -1103,6 +1120,7 @@ dependencies = [
  "sha1",
  "sha2",
  "symphonia",
+ "tokio",
  "ureq",
  "urlencoding",
  "uuid",
@@ -3209,6 +3227,7 @@ dependencies = [
  "bytes",
  "futures-core",
  "futures-sink",
+ "futures-util",
  "pin-project-lite",
  "tokio",
 ]

Cargo.toml

@@ -32,6 +32,10 @@ include_dir = "0.7.4"
 jzon = "0.12.5"
 csv = "1.3"
 actix-multipart = "0.8"
+# Multi-live relay: WebSockets over actix-web 4 without the actor runtime
+actix-ws = "0.4"
+# tokio is already in the tree under actix-rt; only the mpsc channels are used
+tokio = { version = "1", features = ["sync"] }
 futures-util = "0.3"
 image = "0.25"
 zip = { version = "8.6", default-features = false, features = ["deflate"] }

docker/docker-compose.yml

@@ -15,6 +15,7 @@ services:
       DISABLE_EXPORTS: false # Will disable account exports
       #ENABLE_CUSTOM_SONGS: true # Custom songs are DISABLED by default; uncomment to enable upload/browse/download (webui + endpoints)
       #ENABLE_CUSTOM_CARDS: true # Custom cards are DISABLED by default; uncomment to enable runtime card/character uploads (webui + endpoints)
+      #ENABLE_CUSTOM_3DMV: true # Custom 3D MVs are DISABLED by default; uncomment to enable MMD model+motion MV uploads for custom songs (webui + endpoints)
       #OWNER: "123456789012345" # 15-digit game user id(s) (comma-separated) that hold every permission scope; without an owner nobody can grant scopes or upload cards
       #PURGE: false # Purge dead user accounts on startup
       #IMAGE_ASSET_PATH: /images/ # Images for cards in webui (will default to the public server)

docker/start.sh

@@ -15,6 +15,8 @@ args=(
 [ "${DISABLE_EXPORTS:-}" = "true" ] && args+=(--disable-exports)
 [ "${ENABLE_CUSTOM_SONGS:-}" = "true" ] && args+=(--enable-custom-songs)
 [ "${ENABLE_CUSTOM_CARDS:-}" = "true" ] && args+=(--enable-custom-cards)
+[ "${ENABLE_CUSTOM_3DMV:-}" = "true" ] && args+=(--enable-custom-3dmv)
+[ "${ENABLE_ARCADE:-}" = "true" ]    && args+=(--enable-arcade)
 
 add_opt() {
   local value="$1" flag="$2"
@@ -34,6 +36,12 @@ add_opt "${WINDOWS_ASSET_HASH:-}"    --windows-asset-hash
 # Server owner uid(s) for the permission system (comma-separated)
 add_opt "${OWNER:-}" --owner
 
+# Days an unseen arcade machine survives --purge
+add_opt "${ARCADE_MACHINE_TTL:-}" --arcade-machine-ttl
+
+# Minutes a card's credit buys LP-free play for after /api/arcade/session
+add_opt "${ARCADE_SESSION_TTL:-}" --arcade-session-ttl
+
 # Asset / image paths.
 add_opt "${IMAGE_ASSET_PATH:-}" --image-asset-path
 add_opt "${MASTERDATA:-}"       --masterdata

src/database.rs

@@ -1,4 +1,7 @@
 pub mod gree;
 pub mod custom_song;
 pub mod custom_card;
+pub mod custom_3dmv;
 pub mod permissions;
+pub mod announcements;
+pub mod arcade;

src/database/announcements.rs

@@ -0,0 +1,267 @@
+use lazy_static::lazy_static;
+use rusqlite::params;
+use jzon::{array, object, JsonValue};
+
+use crate::router::global;
+use crate::sql::SQLite;
+
+lazy_static! {
+    static ref DATABASE: SQLite = SQLite::new("announcements.db", setup_tables);
+}
+
+// 1 = notice, 2 = update, 3 = bug
+pub const CATEGORIES: &[i64] = &[1, 2, 3];
+
+pub const TYPES: &[&str] = &["news", "event", "gacha", "maintenance", "shop", "others"];
+
+pub fn is_valid_category(category: i64) -> bool {
+    CATEGORIES.contains(&category)
+}
+
+pub fn is_valid_type(kind: &str) -> bool {
+    TYPES.contains(&kind)
+}
+
+fn setup_tables(conn: &rusqlite::Connection) {
+    conn.execute_batch("
+CREATE TABLE IF NOT EXISTS announcements (
+    id            INTEGER PRIMARY KEY AUTOINCREMENT,
+    category      INTEGER NOT NULL,
+    type          TEXT NOT NULL,
+    title         TEXT NOT NULL,
+    body          TEXT NOT NULL,
+    banner        BLOB,
+    updated       INTEGER NOT NULL DEFAULT 0,
+    visible       INTEGER NOT NULL DEFAULT 1,
+    published_at  BIGINT NOT NULL,
+    created_by    BIGINT NOT NULL,
+    created_at    BIGINT NOT NULL
+);
+    ").unwrap();
+}
+
+pub enum Banner {
+    Keep,
+    Clear,
+    Set(Vec<u8>)
+}
+
+fn row_to_json(row: &rusqlite::Row) -> rusqlite::Result<JsonValue> {
+    Ok(object!{
+        id: row.get::<usize, i64>(0)?,
+        category: row.get::<usize, i64>(1)?,
+        type: row.get::<usize, String>(2)?,
+        title: row.get::<usize, String>(3)?,
+        body: row.get::<usize, String>(4)?,
+        has_banner: row.get::<usize, i64>(5)? != 0,
+        updated: row.get::<usize, i64>(6)? != 0,
+        visible: row.get::<usize, i64>(7)? != 0,
+        published_at: row.get::<usize, i64>(8)?,
+        created_by: row.get::<usize, i64>(9)?,
+        created_at: row.get::<usize, i64>(10)?
+    })
+}
+
+const COLUMNS: &str = "id, category, type, title, body, banner IS NOT NULL, updated, visible, published_at, created_by, created_at";
+
+fn query(where_clause: &str, args: &[&dyn rusqlite::ToSql]) -> JsonValue {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).unwrap();
+    let sql = format!("SELECT {COLUMNS} FROM announcements {where_clause} ORDER BY published_at DESC, id DESC");
+    let Ok(mut stmt) = conn.prepare(&sql) else {
+        return array![];
+    };
+    let Ok(mapped) = stmt.query_map(args, |row| row_to_json(row)) else {
+        return array![];
+    };
+    let mut rv = array![];
+    for row in mapped.flatten() {
+        rv.push(row).unwrap();
+    }
+    rv
+}
+
+pub fn list_category(category: i64) -> JsonValue {
+    query("WHERE visible=1 AND category=?1", params!(category))
+}
+
+pub fn get_all() -> JsonValue {
+    query("", params!())
+}
+
+pub fn get(id: i64) -> Option<JsonValue> {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).unwrap();
+    let sql = format!("SELECT {COLUMNS} FROM announcements WHERE id=?1");
+    conn.query_row(&sql, params!(id), |row| row_to_json(row)).ok()
+}
+
+pub fn get_banner(id: i64) -> Option<Vec<u8>> {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).unwrap();
+    conn.query_row("SELECT banner FROM announcements WHERE id=?1 AND banner IS NOT NULL", params!(id), |row| row.get::<usize, Vec<u8>>(0)).ok()
+}
+
+pub fn get_public_banner(id: i64) -> Option<Vec<u8>> {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).unwrap();
+    conn.query_row("SELECT banner FROM announcements WHERE id=?1 AND visible=1 AND banner IS NOT NULL", params!(id), |row| row.get::<usize, Vec<u8>>(0)).ok()
+}
+
+pub fn visible_ids(category: Option<i64>) -> Vec<i64> {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).unwrap();
+    let (sql, args): (&str, Vec<&dyn rusqlite::ToSql>) = match &category {
+        Some(c) => ("SELECT id FROM announcements WHERE visible=1 AND category=?1", vec![c]),
+        None => ("SELECT id FROM announcements WHERE visible=1", vec![])
+    };
+    let Ok(mut stmt) = conn.prepare(sql) else {
+        return Vec::new();
+    };
+    let Ok(mapped) = stmt.query_map(args.as_slice(), |row| row.get::<usize, i64>(0)) else {
+        return Vec::new();
+    };
+    mapped.flatten().collect()
+}
+
+pub fn latest_published_at() -> i64 {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).unwrap();
+    conn.query_row("SELECT MAX(published_at) FROM announcements WHERE visible=1", params!(), |row| row.get::<usize, i64>(0)).unwrap_or(0)
+}
+
+pub fn create(category: i64, kind: &str, title: &str, body: &str, banner: Option<Vec<u8>>, updated: bool, visible: bool, published_at: i64, created_by: i64) -> i64 {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).unwrap();
+    conn.execute(
+        "INSERT INTO announcements (category, type, title, body, banner, updated, visible, published_at, created_by, created_at) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10)",
+        params!(category, kind, title, body, banner, updated as i64, visible as i64, published_at, created_by, global::timestamp() as i64)
+    ).unwrap();
+    conn.last_insert_rowid()
+}
+
+pub fn update(id: i64, category: i64, kind: &str, title: &str, body: &str, banner: Banner, updated: bool, visible: bool, published_at: i64) {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).unwrap();
+    conn.execute(
+        "UPDATE announcements SET category=?2, type=?3, title=?4, body=?5, updated=?6, visible=?7, published_at=?8 WHERE id=?1",
+        params!(id, category, kind, title, body, updated as i64, visible as i64, published_at)
+    ).unwrap();
+    match banner {
+        Banner::Keep => {},
+        Banner::Clear => { conn.execute("UPDATE announcements SET banner=NULL WHERE id=?1", params!(id)).unwrap(); },
+        Banner::Set(bytes) => { conn.execute("UPDATE announcements SET banner=?2 WHERE id=?1", params!(id, bytes)).unwrap(); }
+    }
+}
+
+pub fn delete(id: i64) {
+    DATABASE.lock_and_exec("DELETE FROM announcements WHERE id=?1", params!(id));
+}
+
+
+
+
+/// more tests??? This is probably a good thing but man haha
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn wipe() {
+        DATABASE.lock_and_exec("DELETE FROM announcements", params!());
+    }
+
+    #[test]
+    fn create_list_and_category_filter() {
+        let _lock = crate::runtime::lock_test_data_path();
+        wipe();
+
+        let a = create(1, "news", "First", "<p>body</p>", None, false, true, 1000, 42);
+        let b = create(1, "event", "Second", "body", Some(vec![1, 2, 3]), true, true, 2000, 42);
+        let c = create(2, "gacha", "Other tab", "body", None, false, true, 1500, 42);
+        let hidden = create(1, "news", "Draft", "body", None, false, false, 3000, 42);
+
+        // One tab, visible only, newest first
+        let cat1 = list_category(1);
+        assert_eq!(cat1.len(), 2);
+        assert_eq!(cat1[0]["id"].as_i64(), Some(b));
+        assert_eq!(cat1[1]["id"].as_i64(), Some(a));
+        assert!(cat1.members().all(|row| row["id"].as_i64() != Some(hidden)));
+
+        // has_banner reflects the blob without carrying it
+        assert_eq!(cat1[0]["has_banner"].as_bool(), Some(true));
+        assert_eq!(cat1[1]["has_banner"].as_bool(), Some(false));
+        assert_eq!(get_banner(b), Some(vec![1, 2, 3]));
+        assert_eq!(get_banner(a), None);
+
+        // The other tab is untouched, the admin view sees the draft too
+        assert_eq!(list_category(2).len(), 1);
+        assert_eq!(list_category(2)[0]["id"].as_i64(), Some(c));
+        assert_eq!(get_all().len(), 4);
+
+        assert_eq!(latest_published_at(), 2000);
+        let mut visible = visible_ids(None);
+        visible.sort();
+        assert_eq!(visible, vec![a, b, c]);
+        let mut cat1_ids = visible_ids(Some(1));
+        cat1_ids.sort();
+        assert_eq!(cat1_ids, vec![a, b]);
+
+        wipe();
+    }
+
+    #[test]
+    fn update_rewrites_and_banner_transitions() {
+        let _lock = crate::runtime::lock_test_data_path();
+        wipe();
+
+        let id = create(1, "news", "Title", "body", Some(vec![9]), false, true, 1000, 7);
+        update(id, 3, "maintenance", "New title", "new body", Banner::Keep, true, true, 5000);
+        let row = get(id).unwrap();
+        assert_eq!(row["category"].as_i64(), Some(3));
+        assert_eq!(row["type"].as_str(), Some("maintenance"));
+        assert_eq!(row["title"].as_str(), Some("New title"));
+        assert_eq!(row["updated"].as_bool(), Some(true));
+        assert_eq!(row["published_at"].as_i64(), Some(5000));
+        // Keep left the blob in place
+        assert_eq!(get_banner(id), Some(vec![9]));
+
+        update(id, 3, "maintenance", "New title", "new body", Banner::Set(vec![4, 5]), true, true, 5000);
+        assert_eq!(get_banner(id), Some(vec![4, 5]));
+        update(id, 3, "maintenance", "New title", "new body", Banner::Clear, true, false, 5000);
+        assert_eq!(get_banner(id), None);
+        assert_eq!(get(id).unwrap()["visible"].as_bool(), Some(false));
+
+        delete(id);
+        assert!(get(id).is_none());
+        wipe();
+    }
+
+    // Ids are sequential, so the player-facing banner route is pollable: a
+    // draft's banner must be reachable by the admin lookup and by nothing else
+    #[test]
+    fn a_drafts_banner_is_admin_only() {
+        let _lock = crate::runtime::lock_test_data_path();
+        wipe();
+
+        let published = create(1, "news", "Live", "body", Some(vec![1, 2]), false, true, 1000, 42);
+        let draft = create(1, "news", "Unannounced", "body", Some(vec![7, 7]), false, false, 2000, 42);
+
+        assert_eq!(get_banner(draft), Some(vec![7, 7]));
+        assert_eq!(get_public_banner(draft), None);
+        assert_eq!(get_public_banner(published), Some(vec![1, 2]));
+
+        // Publishing it makes the banner reachable, hiding it again takes it back
+        update(draft, 1, "news", "Unannounced", "body", Banner::Keep, false, true, 2000);
+        assert_eq!(get_public_banner(draft), Some(vec![7, 7]));
+        update(draft, 1, "news", "Unannounced", "body", Banner::Keep, false, false, 2000);
+        assert_eq!(get_public_banner(draft), None);
+
+        wipe();
+    }
+
+    #[test]
+    fn vocabulary_is_wellformed() {
+        for category in CATEGORIES {
+            assert!(is_valid_category(*category));
+        }
+        assert!(!is_valid_category(0));
+        assert!(!is_valid_category(4));
+        for kind in TYPES {
+            assert!(is_valid_type(kind));
+        }
+        assert!(!is_valid_type("explosion"));
+    }
+}

src/database/arcade.rs

@@ -0,0 +1,474 @@
+use lazy_static::lazy_static;
+use rusqlite::params;
+use jzon::{array, object, JsonValue};
+use rand::RngExt;
+
+use crate::router::global;
+use crate::sql::SQLite;
+
+lazy_static! {
+    static ref DATABASE: SQLite = SQLite::new("arcade.db", setup_tables);
+}
+
+// A cabinet owns exactly two accounts forever: the MACHINE account (the identity
+// the attract loop and its demo lives run on) and one reusable GUEST account,
+// rewritten from scratch at every credit. Neither is ever handed out twice and
+// neither accumulates, so the arcade never leaves dead users behind.
+//
+// `cards` maps a physical card id to the account it plays as. `last_machine_id`
+// / `last_session` are the "which cabinet is this card sitting at" record: a
+// card account is not owned by any one machine, so /live/end attributes its play
+// to the machine that most recently ran a session for that card. Keeping it as
+// two columns on the row the session already writes is the whole design - no
+// second table, no row to expire, and the attribution can never outlive the
+// mapping it belongs to.
+//
+// `session_until` is the same row's other half and the one that costs money: the
+// moment the credit that /api/arcade/session took stops buying LP-free lives.
+// Before it, a card account plays as a cabinet does; after it, the same account
+// is an ordinary phone account again. It is a stamp rather than a flag so that a
+// cabinet that loses power mid-credit expires on its own with nothing to clean
+// up, and so an operator can size the window with --arcade-session-ttl.
+//
+// `plays` is the bookkeeping ledger: one row per arcade song, cleared or not.
+// `cleared` is 0 for a song whose life gauge emptied: the client plays it out and
+// reports it at /live/retire rather than /live/end (there is no cleared flag on
+// the end wire and live_end_ex records a clear unconditionally), so the retire is
+// the only place the ledger can learn about a failed song. A credit's play is two
+// songs whether they were passed or not, which is what makes the total the number
+// an operator's bookkeeping counts.
+fn setup_tables(conn: &rusqlite::Connection) {
+    conn.execute_batch("
+CREATE TABLE IF NOT EXISTS machines (
+    machine_id       TEXT NOT NULL PRIMARY KEY,
+    name             TEXT NOT NULL,
+    machine_user_id  BIGINT NOT NULL,
+    guest_user_id    BIGINT NOT NULL,
+    created          BIGINT NOT NULL,
+    last_seen        BIGINT NOT NULL
+);
+CREATE TABLE IF NOT EXISTS cards (
+    card_id          TEXT NOT NULL PRIMARY KEY,
+    user_id          BIGINT NOT NULL,
+    created          BIGINT NOT NULL,
+    last_machine_id  TEXT NOT NULL DEFAULT '',
+    last_session     BIGINT NOT NULL DEFAULT 0,
+    session_until    BIGINT NOT NULL DEFAULT 0
+);
+CREATE TABLE IF NOT EXISTS plays (
+    id          INTEGER PRIMARY KEY,
+    machine_id  TEXT NOT NULL,
+    user_id     BIGINT NOT NULL,
+    live_id     BIGINT NOT NULL,
+    level       INT NOT NULL,
+    score       BIGINT NOT NULL,
+    rank        INT NOT NULL,
+    at          BIGINT NOT NULL,
+    cleared     INTEGER NOT NULL DEFAULT 1
+);
+CREATE INDEX IF NOT EXISTS plays_machine ON plays (machine_id);
+    ").unwrap();
+    // Upgrade databases written before the card session record existed. Existing
+    // mappings simply have no cabinet attached until their next session.
+    if conn.prepare("SELECT last_machine_id FROM cards LIMIT 1;").is_err() {
+        println!("Upgrading arcade card table");
+        conn.execute("ALTER TABLE cards ADD COLUMN last_machine_id TEXT NOT NULL DEFAULT '';", []).unwrap();
+        conn.execute("ALTER TABLE cards ADD COLUMN last_session BIGINT NOT NULL DEFAULT 0;", []).unwrap();
+    }
+    // Upgrade databases written before the LP-free window existed. 0 is "this
+    // card is not at a cabinet", so every existing mapping starts closed and
+    // opens at its next session - the safe direction.
+    if conn.prepare("SELECT session_until FROM cards LIMIT 1;").is_err() {
+        println!("Upgrading arcade card table (session window)");
+        conn.execute("ALTER TABLE cards ADD COLUMN session_until BIGINT NOT NULL DEFAULT 0;", []).unwrap();
+    }
+    // Upgrade databases written before failed songs were recorded at all. Every
+    // row already in the ledger got there through /live/end, which is a clear.
+    if conn.prepare("SELECT cleared FROM plays LIMIT 1;").is_err() {
+        println!("Upgrading arcade play table (cleared)");
+        conn.execute("ALTER TABLE plays ADD COLUMN cleared INTEGER NOT NULL DEFAULT 1;", []).unwrap();
+    }
+}
+
+// 16 hex characters, the shape the client stores in ArcadeSaveData.Machine and
+// presents on every later call. It is the only thing that authenticates a
+// cabinet, so it is drawn at full width rather than derived from anything
+// guessable, and re-drawn on the (never observed) collision
+pub fn generate_machine_id() -> String {
+    const CHARSET: &[u8] = b"0123456789abcdef";
+    let mut rng = rand::rng();
+    let id: String = (0..16)
+        .map(|_| CHARSET[rng.random_range(0..CHARSET.len())] as char)
+        .collect();
+    if machine_exists(&id) {
+        return generate_machine_id();
+    }
+    id
+}
+
+pub fn machine_exists(machine_id: &str) -> bool {
+    DATABASE.lock_and_select("SELECT machine_id FROM machines WHERE machine_id=?1", params!(machine_id)).is_ok()
+}
+
+pub fn insert_machine(machine_id: &str, name: &str, machine_user_id: i64, guest_user_id: i64) {
+    let now = global::timestamp() as i64;
+    DATABASE.lock_and_exec(
+        "INSERT INTO machines (machine_id, name, machine_user_id, guest_user_id, created, last_seen) VALUES (?1, ?2, ?3, ?4, ?5, ?5)",
+        params!(machine_id, name, machine_user_id, guest_user_id, now)
+    );
+}
+
+fn machine_row(conn: &rusqlite::Connection, machine_id: &str) -> Option<JsonValue> {
+    let mut stmt = conn.prepare("SELECT machine_id, name, machine_user_id, guest_user_id, created, last_seen FROM machines WHERE machine_id=?1").ok()?;
+    stmt.query_row(params!(machine_id), |row| {
+        Ok(object!{
+            machine_id: row.get::<usize, String>(0)?,
+            name: row.get::<usize, String>(1)?,
+            machine_user_id: row.get::<usize, i64>(2)?,
+            guest_user_id: row.get::<usize, i64>(3)?,
+            created: row.get::<usize, i64>(4)?,
+            last_seen: row.get::<usize, i64>(5)?
+        })
+    }).ok()
+}
+
+pub fn get_machine(machine_id: &str) -> Option<JsonValue> {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).ok()?;
+    machine_row(&conn, machine_id)
+}
+
+// The cabinet is alive: every session (and every play it records) stamps it, and
+// the purge sweeper measures a machine's age from here
+pub fn touch_machine(machine_id: &str) {
+    DATABASE.lock_and_exec("UPDATE machines SET last_seen=?1 WHERE machine_id=?2", params!(global::timestamp() as i64, machine_id));
+}
+
+// The machine a user account belongs to, when the account IS one of a cabinet's
+// own two identities. A card-bound player account is nobody's, and answers None
+pub fn machine_of_account(user_id: i64) -> Option<JsonValue> {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).ok()?;
+    let mut stmt = conn.prepare("SELECT machine_id FROM machines WHERE machine_user_id=?1 OR guest_user_id=?1").ok()?;
+    let machine_id: String = stmt.query_row(params!(user_id), |row| row.get(0)).ok()?;
+    machine_row(&conn, &machine_id)
+}
+
+pub fn delete_machine(machine_id: &str) {
+    DATABASE.lock_and_exec("DELETE FROM plays WHERE machine_id=?1", params!(machine_id));
+    DATABASE.lock_and_exec("UPDATE cards SET last_machine_id='', last_session=0, session_until=0 WHERE last_machine_id=?1", params!(machine_id));
+    DATABASE.lock_and_exec("DELETE FROM machines WHERE machine_id=?1", params!(machine_id));
+}
+
+// Every machine with its play count, newest sighting first - the webui list
+pub fn list_machines() -> JsonValue {
+    let Ok(conn) = rusqlite::Connection::open(DATABASE.get_path()) else {
+        return array![];
+    };
+    let Ok(mut stmt) = conn.prepare("
+        SELECT m.machine_id, m.name, m.machine_user_id, m.guest_user_id, m.created, m.last_seen,
+               (SELECT COUNT(*) FROM plays p WHERE p.machine_id = m.machine_id),
+               (SELECT COUNT(*) FROM plays p WHERE p.machine_id = m.machine_id AND p.cleared <> 0)
+        FROM machines m ORDER BY m.last_seen DESC
+    ") else {
+        return array![];
+    };
+    let Ok(mapped) = stmt.query_map(params!(), |row| {
+        Ok(object!{
+            machine_id: row.get::<usize, String>(0)?,
+            name: row.get::<usize, String>(1)?,
+            machine_user_id: row.get::<usize, i64>(2)?,
+            guest_user_id: row.get::<usize, i64>(3)?,
+            created: row.get::<usize, i64>(4)?,
+            last_seen: row.get::<usize, i64>(5)?,
+            play_count: row.get::<usize, i64>(6)?,
+            cleared_count: row.get::<usize, i64>(7)?
+        })
+    }) else {
+        return array![];
+    };
+    let mut rv = array![];
+    for row in mapped.flatten() {
+        rv.push(row).unwrap();
+    }
+    rv
+}
+
+// Machines whose last sighting is older than `cutoff`. The two account ids come
+// back with them: the sweeper deletes the accounts in the same pass
+pub fn machines_last_seen_before(cutoff: i64) -> JsonValue {
+    let Ok(conn) = rusqlite::Connection::open(DATABASE.get_path()) else {
+        return array![];
+    };
+    let Ok(mut stmt) = conn.prepare("SELECT machine_id, machine_user_id, guest_user_id, last_seen FROM machines WHERE last_seen < ?1") else {
+        return array![];
+    };
+    let Ok(mapped) = stmt.query_map(params!(cutoff), |row| {
+        Ok(object!{
+            machine_id: row.get::<usize, String>(0)?,
+            machine_user_id: row.get::<usize, i64>(1)?,
+            guest_user_id: row.get::<usize, i64>(2)?,
+            last_seen: row.get::<usize, i64>(3)?
+        })
+    }) else {
+        return array![];
+    };
+    let mut rv = array![];
+    for row in mapped.flatten() {
+        rv.push(row).unwrap();
+    }
+    rv
+}
+
+pub fn card_user(card_id: &str) -> Option<i64> {
+    DATABASE.lock_and_select_type("SELECT user_id FROM cards WHERE card_id=?1", params!(card_id)).ok()
+}
+
+// Point a card at an account. `created` survives a re-bind: the card is the same
+// physical object, only the account behind it changed. The cabinet record is
+// cleared, because the previous holder's sessions say nothing about this one -
+// and so is the LP-free window, which was bought for the previous account
+pub fn set_card(card_id: &str, user_id: i64) {
+    DATABASE.lock_and_exec(
+        "INSERT INTO cards (card_id, user_id, created, last_machine_id, last_session, session_until) VALUES (?1, ?2, ?3, '', 0, 0)
+         ON CONFLICT(card_id) DO UPDATE SET user_id=?2, last_machine_id='', last_session=0, session_until=0",
+        params!(card_id, user_id, global::timestamp() as i64)
+    );
+}
+
+// The cabinet this card is playing at right now and how long the credit it just
+// paid buys LP-free lives for. Written by /api/arcade/session, and only there:
+// the session is the one moment the server knows a credit was taken
+pub fn open_card_session(card_id: &str, machine_id: &str, until: i64) {
+    DATABASE.lock_and_exec(
+        "UPDATE cards SET last_machine_id=?1, last_session=?2, session_until=?3 WHERE card_id=?4",
+        params!(machine_id, global::timestamp() as i64, until, card_id)
+    );
+}
+
+// The card of this account whose cabinet session is still open at `now`, as
+// (card id, when the session started). None when no card of the account is at a
+// cabinet - which is every phone account, and every card between credits.
+pub fn live_card_session(user_id: i64, now: i64) -> Option<(String, i64)> {
+    let conn = rusqlite::Connection::open(DATABASE.get_path()).ok()?;
+    let mut stmt = conn.prepare(
+        "SELECT card_id, last_session FROM cards WHERE user_id=?1 AND session_until>?2 ORDER BY session_until DESC LIMIT 1"
+    ).ok()?;
+    stmt.query_row(params!(user_id, now), |row| Ok((row.get::<usize, String>(0)?, row.get::<usize, i64>(1)?))).ok()
+}
+
+// A live starting inside the window pushes its end back, so a credit whose songs
+// run long is not cut off mid-play. Only ever forward, and never past the
+// ceiling the caller computed from the session itself: extending without a
+// ceiling would turn one credit into an endless supply of LP-free lives
+pub fn extend_card_session(card_id: &str, until: i64) {
+    DATABASE.lock_and_exec(
+        "UPDATE cards SET session_until=?1 WHERE card_id=?2 AND session_until<?1",
+        params!(until, card_id)
+    );
+}
+
+// Only the session tests need to age a card's window; production code only ever
+// opens one at a session or pushes it forward through extend_card_session
+#[cfg(test)]
+pub fn backdate_card_session_for_test(card_id: &str, last_session: i64, session_until: i64) {
+    DATABASE.lock_and_exec(
+        "UPDATE cards SET last_session=?1, session_until=?2 WHERE card_id=?3",
+        params!(last_session, session_until, card_id)
+    );
+}
+
+// The machine that most recently ran a session for this account through any of
+// its cards. Empty when the account has no card, or has never been at a cabinet
+pub fn last_machine_of_card_account(user_id: i64) -> Option<String> {
+    let machine_id: String = DATABASE.lock_and_select_type(
+        "SELECT last_machine_id FROM cards WHERE user_id=?1 AND last_machine_id<>'' ORDER BY last_session DESC LIMIT 1",
+        params!(user_id)
+    ).ok()?;
+    if machine_id.is_empty() {
+        return None;
+    }
+    Some(machine_id)
+}
+
+pub fn account_has_card(user_id: i64) -> bool {
+    DATABASE.lock_and_select("SELECT card_id FROM cards WHERE user_id=?1", params!(user_id)).is_ok()
+}
+
+pub fn insert_play(machine_id: &str, user_id: i64, live_id: i64, level: i64, score: i64, rank: i64, cleared: bool) {
+    DATABASE.lock_and_exec(
+        "INSERT INTO plays (machine_id, user_id, live_id, level, score, rank, at, cleared) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)",
+        params!(machine_id, user_id, live_id, level, score, rank, global::timestamp() as i64, i64::from(cleared))
+    );
+}
+
+// Only the sweeper's own test needs to move a cabinet's clock; production code
+// only ever stamps last_seen forward through touch_machine
+#[cfg(test)]
+pub fn backdate_machine_for_test(machine_id: &str, last_seen: i64) {
+    DATABASE.lock_and_exec("UPDATE machines SET last_seen=?1 WHERE machine_id=?2", params!(last_seen, machine_id));
+}
+
+pub fn play_count(machine_id: &str) -> i64 {
+    DATABASE.lock_and_select_type("SELECT COUNT(*) FROM plays WHERE machine_id=?1", params!(machine_id)).unwrap_or(0)
+}
+
+// The cabinet's ledger, newest first. Only the tests read it back today - the
+// webui counts rows rather than listing them - but the ledger exists to be read
+pub fn plays_of_machine(machine_id: &str) -> JsonValue {
+    let Ok(conn) = rusqlite::Connection::open(DATABASE.get_path()) else {
+        return array![];
+    };
+    let Ok(mut stmt) = conn.prepare(
+        "SELECT user_id, live_id, level, score, rank, at, cleared FROM plays WHERE machine_id=?1 ORDER BY id DESC"
+    ) else {
+        return array![];
+    };
+    let Ok(mapped) = stmt.query_map(params!(machine_id), |row| {
+        Ok(object!{
+            user_id: row.get::<usize, i64>(0)?,
+            live_id: row.get::<usize, i64>(1)?,
+            level: row.get::<usize, i64>(2)?,
+            score: row.get::<usize, i64>(3)?,
+            rank: row.get::<usize, i64>(4)?,
+            at: row.get::<usize, i64>(5)?,
+            cleared: row.get::<usize, i64>(6)? != 0
+        })
+    }) else {
+        return array![];
+    };
+    let mut rv = array![];
+    for row in mapped.flatten() {
+        rv.push(row).unwrap();
+    }
+    rv
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // A cabinet owns its two accounts, is found from either of them, and its
+    // last_seen is what the purge sweeper measures
+    #[test]
+    fn a_machine_owns_its_two_accounts() {
+        let _lock = crate::runtime::lock_test_data_path();
+
+        let id = generate_machine_id();
+        assert_eq!(id.len(), 16);
+        assert!(id.chars().all(|c| c.is_ascii_hexdigit()));
+
+        insert_machine(&id, "Cabinet 1", 111_111_111_111_111, 222_222_222_222_222);
+        let machine = get_machine(&id).unwrap();
+        assert_eq!(machine["name"].as_str(), Some("Cabinet 1"));
+        assert_eq!(machine["machine_user_id"].as_i64(), Some(111_111_111_111_111));
+        assert_eq!(machine["guest_user_id"].as_i64(), Some(222_222_222_222_222));
+
+        // Either of the two identities finds the cabinet; a stranger does not
+        assert_eq!(machine_of_account(111_111_111_111_111).unwrap()["machine_id"].as_str(), Some(id.as_str()));
+        assert_eq!(machine_of_account(222_222_222_222_222).unwrap()["machine_id"].as_str(), Some(id.as_str()));
+        assert!(machine_of_account(999_999_999_999_999).is_none());
+
+        // Aged out by the sweeper's cutoff, and only then
+        let seen = machine["last_seen"].as_i64().unwrap();
+        assert!(machines_last_seen_before(seen + 1).members().any(|m| m["machine_id"] == id.as_str()));
+        assert!(!machines_last_seen_before(seen).members().any(|m| m["machine_id"] == id.as_str()));
+
+        delete_machine(&id);
+        assert!(get_machine(&id).is_none());
+    }
+
+    // A card names an account; a re-bind repoints it and drops the previous
+    // holder's cabinet record; plays are attributed to the cabinet the card last
+    // sat at and die with the machine
+    #[test]
+    fn a_card_names_an_account_and_its_last_cabinet() {
+        let _lock = crate::runtime::lock_test_data_path();
+
+        let machine = generate_machine_id();
+        insert_machine(&machine, "Cabinet 2", 333_333_333_333_333, 444_444_444_444_444);
+        let card = "0123456789012345";
+
+        assert!(card_user(card).is_none());
+        set_card(card, 555_555_555_555_555);
+        assert_eq!(card_user(card), Some(555_555_555_555_555));
+        assert!(account_has_card(555_555_555_555_555));
+        // Never at a cabinet yet
+        assert!(last_machine_of_card_account(555_555_555_555_555).is_none());
+
+        let now = global::timestamp() as i64;
+        open_card_session(card, &machine, now + 60);
+        assert_eq!(last_machine_of_card_account(555_555_555_555_555).as_deref(), Some(machine.as_str()));
+
+        // A re-bind keeps the card, moves the account and forgets the cabinet -
+        // and the window the previous account's credit paid for
+        set_card(card, 666_666_666_666_666);
+        assert_eq!(card_user(card), Some(666_666_666_666_666));
+        assert!(!account_has_card(555_555_555_555_555));
+        assert!(last_machine_of_card_account(666_666_666_666_666).is_none());
+        assert!(live_card_session(666_666_666_666_666, now).is_none(), "a re-bind carried the previous account's credit over");
+
+        assert_eq!(play_count(&machine), 0);
+        insert_play(&machine, 666_666_666_666_666, 1100101, 4, 654_321, 3, true);
+        insert_play(&machine, 666_666_666_666_666, 1100101, 4, 123_456, 2, false);
+        assert_eq!(play_count(&machine), 2);
+        // A failed song is a song: it is in the ledger and in the total, and the
+        // cleared count is what separates the two
+        assert!(list_machines().members().any(|m|
+            m["machine_id"] == machine.as_str() && m["play_count"] == 2 && m["cleared_count"] == 1
+        ));
+        let ledger = plays_of_machine(&machine);
+        assert_eq!(ledger.len(), 2);
+        assert_eq!(ledger[0]["cleared"].as_bool(), Some(false));
+        assert_eq!(ledger[0]["score"].as_i64(), Some(123_456));
+        assert_eq!(ledger[1]["cleared"].as_bool(), Some(true));
+
+        // Removing the cabinet takes its ledger with it and unlinks the card
+        open_card_session(card, &machine, now + 60);
+        delete_machine(&machine);
+        assert_eq!(play_count(&machine), 0);
+        assert!(last_machine_of_card_account(666_666_666_666_666).is_none());
+        assert!(live_card_session(666_666_666_666_666, now).is_none(), "a retired cabinet left a credit open");
+        assert_eq!(card_user(card), Some(666_666_666_666_666));
+    }
+
+    // The credit a card paid for is a window on its own row: open until it is
+    // not, pushed forward but never backward, and never shared with another card
+    // of another account
+    #[test]
+    fn a_credit_opens_a_window_that_closes_on_its_own() {
+        let _lock = crate::runtime::lock_test_data_path();
+
+        let machine = generate_machine_id();
+        insert_machine(&machine, "Cabinet 3", 777_777_777_777_777, 888_888_888_888_888);
+        let card = "1212121212121212";
+        let user = 121_212_121_212_121;
+        let now = global::timestamp() as i64;
+
+        // A mapping with no session behind it is not a cabinet session
+        set_card(card, user);
+        assert!(live_card_session(user, now).is_none());
+
+        open_card_session(card, &machine, now + 600);
+        let (open_card, opened) = live_card_session(user, now).expect("the credit did not open a window");
+        assert_eq!(open_card, card);
+        assert!(opened <= now && opened >= now - 5, "the session start was not stamped: {} vs {}", opened, now);
+
+        // The window closes by itself, with nothing to sweep
+        assert!(live_card_session(user, now + 599).is_some());
+        assert!(live_card_session(user, now + 600).is_none(), "the window outlived its own expiry");
+        assert!(live_card_session(user, now + 601).is_none());
+
+        // A live inside it pushes it forward, and only forward
+        extend_card_session(card, now + 1200);
+        assert!(live_card_session(user, now + 900).is_some());
+        extend_card_session(card, now + 300);
+        assert!(live_card_session(user, now + 900).is_some(), "an extension moved the window backwards");
+
+        // Another account's card is untouched by any of it
+        let other_card = "3434343434343434";
+        let other_user = 343_434_343_434_343;
+        set_card(other_card, other_user);
+        assert!(live_card_session(other_user, now).is_none());
+
+        delete_machine(&machine);
+    }
+}

src/database/custom_3dmv.rs

@@ -0,0 +1,217 @@
+use lazy_static::lazy_static;
+use rusqlite::params;
+use jzon::{array, JsonValue};
+
+use crate::sql::SQLite;
+
+lazy_static! {
+    static ref DATABASE: SQLite = SQLite::new("custom_3dmv.db", setup_tables);
+}
+
+// mv_id is its own namespace: it never appears where a music_id or a card id
+// could, so the band only has to avoid colliding with itself. Ids are never
+// reused after a delete (high-water mark below), so a client's cached copy of
+// a dead id can't get confused with a later upload
+pub const FIRST_MV_ID: i64 = 20001;
+pub const LAST_MV_ID: i64 = 99_999;
+
+// One JSON blob per MV, in the exact shape /api/custom_3dmv/list serves -
+// except `published`, which lives in its own column (the catalog filter
+// queries it) and is only injected for the webui manage view
+fn setup_tables(conn: &rusqlite::Connection) {
+    conn.execute_batch("
+CREATE TABLE IF NOT EXISTS mvs (
+    mv_id      BIGINT NOT NULL PRIMARY KEY,
+    music_id   BIGINT NOT NULL,
+    owner_id   BIGINT NOT NULL,
+    mv         TEXT NOT NULL,
+    published  INT NOT NULL DEFAULT 0
+);
+CREATE TABLE IF NOT EXISTS revision (
+    id          INT NOT NULL PRIMARY KEY,
+    revision    BIGINT NOT NULL,
+    last_mv_id  BIGINT NOT NULL
+);
+    ").unwrap();
+}
+
+pub fn get_revision() -> i64 {
+    DATABASE.lock_and_select("SELECT revision FROM revision WHERE id=1", params!()).unwrap_or_default().parse::<i64>().unwrap_or(0)
+}
+
+// Bumped on every upload/update/delete/publish change so the client can tell
+// its cached catalog is stale
+pub fn bump_revision() {
+    DATABASE.lock_and_exec("INSERT INTO revision (id, revision, last_mv_id) VALUES (1, 1, 0) ON CONFLICT(id) DO UPDATE SET revision=revision+1", params!());
+}
+
+// last_mv_id is the high-water mark and only ever rises, so MAX() over the
+// live rows is a floor, not the answer
+pub fn next_mv_id() -> i64 {
+    let issued = DATABASE.lock_and_select("SELECT last_mv_id FROM revision WHERE id=1", params!()).unwrap_or_default().parse::<i64>().unwrap_or(0);
+    let max = DATABASE.lock_and_select("SELECT MAX(mv_id) FROM mvs", params!()).unwrap_or_default().parse::<i64>().unwrap_or(0);
+    std::cmp::max(std::cmp::max(issued, max), FIRST_MV_ID - 1) + 1
+}
+
+pub fn insert_mv(mv_id: i64, music_id: i64, owner_id: i64, mv: &JsonValue, published: bool) {
+    DATABASE.lock_and_exec(
+        "INSERT INTO mvs (mv_id, music_id, owner_id, mv, published) VALUES (?1, ?2, ?3, ?4, ?5)",
+        params!(mv_id, music_id, owner_id, jzon::stringify(mv.clone()), published as i64)
+    );
+    DATABASE.lock_and_exec("INSERT INTO revision (id, revision, last_mv_id) VALUES (1, 0, ?1) ON CONFLICT(id) DO UPDATE SET last_mv_id=?1", params!(mv_id));
+}
+
+// The catalog blob only. The owner and the published flag live in their own
+// columns and are untouched here; music_id is fixed for the life of the MV
+pub fn update_mv(mv_id: i64, mv: &JsonValue) {
+    DATABASE.lock_and_exec("UPDATE mvs SET mv=?1 WHERE mv_id=?2", params!(jzon::stringify(mv.clone()), mv_id));
+}
+
+pub fn delete_mv(mv_id: i64) {
+    DATABASE.lock_and_exec("DELETE FROM mvs WHERE mv_id=?1", params!(mv_id));
+}
+
+pub fn get_mv(mv_id: i64) -> Option<JsonValue> {
+    let mv = DATABASE.lock_and_select("SELECT mv FROM mvs WHERE mv_id=?1", params!(mv_id)).ok()?;
+    jzon::parse(&mv).ok()
+}
+
+pub fn get_mv_owner(mv_id: i64) -> Option<i64> {
+    DATABASE.lock_and_select("SELECT owner_id FROM mvs WHERE mv_id=?1", params!(mv_id)).ok()?.parse::<i64>().ok()
+}
+
+pub fn get_mv_music_id(mv_id: i64) -> Option<i64> {
+    DATABASE.lock_and_select("SELECT music_id FROM mvs WHERE mv_id=?1", params!(mv_id)).ok()?.parse::<i64>().ok()
+}
+
+pub fn is_published(mv_id: i64) -> bool {
+    DATABASE.lock_and_select("SELECT published FROM mvs WHERE mv_id=?1", params!(mv_id)).unwrap_or_default() == "1"
+}
+
+pub fn set_published(mv_id: i64, published: bool) {
+    DATABASE.lock_and_exec("UPDATE mvs SET published=?1 WHERE mv_id=?2", params!(published as i64, mv_id));
+}
+
+pub fn mv_count_for_owner(owner_id: i64) -> i64 {
+    DATABASE.lock_and_select_type::<i64>("SELECT COUNT(*) FROM mvs WHERE owner_id=?1", params!(owner_id)).unwrap_or(0)
+}
+
+fn parse_blobs(rows: JsonValue) -> JsonValue {
+    let mut rv = array![];
+    for data in rows.members() {
+        if let Ok(parsed) = jzon::parse(&data.to_string()) {
+            rv.push(parsed).unwrap();
+        }
+    }
+    rv
+}
+
+// The MV catalog this user is served: every published MV plus their own
+// drafts, filtered against `music_ids` - the music ids the SAME user's
+// custom-song catalog delivers. The closure is what keeps the response
+// referentially sound: a served MV must never name a music_id the song
+// catalog failed to deliver (a published MV for someone else's private song
+// stays invisible)
+pub fn get_mvs_for_user(user_id: i64, music_ids: &[i64]) -> JsonValue {
+    let rows = parse_blobs(DATABASE.lock_and_select_all(
+        "SELECT mv FROM mvs WHERE published=1 OR owner_id=?1 ORDER BY mv_id",
+        params!(user_id)
+    ).unwrap_or(array![]));
+    let mut rv = array![];
+    for mv in rows.members() {
+        if music_ids.contains(&mv["music_id"].as_i64().unwrap_or(0)) {
+            rv.push(mv.clone()).unwrap();
+        }
+    }
+    rv
+}
+
+// MV blobs plus the flag column, for the webui manage view
+pub fn get_mvs_by_owner(owner_id: i64) -> JsonValue {
+    let rows = parse_blobs(DATABASE.lock_and_select_all("SELECT mv FROM mvs WHERE owner_id=?1 ORDER BY mv_id", params!(owner_id)).unwrap_or(array![]));
+    let mut rv = array![];
+    for mv in rows.members() {
+        let mut mv = mv.clone();
+        mv["published"] = is_published(mv["mv_id"].as_i64().unwrap_or(0)).into();
+        rv.push(mv).unwrap();
+    }
+    rv
+}
+
+// The webui MV browser: published MVs whose song the viewer can see, plus the
+// owner id so the page can label the uploader
+pub fn get_browse_mvs(viewer_music_ids: &[i64]) -> JsonValue {
+    let rows = parse_blobs(DATABASE.lock_and_select_all("SELECT mv FROM mvs WHERE published=1 ORDER BY mv_id", params!()).unwrap_or(array![]));
+    let mut rv = array![];
+    for mv in rows.members() {
+        if !viewer_music_ids.contains(&mv["music_id"].as_i64().unwrap_or(0)) {
+            continue;
+        }
+        let mut mv = mv.clone();
+        mv["owner_id"] = get_mv_owner(mv["mv_id"].as_i64().unwrap_or(0)).unwrap_or(0).into();
+        rv.push(mv).unwrap();
+    }
+    rv
+}
+
+// Every MV attached to a song, for the delete cascade
+pub fn mv_ids_for_music(music_id: i64) -> Vec<i64> {
+    let rows = DATABASE.lock_and_select_all("SELECT mv_id FROM mvs WHERE music_id=?1 ORDER BY mv_id", params!(music_id)).unwrap_or(array![]);
+    rows.members().filter_map(|id| id.as_i64()).collect()
+}
+
+// Which of these candidate ids no longer exist. Only the MV band is ever
+// considered and ids are never reused, so a wipe is final. An MV that's
+// merely unpublished still has its row - only genuinely deleted ids return
+pub fn dead_mv_ids(candidates: &JsonValue) -> JsonValue {
+    let mut ids: Vec<i64> = Vec::new();
+    for id in candidates.members() {
+        let Some(id) = id.as_i64() else { continue; };
+        if (FIRST_MV_ID..=LAST_MV_ID).contains(&id) && !ids.contains(&id) {
+            ids.push(id);
+        }
+    }
+    if ids.is_empty() {
+        return array![];
+    }
+    let list = ids.iter().map(|id| id.to_string()).collect::<Vec<_>>().join(",");
+    let alive = DATABASE.lock_and_select_all(&format!("SELECT mv_id FROM mvs WHERE mv_id IN ({})", list), params!()).unwrap_or(array![]);
+    let mut rv = array![];
+    for id in ids {
+        if !alive.contains(id) {
+            rv.push(id).unwrap();
+        }
+    }
+    rv
+}
+
+// Every stored catalog blob, unparsed and unfiltered. Only the startup blob
+// sweep needs the whole table, and a read failure must never look like an
+// empty catalog (the sweep would then delete every blob), so this returns
+// None rather than an empty array on error
+pub fn all_mv_blobs() -> Option<JsonValue> {
+    DATABASE.lock_and_select_all("SELECT mv FROM mvs ORDER BY mv_id", params!()).ok()
+}
+
+// Blobs are content-addressed and may be shared between MVs (or roles), so
+// every candidate row is checked - a single-row scan could land on a
+// coincidental substring match and miss the real reference
+pub fn blob_in_use(md5: &str) -> bool {
+    let rows = DATABASE.lock_and_select_all("SELECT mv FROM mvs WHERE mv LIKE ?1", params!(format!("%{}%", md5))).unwrap_or(array![]);
+    for blob in rows.members() {
+        if let Ok(mv) = jzon::parse(&blob.to_string()) {
+            if mv["files"].members().any(|file| file["md5"].as_str() == Some(md5)) {
+                return true;
+            }
+        }
+    }
+    false
+}
+
+// Two-step content-addressed lookup for the data route: the LIKE scan finds a
+// candidate row cheaply, then the files array confirms the md5 is really a
+// stored file of a live MV (and not a substring coincidence elsewhere in the
+// blob). The blob path itself derives from the md5
+pub fn find_blob_by_md5(md5: &str) -> bool {
+    blob_in_use(md5)
+}

src/database/custom_song.rs

@@ -257,6 +257,14 @@ pub fn public_song_title(music_id: i64, english: bool) -> Option<String> {
     Some(if english && !name_en.is_empty() { name_en } else { name })
 }
 
+// Whether the song exists and is publicly visible - what lets another
+// uploader attach cross-feature content (a custom 3D MV) to it. The
+// existence check comes first: get_visibility defaults to "public" for an
+// absent row
+pub fn song_publicly_visible(music_id: i64) -> bool {
+    get_song_owner(music_id).is_some() && get_visibility(music_id) == "public"
+}
+
 pub fn get_music_ids_for_user(user_id: i64) -> JsonValue {
     DATABASE.lock_and_select_all("
     SELECT music_id FROM songs

src/database/permissions.rs

@@ -9,38 +9,34 @@ lazy_static! {
     static ref DATABASE: SQLite = SQLite::new("permissions.db", setup_tables);
 }
 
-// Scopes are flat dotted strings and imply everything below them: holding
-// "card" grants "card.upload", and "*" grants everything. That hierarchy is
-// the only notion of "level" - there is no rank integer, so a new capability
-// is one line here and never a renumbering of anything else.
-//
-// Every call site must pass one of these consts, never a literal: an
-// unrecognised scope string can only ever fail closed in has(), but grant()
-// rejects it outright so a typo can't be persisted either.
 pub const ALL: &str = "*";
 
 pub const CARD: &str = "card";
-// Create custom cards/characters, and edit or delete your OWN uploads
 pub const CARD_UPLOAD: &str = "card.upload";
-// Publish/unpublish and mark obtainable, on your OWN uploads
 pub const CARD_PUBLISH: &str = "card.publish";
-// Moderation: edit, delete, publish or unpublish ANYBODY's cards
 pub const CARD_EDIT: &str = "card.edit";
 
 pub const PERMISSION: &str = "permission";
 pub const PERMISSION_GRANT: &str = "permission.grant";
 pub const PERMISSION_REVOKE: &str = "permission.revoke";
 
-// The whole grantable vocabulary, subtree roots included. Anything not in here
-// cannot be written to the table
+pub const ANNOUNCEMENT: &str = "announcement";
+pub const ANNOUNCEMENT_MANAGE: &str = "announcement.manage";
+
+// Uploading/publishing your own MVs needs no scope (like custom songs);
+// 3dmv.edit is moderation over anybody's
+pub const MV: &str = "3dmv";
+pub const MV_EDIT: &str = "3dmv.edit";
+
 pub const SCOPES: &[&str] = &[
     ALL,
     CARD, CARD_UPLOAD, CARD_PUBLISH, CARD_EDIT,
-    PERMISSION, PERMISSION_GRANT, PERMISSION_REVOKE
+    PERMISSION, PERMISSION_GRANT, PERMISSION_REVOKE,
+    ANNOUNCEMENT, ANNOUNCEMENT_MANAGE,
+    MV, MV_EDIT
 ];
 
-// Grants live in their own database rather than in userdata.db so that an
-// account purge can never take administrative state with it
+
 fn setup_tables(conn: &rusqlite::Connection) {
     conn.execute_batch("
 CREATE TABLE IF NOT EXISTS grants (
@@ -53,18 +49,11 @@ CREATE TABLE IF NOT EXISTS grants (
     ").unwrap();
 }
 
-// The owners are a process-level flag (--owner) rather than table rows: they
-// are the bootstrap grantors, so they have to work on a fresh install with an
-// empty (or hand-deleted) permissions.db, and they must not be revocable
-// through the webui
 fn is_owner(user_id: i64) -> bool {
     user_id > 0 && crate::runtime::get_owners().contains(&user_id)
 }
 
-// Every scope that would satisfy a request for `scope`: "*", each dotted
-// ancestor, and the scope itself. Matching is on whole dot-separated segments,
-// so "car" never satisfies "card.upload"
-fn implied_by(scope: &str) -> Vec<String> {
+fn has_permission(scope: &str) -> Vec<String> {
     if scope == ALL {
         return vec![String::from(ALL)];
     }
@@ -80,7 +69,7 @@ fn implied_by(scope: &str) -> Vec<String> {
     rv
 }
 
-fn held_scopes(user_id: i64) -> Vec<String> {
+fn get_permissions(user_id: i64) -> Vec<String> {
     let rows = DATABASE.lock_and_select_all("SELECT scope FROM grants WHERE user_id=?1 ORDER BY scope", params!(user_id)).unwrap_or(array![]);
     rows.members().map(|scope| scope.to_string()).collect()
 }
@@ -100,13 +89,11 @@ pub fn has(user_id: i64, scope: &str) -> bool {
     if is_owner(user_id) {
         return true;
     }
-    let held = held_scopes(user_id);
-    implied_by(scope).iter().any(|candidate| held.contains(candidate))
+    let held = get_permissions(user_id);
+    has_permission(scope).iter().any(|candidate| held.contains(candidate))
 }
 
-// Everything this user holds, for the webui to hide what it can't use. An
-// owner's implicit "*" is reported here even though it has no row
-pub fn scopes_for(user_id: i64) -> JsonValue {
+pub fn get_user_permissions(user_id: i64) -> JsonValue {
     if user_id <= 0 {
         return array![];
     }
@@ -114,7 +101,7 @@ pub fn scopes_for(user_id: i64) -> JsonValue {
     if is_owner(user_id) {
         scopes.push(String::from(ALL));
     }
-    for scope in held_scopes(user_id) {
+    for scope in get_permissions(user_id) {
         if !scopes.contains(&scope) {
             scopes.push(scope);
         }
@@ -148,16 +135,6 @@ pub fn grants() -> JsonValue {
     rv
 }
 
-// The only way a row is ever written. Two conditions, both required:
-//
-//   1. the grantor holds permission.grant, and
-//   2. the grantor holds the scope being granted
-//
-// (2) is what makes escalation impossible. has() only ever implies downwards,
-// so holding a leaf never satisfies its parent - a user with card.upload can
-// hand out card.upload and nothing else, and can no more grant themselves
-// "card" (or "*") than they can grant it to anybody else. Both checks read the
-// live table, so a revoked grantor loses the ability on their next request
 pub fn grant(user_id: i64, scope: &str, granted_by: i64) -> Result<(), String> {
     if user_id <= 0 {
         return Err(String::from("Invalid user id"));
@@ -175,9 +152,6 @@ pub fn grant(user_id: i64, scope: &str, granted_by: i64) -> Result<(), String> {
     Ok(())
 }
 
-// Revoking needs the same "you must hold it yourself" rule as granting, so a
-// junior admin can't strip a senior one. An owner has no rows to delete, but
-// the check is explicit so it stays true if that ever changes
 pub fn revoke(user_id: i64, scope: &str, revoked_by: i64) -> Result<(), String> {
     if user_id <= 0 {
         return Err(String::from("Invalid user id"));
@@ -198,6 +172,11 @@ pub fn revoke(user_id: i64, scope: &str, revoked_by: i64) -> Result<(), String>
     Ok(())
 }
 
+
+
+// rest of file is tests that ai wrote
+// I didn't read through them because I don't super care about tests but they probably do something
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -258,7 +237,7 @@ mod tests {
         for scope in SCOPES {
             assert!(!has(105, scope), "scope {}", scope);
         }
-        assert!(scopes_for(105).is_empty());
+        assert!(get_user_permissions(105).is_empty());
         assert!(!has(0, ALL));
         assert!(!has(-1, ALL));
         wipe(105);
@@ -276,7 +255,7 @@ mod tests {
         insert(110, CARD_UPLOAD, 0);
         grant(111, CARD_UPLOAD, 110).unwrap();
         grant(111, CARD_UPLOAD, 110).unwrap(); // idempotent
-        assert_eq!(held_scopes(111), vec![String::from(CARD_UPLOAD)]);
+        assert_eq!(get_permissions(111), vec![String::from(CARD_UPLOAD)]);
         assert!(grant(111, CARD_EDIT, 110).is_err());
         assert!(grant(111, CARD, 110).is_err());
         assert!(grant(110, ALL, 110).is_err());
@@ -324,9 +303,9 @@ mod tests {
             assert!(has(118, scope), "scope {}", scope);
             assert!(has(120, scope), "scope {}", scope);
         }
-        assert_eq!(scopes_for(118).len(), 1);
-        assert_eq!(scopes_for(118)[0].to_string(), String::from(ALL));
-        assert!(held_scopes(118).is_empty());
+        assert_eq!(get_user_permissions(118).len(), 1);
+        assert_eq!(get_user_permissions(118)[0].to_string(), String::from(ALL));
+        assert!(get_permissions(118).is_empty());
         // An owner can bootstrap-grant, and can't be revoked
         grant(119, ALL, 118).unwrap();
         assert!(has(119, ALL));
@@ -346,7 +325,7 @@ mod tests {
             assert!(!scope.is_empty());
             assert!(!scope.ends_with('.'));
         }
-        for scope in [CARD_UPLOAD, CARD_PUBLISH, CARD_EDIT, PERMISSION_GRANT, PERMISSION_REVOKE] {
+        for scope in [CARD_UPLOAD, CARD_PUBLISH, CARD_EDIT, PERMISSION_GRANT, PERMISSION_REVOKE, ANNOUNCEMENT_MANAGE, MV_EDIT] {
             assert!(SCOPES.contains(&scope), "scope {}", scope);
         }
     }

src/lib.rs

@@ -31,12 +31,23 @@ pub async fn run_server(in_thread: bool) -> std::io::Result<()> {
 
     if args.purge {
         println!("Purging accounts...");
+        // Cabinets first, so the accounts they take with them are gone before
+        // purge_accounts runs its VACUUM over the same database
+        let machines = crate::router::arcade::purge_machines();
+        if machines > 0 {
+            println!("Purged {} arcade machine(s)", machines);
+        }
         let ct = crate::router::userdata::purge_accounts();
         println!("Purged {} accounts", ct);
     }
 
     router::custom_song::migrate::run();
     router::custom_song::sweep_audio();
+    router::custom_3dmv::sweep_blobs();
+    // The multi-live relay's expiry timers, on the system arbiter rather than on whichever
+    // HTTP worker happened to serve the first WebSocket upgrade — a worker panic must not
+    // be able to strand every room's seats for the life of the process.
+    router::multi_live::start_sweeper();
 
     let rv = HttpServer::new(|| App::new()
     //.wrap(Cors::permissive())

src/options.rs

@@ -44,6 +44,18 @@ pub struct Args {
     #[arg(long, default_value_t = false, help = "Enable the custom cards feature (upload/manage runtime cards and characters). Disabled by default; every custom-cards endpoint and webui element is hidden unless this is set")]
     pub enable_custom_cards: bool,
 
+    #[arg(long, default_value_t = false, help = "Enable the custom 3D MV feature (upload/manage MMD model+motion MVs for custom songs). Disabled by default; every custom-3dmv endpoint and webui element is hidden unless this is set")]
+    pub enable_custom_3dmv: bool,
+
+    #[arg(long, default_value_t = false, help = "Enable arcade mode (cabinet registration, per-machine guest accounts, LP-free arcade lives). Disabled by default; every /api/arcade endpoint and webui element is hidden unless this is set")]
+    pub enable_arcade: bool,
+
+    #[arg(long, default_value_t = 90, help = "Days an arcade machine may go unseen before --purge deletes it together with its machine and guest accounts")]
+    pub arcade_machine_ttl: u64,
+
+    #[arg(long, default_value_t = 30, help = "Minutes a card-bound account may play LP-free after the cabinet ran /api/arcade/session for its card. Each arcade live restarts the window, up to four windows from the session itself; outside it the account is an ordinary phone account and pays LP")]
+    pub arcade_session_ttl: u64,
+
     #[arg(long, value_delimiter = ',', help = "User id(s) of the server owner(s), repeatable or comma separated. Owner accounts implicitly hold every permission scope and are the only ones able to grant scopes on a fresh install")]
     pub owner: Vec<i64>,
 

src/router.rs

@@ -1,4 +1,5 @@
 pub mod start;
+pub mod arcade;
 pub mod global;
 pub mod login;
 pub mod userdata;
@@ -10,6 +11,7 @@ pub mod home;
 pub mod lottery;
 pub mod friend;
 pub mod live;
+pub mod multi_live;
 pub mod event;
 pub mod chat;
 pub mod story;
@@ -22,6 +24,7 @@ pub mod card;
 pub mod shop;
 pub mod custom_song;
 pub mod custom_card;
+pub mod custom_3dmv;
 pub mod rich_text;
 pub mod webui;
 pub mod clear_rate;
@@ -221,11 +224,12 @@ pub async fn request(req: HttpRequest, body: String) -> HttpResponse {
             "/api/webui/cheat" => webui::cheat(req, body),
             "/api/webui/grantPermission" => webui::grant_permission(req, body),
             "/api/webui/revokePermission" => webui::revoke_permission(req, body),
+            "/api/webui/removeArcadeMachine" => webui::remove_arcade_machine(req, body),
+            "/api/webui/bindArcadeCard" => webui::bind_arcade_card(req, body),
             _ => api_req(req, body).await
         }
     } else {
         match req.path() {
-            "/web/announcement" => web::announcement(req),
             "/api/webui/userInfo" => webui::user(req),
             "/live_clear_rate.html" => clear_rate::clearrate_html(req).await,
             "/webui/logout" => webui::logout(req),
@@ -239,7 +243,9 @@ pub async fn request(req: HttpRequest, body: String) -> HttpResponse {
             "/api/webui/listCharacters" => webui::list_characters(req),
             "/api/webui/listSkillCenters" => webui::list_skill_centers(req),
             "/api/webui/customCardLimits" => webui::custom_card_limits(req),
+            "/api/webui/custom3dmvLimits" => webui::custom_3dmv_limits(req),
             "/api/webui/myScopes" => webui::my_scopes(req),
+            "/api/webui/listArcadeMachines" => webui::list_arcade_machines(req),
             _ => api_req(req, body).await
         }
     }
@@ -259,10 +265,12 @@ pub fn configure(cfg: &mut actix_web::web::ServiceConfig) {
                             .route(actix_web::web::get().to(home::gift_get))
                             .route(actix_web::web::post().to(user::gift))
                     )
+                    .configure(arcade::routes)
                     .configure(card::routes)
                     .configure(chat::routes)
                     .configure(custom_song::routes)
                     .configure(custom_card::routes)
+                    .configure(custom_3dmv::routes)
                     .configure(debug::routes)
                     .configure(event::routes)
                     .configure(exchange::routes)
@@ -274,6 +282,7 @@ pub fn configure(cfg: &mut actix_web::web::ServiceConfig) {
                     .configure(login::routes)
                     .configure(lottery::routes)
                     .configure(mission::routes)
+                    .configure(multi_live::routes)
                     .configure(notice::routes)
                     .configure(purchase::routes)
                     .configure(serial_code::routes)
@@ -290,4 +299,6 @@ pub fn configure(cfg: &mut actix_web::web::ServiceConfig) {
     );
     cfg.configure(custom_song::web_routes);
     cfg.configure(custom_card::web_routes);
+    cfg.configure(custom_3dmv::web_routes);
+    cfg.configure(web::routes);
 }

src/router/arcade.rs

@@ -0,0 +1,928 @@
+// Arcade mode: a SIF2 client turned into a rhythm cabinet.
+//
+// A cabinet registers once and gets a machine id plus two accounts it owns
+// forever - the MACHINE account (the identity the attract loop and its demo
+// lives run on) and one reusable GUEST. Every credit calls /session; without a
+// card that rewrites the guest back to the starter state in place, keeping its
+// user id but re-drawing everything a player could have left on it - its login
+// token included - so the machine plays a clean account and the server never
+// accumulates dead users. With a card, the card names the account and the play
+// is real progress on it.
+//
+// Credits replace LP: a live flagged `arcade` runs through live_end_ex with
+// consume_lp = false - the seam /multi_live/end already uses - and its use_lp
+// pinned to one normal play, so rewards, EXP, bonds, high scores and clears all
+// record exactly as they do on a phone while LP is never touched.
+//
+// That flag is money, so it is not taken on trust. It buys a free play only for
+// a machine's own two identities, or for a card account inside the window the
+// credit at /api/arcade/session opened for it, and only when the /live/start
+// this /live/end answers was itself flagged. See arcade_account_at.
+//
+// The whole feature is opt-in (--enable-arcade) and additionally off in
+// --hidden mode. When disabled every endpoint answers like the custom-song
+// endpoints do with their flag off - Api(None), as if it never existed - and
+// nothing touches arcade.db, so no table setup runs.
+
+use jzon::{object, JsonValue};
+use actix_web::{web, Responder};
+
+use crate::router::{databases, global, live, multi_live, userdata, Api, Body};
+use crate::database::arcade as database;
+
+// The name a cabinet falls back to when its operator sent nothing usable
+const DEFAULT_MACHINE_NAME: &str = "ARCADE";
+
+// Guest accounts are created under this name and renamed to their cabinet's own
+// name at the first session (design 4.3: a credit plays as the machine)
+const GUEST_NAME: &str = "GUEST";
+
+// NESiCA ids are 16 ASCII digits; the cap is generous enough for any other
+// reader an I/O provider might present without letting an id become a blob
+const MAX_CARD_ID_LEN: usize = 32;
+
+pub fn routes(cfg: &mut web::ServiceConfig) {
+    cfg.service(
+        web::scope("/arcade")
+            .route("/info", web::get().to(info))
+            .route("/register", web::post().to(register))
+            .route("/session", web::post().to(session))
+            .route("/bind", web::post().to(bind))
+    );
+}
+
+pub fn disabled() -> bool {
+    let args = crate::get_args();
+    args.hidden || !args.enable_arcade
+}
+
+// Days a machine may go unseen before --purge deletes it. 0 means never.
+fn machine_ttl_days() -> u64 {
+    crate::get_args().arcade_machine_ttl
+}
+
+// How long one credit buys LP-free play for the card that paid it. Long enough
+// that a slow credit never runs out mid-song (the design's play is two songs),
+// short enough that a card left on a reader overnight is not an open tap.
+fn session_ttl() -> i64 {
+    crate::get_args().arcade_session_ttl as i64 * 60
+}
+
+// A live played inside the window pushes it back, so a credit that runs long is
+// never cut off - but a credit is a credit, and past this many windows from the
+// session that opened it the extension stops. Without a ceiling one tap of a
+// card would buy LP-free lives for as long as the player kept starting them.
+const MAX_SESSION_WINDOWS: i64 = 4;
+
+// The client writes its request-body flags as 0/1 ints (auto_play, is_omakase,
+// ...), so `arcade` is read as either that or a JSON bool.
+fn flag(value: &JsonValue) -> bool {
+    value.as_bool().unwrap_or(false) || value.as_i64().unwrap_or(0) != 0
+}
+
+// A card id is an identifier, never text: it is refused rather than sanitised,
+// because a mangled id would silently name a different card's account.
+fn card_id(body: &JsonValue) -> Option<String> {
+    let card_id = body["card_id"].as_str().unwrap_or("").trim().to_string();
+    if card_id.is_empty() {
+        return None;
+    }
+    if card_id.len() > MAX_CARD_ID_LEN || !card_id.chars().all(|c| c.is_ascii_alphanumeric()) {
+        return None;
+    }
+    Some(card_id)
+}
+
+// The credit is taken: this card is at this cabinet, and for the next ttl it
+// plays the way a cabinet plays. The single place a window is ever opened -
+// /api/arcade/session is the one moment the server is told a credit was spent.
+fn open_card_session(card: &str, machine_id: &str) {
+    database::open_card_session(card, machine_id, global::timestamp() as i64 + session_ttl());
+}
+
+// An account made for a card nobody has named yet takes the card's last four
+// digits, the way a cabinet prints them on a receipt. The on-cabinet name entry
+// overwrites it.
+fn card_account_name(card_id: &str) -> String {
+    let start = card_id.len().saturating_sub(4);
+    card_id[start..].to_string()
+}
+
+// The account this card was issued seconds ago, and which nothing has happened
+// to since - the only account /api/arcade/session will ever rename.
+//
+// The cabinet's name entry is a second /session for the same card: the first one
+// created the account and answered is_new, the player typed a name, and this is
+// the same call again carrying it. By then the card is KNOWN, so the rename has
+// to be told apart from an ordinary card session, and it has to be told apart
+// hard: a rename that reached a real account would let anyone holding a card id
+// retitle a stranger's save. Every clause below has to hold.
+//
+// Deliberately not a `renamed` column: the account itself carries the proof.
+fn issued_by_this_credit(card: &str, user_id: i64, now: i64, ttl: i64) -> bool {
+    // The credit that created it is still running, at this card. live_card_session
+    // is the window /api/arcade/session opened and nothing else ever opens
+    // (database/arcade.rs:240), so this is "the same credit, still going". `ttl`
+    // is session_ttl() in production and the test's own number in the test - the
+    // shape purge_machines_before and retire_user_at already use here.
+    let Some((open_card, opened)) = database::live_card_session(user_id, now) else {
+        return false;
+    };
+    if open_card != card || now - opened > ttl {
+        return false;
+    }
+    // A cabinet's own machine or guest identity is never a card's account
+    if database::machine_of_account(user_id).is_some() {
+        return false;
+    }
+    // A phone has owned it - the same test bind_card's cleanup trusts
+    if userdata::has_transfer_password(user_id) {
+        return false;
+    }
+    let user = userdata::get_acc_from_uid(user_id);
+    if user["error"].as_bool().unwrap_or(false) {
+        return false;
+    }
+    // It still carries the placeholder /session gave it, and nothing has been
+    // played on it. Either alone would be enough to make a rename harmless; both
+    // together make it provable.
+    if user["user"]["name"].as_str().unwrap_or("") != card_account_name(card) {
+        return false;
+    }
+    user["live_list"].is_empty() && user["live_mission_list"].is_empty()
+}
+
+// The one write a rename is. /api/user does exactly this for a phone player
+// (user.rs:138-140); there is no other name in an account.
+fn rename_account(user_id: i64, login_token: &str, name: &str) {
+    let mut user = userdata::get_acc_from_uid(user_id);
+    user["user"]["name"] = name.into();
+    userdata::save_acc(login_token, user);
+}
+
+// -- endpoints --------------------------------------------------------------
+
+// The client asks this before it offers to convert a device: a server without
+// the module answers None and the Title-menu entry refuses.
+async fn info() -> impl Responder {
+    if disabled() {
+        return Api(None);
+    }
+    Api(Some(object!{
+        "enabled": true,
+        "machine_ttl_days": machine_ttl_days()
+    }))
+}
+
+// Converting a fresh device into a cabinet. Pre-login by nature: the device has
+// no account yet, which is exactly the state the Title-menu entry requires.
+async fn register(Body(body): Body) -> impl Responder {
+    if disabled() {
+        return Api(None);
+    }
+    let name = userdata::starter::clean_name(body["name"].as_str().unwrap_or(""), DEFAULT_MACHINE_NAME);
+
+    let Some((machine_user_id, machine_uuid)) = userdata::starter::create(&name) else {
+        return Api(None);
+    };
+    let Some((guest_user_id, guest_uuid)) = userdata::starter::create(GUEST_NAME) else {
+        // Half a cabinet is worse than none: the machine account has nothing
+        // pointing at it and nobody holding its token, so it goes back.
+        userdata::delete_account(machine_user_id);
+        return Api(None);
+    };
+
+    let machine_id = database::generate_machine_id();
+    database::insert_machine(&machine_id, &name, machine_user_id, guest_user_id);
+    println!("arcade: registered machine {} \"{}\" (machine {}, guest {})", machine_id, name, machine_user_id, guest_user_id);
+
+    Api(Some(object!{
+        "machine_id": machine_id,
+        "machine_user_id": machine_user_id,
+        "machine_uuid": machine_uuid,
+        "guest_user_id": guest_user_id,
+        "guest_uuid": guest_uuid
+    }))
+}
+
+// One credit. Answers the account the player is about to become: the cabinet's
+// guest (reset in place) or, with a card, the account that card names.
+//
+// `name` is the cabinet's on-screen name entry, and it is read in exactly two
+// places: the account a brand new card is issued, and a rename of that same
+// account while the credit that created it is still running (see
+// issued_by_this_credit). A guest credit ignores it - a guest is named after its
+// cabinet - and so does an ordinary card session.
+async fn session(Body(body): Body) -> impl Responder {
+    if disabled() {
+        return Api(None);
+    }
+    let machine_id = body["machine_id"].as_str().unwrap_or("").to_string();
+    let Some(machine) = database::get_machine(&machine_id) else {
+        println!("arcade: session for unknown machine \"{}\"", machine_id);
+        return Api(None);
+    };
+    database::touch_machine(&machine_id);
+    let machine_name = machine["name"].as_str().unwrap_or(DEFAULT_MACHINE_NAME).to_string();
+
+    // A guest credit is a session with no card_id at all (every credit in v1) or
+    // an empty one. Anything else is a card being presented, and a card id that
+    // does not parse is refused rather than quietly played as a guest on
+    // somebody's credit.
+    let presented = !body["card_id"].is_null() && !body["card_id"].as_str().unwrap_or("").trim().is_empty();
+    let card = card_id(&body);
+    if presented && card.is_none() {
+        println!("arcade: machine {} presented an unusable card id", machine_id);
+        return Api(None);
+    }
+    let typed_name = body["name"].as_str().unwrap_or("").trim().to_string();
+
+    let Some(card) = card else {
+        // The cabinet's own guest, rewritten from scratch. Same user id, so the
+        // machine keeps its one guest forever - but a new login token, because
+        // the previous player had a credit's worth of time alone with the old
+        // one. The client adopts the uuid this answer carries (ArcadeEntranceScene
+        // OnSessionResponse -> MngArcadeData.AdoptIdentity), so the rotation is
+        // invisible to it.
+        let guest_user_id = machine["guest_user_id"].as_i64().unwrap_or(0);
+        let Some(uuid) = userdata::starter::reset(guest_user_id, &machine_name) else {
+            println!("arcade: machine {} has no guest account to reset", machine_id);
+            return Api(None);
+        };
+        return Api(Some(object!{
+            "user_id": guest_user_id,
+            "uuid": uuid,
+            "name": machine_name,
+            "is_new": true
+        }));
+    };
+
+    // A known card plays its own account, with every clear it has ever earned
+    if let Some(user_id) = database::card_user(&card) {
+        let uuid = userdata::get_login_token(user_id);
+        if !uuid.is_empty() {
+            // The cabinet's name entry, coming back for the account this credit
+            // just made. Checked BEFORE the window is re-opened, because the
+            // proof is the window the previous call opened.
+            if !typed_name.is_empty() && issued_by_this_credit(&card, user_id, global::timestamp() as i64, session_ttl()) {
+                let named = userdata::starter::clean_name(&typed_name, &card_account_name(&card));
+                rename_account(user_id, &uuid, &named);
+                println!("arcade: machine {} named its new card's account {} \"{}\"", machine_id, user_id, named);
+            }
+            open_card_session(&card, &machine_id);
+            let name = userdata::get_name_and_rank(user_id)["user_name"].as_str().unwrap_or("").to_string();
+            return Api(Some(object!{
+                "user_id": user_id,
+                "uuid": uuid,
+                "name": name,
+                "is_new": false
+            }));
+        }
+        // The mapping outlived its account (deleted through the webui, or aged
+        // out with a machine). The card is not broken: it gets a new account.
+        println!("arcade: card mapping pointed at missing account {} - reissuing", user_id);
+    }
+
+    // A card nobody has seen before. It gets an account named after its own last
+    // four digits unless the cabinet already has a name for it - which it only
+    // does when something other than the entrance's own two-step asked for one.
+    let name = userdata::starter::clean_name(&typed_name, &card_account_name(&card));
+    let Some((user_id, uuid)) = userdata::starter::create(&name) else {
+        return Api(None);
+    };
+    database::set_card(&card, user_id);
+    open_card_session(&card, &machine_id);
+    println!("arcade: machine {} issued account {} to a new card", machine_id, user_id);
+
+    Api(Some(object!{
+        "user_id": user_id,
+        "uuid": uuid,
+        "name": name,
+        "is_new": true
+    }))
+}
+
+// Point a card at an existing (phone) account. The proof is the data-transfer
+// code and its password - the same check /api/user/gglverifymigrationcode makes
+// (user.rs:214-220), through the one function that owns that comparison.
+//
+// Shared by the cabinet's own /api/arcade/bind and the webui account page's
+// form: the browser cannot speak the game protocol (encrypted bodies behind the
+// asset gate), so it gets its own entrance, not its own copy of the rule.
+pub fn bind_card(card: &str, migration_code: &str, pass: &str) -> Result<i64, String> {
+    if disabled() {
+        return Err(String::from("Arcade mode is disabled on this server"));
+    }
+    let Some(card) = card_id(&object!{ "card_id": card }) else {
+        return Err(String::from("That is not a usable card id"));
+    };
+
+    let account = userdata::user::migration::get_acc_transfer(migration_code, pass);
+    if !account["success"].as_bool().unwrap_or(false) || account["user_id"] == 0 {
+        return Err(String::from("Transfer code and password don't match"));
+    }
+    let Some(user_id) = account["user_id"].as_i64() else {
+        return Err(String::from("Transfer code and password don't match"));
+    };
+    // A cabinet's own two identities are not player accounts and may never be
+    // behind a card. The guest in particular is rewritten for a stranger every
+    // credit: a card pointing at it would outlive that reset, and /session hands
+    // out the account's current login token to whoever presents the card. The
+    // proof this bind takes - a transfer code and password - is exactly what a
+    // hostile client can register on a guest during its own credit.
+    if database::machine_of_account(user_id).is_some() {
+        return Err(String::from("That account belongs to an arcade cabinet"));
+    }
+
+    let previous = database::card_user(&card);
+    database::set_card(&card, user_id);
+
+    // A card that was carrying a throwaway account the cabinet made for it takes
+    // that account with it. Anything the player might care about keeps the card
+    // from taking it: see orphan_of_a_rebound_card.
+    if let Some(previous) = previous
+        && previous != user_id
+        && orphan_of_a_rebound_card(previous) {
+        println!("arcade: card {} left empty account {} behind - removing", card, previous);
+        userdata::delete_account(previous);
+    }
+
+    println!("arcade: card {} now plays as account {}", card, user_id);
+    Ok(user_id)
+}
+
+async fn bind(Body(body): Body) -> impl Responder {
+    match bind_card(
+        body["card_id"].as_str().unwrap_or(""),
+        &body["migrationCode"].to_string(),
+        &body["pass"].to_string()
+    ) {
+        Ok(user_id) => Api(Some(object!{ "user_id": user_id })),
+        Err(reason) => {
+            println!("arcade: bind refused - {}", reason);
+            Api(None)
+        }
+    }
+}
+
+// An account /api/arcade/session issued to an unknown card that was then never
+// used for anything. Every one of these has to hold for it to be thrown away
+// with the card, because a false positive deletes somebody's save:
+//   * no other card still points at it,
+//   * it is not a cabinet's own machine or guest identity,
+//   * it has never registered a transfer password, so no phone ever owned it,
+//   * and it has no live record at all - nothing was ever played on it.
+fn orphan_of_a_rebound_card(user_id: i64) -> bool {
+    if database::account_has_card(user_id) {
+        return false;
+    }
+    if database::machine_of_account(user_id).is_some() {
+        return false;
+    }
+    if userdata::has_transfer_password(user_id) {
+        return false;
+    }
+    let user = userdata::get_acc_from_uid(user_id);
+    if user["error"].as_bool().unwrap_or(false) {
+        return false;
+    }
+    user["live_list"].is_empty() && user["live_mission_list"].is_empty()
+}
+
+// -- lives ------------------------------------------------------------------
+
+// The account playing on a cabinet right now, None when the `arcade` flag is
+// just a flag in a request body.
+//
+// The flag decides whether the play costs LP, so it is honoured for exactly two
+// kinds of account:
+//
+//   * one of a machine's own two identities. The cabinet holds both tokens, the
+//     guest is rewritten from scratch at every credit and the machine account
+//     only ever runs the attract loop, so a free play on either buys nobody
+//     anything.
+//   * an account a card is bound to, and only while the credit that card paid
+//     for is still running: /api/arcade/session opened a window on the card row
+//     and it has not closed yet.
+//
+// A card mapping on its own proves nothing - a player can bind a card to their
+// own account from the webui account page without ever standing in front of a
+// cabinet - so an account whose card is not at a machine right now is an
+// ordinary phone account and pays LP, exactly as before.
+fn cabinet_account_at(login_token: &str, now: i64) -> Option<i64> {
+    let user_id = userdata::uid_from_login_token(login_token);
+    if user_id == 0 {
+        return None;
+    }
+    if database::machine_of_account(user_id).is_some() {
+        return Some(user_id);
+    }
+    database::live_card_session(user_id, now).map(|_| user_id)
+}
+
+// The same account rule behind the request's own opt-in flag, which /live/start
+// and /live/end carry. The flag is read first so a phone play never reaches any
+// of the arcade lookups, nor the module's own on/off switch.
+fn arcade_account_at(login_token: &str, body: &JsonValue, now: i64) -> Option<i64> {
+    if !flag(&body["arcade"]) || disabled() {
+        return None;
+    }
+    cabinet_account_at(login_token, now)
+}
+
+// The account id when this really is an arcade play, None when the live should
+// run the ordinary way.
+//
+// On top of the account rule above, /live/end has to agree with the /live/start
+// it belongs to. start_live recorded the whole start body (live.rs:331), so the
+// flag it carried is still there to read: a live that began as an ordinary play
+// ends as one however its /live/end body is flagged, and a client cannot turn a
+// finished LP-paid play into a free one after the fact.
+pub fn arcade_play_user(login_token: &str, body: &JsonValue) -> Option<i64> {
+    let user_id = arcade_account_at(login_token, body, global::timestamp() as i64)?;
+    let Some(started) = live::get_started_live(login_token, body) else {
+        println!("arcade: account {} ended an arcade live that was never started", user_id);
+        return None;
+    };
+    if !flag(&started["arcade"]) {
+        println!("arcade: account {} ended a live it started as an ordinary play", user_id);
+        return None;
+    }
+    Some(user_id)
+}
+
+// The cabinet a play is attributed to. A machine's own two accounts belong to
+// it outright; a card account belongs to nobody, so it is credited to the
+// machine that most recently ran a session for that card.
+fn play_machine(user_id: i64) -> Option<String> {
+    if let Some(machine) = database::machine_of_account(user_id) {
+        return machine["machine_id"].as_str().map(str::to_string);
+    }
+    database::last_machine_of_card_account(user_id)
+}
+
+// A live starting on a cabinet is a sighting for it: last_seen is what the TTL
+// sweeper measures, and a machine in daily use must never age out under it.
+//
+// It is also the credit saying it is still going. A song that runs long - or a
+// second song of the same credit - pushes the card's window back so the play it
+// is part of cannot expire underneath it, up to the ceiling above.
+pub fn live_started(login_token: &str, body: &JsonValue) {
+    let now = global::timestamp() as i64;
+    let Some(user_id) = arcade_account_at(login_token, body, now) else { return; };
+    if let Some(machine_id) = play_machine(user_id) {
+        database::touch_machine(&machine_id);
+    }
+    if let Some((card, opened)) = database::live_card_session(user_id, now) {
+        let ttl = session_ttl();
+        database::extend_card_session(&card, (now + ttl).min(opened + ttl * MAX_SESSION_WINDOWS));
+    }
+}
+
+// Credits already paid for the play, so use_lp is no longer what it costs - it
+// is only what every reward scales off (live.rs:781). Pinned here to one normal
+// 1x play rather than taken from the request: a cabinet that never spends LP
+// must not be able to ask for a 10x payout.
+pub fn live_end_body(body: &JsonValue) -> JsonValue {
+    let mut rv = body.clone();
+    rv["use_lp"] = multi_live::boost_lp(1).into();
+    rv
+}
+
+// The result rank the client's own result screen shows, derived from the live's
+// own thresholds - the same _scoreC/_scoreB/_scoreA/_scoreS columns the score
+// missions read (live.rs:465). 4 = S, 3 = A, 2 = B, 1 = C; 0 is below C, and is
+// also what a custom song gets, having no official thresholds.
+fn score_rank(live_id: i64, score: i64) -> i64 {
+    let live = &databases::LIVE_LIST[live_id.to_string()];
+    let mut rank = 0;
+    for (index, key) in ["scoreC", "scoreB", "scoreA", "scoreS"].iter().enumerate() {
+        if let Some(threshold) = live[*key].as_i64()
+            && threshold > 0
+            && score >= threshold {
+            rank = index as i64 + 1;
+        }
+    }
+    rank
+}
+
+// A cabinet's failed song. The retire wire carries no `arcade` flag - the
+// client's CJsonSendParamLiveRetire is master_live_id, level and live_score and
+// nothing else (Protocol.cs:7298-7305) - so the proof that this was a cabinet
+// play is the start it belongs to: start_live recorded the whole /live/start
+// body, and a cabinet's start is flagged. The account rule on top is /live/end's,
+// unchanged.
+//
+// Read before live.rs's live_retire, which sweeps the very record this reads.
+pub fn arcade_retire_user(login_token: &str, body: &JsonValue) -> Option<i64> {
+    // The start record is read before the module's on/off switch so an ordinary
+    // player's retire - whose start was never flagged - costs one lookup and
+    // nothing else, exactly as it did before the ledger learned about failures.
+    let user_id = retire_user_at(login_token, body, global::timestamp() as i64)?;
+    if disabled() {
+        return None;
+    }
+    Some(user_id)
+}
+
+fn retire_user_at(login_token: &str, body: &JsonValue, now: i64) -> Option<i64> {
+    let started = live::get_started_live(login_token, body)?;
+    if !flag(&started["arcade"]) {
+        return None;
+    }
+    cabinet_account_at(login_token, now)
+}
+
+// One row in the cabinet's ledger, and a sighting for it. Records nothing when
+// the account has no cabinet to attribute the play to - a card bound through the
+// webui that has never been to a machine still plays, it is just not anyone's
+// bookkeeping.
+//
+// `cleared` is false for a song reported at /live/retire because its life gauge
+// emptied. It is recorded whatever its play_time, unlike the global clear-rate
+// counter live.rs:30 gates at five seconds: that gate keeps a rage-quit out of a
+// public board, while a credit's song is a song of that credit either way. The
+// score is the one the retire carried, and the rank is what that score is worth
+// against the live's own thresholds - `cleared` is what tells the two apart.
+pub fn record_play(user_id: i64, body: &JsonValue, cleared: bool) {
+    let Some(machine_id) = play_machine(user_id) else { return; };
+    let live_id = body["master_live_id"].as_i64().unwrap_or(0);
+    let level = body["level"].as_i64().unwrap_or(0);
+    let score = body["live_score"]["score"].as_i64().unwrap_or(0);
+    database::insert_play(&machine_id, user_id, live_id, level, score, score_rank(live_id, score), cleared);
+    database::touch_machine(&machine_id);
+}
+
+// -- maintenance ------------------------------------------------------------
+
+// Machines unseen for --arcade-machine-ttl days, deleted with the two accounts
+// each of them owns. Run from the --purge sweep at boot.
+//
+// A card-bound player account is never touched here, and neither is a machine
+// or guest account somebody has bound a card to: cards outlive cabinets by
+// design, and the account behind one is a player's.
+pub fn purge_machines() -> usize {
+    if disabled() {
+        return 0;
+    }
+    let ttl = machine_ttl_days();
+    // 0 is "never age a cabinet out", not "age every cabinet out this second"
+    if ttl == 0 {
+        return 0;
+    }
+    purge_machines_before(global::timestamp() as i64 - (ttl as i64 * 24 * 60 * 60))
+}
+
+fn purge_machines_before(cutoff: i64) -> usize {
+    let dead = database::machines_last_seen_before(cutoff);
+    for machine in dead.members() {
+        let machine_id = machine["machine_id"].as_str().unwrap_or("");
+        println!(
+            "Removing arcade machine {} (last seen {})",
+            machine_id,
+            global::format_datetime(machine["last_seen"].as_u64().unwrap_or(0))
+        );
+        for key in ["machine_user_id", "guest_user_id"] {
+            let user_id = machine[key].as_i64().unwrap_or(0);
+            if user_id != 0 && !database::account_has_card(user_id) {
+                userdata::delete_account(user_id);
+            }
+        }
+        database::delete_machine(machine_id);
+    }
+    dead.len()
+}
+
+// -- webui ------------------------------------------------------------------
+
+// The operator's machine list: name, id, last seen and how many lives the
+// cabinet has recorded.
+pub fn webui_machines() -> JsonValue {
+    if disabled() {
+        return jzon::array![];
+    }
+    database::list_machines()
+}
+
+// Retiring a cabinet by hand: the same deletion the TTL sweeper performs, with
+// the same rule about accounts a card has claimed.
+pub fn webui_remove_machine(machine_id: &str) -> Result<(), String> {
+    if disabled() {
+        return Err(String::from("Arcade mode is disabled on this server"));
+    }
+    let Some(machine) = database::get_machine(machine_id) else {
+        return Err(format!("No arcade machine {}", machine_id));
+    };
+    for key in ["machine_user_id", "guest_user_id"] {
+        let user_id = machine[key].as_i64().unwrap_or(0);
+        if user_id != 0 && !database::account_has_card(user_id) {
+            userdata::delete_account(user_id);
+        }
+    }
+    database::delete_machine(machine_id);
+    println!("arcade: machine {} removed through the webui", machine_id);
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // The flag the client sends as 0/1 and the flag it might send as a bool are
+    // the same flag; nothing else is
+    #[test]
+    fn the_arcade_flag_reads_both_shapes() {
+        assert!(flag(&true.into()));
+        assert!(flag(&(1).into()));
+        assert!(!flag(&false.into()));
+        assert!(!flag(&(0).into()));
+        assert!(!flag(&JsonValue::Null));
+        assert!(!flag(&"yes".into()));
+    }
+
+    // A card id is refused rather than repaired
+    #[test]
+    fn card_ids_are_validated_not_sanitised() {
+        assert_eq!(card_id(&object!{ card_id: "0123456789012345" }).as_deref(), Some("0123456789012345"));
+        assert_eq!(card_id(&object!{ card_id: " 0123456789012345 " }).as_deref(), Some("0123456789012345"));
+        assert!(card_id(&object!{}).is_none());
+        assert!(card_id(&object!{ card_id: "" }).is_none());
+        assert!(card_id(&object!{ card_id: "0123-4567" }).is_none());
+        assert!(card_id(&object!{ card_id: "'; DROP TABLE cards--" }).is_none());
+        assert!(card_id(&object!{ card_id: "x".repeat(MAX_CARD_ID_LEN + 1) }).is_none());
+    }
+
+    // The account a fresh card gets is named after the card
+    #[test]
+    fn a_new_card_is_named_after_its_last_four_digits() {
+        assert_eq!(card_account_name("0123456789012345"), "2345");
+        assert_eq!(card_account_name("12"), "12");
+    }
+
+    // The rank stored in the ledger is the one the result screen shows, read off
+    // the live's own masterdata thresholds (live.csv 1100101: C 20000, B 100000,
+    // A 250000, S 350000)
+    #[test]
+    fn the_ledger_rank_comes_from_the_lives_own_thresholds() {
+        assert_eq!(score_rank(1100101, 0), 0);
+        assert_eq!(score_rank(1100101, 19_999), 0);
+        assert_eq!(score_rank(1100101, 20_000), 1);
+        assert_eq!(score_rank(1100101, 100_000), 2);
+        assert_eq!(score_rank(1100101, 250_000), 3);
+        assert_eq!(score_rank(1100101, 350_000), 4);
+        assert_eq!(score_rank(1100101, 9_999_999), 4);
+        // A custom song has no official row, so it has no rank
+        assert_eq!(score_rank(10_000, 9_999_999), 0);
+    }
+
+    // The card-rebind cleanup only ever takes an account that is provably a
+    // throwaway: a real player's account survives losing its card
+    #[test]
+    fn only_an_untouched_throwaway_follows_its_card() {
+        let _lock = crate::runtime::lock_test_data_path();
+
+        // Never played, no card, no password, not a cabinet: a throwaway
+        let (orphan, _) = userdata::starter::create("2345").unwrap();
+        assert!(orphan_of_a_rebound_card(orphan));
+
+        // Somebody played on it
+        let (played, played_token) = userdata::starter::create("2346").unwrap();
+        let mut user = userdata::get_acc_from_uid(played);
+        user["live_list"].push(object!{ master_live_id: 1100101, level: 4, clear_count: 1, high_score: 1, max_combo: 1 }).unwrap();
+        userdata::save_acc(&played_token, user);
+        assert!(!orphan_of_a_rebound_card(played));
+
+        // Somebody can take it over from a phone
+        let (phone, _) = userdata::starter::create("2347").unwrap();
+        userdata::user::migration::save_acc_transfer(phone, "hunter2");
+        assert!(!orphan_of_a_rebound_card(phone));
+
+        // Another card still points at it
+        let (shared, _) = userdata::starter::create("2348").unwrap();
+        crate::database::arcade::set_card("9999888877776666", shared);
+        assert!(!orphan_of_a_rebound_card(shared));
+
+        // It is a cabinet's own identity
+        let (machine_account, _) = userdata::starter::create("Cabinet").unwrap();
+        let (guest_account, _) = userdata::starter::create(GUEST_NAME).unwrap();
+        let machine_id = crate::database::arcade::generate_machine_id();
+        crate::database::arcade::insert_machine(&machine_id, "Cabinet", machine_account, guest_account);
+        assert!(!orphan_of_a_rebound_card(machine_account));
+        assert!(!orphan_of_a_rebound_card(guest_account));
+
+        // An account that no longer exists is not deleted twice
+        userdata::delete_account(orphan);
+        assert!(!orphan_of_a_rebound_card(orphan));
+
+        crate::database::arcade::delete_machine(&machine_id);
+    }
+
+    // A cabinet's song that ended with an empty life gauge is reported at
+    // /live/retire, which carries no arcade flag - the start record is what
+    // proves it was a cabinet's - and it lands in the ledger as a failed song
+    // rather than not at all.
+    #[test]
+    fn a_failed_cabinet_song_lands_in_the_ledger_uncleared() {
+        let _lock = crate::runtime::lock_test_data_path();
+        use crate::database::arcade as db;
+
+        let (machine_account, _) = userdata::starter::create("Cabinet Retire").unwrap();
+        let (guest_account, guest_token) = userdata::starter::create(GUEST_NAME).unwrap();
+        let machine_id = db::generate_machine_id();
+        db::insert_machine(&machine_id, "Cabinet Retire", machine_account, guest_account);
+
+        // The credit's song: /live/start carried the flag, so the record does
+        let start = object!{
+            master_live_id: 1100101,
+            level: 4,
+            deck_slot: 1,
+            live_boost: 1,
+            arcade: true
+        };
+        live::start_live(&guest_token, &start);
+
+        // The life gauge emptied: the client played it out and reported the score
+        // it reached at /live/retire, which has no arcade flag of its own
+        let retire = object!{
+            master_live_id: 1100101,
+            level: 4,
+            live_score: { score: 123_456, max_combo: 40, play_time: 93 }
+        };
+        let now = global::timestamp() as i64;
+        let user_id = retire_user_at(&guest_token, &retire, now).expect("a cabinet's retire was not recognised");
+        assert_eq!(user_id, guest_account);
+        record_play(user_id, &retire, false);
+
+        let ledger = db::plays_of_machine(&machine_id);
+        assert_eq!(ledger.len(), 1);
+        assert_eq!(ledger[0]["cleared"].as_bool(), Some(false));
+        assert_eq!(ledger[0]["user_id"].as_i64(), Some(guest_account));
+        assert_eq!(ledger[0]["live_id"].as_i64(), Some(1100101));
+        assert_eq!(ledger[0]["level"].as_i64(), Some(4));
+        assert_eq!(ledger[0]["score"].as_i64(), Some(123_456), "the retire's own score was not carried");
+        // It counts as a song of the credit, and only the cleared count excludes it
+        assert!(db::list_machines().members().any(|m|
+            m["machine_id"] == machine_id.as_str() && m["play_count"] == 1 && m["cleared_count"] == 0
+        ));
+
+        // A live that was started as an ordinary play is not a cabinet's song,
+        // however the retire that ends it looks
+        live::start_live(&guest_token, &object!{ master_live_id: 1100102, level: 4, deck_slot: 1 });
+        assert!(retire_user_at(&guest_token, &object!{
+            master_live_id: 1100102,
+            level: 4,
+            live_score: { score: 1, max_combo: 1, play_time: 93 }
+        }, now).is_none(), "an unflagged start was bookkept as a cabinet's song");
+
+        // Neither is a retire with no start behind it at all
+        assert!(retire_user_at(&guest_token, &object!{
+            master_live_id: 1100103,
+            level: 4,
+            live_score: { score: 1, max_combo: 1, play_time: 93 }
+        }, now).is_none());
+
+        db::delete_machine(&machine_id);
+        userdata::delete_account(machine_account);
+        userdata::delete_account(guest_account);
+    }
+
+    // A cabinet that aged out takes its two accounts with it - and nothing
+    // else. A cabinet still in use, and any account a player bound a card to,
+    // survives the sweep.
+    #[test]
+    fn an_aged_out_cabinet_takes_only_its_own_accounts() {
+        let _lock = crate::runtime::lock_test_data_path();
+        use crate::database::arcade as db;
+
+        // Old: unseen since before the cutoff
+        let (old_machine, old_machine_token) = userdata::starter::create("Old cabinet").unwrap();
+        let (old_guest, old_guest_token) = userdata::starter::create(GUEST_NAME).unwrap();
+        let old_id = db::generate_machine_id();
+        db::insert_machine(&old_id, "Old cabinet", old_machine, old_guest);
+
+        // Live: seen just now
+        let (live_machine, live_machine_token) = userdata::starter::create("Live cabinet").unwrap();
+        let (live_guest, _) = userdata::starter::create(GUEST_NAME).unwrap();
+        let live_id = db::generate_machine_id();
+        db::insert_machine(&live_id, "Live cabinet", live_machine, live_guest);
+
+        // Old too, but somebody bound a card to its machine account
+        let (claimed_machine, claimed_machine_token) = userdata::starter::create("Claimed cabinet").unwrap();
+        let (claimed_guest, _) = userdata::starter::create(GUEST_NAME).unwrap();
+        let claimed_id = db::generate_machine_id();
+        db::insert_machine(&claimed_id, "Claimed cabinet", claimed_machine, claimed_guest);
+        db::set_card("4444333322221111", claimed_machine);
+
+        // A player account with a card, belonging to no cabinet at all
+        let (player, player_token) = userdata::starter::create("Player").unwrap();
+        db::set_card("8888777766665555", player);
+
+        // Everything registered above is "seen now"; only the two we push back
+        // are older than the cutoff
+        let now = global::timestamp() as i64;
+        for id in [&old_id, &claimed_id] {
+            db::backdate_machine_for_test(id, now - 1000);
+        }
+
+        assert_eq!(purge_machines_before(now - 500), 2);
+
+        // The aged-out cabinet is gone, accounts and all
+        assert!(db::get_machine(&old_id).is_none());
+        assert_eq!(userdata::uid_from_login_token(&old_machine_token), 0);
+        assert_eq!(userdata::uid_from_login_token(&old_guest_token), 0);
+
+        // The cabinet still in use is untouched
+        assert!(db::get_machine(&live_id).is_some());
+        assert_eq!(userdata::uid_from_login_token(&live_machine_token), live_machine);
+
+        // The claimed cabinet is retired, but the account behind its card is not
+        assert!(db::get_machine(&claimed_id).is_none());
+        assert_eq!(userdata::uid_from_login_token(&claimed_machine_token), claimed_machine);
+        assert_eq!(db::card_user("4444333322221111"), Some(claimed_machine));
+
+        // A card-bound player account is never a candidate in the first place
+        assert_eq!(userdata::uid_from_login_token(&player_token), player);
+
+        db::delete_machine(&live_id);
+    }
+
+    // A card the server has never seen gets an account named after its own last
+    // four digits, and the name the player then types at the cabinet lands on
+    // that account - and on nothing else. The rename is a second /session for
+    // the same card, so every other account has to be immune to it.
+    #[test]
+    fn a_new_cards_account_takes_the_name_the_player_types() {
+        let _lock = crate::runtime::lock_test_data_path();
+        use crate::database::arcade as db;
+
+        const TTL: i64 = 30 * 60;
+        let now = global::timestamp() as i64;
+        let card = "6060606060602345";
+        let machine_id = db::generate_machine_id();
+
+        // /api/arcade/session, first call: an unknown card, so the account is
+        // created under the card's last four digits and the credit's window opens
+        let name = card_account_name(card);
+        assert_eq!(name, "2345");
+        let (user_id, token) = userdata::starter::create(&name).unwrap();
+        db::set_card(card, user_id);
+        db::open_card_session(card, &machine_id, now + TTL);
+
+        // ...and the same call again, carrying the name the player typed
+        assert!(issued_by_this_credit(card, user_id, now, TTL));
+        rename_account(user_id, &token, "Ethan");
+        assert_eq!(userdata::get_name_and_rank(user_id)["user_name"].as_str(), Some("Ethan"));
+
+        // Once named it is somebody's account: a second name entry on the same
+        // card cannot touch it
+        assert!(!issued_by_this_credit(card, user_id, now, TTL), "a named account was still renameable");
+
+        // Neither can one whose credit has ended - the window is the proof
+        let later_card = "6060606060601111";
+        let (later, _) = userdata::starter::create(&card_account_name(later_card)).unwrap();
+        db::set_card(later_card, later);
+        db::open_card_session(later_card, &machine_id, now + TTL);
+        db::backdate_card_session_for_test(later_card, now - TTL - 1, now + TTL);
+        assert!(!issued_by_this_credit(later_card, later, now, TTL), "an old credit could still rename");
+        db::backdate_card_session_for_test(later_card, now, now - 1);
+        assert!(!issued_by_this_credit(later_card, later, now, TTL), "a closed window could still rename");
+
+        // Nor a card presented at one cabinet renaming through another card's row
+        db::open_card_session(later_card, &machine_id, now + TTL);
+        assert!(!issued_by_this_credit(card, later, now, TTL), "a different card's id could rename");
+
+        // A phone account behind a card is never renameable, however fresh its
+        // window is: it has a transfer password, and its name is its own
+        let phone_card = "6060606060602222";
+        let (phone, _) = userdata::starter::create(&card_account_name(phone_card)).unwrap();
+        userdata::user::migration::save_acc_transfer(phone, "hunter2");
+        db::set_card(phone_card, phone);
+        db::open_card_session(phone_card, &machine_id, now + TTL);
+        assert!(!issued_by_this_credit(phone_card, phone, now, TTL), "a phone account was renameable");
+
+        // And neither is an account that has already played something
+        let played_card = "6060606060603333";
+        let (played, played_token) = userdata::starter::create(&card_account_name(played_card)).unwrap();
+        db::set_card(played_card, played);
+        db::open_card_session(played_card, &machine_id, now + TTL);
+        assert!(issued_by_this_credit(played_card, played, now, TTL));
+        let mut user = userdata::get_acc_from_uid(played);
+        user["live_list"].push(object!{ master_live_id: 1100101, level: 4, clear_count: 1, high_score: 1, max_combo: 1 }).unwrap();
+        userdata::save_acc(&played_token, user);
+        assert!(!issued_by_this_credit(played_card, played, now, TTL), "a played account was renameable");
+
+        // Finally: a cabinet's own identity, which a card may not name at all
+        let (machine_account, _) = userdata::starter::create("Cabinet Name").unwrap();
+        let (guest_account, _) = userdata::starter::create(GUEST_NAME).unwrap();
+        db::insert_machine(&machine_id, "Cabinet Name", machine_account, guest_account);
+        let cabinet_card = "6060606060604444";
+        db::set_card(cabinet_card, guest_account);
+        db::open_card_session(cabinet_card, &machine_id, now + TTL);
+        assert!(!issued_by_this_credit(cabinet_card, guest_account, now, TTL), "a cabinet identity was renameable");
+
+        db::delete_machine(&machine_id);
+        for id in [user_id, later, phone, played, machine_account, guest_account] {
+            userdata::delete_account(id);
+        }
+    }
+}

src/router/chat.rs

@@ -7,11 +7,33 @@ pub fn routes(cfg: &mut web::ServiceConfig) {
     cfg.service(
         web::scope("/chat")
             .route("/home", web::post().to(home))
+            .route("/talk/get_stamp", web::get().to(get_stamp))
             .route("/talk/start", web::post().to(start))
             .route("/talk/end", web::post().to(end))
     );
 }
 
+// The stamps this account owns. ew does not track stamp unlocks, so everyone has the
+// masterdata initial set — the same list /chat/home reports, deliberately from one
+// source so the two endpoints can never disagree.
+fn owned_stamp_ids() -> JsonValue {
+    databases::INITIAL_CHAT_STAMPS.clone()
+}
+
+// GET /api/chat/talk/get_stamp (Protocol.send_get_stamp, FuncId.GET_STAMP).
+// RecvGetStampRData carries a single `master_chat_stamp_ids` array, which its Notify()
+// feeds to CallOnUpdateChatStampListNotify — the same sink RecvChatHomeRData uses, so
+// the stamp picker ends up with whatever this returns. The client sends no parameters.
+//
+// This endpoint appears in neither official capture (0 hits across the 288MB JP and
+// 1.4GB EN logs), so the shape is taken from the client class and the contents from the
+// /chat/home captures that do exist and carry the same field.
+async fn get_stamp(Login(_key): Login) -> impl Responder {
+    Api(Some(object!{
+        "master_chat_stamp_ids": owned_stamp_ids()
+    }))
+}
+
 pub fn add_chat(id: i64, num: i64, chats: &mut JsonValue) -> bool {
     for data in chats.members() {
         if data["chat_id"] == id && data["room_id"] == num {
@@ -48,7 +70,7 @@ async fn home(Login(key): Login) -> impl Responder {
     Api(Some(object!{
         "progress_list": chats,
         "master_chat_room_ids": rooms,
-        "master_chat_stamp_ids": [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,43,44,45,46,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,11001003,22001001,33001001,44001002],
+        "master_chat_stamp_ids": owned_stamp_ids(),
         "master_chat_attachment_ids": []
     }))
 }
@@ -75,3 +97,41 @@ async fn end(Session { key, body }: Session) -> impl Responder {
     
     Api(Some(array![]))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // Verbatim from an official /api/chat/home capture (JP log, the 65-occurrence
+    // baseline seen on accounts that had earned no extra stamps yet). Both the JP and EN
+    // chat_stamp tables reproduce it exactly from _initialStamp, which is what lets
+    // get_stamp serve masterdata instead of a hardcoded literal.
+    const OFFICIAL_INITIAL_STAMPS: [i64; 97] = [
+        1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19,20,21,22,23,24,25,26,27,28,29,30,
+        31,32,33,34,35,36,37,38,39,40,41,43,44,45,46,48,49,50,51,52,53,54,55,56,57,58,
+        59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,
+        85,86,87,88,89,90,91,92,93,94,95,96,11001003,22001001,33001001,44001002
+    ];
+
+    #[test]
+    fn the_initial_stamp_set_matches_official() {
+        let ids: Vec<i64> = owned_stamp_ids().members().map(|s| s.as_i64().unwrap()).collect();
+        assert_eq!(ids, OFFICIAL_INITIAL_STAMPS.to_vec());
+        // Order matters: the official list is masterdata order, not sorted (the 11xxxxxx
+        // band trails the small ids).
+        assert_eq!(ids.first(), Some(&1));
+        assert_eq!(ids.last(), Some(&44001002));
+        // The gaps are real - 18, 42 and 47 are not initial stamps.
+        for missing in [18, 42, 47] {
+            assert!(!ids.contains(&missing), "{missing} should not be an initial stamp");
+        }
+    }
+
+    #[test]
+    fn get_stamp_and_chat_home_cannot_disagree() {
+        // Both endpoints read the one source; this is what stops /chat/home's list and
+        // the stamp picker's list from drifting apart.
+        assert_eq!(owned_stamp_ids(), *databases::INITIAL_CHAT_STAMPS);
+        assert!(!owned_stamp_ids().is_empty());
+    }
+}

src/router/clear_rate.rs

@@ -68,14 +68,14 @@ fn setup_tables(conn: &rusqlite::Connection) {
     );").unwrap();
 }
 
-fn update_live_score(id: i64, uid: i64, score: i64) {
-    if uid == 0 || score == 0 {
-        return;
-    }
-    
-    let info = DATABASE.lock_and_select("SELECT score_data FROM scores WHERE live_id=?1", params!(id)).unwrap_or(String::from("[]"));
-    let scores = jzon::parse(&info).unwrap();
-    
+// Merges this play into the song's top-10 board. Pure so the whole read-modify-write can
+// sit inside one transaction, and so the keep-best rule is testable on its own.
+//
+// The board is per-song, not per-account: `scores` is keyed by live_id alone and the user
+// lives inside the JSON blob. A user already on the board keeps whichever of their two
+// scores is higher — a replay that does not beat the stored one is dropped (`None`), which
+// is what makes a repeated or duplicated end idempotent rather than additive.
+fn merge_live_score(scores: &JsonValue, uid: i64, score: i64) -> Option<JsonValue> {
     let mut result = array![];
     let mut current = 0;
     let mut added = false;
@@ -99,7 +99,8 @@ fn update_live_score(id: i64, uid: i64, score: i64) {
             }
         }
         if scores[i]["user"].as_i64().unwrap() == uid && !added {
-            return;
+            // Already on the board with a better score — keep it, drop this play.
+            return None;
         }
         if scores[i]["user"].as_i64().unwrap() == uid {
             continue;
@@ -107,13 +108,41 @@ fn update_live_score(id: i64, uid: i64, score: i64) {
         result.push(scores[i].clone()).unwrap();
         current += 1;
     }
-    
-    if added {
-        if DATABASE.lock_and_select("SELECT live_id FROM scores WHERE live_id=?1", params!(id)).is_ok() {
-            DATABASE.lock_and_exec("UPDATE scores SET score_data=?1 WHERE live_id=?2", params!(jzon::stringify(result), id));
-        } else {
-            DATABASE.lock_and_exec("INSERT INTO scores (score_data, live_id) VALUES (?1, ?2)", params!(jzon::stringify(result), id));
-        }
+
+    if added { Some(result) } else { None }
+}
+
+fn update_live_score(id: i64, uid: i64, score: i64) {
+    if uid == 0 || score == 0 {
+        return;
+    }
+
+    // One transaction for read + merge + write. Previously this SELECTed to choose between
+    // UPDATE and INSERT on separate connections, so two ends landing together for a song
+    // with no row yet both took the INSERT branch and the loser panicked the worker on
+    // `UNIQUE constraint failed: scores.live_id`. Two clients finishing the same multi
+    // live make that the normal case, not a rare race.
+    let write = DATABASE.lock_and_transact(|conn| {
+        let stored: String = conn
+            .query_row("SELECT score_data FROM scores WHERE live_id=?1", params!(id), |row| row.get(0))
+            .unwrap_or_else(|_| String::from("[]"));
+        let scores = jzon::parse(&stored).unwrap_or_else(|_| array![]);
+
+        let Some(result) = merge_live_score(&scores, uid, score) else {
+            return Ok(());
+        };
+
+        // Atomic upsert: no branch left for a concurrent writer to slip between.
+        conn.execute(
+            "INSERT INTO scores (live_id, score_data) VALUES (?1, ?2)
+             ON CONFLICT(live_id) DO UPDATE SET score_data=excluded.score_data",
+            params!(id, jzon::stringify(result))
+        )?;
+        Ok(())
+    });
+
+    if let Err(e) = write {
+        println!("Failed to record score for live {id}: {e}");
     }
 }
 
@@ -129,27 +158,44 @@ pub fn invalidate_cache() {
     crate::lock_onto_mutex!(CACHED_HTML_DATA).take();
 }
 
+// The clear-rate counter column this play lands in, or None for a level outside 1-4.
+// Names come from this closed set, never from request data, so it is safe to interpolate.
+fn clear_rate_column(level: i32, failed: bool) -> Option<&'static str> {
+    let tier = match level {
+        1 => "normal",
+        2 => "hard",
+        3 => "expert",
+        4 => "master",
+        _ => return None
+    };
+    Some(match (tier, failed) {
+        ("normal", true) => "normal_failed",   ("normal", false) => "normal_pass",
+        ("hard", true) => "hard_failed",       ("hard", false) => "hard_pass",
+        ("expert", true) => "expert_failed",   ("expert", false) => "expert_pass",
+        (_, true) => "master_failed",          (_, false) => "master_pass"
+    })
+}
+
 pub fn live_completed(id: i64, level: i32, failed: bool, score: i64, uid: i64) {
     update_live_score(id, uid, score);
-    match DATABASE.get_live_data(id) {
-        Ok(info) => {
-            let value = format!("{}_{}", 
-                if 1 == level { "normal" } else if 2 == level { "hard" } else if 3 == level { "expert" } else { "master" },
-                if failed { "failed" } else { "pass" }
-            );
-            let new_info = if 1 == level && failed { info.normal_failed }
-                           else if 1 == level && !failed { info.normal_pass }
-                           else if 2 == level && failed { info.hard_failed }
-                           else if 2 == level && !failed { info.hard_pass }
-                           else if 3 == level && failed { info.expert_failed }
-                           else if 3 == level && !failed { info.expert_pass }
-                           else if 4 == level && failed { info.master_failed }
-                           else if 4 == level && !failed { info.master_pass } else { return; };
-            
-            DATABASE.lock_and_exec(&format!("UPDATE lives SET {}=?1 WHERE live_id=?2", value), params!(new_info + 1, info.live_id));
-        },
-        Err(_) => {
-            DATABASE.lock_and_exec("INSERT INTO lives (live_id, normal_failed, normal_pass, hard_failed, hard_pass, expert_failed, expert_pass, master_failed, master_pass) VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)", params!(
+
+    let Some(column) = clear_rate_column(level, failed) else {
+        return;
+    };
+
+    // `lives` is keyed by live_id alone and had the same select-then-INSERT-or-UPDATE
+    // split as `scores`, so it could panic the same way on a first-ever concurrent play
+    // (and lost counts whenever two plays overlapped). One upsert does both branches
+    // atomically and increments in SQL rather than read-modify-write in Rust.
+    let write = DATABASE.lock_and_transact(|conn| {
+        conn.execute(
+            &format!(
+                "INSERT INTO lives (live_id, normal_failed, normal_pass, hard_failed, hard_pass,
+                                    expert_failed, expert_pass, master_failed, master_pass)
+                 VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)
+                 ON CONFLICT(live_id) DO UPDATE SET {column} = {column} + 1"
+            ),
+            params!(
                 id,
                 if 1 == level && failed { 1 } else { 0 },
                 if 1 == level && !failed { 1 } else { 0 },
@@ -159,9 +205,14 @@ pub fn live_completed(id: i64, level: i32, failed: bool, score: i64, uid: i64) {
                 if 3 == level && !failed { 1 } else { 0 },
                 if 4 == level && failed { 1 } else { 0 },
                 if 4 == level && !failed { 1 } else { 0 }
-            ));
-        },
-    };
+            )
+        )?;
+        Ok(())
+    });
+
+    if let Err(e) = write {
+        println!("Failed to record clear rate for live {id}: {e}");
+    }
 }
 
 fn get_song_title(live_id: i32, english: bool) -> String {
@@ -407,3 +458,107 @@ pub async fn clearrate_html(_req: HttpRequest) -> HttpResponse {
         .content_type(ContentType::html())
         .body(html)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn board(live_id: i64) -> JsonValue {
+        let stored = DATABASE
+            .lock_and_select("SELECT score_data FROM scores WHERE live_id=?1", params!(live_id))
+            .unwrap_or_else(|_| String::from("[]"));
+        jzon::parse(&stored).unwrap()
+    }
+
+    fn passes(live_id: i64) -> i64 {
+        DATABASE.get_live_data(live_id).map(|l| l.master_pass).unwrap_or(0)
+    }
+
+    #[test]
+    fn merge_keeps_the_users_best_score() {
+        let existing = array![object!{user: 7, score: 900}];
+
+        // A better score replaces the stored one rather than adding a second entry.
+        let better = merge_live_score(&existing, 7, 1000).expect("a better score is recorded");
+        assert_eq!(better.len(), 1);
+        assert_eq!(better[0]["score"].as_i64(), Some(1000));
+
+        // A worse or equal replay is dropped entirely — this is what makes a repeated
+        // end idempotent instead of appending the same user twice.
+        assert!(merge_live_score(&existing, 7, 800).is_none());
+        assert!(merge_live_score(&existing, 7, 900).is_none());
+
+        // A different user is ranked against the board, best first.
+        let other = merge_live_score(&existing, 8, 950).expect("a new user is recorded");
+        assert_eq!(other.len(), 2);
+        assert_eq!(other[0]["user"].as_i64(), Some(8));
+        assert_eq!(other[1]["user"].as_i64(), Some(7));
+    }
+
+    #[test]
+    fn a_duplicate_end_does_not_double_the_board_entry() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let live_id = 990001;
+
+        live_completed(live_id, 4, false, 500000, 4242);
+        assert_eq!(board(live_id).len(), 1);
+        assert_eq!(passes(live_id), 1);
+
+        // The second end for the same session: same user, same score. The board must not
+        // grow, and this must not raise UNIQUE constraint failed: scores.live_id.
+        live_completed(live_id, 4, false, 500000, 4242);
+        assert_eq!(board(live_id).len(), 1, "the same user must not appear twice");
+        assert_eq!(board(live_id)[0]["score"].as_i64(), Some(500000));
+    }
+
+    // The actual regression: two ends for a song with no row yet, landing together. Both
+    // used to take the INSERT branch and the loser unwrapped a ConstraintViolation into a
+    // worker panic. Two clients finishing one multi live makes this the normal case.
+    #[test]
+    fn concurrent_first_plays_of_one_song_do_not_collide() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let live_id = 990002;
+
+        std::thread::scope(|s| {
+            for uid in [101i64, 102, 103, 104, 105, 106, 107, 108] {
+                s.spawn(move || live_completed(live_id, 4, false, 400000 + uid, uid));
+            }
+        });
+
+        // Every writer landed: no row lost to a race, none lost to a swallowed error.
+        assert_eq!(board(live_id).len(), 8);
+        assert_eq!(passes(live_id), 8, "clear-rate counts must not be lost either");
+    }
+
+    // The other half of /multi_live/end's score-board branch (the account's own high score
+    // is pinned in live.rs): a public multi live reaches live_completed with uid 0, so the
+    // play is counted and the board is left alone. /live/retire has always used the same
+    // signal for a failed live.
+    #[test]
+    fn a_play_with_no_user_counts_the_clear_but_not_the_board() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let live_id = 990003;
+
+        live_completed(live_id, 4, false, 500000, 0);
+        assert_eq!(board(live_id).len(), 0, "an unranked play must not reach the board");
+        assert_eq!(passes(live_id), 1, "but it is still a play of the song");
+
+        // The same score from a real account does land, which is the private-room path.
+        live_completed(live_id, 4, false, 500000, 4243);
+        assert_eq!(board(live_id).len(), 1);
+        assert_eq!(passes(live_id), 2);
+    }
+
+    #[test]
+    fn clear_rate_columns_cover_every_level() {
+        assert_eq!(clear_rate_column(1, false), Some("normal_pass"));
+        assert_eq!(clear_rate_column(1, true), Some("normal_failed"));
+        assert_eq!(clear_rate_column(2, false), Some("hard_pass"));
+        assert_eq!(clear_rate_column(3, true), Some("expert_failed"));
+        assert_eq!(clear_rate_column(4, false), Some("master_pass"));
+        assert_eq!(clear_rate_column(4, true), Some("master_failed"));
+        // Level 0 (a skip ticket's "any level") writes no counter, as before.
+        assert_eq!(clear_rate_column(0, false), None);
+        assert_eq!(clear_rate_column(5, false), None);
+    }
+}

src/router/custom_3dmv/package.rs

@@ -0,0 +1,88 @@
+use std::collections::HashMap;
+use std::fs;
+use std::io::{Cursor, Read, Seek, Write};
+use zip::write::SimpleFileOptions;
+
+use super::{blob_path, field_key};
+use crate::database::custom_3dmv as database;
+
+// Export packages carry the stored blobs byte-for-byte (they ARE the original
+// uploads - nothing is transcoded) plus the upload metadata, so an MV can be
+// re-uploaded on any ew server. Layout of the zip:
+//   manifest.json   {format, name, name_en, music_id, member_count}
+//   model_{slot} / motion_{slot} / facial_{slot} / camera / config / stage
+// published is a per-server setting and deliberately not part of the package.
+
+pub fn build(mv_id: i64) -> Result<Vec<u8>, String> {
+    let mv = database::get_mv(mv_id).ok_or(String::from("MV not found"))?;
+
+    let manifest = jzon::object!{
+        "format": 1,
+        "name": mv["name"].clone(),
+        "name_en": mv["name_en"].clone(),
+        "music_id": mv["music_id"].clone(),
+        "member_count": mv["member_count"].clone()
+    };
+
+    let mut zip = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let options = SimpleFileOptions::default();
+    let mut add = |name: &str, bytes: &[u8]| -> Result<(), String> {
+        zip.start_file(name, options).map_err(|e| e.to_string())?;
+        zip.write_all(bytes).map_err(|e| e.to_string())
+    };
+
+    add("manifest.json", jzon::stringify(manifest).as_bytes())?;
+    for file in mv["files"].members() {
+        let Some(name) = field_key(file) else { continue; };
+        let md5 = file["md5"].as_str().unwrap_or("");
+        let bytes = fs::read(blob_path(md5)).map_err(|e| e.to_string())?;
+        add(&name, &bytes)?;
+    }
+
+    Ok(zip.finish().map_err(|e| e.to_string())?.into_inner())
+}
+
+fn read_entry<R: Read + Seek>(archive: &mut zip::ZipArchive<R>, name: &str) -> Option<Vec<u8>> {
+    let mut file = archive.by_name(name).ok()?;
+    let mut bytes = Vec::new();
+    file.read_to_end(&mut bytes).ok()?;
+    Some(bytes)
+}
+
+// Expands a package into the same field map the upload form produces. The
+// package's metadata wins over form fields - except music_id, which is a
+// server-local id: a form-supplied song wins, and the manifest's only fills
+// in when the form left it blank (same-server re-upload)
+pub fn expand(package: &[u8], fields: &mut HashMap<String, Vec<u8>>) -> Result<(), String> {
+    let mut archive = zip::ZipArchive::new(Cursor::new(package)).map_err(|_| String::from("Package is not a valid zip file"))?;
+
+    let manifest = read_entry(&mut archive, "manifest.json").ok_or(String::from("Package has no manifest.json"))?;
+    let manifest = jzon::parse(&String::from_utf8_lossy(&manifest)).map_err(|_| String::from("Package manifest is not valid JSON"))?;
+    if manifest["format"].as_i64() != Some(1) {
+        return Err(String::from("Unsupported package format"));
+    }
+
+    for key in ["name", "name_en", "member_count"] {
+        if !manifest[key].is_null() {
+            fields.insert(key.to_string(), manifest[key].to_string().into_bytes());
+        }
+    }
+    if !fields.get("music_id").is_some_and(|v| !v.is_empty()) && !manifest["music_id"].is_null() {
+        fields.insert(String::from("music_id"), manifest["music_id"].to_string().into_bytes());
+    }
+
+    let member_count = manifest["member_count"].as_i64().unwrap_or(0);
+    for slot in 1..=member_count.clamp(0, super::MAX_MEMBER_COUNT) {
+        for role in ["model", "motion", "facial"] {
+            if let Some(bytes) = read_entry(&mut archive, &format!("{}_{}", role, slot)) {
+                fields.insert(format!("{}_{}", role, slot), bytes);
+            }
+        }
+    }
+    for name in ["camera", "config", "stage"] {
+        if let Some(bytes) = read_entry(&mut archive, name) {
+            fields.insert(String::from(name), bytes);
+        }
+    }
+    Ok(())
+}

src/router/custom_3dmv/vmd.rs

@@ -0,0 +1,121 @@
+// Structural validation of a VMD (Vocaloid Motion Data) upload: the header
+// magic plus a full section walk with bounds checks, so a truncated or
+// corrupt file is rejected cheaply at upload time instead of crashing a
+// client mid-live. Nothing here decodes the animation - the stored bytes are
+// served verbatim and the client owns the semantics.
+//
+// Layout (little-endian): 30-byte magic "Vocaloid Motion Data 0002"
+// (NUL-padded), 20-byte model name, then up to 6 sections, each a uint32
+// count followed by fixed-size records - bone (111), morph (23), camera (61),
+// light (28), self-shadow (9) - and the property/IK section whose records are
+// variable-sized (9 bytes + 21 per IK entry). Camera-only and motion-only
+// files legitimately end early: EOF on a section boundary reads as count 0.
+
+const MAGIC_V2: &[u8] = b"Vocaloid Motion Data 0002";
+const MAGIC_V1: &[u8] = b"Vocaloid Motion Data file";
+const HEADER_LEN: usize = 30 + 20;
+
+// (record size, section name) for the fixed-size sections, in file order
+const FIXED_SECTIONS: &[(usize, &str)] = &[
+    (111, "bone"),
+    (23, "morph"),
+    (61, "camera"),
+    (28, "light"),
+    (9, "self-shadow")
+];
+
+fn read_count(bytes: &[u8], offset: usize) -> Option<u32> {
+    let end = offset.checked_add(4)?;
+    Some(u32::from_le_bytes(bytes.get(offset..end)?.try_into().unwrap()))
+}
+
+pub fn validate(label: &str, bytes: &[u8]) -> Result<(), String> {
+    if bytes.len() < HEADER_LEN {
+        return Err(format!("'{}' is too short to be a VMD file", label));
+    }
+    if bytes.starts_with(MAGIC_V1) {
+        return Err(format!("'{}' is a version 1 VMD (\"Vocaloid Motion Data file\") - re-save it as version 2 in MMD", label));
+    }
+    if !bytes.starts_with(MAGIC_V2) {
+        return Err(format!("'{}' is not a VMD file (missing the \"Vocaloid Motion Data 0002\" header)", label));
+    }
+
+    let mut offset = HEADER_LEN;
+    for (record_size, section) in FIXED_SECTIONS {
+        // EOF exactly on a section boundary: the remaining sections are absent
+        if offset == bytes.len() {
+            return Ok(());
+        }
+        let Some(count) = read_count(bytes, offset) else {
+            return Err(format!("'{}' is truncated in the {} section header", label, section));
+        };
+        offset += 4;
+        let section_len = (count as usize).checked_mul(*record_size)
+            .filter(|len| offset.checked_add(*len).is_some_and(|end| end <= bytes.len()))
+            .ok_or(format!("'{}' is truncated: the {} section claims {} records past the end of the file", label, section, count))?;
+        offset += section_len;
+    }
+
+    // Property/IK section: uint32 frame, byte visible, uint32 ikCount, then
+    // ikCount x (20-byte bone name + 1-byte enabled)
+    if offset == bytes.len() {
+        return Ok(());
+    }
+    let Some(count) = read_count(bytes, offset) else {
+        return Err(format!("'{}' is truncated in the property section header", label));
+    };
+    offset += 4;
+    for _ in 0..count {
+        let Some(ik_count) = read_count(bytes, offset + 5) else {
+            return Err(format!("'{}' is truncated in the property section", label));
+        };
+        let record_len = (ik_count as usize).checked_mul(21)
+            .and_then(|len| len.checked_add(9))
+            .filter(|len| offset.checked_add(*len).is_some_and(|end| end <= bytes.len()))
+            .ok_or(format!("'{}' is truncated in the property section", label))?;
+        offset += record_len;
+    }
+    // Trailing bytes after the last section are tolerated, like MMD does
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn structure_walk_accepts_real_shapes_and_rejects_corruption() {
+        let vmd = crate::router::custom_3dmv::tests::test_vmd(1);
+        assert!(validate("motion_1", &vmd).is_ok());
+
+        // Camera-only file: sections end after camera
+        let cam = crate::router::custom_3dmv::tests::test_camera_vmd(2);
+        assert!(validate("camera", &cam).is_ok());
+
+        // A bare header with every section absent is structurally fine
+        let mut bare = Vec::new();
+        bare.extend(MAGIC_V2);
+        bare.resize(HEADER_LEN, 0);
+        assert!(validate("motion_1", &bare).is_ok());
+
+        // Truncations and lies
+        assert!(validate("motion_1", &vmd[..vmd.len() - 1]).unwrap_err().contains("truncated"));
+        assert!(validate("motion_1", &vmd[..HEADER_LEN + 2]).unwrap_err().contains("truncated"));
+        let mut liar = vmd.clone();
+        liar[HEADER_LEN] = 200; // bone count far past EOF
+        assert!(validate("motion_1", &liar).unwrap_err().contains("claims 200 records"));
+        // A count that would overflow the length math
+        let mut overflow = bare.clone();
+        overflow.extend(u32::MAX.to_le_bytes());
+        assert!(validate("motion_1", &overflow).unwrap_err().contains("truncated"));
+
+        // Wrong or old magic
+        assert!(validate("motion_1", b"garbage").unwrap_err().contains("too short"));
+        let mut wrong = vmd.clone();
+        wrong[0] = b'X';
+        assert!(validate("motion_1", &wrong).unwrap_err().contains("not a VMD"));
+        let mut v1 = vmd.clone();
+        v1[..MAGIC_V1.len()].copy_from_slice(MAGIC_V1);
+        assert!(validate("motion_1", &v1).unwrap_err().contains("version 1"));
+    }
+}

src/router/custom_song.rs

@@ -152,6 +152,18 @@ pub fn hidden_live_ids_for_user(uid: i64) -> JsonValue {
     database::non_public_music_ids_for(uid)
 }
 
+// Whether `uid` may attach cross-feature content (a custom 3D MV) to this
+// song: it must exist, and be theirs or publicly visible. Mirrors
+// custom_card::validate_character_ref
+pub fn can_reference_song(uid: i64, music_id: i64) -> Result<(), String> {
+    if !disabled()
+        && database::get_song_owner(music_id).is_some()
+        && (database::get_song_owner(music_id) == Some(uid) || database::song_publicly_visible(music_id)) {
+        return Ok(());
+    }
+    Err(format!("Unknown music_id '{}'", music_id))
+}
+
 fn song_path(music_id: i64, file: &str) -> String {
     get_data_path(&format!("custom_songs/{}/{}", music_id, file))
 }
@@ -1135,6 +1147,8 @@ async fn delete(req: HttpRequest, body: String) -> HttpResponse {
     // Global clear-rate stats for the dead live id (per-user score records are
     // wiped lazily on each user's next userdata pull)
     crate::router::clear_rate::purge_live(music_id);
+    // A custom 3D MV can't outlive the song it plays over
+    crate::router::custom_3dmv::purge_song(music_id);
 
     let _ = fs::remove_dir_all(get_data_path(&format!("custom_songs/{}", music_id)));
     // Audio is content-addressed and may be shared with another upload

src/router/databases/mod.rs

@@ -302,6 +302,57 @@ lazy_static! {
         info
     };
 
+    // const.csv keyed by _id. Values are strings in masterdata, exactly as the
+    // client reads them (ConstMst._value + StringExtensions.ToIntOrDefault).
+    pub static ref CONST: JsonValue = index_by(&t("const"), "id");
+
+    pub static ref LIVE_BOOST: JsonValue = index_by(&t("live_boost"), "value");
+
+    // The stamps every account starts with (chat_stamp._initialStamp), in masterdata
+    // order. Officially this is the whole of a fresh account's master_chat_stamp_ids —
+    // captured /api/chat/home responses open with exactly this list before an account's
+    // earned stamps are appended (see chat::tests::the_initial_stamp_set_matches_official).
+    pub static ref INITIAL_CHAT_STAMPS: JsonValue = {
+        let mut ids = array![];
+        for data in t("chat_stamp").members() {
+            if data["initialStamp"].as_i64().unwrap_or(0) == 1 {
+                ids.push(data["id"].clone()).unwrap();
+            }
+        }
+        ids
+    };
+
+    pub static ref EVENTS: JsonValue = index_by(&t("event"), "id");
+
+    // release_label.csv keyed by _id — the open/close window masterdata rows are gated
+    // on. _openedAt / _closedAt are blank for the evergreen label (id 1).
+    pub static ref RELEASE_LABEL: JsonValue = index_by(&t("release_label"), "id");
+
+    // event_score.csv keyed by _masterEventId (Shock.EventScoreMst) — the per-event
+    // event-point yield of one live. Ratios are 1/10000, like every other ratio the
+    // client divides by COMMON_CONST.RATIO_DIVISOR.
+    pub static ref EVENT_SCORE: JsonValue = index_by(&t("event_score"), "masterEventId");
+
+    // music_level rows keyed "{masterMusicId}_{level}" — _fullCombo is the note
+    // count the multi-live miss/great-perfect ratios are measured against.
+    pub static ref MUSIC_LEVEL: JsonValue = {
+        let mut info = object! {};
+        for data in t("music_level").members() {
+            info[format!("{}_{}", data["masterMusicId"], data["level"])] = data.clone();
+        }
+        info
+    };
+
+    // multievent_rankbonus keyed "{playerCount}_{liveRank}" — _eventPtBonus is a
+    // ratio in 1/10000 (the client renders these as `sum / 100` percent).
+    pub static ref MULTIEVENT_RANK_BONUS: JsonValue = {
+        let mut info = object! {};
+        for data in t("multievent_rankbonus").members() {
+            info[format!("{}_{}", data["playerCount"], data["liveRank"])] = data.clone();
+        }
+        info
+    };
+
     pub static ref RANKS: JsonValue = t("user_rank");
 
     pub static ref USER_RANK_REWARD: JsonValue = {

src/router/event.rs

@@ -25,7 +25,39 @@ pub fn routes(cfg: &mut web::ServiceConfig) {
     );
 }
 
-fn get_event_data(key: &str, event_id: u32) -> JsonValue {
+// Whether a release_label window is open at `now`. A blank _openedAt has always been
+// open and a blank _closedAt never closes, which is how the evergreen label (id 1) is
+// expressed. _releaseStatus other than 1 is never released at all.
+pub fn release_label_is_open(label_id: i64, now: u64) -> bool {
+    let label = &databases::RELEASE_LABEL[label_id.to_string()];
+    if label.is_empty() || label["releaseStatus"].as_i64().unwrap_or(0) != 1 {
+        return false;
+    }
+    if let Some(opened) = global::parse_datetime(&label["openedAt"].to_string()) {
+        if now < opened {
+            return false;
+        }
+    }
+    if let Some(closed) = global::parse_datetime(&label["closedAt"].to_string()) {
+        if now > closed {
+            return false;
+        }
+    }
+    true
+}
+
+// Whether an event is currently running, by its own release label window. ew had no
+// in-session test before this — nothing else evaluates release_label — so this is the
+// one place to extend if the event listing ever needs the same question answered.
+pub fn is_in_session(event_id: u32, now: u64) -> bool {
+    let event = &databases::EVENTS[event_id.to_string()];
+    if event.is_empty() {
+        return false;
+    }
+    release_label_is_open(event["masterReleaseLabelId"].as_i64().unwrap_or(0), now)
+}
+
+pub fn get_event_data(key: &str, event_id: u32) -> JsonValue {
     let mut event = userdata::get_acc_event(key);
     let is_star_event = STAR_EVENT_IDS.contains(&event_id);
     //println!("is_star_event: {}, {}", is_star_event, event_id);
@@ -50,10 +82,61 @@ fn get_event_data(key: &str, event_id: u32) -> JsonValue {
         event[event_id.to_string()]["star_event"]["star_event_bonus_daily_count"] = 0.into();
     }
 
+    normalise_event_shape(&mut event[event_id.to_string()]);
+
     event[event_id.to_string()].clone()
 }
 
-fn save_event_data(key: &str, event_id: u32, data: JsonValue) {
+// The client's /api/event response types are [Serializable] C# classes, and Unity's
+// JsonUtility maps them structurally: `score_ranking`, `member_ranking` and `lottery_box`
+// are OBJECTS (Shock.ProtocolData.ScoreRanking / MemberRanking / LotteryBox), not arrays.
+// new_user_event.json used to seed them as `[]`, which the client cannot bind - and
+// MngEventData.SendGetEvent's success callback dereferences `r.data.score_ranking` and
+// friends unguarded, so a mis-shaped payload takes out the whole recv and its `onComplete`
+// is never called. That callback is the completion of a GATING TaskFlow.Step in
+// LiveRestartSelectScene.ReloadScene, so the scene hangs on its loading screen forever.
+//
+// The template is fixed, but accounts created before that keep their stored blob, so the
+// shapes are normalised on the way out as well. Coercion only ever replaces a value the
+// client could not have parsed anyway; a well-formed object is left exactly as it is.
+// `set_member` already writes member_ranking as an object, which is the shape this agrees
+// with.
+fn normalise_event_shape(event: &mut JsonValue) {
+    fn ensure_object(slot: &mut JsonValue, template: JsonValue) {
+        if !slot.is_object() {
+            *slot = template;
+        } else {
+            for (key, value) in template.entries() {
+                if slot[key].is_null() {
+                    slot[key] = value.clone();
+                }
+            }
+        }
+    }
+
+    ensure_object(&mut event["point_ranking"], object! { rank: 0, point: 0 });
+    ensure_object(&mut event["score_ranking"], object! { all_rank: 0, group_rank: 0, score: 0 });
+    ensure_object(
+        &mut event["member_ranking"],
+        object! { master_character_id: 0, rank: 0, point: 0 },
+    );
+    ensure_object(
+        &mut event["lottery_box"],
+        object! { master_lottery_id: 0, reset_count: 0, draw_count_list: array![] },
+    );
+    // Read by EventData.SetMultiParameter (help count, penalty window, disconnect flag);
+    // absent keys bind as 0/false, but sending them keeps the payload self-describing.
+    for key in ["is_disconnected", "help_count", "penalty_remaining_time"] {
+        if event[key].is_null() {
+            event[key] = 0.into();
+        }
+    }
+    if !event["mission_list"].is_array() {
+        event["mission_list"] = array![];
+    }
+}
+
+pub fn save_event_data(key: &str, event_id: u32, data: JsonValue) {
     let mut event = userdata::get_acc_event(key);
 
     // Check for old version of event data
@@ -209,7 +292,7 @@ async fn set_member(Session { key, body }: Session) -> impl Responder {
     }))
 }
 
-fn get_rank(event: u32, user_id: u64) -> u32 {
+pub fn get_rank(event: u32, user_id: u64) -> u32 {
     let scores = crate::router::event_ranking::get_raw_info(event);
 
     let mut i=1;
@@ -254,10 +337,14 @@ fn get_star_rank(points: i64) -> i64 {
 
 const LIMIT_COINS: i64 = 2000000000;
 
-fn give_event_points(event_id: u32, amount: i64, user: &mut JsonValue) -> bool {
+// The row is keyed by BOTH the event and the point type, exactly as get_points reads it
+// back. Matching on the type alone credited whichever event's row happened to come first
+// in the list — an account that had ever played a different event got its points there,
+// and get_points (which does check the id) then reported 0 for the event just played.
+pub fn give_event_points(event_id: u32, amount: i64, user: &mut JsonValue) -> bool {
     let mut has = false;
     for data in user["event_point_list"].members_mut() {
-        if data["type"] == 1 {
+        if data["type"] == 1 && data["master_event_id"] == event_id {
             has = true;
             let new_amount = data["amount"].as_i64().unwrap() + amount;
             if new_amount > LIMIT_COINS {
@@ -278,7 +365,7 @@ fn give_event_points(event_id: u32, amount: i64, user: &mut JsonValue) -> bool {
     false
 }
 
-fn get_points(event_id: u32, user: &JsonValue) -> i64 {
+pub fn get_points(event_id: u32, user: &JsonValue) -> i64 {
     for data in user["event_point_list"].members() {
         if data["type"] == 1 && data["master_event_id"] == event_id {
             return data["amount"].as_i64().unwrap()
@@ -366,3 +453,96 @@ async fn event_end(req: HttpRequest, Session { key, body }: Session) -> impl Res
 async fn event_skip(req: HttpRequest, Session { key, body }: Session) -> impl Responder {
     Api(event_live(&req, &key, &body, true))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // The client binds these with Unity's JsonUtility against [Serializable] classes:
+    // ScoreRanking { all_rank, group_rank, score }, MemberRanking { master_character_id,
+    // rank, point }, PointRanking { rank, point }, LotteryBox { master_lottery_id,
+    // reset_count, draw_count_list }. An array where an object is expected cannot bind, and
+    // MngEventData.SendGetEvent's callback dereferences them unguarded.
+    #[test]
+    fn the_new_user_template_already_has_the_client_shapes() {
+        let template: JsonValue =
+            jzon::parse(&include_file!("src/router/userdata/new_user_event.json")).unwrap();
+        for key in ["point_ranking", "score_ranking", "member_ranking", "lottery_box"] {
+            assert!(template[key].is_object(), "{} must be an object", key);
+        }
+        assert!(template["mission_list"].is_array());
+        assert_eq!(template["score_ranking"]["all_rank"], 0);
+        assert_eq!(template["member_ranking"]["master_character_id"], 0);
+        assert_eq!(template["lottery_box"]["draw_count_list"], array![]);
+    }
+
+    #[test]
+    fn stored_blobs_with_the_old_array_shapes_are_coerced() {
+        // Exactly what accounts created before the template fix have on disk.
+        let mut stored = object! {
+            point_ranking: object! { point: 12 },
+            score_ranking: array![],
+            member_ranking: array![],
+            lottery_box: array![],
+            mission_list: array![],
+        };
+        normalise_event_shape(&mut stored);
+
+        assert!(stored["score_ranking"].is_object());
+        assert_eq!(stored["score_ranking"]["all_rank"], 0);
+        assert!(stored["member_ranking"].is_object());
+        assert!(stored["lottery_box"].is_object());
+        assert_eq!(stored["lottery_box"]["draw_count_list"], array![]);
+        // A key that was already there survives; the missing sibling is filled in.
+        assert_eq!(stored["point_ranking"]["point"], 12);
+        assert_eq!(stored["point_ranking"]["rank"], 0);
+        // The multi trio EventData.SetMultiParameter reads.
+        assert_eq!(stored["is_disconnected"], 0);
+        assert_eq!(stored["help_count"], 0);
+        assert_eq!(stored["penalty_remaining_time"], 0);
+    }
+
+    #[test]
+    fn well_formed_data_is_left_alone() {
+        let mut live = object! {
+            point_ranking: object! { rank: 3, point: 900 },
+            score_ranking: object! { all_rank: 7, group_rank: 2, score: 4242 },
+            member_ranking: object! { master_character_id: 5, rank: 1, point: 10 },
+            lottery_box: object! { master_lottery_id: 8, reset_count: 1, draw_count_list: array![] },
+            mission_list: array![],
+            is_disconnected: 1,
+            help_count: 4,
+            penalty_remaining_time: 600,
+        };
+        let before = live.clone();
+        normalise_event_shape(&mut live);
+        assert_eq!(live, before);
+    }
+
+    // give_event_points and get_points must agree on what identifies a row. They did not:
+    // the write matched on the point type alone, so an account that had ever earned points
+    // in ANY event credited every later event to that first row — and get_points, which
+    // does compare the event id, then reported 0 for the event actually played.
+    #[test]
+    fn event_points_land_in_the_row_for_that_event() {
+        let mut user = object!{ event_point_list: array![] };
+
+        give_event_points(108, 35, &mut user);
+        assert_eq!(get_points(108, &user), 35);
+
+        // A second event opens a row of its own and leaves the first one alone.
+        give_event_points(111, 70, &mut user);
+        assert_eq!(get_points(111, &user), 70);
+        assert_eq!(get_points(108, &user), 35);
+        assert_eq!(user["event_point_list"].len(), 2);
+
+        // And a second live in the first event still adds to the first row.
+        give_event_points(108, 35, &mut user);
+        assert_eq!(get_points(108, &user), 70);
+        assert_eq!(get_points(111, &user), 70);
+        assert_eq!(user["event_point_list"].len(), 2);
+
+        // An event never played is worth nothing, not somebody else's total.
+        assert_eq!(get_points(115, &user), 0);
+    }
+}

src/router/global.rs

@@ -23,10 +23,10 @@ struct AssetVersion {
 
 static ASSET_VERSIONS: &[AssetVersion] = &[
     // Default / stock
-    AssetVersion { region: "JP", platform: "Android", version: "4c921d2443335e574a82e04ec9ea243c", hash: "67f8f261c16b3cca63e520a25aad6c1c", latest: true },
-    AssetVersion { region: "JP", platform: "iOS",     version: "4c921d2443335e574a82e04ec9ea243c", hash: "b8975be8300013a168d061d3fdcd4a16", latest: true },
-    AssetVersion { region: "GL", platform: "Android", version: "5260ff15dff8ba0c00ad91400f515f55", hash: "d210b28037885f3ef56b8f8aa45ac95b", latest: true },
-    AssetVersion { region: "GL", platform: "iOS",     version: "5260ff15dff8ba0c00ad91400f515f55", hash: "dd7175e4bcdab476f38c33c7f34b5e4d", latest: true },
+    AssetVersion { region: "JP", platform: "Android", version: "4c921d2443335e574a82e04ec9ea243c", hash: "67f8f261c16b3cca63e520a25aad6c1c", latest: false },
+    AssetVersion { region: "JP", platform: "iOS",     version: "4c921d2443335e574a82e04ec9ea243c", hash: "b8975be8300013a168d061d3fdcd4a16", latest: false },
+    AssetVersion { region: "GL", platform: "Android", version: "5260ff15dff8ba0c00ad91400f515f55", hash: "d210b28037885f3ef56b8f8aa45ac95b", latest: false },
+    AssetVersion { region: "GL", platform: "iOS",     version: "5260ff15dff8ba0c00ad91400f515f55", hash: "dd7175e4bcdab476f38c33c7f34b5e4d", latest: false },
 
     // Re-written client versions 2.0.0 - 2.1.2 (windows only)
     AssetVersion { region: "JP", platform: "Windows", version: "4c921d2443335e574a82e04ec9ea243c", hash: "4ed1d077df2d1b29e17d25d64fb37242", latest: false },
@@ -35,11 +35,21 @@ static ASSET_VERSIONS: &[AssetVersion] = &[
     AssetVersion { region: "JP", platform: "Windows", version: "ced44f266b4e4c8eb05fe417fd5f3d1b", hash: "ec508163f04e0f9e0435b4302011d123", latest: false },
     AssetVersion { region: "JP", platform: "Android", version: "ced44f266b4e4c8eb05fe417fd5f3d1b", hash: "27eabc1af04fa6e4a727516d2bbdadff", latest: false },
 
-    // Re-written client versions 2.3.0 -
-    AssetVersion { region: "JP", platform: "Windows", version: "1b2fe99a639b4ca491afe1a841f19d56", hash: "fd37b607ca271a6ffe17b1e2046c45ad", latest: true },
+    // Re-written client versions 2.3.0 - 2.3.2
+    AssetVersion { region: "JP", platform: "Windows", version: "1b2fe99a639b4ca491afe1a841f19d56", hash: "fd37b607ca271a6ffe17b1e2046c45ad", latest: false },
     AssetVersion { region: "JP", platform: "Android", version: "1b2fe99a639b4ca491afe1a841f19d56", hash: "ed8f4b8df9d3935d689e1236a6816b2b", latest: false },
     AssetVersion { region: "JP", platform: "iOS",     version: "1b2fe99a639b4ca491afe1a841f19d56", hash: "407a8fd81cc5f525ad12c957dbefccb2", latest: false },
 
+    // Re-written client versions 2.4.0 - 2.4.2
+    AssetVersion { region: "JP", platform: "Windows", version: "7d9c2e5efa794a048c11bcaf781ace79", hash: "d1b4db937c1af8364d38f08296cbcfae", latest: false },
+    AssetVersion { region: "JP", platform: "Android", version: "7d9c2e5efa794a048c11bcaf781ace79", hash: "8fcb61a08e69d854438c4f318d38cabd", latest: false },
+    AssetVersion { region: "JP", platform: "iOS",     version: "7d9c2e5efa794a048c11bcaf781ace79", hash: "65bb39a0030620d9720edb5e65d31ac3", latest: false },
+
+    // Re-written client versions 2.5.0 -
+    AssetVersion { region: "JP", platform: "Windows", version: "01a71b00f63e4dba92117ac7e60070a6", hash: "b8d0e7edcb63f5bdd28817a597772ca6", latest: true },
+    AssetVersion { region: "JP", platform: "Android", version: "01a71b00f63e4dba92117ac7e60070a6", hash: "d12cecc5695da7f81f8873a3ff93752e", latest: true },
+    AssetVersion { region: "JP", platform: "iOS",     version: "01a71b00f63e4dba92117ac7e60070a6", hash: "7c1f61ee68ac84c82dd397a162629142", latest: true },
+
     //AssetVersion { region: "JP", platform: "WebGL",   version: "4c921d2443335e574a82e04ec9ea243c", hash: "e1ff7c74b20c8d216507972b6f24b9df", latest: true },
 ];
 
@@ -289,6 +299,48 @@ pub fn format_datetime(time: u64) -> String {
     format!("{:04}-{:02}-{:02} {:02}:{:02}:{:02}", y, m, d, secs / 3600, (secs % 3600) / 60, secs % 60)
 }
 
+// Inverse of civil_from_days (Howard Hinnant's days_from_civil).
+fn days_from_civil(y: i64, m: i64, d: i64) -> i64 {
+    let y = if m <= 2 { y - 1 } else { y };
+    let era = if y >= 0 { y } else { y - 399 } / 400;
+    let yoe = y - era * 400;
+    let mp = if m > 2 { m - 3 } else { m + 9 };
+    let doy = (153 * mp + 2) / 5 + d - 1;
+    let doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
+    era * 146097 + doe - 719468
+}
+
+// Parses the datetime shape masterdata uses ("2023/06/19 5:00:00", also tolerating
+// '-' separators and a missing time part) into the same naive seconds-since-epoch
+// scale format_datetime prints. Naive on purpose: every consumer compares a
+// masterdata timestamp against a server timestamp, so both sides share the offset.
+pub fn parse_datetime(text: &str) -> Option<u64> {
+    let text = text.trim();
+    if text.is_empty() {
+        return None;
+    }
+    let (date, time) = match text.split_once(' ') {
+        Some((date, time)) => (date, time),
+        None => (text, "0:0:0")
+    };
+
+    let mut date_parts = date.split(['/', '-']);
+    let y = date_parts.next()?.trim().parse::<i64>().ok()?;
+    let m = date_parts.next()?.trim().parse::<i64>().ok()?;
+    let d = date_parts.next()?.trim().parse::<i64>().ok()?;
+    if !(1..=12).contains(&m) || !(1..=31).contains(&d) {
+        return None;
+    }
+
+    let mut time_parts = time.split(':');
+    let hh = time_parts.next().unwrap_or("0").trim().parse::<i64>().ok()?;
+    let mm = time_parts.next().unwrap_or("0").trim().parse::<i64>().ok()?;
+    let ss = time_parts.next().unwrap_or("0").trim().parse::<i64>().ok()?;
+
+    let secs = days_from_civil(y, m, d) * 86400 + hh * 3600 + mm * 60 + ss;
+    if secs < 0 { None } else { Some(secs as u64) }
+}
+
 fn init_time(current_time: u64, server_data: &mut JsonValue, token: &str, max_time: u64, max: bool) {
     let mut edited = false;
     let default_time = 1709272800;

src/router/gree.rs

@@ -194,14 +194,34 @@ async fn payment_ticket(req: HttpRequest) -> impl Responder {
 
 async fn migration_verify(req: HttpRequest, body: String) -> impl Responder {
     let body = jzon::parse(&body).unwrap();
+    let migration_code = body["migration_code"].to_string();
     let password = decrypt_transfer_password(&body["migration_password"].to_string());
 
-    let user = userdata::user::migration::get_acc_transfer(&body["migration_code"].to_string(), &password);
+    let user = userdata::user::migration::get_acc_transfer(&migration_code, &password);
 
     let resp = if !user["success"].as_bool().unwrap() || user["user_id"] == 0 {
+        // The gree error envelope REQUIRES `code` and `message` on a failure. The old
+        // {result:"ERR", messsage:"User Not Found"} shape had neither (and misspelt the key),
+        // which breaks both native gamelibs:
+        //   * iOS: +[GGLError errorWithJson:] builds
+        //     @{NSLocalizedDescriptionKey: message} with message == nil ->
+        //     NSInvalidArgumentException "attempt to insert nil object from objects[0]" -> the app
+        //     hard-crashes the moment a wrong password / unknown code is entered on the new device.
+        //     (It also reads `code` as [nil integerValue] == 0 == SUCCESS, so a non-crashing build
+        //     would have run the success path on an empty payload.)
+        //   * managed: Shock.GGL.Payment.GGLVerifyMigrationCode.CanRetry(code) tests
+        //     code == 7004 (kGGLPErrorVerifyMigrationIncorrectPassword) to show the
+        //     "re-enter your password" dialog instead of the fatal error dialog.
+        // 7002 = kGGLPErrorVerifyMigrationCodeNotExist, 7004 = incorrect password.
+        let (code, message) = if userdata::user::migration::transfer_code_exists(&migration_code) {
+            (7004, "Migration password is incorrect")
+        } else {
+            (7002, "Migration code does not exist")
+        };
         object!{
-            result: "ERR",
-            messsage: "User Not Found"
+            result: "NG",
+            code: code,
+            message: message
         }
     } else {
         let data_user = userdata::get_acc(&user["login_token"].to_string());

src/router/home.rs

@@ -124,6 +124,10 @@ async fn home(Login(key): Login) -> impl Responder {
     }
     user["home"]["unread_chat_count"] = chat_count.into();
 
+    let seen_at = user["home"]["announcement_seen_at"].as_i64().unwrap_or(0);
+    let new_announcement = crate::database::announcements::latest_published_at() > seen_at;
+    user["home"]["new_announcement_flag"] = (new_announcement as i32).into();
+
     //todo
     user["home"]["beginner_mission_complete"] = 1.into();
 

src/router/live.rs

@@ -3,7 +3,7 @@ use actix_web::{web, HttpRequest, Responder};
 use rand::RngExt;
 use lazy_static::lazy_static;
 
-use crate::router::{databases, global, items, userdata, Login, Session, Api};
+use crate::router::{arcade, databases, global, items, userdata, Login, Session, Api};
 use crate::router::clear_rate::live_completed;
 use crate::router::tools::guest;
 
@@ -25,9 +25,21 @@ pub fn routes(cfg: &mut web::ServiceConfig) {
 
 
 async fn retire(Session { key, body }: Session) -> impl Responder {
+    // An arcade song whose life gauge emptied is played out and reported here,
+    // not at /live/end: there is no cleared flag on the end wire and live_end_ex
+    // records a clear unconditionally. So this is the only place the cabinet's
+    // ledger can learn about a failed song, and it has to look before live_retire
+    // sweeps the start record that proves the song was a cabinet's. Nothing about
+    // an ordinary retire changes: an unflagged start answers None here.
+    let arcade_user = arcade::arcade_retire_user(&key, &body);
     live_retire(&key, &body);
+    if let Some(user_id) = arcade_user {
+        arcade::record_play(user_id, &body, false);
+    }
     if body["live_score"]["play_time"].as_i64().unwrap_or(0) > 5 {
-        live_completed(body["master_live_id"].as_i64().unwrap(), body["level"].as_i32().unwrap(), true, 0, 0);
+        // Body-derived, so defaulted rather than unwrapped: a retire is not worth a
+        // panicked worker either (live_completed ignores an unknown id/level).
+        live_completed(body["master_live_id"].as_i64().unwrap_or(0), body["level"].as_i32().unwrap_or(0), true, 0, 0);
     }
     Api(Some(object!{
         "stamina": {},
@@ -222,12 +234,15 @@ fn check_for_stale_data(server_data: &mut JsonValue, live_id: i64) {
     let mut expired = array![];
     let curr_time = global::timestamp();
     for (i, live) in server_data["last_live_started"].members().enumerate() {
-        if live["expire_date_time"].as_u64().unwrap() < curr_time || live["master_live_id"] == live_id {
+        // A record with no readable expiry is treated as expired rather than panicking:
+        // start_live always writes one, so this is a corrupt/hand-edited row.
+        let stale = live["expire_date_time"].as_u64().unwrap_or(0) < curr_time;
+        if stale || live["master_live_id"] == live_id {
             expired.push(i).unwrap();
         }
-        if live["expire_date_time"].as_u64().unwrap() < curr_time {
+        if stale {
             // User closed game after losing. Count this as a fail.
-            live_completed(live["master_live_id"].as_i64().unwrap(), live["level"].as_i32().unwrap(), true, 0, 0);
+            live_completed(live["master_live_id"].as_i64().unwrap_or(0), live["level"].as_i32().unwrap_or(0), true, 0, 0);
         }
     }
     for i in expired.members() {
@@ -243,34 +258,94 @@ fn get_end_live_deck_id(login_token: &str, body: &JsonValue) -> Option<i32> {
     let index = server_data["last_live_started"].members().position(|r| r["master_live_id"] == body["master_live_id"])?;
     let rv = server_data["last_live_started"][index]["deck_slot"].as_i32()?;
 
-    check_for_stale_data(&mut server_data, body["master_live_id"].as_i64().unwrap());
+    check_for_stale_data(&mut server_data, body["master_live_id"].as_i64().unwrap_or(0));
     userdata::save_server_data(login_token, server_data);
     Some(rv)
 }
 
-pub fn get_end_live_event_id(login_token: &str, body: &JsonValue) -> Option<u32> {
+// The whole payload the client POSTed to */start for this live, as recorded by
+// start_live. /multi_live/end needs the boost and deck slot out of it, and its
+// own request body carries neither.
+pub fn get_started_live(login_token: &str, body: &JsonValue) -> Option<JsonValue> {
     let server_data = userdata::get_server_data(login_token);
     if server_data["last_live_started"].is_null() {
         return None;
     }
     let index = server_data["last_live_started"].members().position(|r| r["master_live_id"] == body["master_live_id"])?;
-    let rv = server_data["last_live_started"][index]["master_event_id"].as_u32()?;
-
-    Some(rv)
+    Some(server_data["last_live_started"][index].clone())
 }
 
-fn live_retire(login_token: &str, body: &JsonValue) {
+// Claims the record start_live left behind: it is returned AND removed in one atomic
+// step, so of N ends arriving together for one live exactly one gets Some and every other
+// gets None. /multi_live/end awards off that Some and answers a None from current state,
+// which is what makes its duplicate protection deliberate rather than a side effect of
+// get_end_live_deck_id's shape (that one only consumed when the record carried a numeric
+// deck_slot, and only long after the awarding decision had been taken).
+//
+// The stale sweep check_for_stale_data does is folded in unchanged: records past their
+// hour count as a fail and go, so live_end_ex's own later sweep finds nothing left to
+// count twice. live_completed is called after the transaction commits - it writes to a
+// different database and has no business running inside this one's write lock.
+//
+// Solo /live/end is deliberately NOT routed through here: it still consumes its record
+// inside live_end_ex exactly as it always did.
+pub fn take_started_live(login_token: &str, body: &JsonValue) -> Option<JsonValue> {
+    let live_id = body["master_live_id"].clone();
+    let curr_time = global::timestamp();
+    let mut failed: Vec<(i64, i32)> = Vec::new();
+
+    let taken = userdata::modify_server_data(login_token, |server_data| {
+        if server_data["last_live_started"].is_null() {
+            server_data["last_live_started"] = array![];
+        }
+        let mut taken: Option<JsonValue> = None;
+        let mut kept = array![];
+        for live in server_data["last_live_started"].members() {
+            let stale = live["expire_date_time"].as_u64().unwrap_or(0) < curr_time;
+            let mine = live["master_live_id"] == live_id;
+            if stale {
+                // User closed game after losing. Count this as a fail.
+                failed.push((
+                    live["master_live_id"].as_i64().unwrap_or(0),
+                    live["level"].as_i32().unwrap_or(0)
+                ));
+            }
+            if mine && taken.is_none() {
+                taken = Some(live.clone());
+            } else if !stale && !mine {
+                kept.push(live.clone()).unwrap();
+            }
+        }
+        server_data["last_live_started"] = kept;
+        taken
+    });
+
+    for (id, level) in failed {
+        live_completed(id, level, true, 0, 0);
+    }
+    taken
+}
+
+pub fn get_end_live_event_id(login_token: &str, body: &JsonValue) -> Option<u32> {
+    get_started_live(login_token, body)?["master_event_id"].as_u32()
+}
+
+pub fn live_retire(login_token: &str, body: &JsonValue) {
     let mut server_data = userdata::get_server_data(login_token);
-    check_for_stale_data(&mut server_data, body["master_live_id"].as_i64().unwrap());
+    // A body with no master_live_id matches nothing (0 is not a live id); the stale sweep
+    // still runs, which is all a retire with a malformed body can honestly do.
+    check_for_stale_data(&mut server_data, body["master_live_id"].as_i64().unwrap_or(0));
     userdata::save_server_data(login_token, server_data);
 }
 
-fn start_live(login_token: &str, body: &JsonValue) {
+pub fn start_live(login_token: &str, body: &JsonValue) {
     let mut server_data = userdata::get_server_data(login_token);
     if server_data["last_live_started"].is_null() {
         server_data["last_live_started"] = array![];
     }
-    check_for_stale_data(&mut server_data, body["master_live_id"].as_i64().unwrap());
+    // Body-derived: /multi_live/start forwards a body this server never validated, and a
+    // start with no live id must record a useless record rather than panic a worker.
+    check_for_stale_data(&mut server_data, body["master_live_id"].as_i64().unwrap_or(0));
     let mut to_save = body.clone();
     // The user has 1 hour to complete a live
     to_save["expire_date_time"] = (global::timestamp() + (1 * 60 * 60)).into();
@@ -280,6 +355,10 @@ fn start_live(login_token: &str, body: &JsonValue) {
 }
 
 async fn start(Session { key, body }: Session) -> impl Responder {
+    // A live starting on an arcade cabinet is a sighting for that cabinet: its
+    // last_seen is what the TTL sweeper measures, and a machine in daily use
+    // must never age out from under its own players.
+    arcade::live_started(&key, &body);
     start_live(&key, &body);
     Api(Some(array![]))
 }
@@ -311,24 +390,32 @@ fn get_clear_count(id: i64, user: &JsonValue) -> i64 {
     rv
 }
 
-pub fn update_live_data(user: &mut JsonValue, data: &JsonValue, add: bool) -> JsonValue {
+// `record_high_score=false` plays this live for the clear count and the max combo but
+// leaves the stored high score alone: it enters the keep-best comparison below as 0, so
+// the existing record always wins and is what gets reported back. That is the official
+// treatment of a public multi live ("本イベントでは HIGH SCOREは更新されません"), which
+// /multi_live/end asks for — see the score-board note in live_end_ex.
+pub fn update_live_data(user: &mut JsonValue, data: &JsonValue, add: bool, record_high_score: bool) -> JsonValue {
     if user["tutorial_step"].as_i32().unwrap() < 130 {
         return JsonValue::Null;
     }
-    
+
+    // Every field here comes off the request body, so a malformed end must not panic a
+    // worker: a missing id/level/score reads as 0, which is what an empty live record
+    // would have held anyway.
     let mut rv = object!{
-        "master_live_id": data["master_live_id"].as_i64().unwrap(),
-        "level": data["level"].as_i64().unwrap(),
+        "master_live_id": data["master_live_id"].as_i64().unwrap_or(0),
+        "level": data["level"].as_i64().unwrap_or(0),
         "clear_count": 1,
-        "high_score": data["live_score"]["score"].as_i64().unwrap(),
-        "max_combo": data["live_score"]["max_combo"].as_i64().unwrap(),
+        "high_score": if record_high_score { data["live_score"]["score"].as_i64().unwrap_or(0) } else { 0 },
+        "max_combo": data["live_score"]["max_combo"].as_i64().unwrap_or(0),
         "auto_enable": 1, //whats this?
         "updated_time": global::timestamp()
     };
     
     let mut has = false;
     for current in user["live_list"].members_mut() {
-        if current["master_live_id"] == rv["master_live_id"] && (current["level"] == rv["level"] || data["level"].as_i32().unwrap() == 0) {
+        if current["master_live_id"] == rv["master_live_id"] && (current["level"] == rv["level"] || data["level"].as_i32().unwrap_or(0) == 0) {
             has = true;
             if add {
                 rv["clear_count"] = (current["clear_count"].as_i64().unwrap() + 1).into();
@@ -348,7 +435,7 @@ pub fn update_live_data(user: &mut JsonValue, data: &JsonValue, add: bool) -> Js
             }
             current["updated_time"] = rv["updated_time"].clone();
             rv["level"] = current["level"].clone();
-            if data["level"].as_i32().unwrap() != 0 {
+            if data["level"].as_i32().unwrap_or(0) != 0 {
                 break;
             }
         }
@@ -586,22 +673,46 @@ fn get_live_character_list(lp_used: i32, deck_id: i32, user: &mut JsonValue, mis
 }
 
 pub fn live_end(req: &HttpRequest, key: &str, body: &JsonValue, skipped: bool) -> JsonValue {
+    live_end_ex(req, key, body, skipped, true, true)
+}
+
+// consume_lp=false is for lives whose stamina was already taken up front
+// (/multi_live/start does that, because its response reports consumed_stamina).
+// Everything else still scales off lp_used, so the caller injects use_lp.
+//
+// update_score_board=false plays the live without recording a score anywhere: neither the
+// account's own high score for the song nor the per-song board /live/ranking serves. Only
+// /multi_live/end passes false, and only for a PUBLIC (random matchmaking) room — see the
+// privacy note there. Everything else about the live is untouched: the clear count, the
+// max combo, the clear-rate counters, missions and every reward are computed off this
+// play's own score exactly as they always were.
+pub fn live_end_ex(req: &HttpRequest, key: &str, body: &JsonValue, skipped: bool, consume_lp: bool, update_score_board: bool) -> JsonValue {
     let mut user2 = userdata::get_acc_home(&key);
     let mut user = userdata::get_acc(&key);
     let mut user_missions = userdata::get_acc_missions(&key);
     let mut chats = userdata::get_acc_chats(&key);
 
+    // Read once, off the request, with a default each: a client (or a replayed/forged
+    // POST) that omits a field must get a wrong-but-harmless result, not a panicked
+    // worker. /multi_live/end is the reachable path — it forwards a body this handler
+    // never validated — but the solo path gets the same treatment, and for a well-formed
+    // body every one of these is exactly what the old unwrap produced.
+    let live_id = body["master_live_id"].as_i64().unwrap_or(0);
+    let level = body["level"].as_i64().unwrap_or(0);
+    let score = body["live_score"]["score"].as_i64().unwrap_or(0);
+    let max_combo = body["live_score"]["max_combo"].as_i64().unwrap_or(0);
+
     let jp = items::get_region(req.headers());
     let first_clear = !skipped
         && user["tutorial_step"].as_i32().unwrap() >= 130
-        && get_clear_count(body["master_live_id"].as_i64().unwrap(), &user) == 0;
+        && get_clear_count(live_id, &user) == 0;
 
     let live = if skipped {
         items::use_item(&object!{
             value: 21000001,
             amount: 1,
             consumeType: 4
-        }, body["live_boost"].as_i64().unwrap(), &mut user);
+        }, body["live_boost"].as_i64().unwrap_or(0), &mut user);
         update_live_data(&mut user, &object!{
             master_live_id: body["master_live_id"].clone(),
             level: 0,
@@ -609,9 +720,9 @@ pub fn live_end(req: &HttpRequest, key: &str, body: &JsonValue, skipped: bool) -
                 score: 1,
                 max_combo: 1
             }
-        }, false)
+        }, false, update_score_board)
     } else {
-        update_live_data(&mut user, &body, true)
+        update_live_data(&mut user, &body, true, update_score_board)
     };
     
     //1273009, 1273010, 1273011, 1273012
@@ -626,21 +737,27 @@ pub fn live_end(req: &HttpRequest, key: &str, body: &JsonValue, skipped: bool) -
         }
     }
     
+    // The account the per-song board is keyed by, or 0 to leave the board alone —
+    // clear_rate::update_live_score's own "no user, no board entry" guard, which is how
+    // /live/retire already counts a play it must not rank. The clear-rate counters still
+    // get the play either way: a public multi live really was played.
+    let board_uid = if update_score_board { user["user"]["id"].as_i64().unwrap() } else { 0 };
+
     let missions;
     if skipped {
-        live_completed(body["master_live_id"].as_i64().unwrap(), live["level"].as_i32().unwrap(), false, live["high_score"].as_i64().unwrap(), user["user"]["id"].as_i64().unwrap());
-        let clear_count = get_clear_count(body["master_live_id"].as_i64().unwrap(), &user);
+        live_completed(live_id, live["level"].as_i32().unwrap_or(0), false, live["high_score"].as_i64().unwrap_or(0), board_uid);
+        let clear_count = get_clear_count(live_id, &user);
 
-        missions = get_live_mission_completed_ids(&user, body["master_live_id"].as_i64().unwrap(), live["high_score"].as_i64().unwrap(), live["max_combo"].as_i64().unwrap(), clear_count, live["level"].as_i64().unwrap(), false, false).unwrap_or(array![]);
+        missions = get_live_mission_completed_ids(&user, live_id, live["high_score"].as_i64().unwrap_or(0), live["max_combo"].as_i64().unwrap_or(0), clear_count, live["level"].as_i64().unwrap_or(0), false, false).unwrap_or(array![]);
     } else {
-        live_completed(body["master_live_id"].as_i64().unwrap(), body["level"].as_i32().unwrap(), false, body["live_score"]["score"].as_i64().unwrap(), user["user"]["id"].as_i64().unwrap());
-        let clear_count = get_clear_count(body["master_live_id"].as_i64().unwrap(), &user);
+        live_completed(live_id, level as i32, false, score, board_uid);
+        let clear_count = get_clear_count(live_id, &user);
 
         let is_full_combo = (body["live_score"]["good"].as_i32().unwrap_or(1) + body["live_score"]["bad"].as_i32().unwrap_or(1) + body["live_score"]["miss"].as_i32().unwrap_or(1)) == 0;
 
         let is_perfect = is_full_combo && body["live_score"]["great"].as_i32().unwrap_or(1) == 0;
 
-        missions = get_live_mission_completed_ids(&user, body["master_live_id"].as_i64().unwrap(), body["live_score"]["score"].as_i64().unwrap(), body["live_score"]["max_combo"].as_i64().unwrap(), clear_count, body["level"].as_i64().unwrap(), is_full_combo, is_perfect).unwrap_or(array![]);
+        missions = get_live_mission_completed_ids(&user, live_id, score, max_combo, clear_count, level, is_full_combo, is_perfect).unwrap_or(array![]);
     
         if is_full_combo {
             if items::advance_mission(1176001, 1, 1, &mut user_missions).is_some() {
@@ -665,13 +782,13 @@ pub fn live_end(req: &HttpRequest, key: &str, body: &JsonValue, skipped: bool) -
         if is_perfect && items::advance_mission(1177001, 1, 1, &mut user_missions).is_some() {
             cleared_missions.push(1177001).unwrap();
         }
-        if is_perfect && body["level"].as_i32().unwrap() == 4 && items::advance_mission(1177002, 1, 1, &mut user_missions).is_some() {
+        if is_perfect && level == 4 && items::advance_mission(1177002, 1, 1, &mut user_missions).is_some() {
             cleared_missions.push(1177002).unwrap();
         }
     }
     
     update_live_mission_data(&mut user, &object!{
-        master_live_id: body["master_live_id"].as_i64().unwrap(),
+        master_live_id: live_id,
         clear_master_live_mission_ids: missions.clone()
     });
     
@@ -679,7 +796,9 @@ pub fn live_end(req: &HttpRequest, key: &str, body: &JsonValue, skipped: bool) -
 
     let mut reward_list = give_mission_rewards(&mut user, &mut user2, &missions, &mut user_missions, &mut cleared_missions, &mut chats, (lp_used / 10) as i64, jp);
 
-    items::lp_modification(&mut user, lp_used as u64, true);
+    if consume_lp {
+        items::lp_modification(&mut user, lp_used as u64, true);
+    }
 
     items::give_exp(lp_used, &mut user, &mut user_missions, &mut cleared_missions);
 
@@ -735,6 +854,18 @@ pub fn live_end(req: &HttpRequest, key: &str, body: &JsonValue, skipped: bool) -
 }
 
 async fn end(req: HttpRequest, Session { key, body }: Session) -> impl Responder {
+    // "arcade": true - a credit in the cabinet already paid for this play, so LP
+    // is neither read nor decremented. The seam is the one /multi_live/end uses
+    // (live_end_ex's consume_lp), with use_lp injected as one normal 1x play, so
+    // every reward, the EXP, the bonds, the high score and the clear all record
+    // exactly as they do for a phone player. The flag is only honoured for an
+    // account that really belongs to a cabinet - see arcade::arcade_play_user.
+    if let Some(user_id) = arcade::arcade_play_user(&key, &body) {
+        let body = arcade::live_end_body(&body);
+        let rv = live_end_ex(&req, &key, &body, false, false, true);
+        arcade::record_play(user_id, &body, true);
+        return Api(Some(rv));
+    }
     Api(Some(live_end(&req, &key, &body, false)))
 }
 
@@ -761,7 +892,7 @@ mod tests {
             master_live_id: live_id,
             level: level,
             live_score: { score: score, max_combo: combo }
-        }, true);
+        }, true, true);
         userdata::save_acc(token, user);
     }
 
@@ -769,6 +900,118 @@ mod tests {
         get_clear_count(live_id, &userdata::get_acc(token))
     }
 
+    // The same clear with the score board switched off, which is what live_end_ex does for
+    // a multi live played in a PUBLIC room. Returns the `live` record the client is
+    // answered with.
+    fn record_unscored_clear(token: &str, live_id: i64, level: i64, score: i64, combo: i64) -> JsonValue {
+        let mut user = userdata::get_acc(token);
+        let live = update_live_data(&mut user, &object!{
+            master_live_id: live_id,
+            level: level,
+            live_score: { score: score, max_combo: combo }
+        }, true, false);
+        userdata::save_acc(token, user);
+        live
+    }
+
+    fn stored_live(token: &str, live_id: i64) -> JsonValue {
+        userdata::get_acc(token)["live_list"]
+            .members()
+            .find(|l| l["master_live_id"] == live_id)
+            .cloned()
+            .unwrap_or(JsonValue::Null)
+    }
+
+    // /multi_live/end's score-board branch, at the write it actually gates. live_end_ex
+    // itself cannot be driven from a test (items::get_region reaches the clap parser, which
+    // rejects the harness's own arguments), so the two halves of the gate are pinned where
+    // they live: the account's own high score here, and the per-song board next door in
+    // clear_rate.
+    //
+    // A PRIVATE room is the unchanged path: it records exactly like a solo live, keep-best.
+    #[test]
+    fn a_private_multi_live_records_its_score_keep_best() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let token = "sb_private_room";
+        register_account(token);
+
+        record_clear(token, STOCK_LIVE_ID, 4, 500000, 320);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["high_score"], 500000);
+
+        // A better score wins...
+        record_clear(token, STOCK_LIVE_ID, 4, 600000, 340);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["high_score"], 600000);
+
+        // ...and a worse one never overwrites it.
+        record_clear(token, STOCK_LIVE_ID, 4, 100000, 20);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["high_score"], 600000);
+        assert_eq!(pulled_clear_count(token, STOCK_LIVE_ID), 3);
+    }
+
+    // A PUBLIC room is the official behaviour: the play counts, the score does not.
+    #[test]
+    fn a_public_multi_live_leaves_the_high_score_alone() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let token = "sb_public_room";
+        register_account(token);
+
+        record_clear(token, STOCK_LIVE_ID, 4, 500000, 320);
+
+        // A score that would beat the stored one is not recorded, and the answer the client
+        // gets back reports the record that still stands rather than this play's score.
+        let live = record_unscored_clear(token, STOCK_LIVE_ID, 4, 900000, 400);
+        assert_eq!(live["high_score"], 500000);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["high_score"], 500000);
+
+        // Everything else about the live still lands: the clear counts and the combo is a
+        // real one (the client only ever said HIGH SCORE was not updated).
+        assert_eq!(pulled_clear_count(token, STOCK_LIVE_ID), 2);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["max_combo"], 400);
+    }
+
+    // The solo path is untouched by the multi branch: live_end — the only entry /live/end
+    // and /live/skip have — calls live_end_ex with update_score_board hardcoded true, so a
+    // solo live writes exactly what it always did.
+    #[test]
+    fn the_solo_live_path_still_records_its_score() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let token = "sb_solo_path";
+        register_account(token);
+
+        record_clear(token, STOCK_LIVE_ID, 4, 450000, 300);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["high_score"], 450000);
+
+        // /live/skip's shape: level 0 matches whatever level is stored, its stand-in score
+        // of 1 can never beat the record, and the record is what it answers with.
+        let mut user = userdata::get_acc(token);
+        let live = update_live_data(&mut user, &object!{
+            master_live_id: STOCK_LIVE_ID,
+            level: 0,
+            live_score: { score: 1, max_combo: 1 }
+        }, false, true);
+        userdata::save_acc(token, user);
+        assert_eq!(live["high_score"], 450000);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["high_score"], 450000);
+    }
+
+    #[test]
+    fn a_public_multi_live_on_a_new_song_records_no_score_at_all() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let token = "sb_public_first_play";
+        register_account(token);
+
+        // The first ever play of the song is a public multi: the song gets a live record
+        // so the clear counts, but there is no high score to show for it.
+        let live = record_unscored_clear(token, STOCK_LIVE_ID, 4, 900000, 400);
+        assert_eq!(live["high_score"], 0);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["high_score"], 0);
+        assert_eq!(pulled_clear_count(token, STOCK_LIVE_ID), 1);
+
+        // A later solo play sets it for real.
+        record_clear(token, STOCK_LIVE_ID, 4, 300000, 100);
+        assert_eq!(stored_live(token, STOCK_LIVE_ID)["high_score"], 300000);
+    }
+
     #[test]
     fn clear_count_persists_with_custom_songs_disabled() {
         let _lock = crate::runtime::lock_test_data_path();

src/router/multi_live.rs

@@ -0,0 +1,797 @@
+// Wire format shared with the C# client rewrite; see docs/multi-live-ws-protocol.md.
+mod proto;
+// Lobby/room state machine, WebSocket-free so it can be tested without a socket.
+mod rooms;
+// The /multi_live/ws endpoint itself.
+mod ws;
+
+use jzon::{object, JsonValue};
+use actix_web::{web, HttpRequest, Responder};
+
+use crate::router::{databases, event, event_ranking, global, items, live, userdata, Session, Api};
+
+// The relay's expiry timers (held slots, empty rooms, dead connections). Started once from
+// run_server; see ws::start_sweeper for why it is not lazily started by the first upgrade.
+pub use ws::start_sweeper;
+
+pub fn routes(cfg: &mut web::ServiceConfig) {
+    cfg.service(
+        web::scope("/multi_live")
+            .route("/start", web::post().to(start))
+            .route("/end", web::post().to(end))
+            // The Photon replacement. Note this sits inside the /api scope, so the
+            // handshake goes through webui_fallback and must carry the usual
+            // aoharu-asset-version header like every other game request.
+            .route("/ws", web::get().to(ws::ws))
+    );
+}
+
+// Shock.MULTI_LIVE_END_STATUS, the enum RecvMultiLiveEndRData.is_penalty_miss_ratio
+// is cast to (MngLiveData.SendMultiLiveEnd).
+//   NONE(0)                        - normal result, client processes every reward list.
+//   MISS_RATIO_PENALTY_STATUS(1)   - MngLiveData bails out right after user/stamina,
+//                                    LiveScene.OnMultiLiveEnd leaves the room and
+//                                    returns to the multi-event top. Nothing is awarded.
+//   GREAT_PERFECT_LOW_RATIO_STATUS(2) - rewards still apply, the client only raises
+//                                    MultiEventLiveResult.IsOpenCautionDialog.
+const STATUS_NONE: u8 = 0;
+const STATUS_MISS_RATIO_PENALTY: u8 = 1;
+const STATUS_GREAT_PERFECT_LOW_RATIO: u8 = 2;
+
+// Shock.COMMON_CONST.RATIO_DIVISOR. Every ratio in masterdata (event_score._eventPointRatio
+// / ._eventBoostRatio, live_boost._eventPointRatio, multievent_rankbonus._eventPtBonus,
+// multievent_card_bonus._pointBonusRatioList) is stored in 1/10000 and divided by this.
+const RATIO_ONE: i64 = 10000;
+
+// Extended-protocol revision this feature requires (X-Protocol-Version, the same ladder
+// card.rs=2 / custom_card.rs=3 use). Older client builds carry incompatible multi
+// implementations — pre-relay wire framing and pre-rework flows — so every multi_live
+// surface (start, end, and the WS upgrade in ws.rs) refuses anything below it.
+// 4 = multi-live over the self-hosted WS relay (permanent co-op).
+pub const PROTOCOL_VERSION: u32 = 4;
+
+fn protocol_too_old(req: &HttpRequest) -> bool {
+    global::client_protocol_version(req) < PROTOCOL_VERSION
+}
+
+fn const_value(id: &str, default: i64) -> i64 {
+    let raw = &databases::CONST[id]["value"];
+    raw.as_str()
+        .and_then(|v| v.parse::<i64>().ok())
+        .or_else(|| raw.as_i64())
+        .unwrap_or(default)
+}
+
+pub fn boost_lp(live_boost: i64) -> i64 {
+    databases::LIVE_BOOST[live_boost.to_string()]["lp"]
+        .as_i64()
+        .unwrap_or(10 * live_boost)
+}
+
+fn boost_event_point_ratio(live_boost: i64) -> i64 {
+    databases::LIVE_BOOST[live_boost.to_string()]["eventPointRatio"]
+        .as_i64()
+        .unwrap_or(RATIO_ONE * live_boost.max(1))
+}
+
+// MusicLevelMst._fullCombo — the note count both client ratio checks divide by.
+fn note_count(master_live_id: i64, level: i64) -> Option<i64> {
+    let music_id = databases::LIVE_LIST[master_live_id.to_string()]["masterMusicId"].as_i64()?;
+    let row = &databases::MUSIC_LEVEL[format!("{}_{}", music_id, level)];
+    if row.is_empty() {
+        return None;
+    }
+    let notes = row["fullCombo"].as_i64()?;
+    if notes <= 0 { None } else { Some(notes) }
+}
+
+// Aoharu.MultiUtil.IsPenalty / IsHalved, evaluated server-side because
+// is_penalty_miss_ratio is what the client actually obeys (both MultiUtil helpers
+// are unreferenced in the client — they were only ever a local preview).
+//
+//   IsPenalty: (MULTI_PENALTY_MISS_RATIO / 100) * fullCombo <= miss
+//   IsHalved:  perfect + great < (MULTI_EVENT_LIVE_GREAT_PERFECT_NOTES_MIN_RATIO / 100) * fullCombo
+//              (skipped for LIVE_LEVEL 1, per `if ((int)level == 1) return false;`)
+//
+// MultiUtil.IsHalved reads Perfect + Good, but only because the client-side
+// MultiLiveResultProtocolData(userId, LiveScore, bool) ctor never assigns Great
+// (IL2CPP @4769631) — it has no great count to use. The const is named
+// ..._GREAT_PERFECT_NOTES_MIN_RATIO and the server does receive the full LiveScore,
+// so perfect + great is used here.
+//
+// MULTI_PENALTY_NO_PLAY_MISS_RATIO (5000) is unreachable as a real miss ratio and is
+// the value the ratio takes when nothing was judged at all: a client that never played
+// reports 0 misses, which the 70% rule would wave through.
+//
+// Both checks mirror MultiUtil's "missing MusicLevelMst row => false" shape.
+fn multi_live_end_status(body: &JsonValue) -> u8 {
+    let score = &body["live_score"];
+    let notes = match note_count(
+        body["master_live_id"].as_i64().unwrap_or(0),
+        body["level"].as_i64().unwrap_or(0)
+    ) {
+        Some(n) => n,
+        None => return STATUS_NONE
+    };
+
+    let perfect = score["perfect"].as_i64().unwrap_or(0);
+    let great = score["great"].as_i64().unwrap_or(0);
+    let good = score["good"].as_i64().unwrap_or(0);
+    let bad = score["bad"].as_i64().unwrap_or(0);
+    let miss = score["miss"].as_i64().unwrap_or(0);
+
+    let penalty_ratio = const_value("MULTI_PENALTY_MISS_RATIO", 70);
+    let no_play_ratio = const_value("MULTI_PENALTY_NO_PLAY_MISS_RATIO", 5000);
+
+    let judged = perfect + great + good + bad + miss;
+    let penalised = if judged == 0 {
+        no_play_ratio >= penalty_ratio
+    } else {
+        miss * 100 >= penalty_ratio * notes
+    };
+    if penalised {
+        return STATUS_MISS_RATIO_PENALTY;
+    }
+
+    if body["level"].as_i64().unwrap_or(0) != 1 {
+        let min_ratio = const_value("MULTI_EVENT_LIVE_GREAT_PERFECT_NOTES_MIN_RATIO", 50);
+        if (perfect + great) * 100 < min_ratio * notes {
+            return STATUS_GREAT_PERFECT_LOW_RATIO;
+        }
+    }
+
+    STATUS_NONE
+}
+
+// The event-point yield of one multi live, from event_score.csv (Shock.EventScoreMst).
+//
+// Neither ew nor the reconstructed client had an existing consumer to copy: EventData
+// exposes _eventLivePointBase / _eventPointRatio / _eventBoostRatio as EventLiveBasePoint
+// / EventPointRatio / EventBoostRatio (EventData.cs:134-156) but nothing in the client
+// ever reads those three properties — the award has always been computed server-side.
+// The interpretation used here is the one the field names and the client's own ratio
+// convention dictate, and the one this port is specified against:
+//
+//   points = _eventLivePointBase
+//          * _eventPointRatio  / RATIO_DIVISOR      (per-event scaling)
+//          * _eventBoostRatio  / RATIO_DIVISOR      (per-event boost worth)
+//          * live_boost._eventPointRatio / RATIO_DIVISOR   (the boost actually spent)
+//
+// The last factor mirrors LiveBoostMst.GetEventPointRatio (LiveBoostMst.cs:131-137),
+// which is `_eventPointRatio / RATIO_DIVISOR` — the boost level itself for the stock
+// table (boost 3 -> 30000/10000 -> 3).
+//
+// All four multi events (108/111/115/119) carry base 10, pointRatio 10000, boostRatio
+// 35000, so one boost-1 multi live is worth 35 points.
+//
+// Division is deferred to the end so the x3.5 boost ratio does not truncate to x3 the
+// way the client's integer GetEventPointRatio would.
+fn event_live_points(event_id: u32, live_boost: i64) -> i64 {
+    let row = &databases::EVENT_SCORE[event_id.to_string()];
+    if row.is_empty() {
+        // Should be unreachable: event_score.csv has a row for every event, including
+        // all four multi events. An event with no row is worth nothing rather than
+        // silently falling back to an invented constant.
+        println!("multi_live: no event_score row for event {event_id}, awarding 0 event points");
+        return 0;
+    }
+    let base = row["eventLivePointBase"].as_i64().unwrap_or(0);
+    let point_ratio = row["eventPointRatio"].as_i64().unwrap_or(0);
+    let boost_ratio = row["eventBoostRatio"].as_i64().unwrap_or(0);
+
+    base * point_ratio * boost_ratio * boost_event_point_ratio(live_boost)
+        / (RATIO_ONE * RATIO_ONE * RATIO_ONE)
+}
+
+// The stamina this live actually cost, as recorded by /multi_live/start. This is what
+// live_end_ex scales every reward off, and it is deliberately read without reference to
+// the backing event: a closed event suppresses scoring, never rewards.
+fn recorded_lp(started: Option<&JsonValue>) -> i64 {
+    let live_boost = started.and_then(|s| s["live_boost"].as_i64()).unwrap_or(0);
+    started
+        .and_then(|s| s["use_lp"].as_i64())
+        .unwrap_or_else(|| boost_lp(live_boost))
+        .max(0)
+}
+
+// The event a multi live should actually score against, or None when it should score
+// against nothing.
+//
+// Multi is a permanent feature here, entered from a client-side button rather than from
+// a live event, so the client faithfully sends the backing event id (108) even though
+// that event is closed and stays closed by choice. Awarding against a closed event would
+// write event points and ranking rows for a season that is not running, so the whole
+// event-point path stays dormant — and lights up on its own, with no further change
+// here, if an event is ever actually opened.
+//
+// Nothing else about the live is affected: rewards, EXP, bond, missions and the response
+// shape all come out of live_end_ex exactly as they do for an in-session event.
+fn scoring_event(started: Option<&JsonValue>, now: u64) -> Option<u32> {
+    started
+        .and_then(|s| s["master_event_id"].as_u32())
+        .filter(|id| *id != 0)
+        .filter(|id| event::is_in_session(*id, now))
+}
+
+// The whole award for one multi live: the event_score yield, the finishing-position
+// bonus from multievent_rankbonus, and the GREAT_PERFECT_LOW_RATIO halving.
+fn multi_event_points(event_id: u32, live_boost: i64, players: i64, live_rank: i64, status: u8) -> i64 {
+    let mut points = event_live_points(event_id, live_boost);
+    points = points * (RATIO_ONE + rank_bonus(players, live_rank)) / RATIO_ONE;
+    if status == STATUS_GREAT_PERFECT_LOW_RATIO {
+        // MultiUtil calls this state "halved" — the caution dialog goes with a
+        // reduced yield, not a forfeited one.
+        points /= 2;
+    }
+    points
+}
+
+// multievent_rankbonus._eventPtBonus for this party size / finishing position.
+// The table only covers 2-4 players with liveRank <= playerCount; anything outside
+// it (a solo room, a rank the table has no row for) simply earns no bonus.
+fn rank_bonus(player_count: i64, live_rank: i64) -> i64 {
+    databases::MULTIEVENT_RANK_BONUS[format!("{}_{}", player_count, live_rank)]["eventPtBonus"]
+        .as_i64()
+        .unwrap_or(0)
+}
+
+// LiveScene.MultiTask4 builds other_live_score_list from MultiPlayManager.AllPlayers,
+// so the poster is already one of its entries. Fall back to len + 1 if a caller ever
+// sends a list that genuinely excludes itself.
+fn player_count(body: &JsonValue, user_id: i64) -> i64 {
+    let list = &body["other_live_score_list"];
+    let contains_self = list
+        .members()
+        .any(|s| s["user_id"].as_i64() == Some(user_id));
+    let len = list.len() as i64;
+    if contains_self { len } else { len + 1 }
+}
+
+// Every field of Shock.RecvMultiLiveEndRData, so the penalty path still deserialises
+// cleanly. The client reads user/stamina and then returns on status 1, but Notify()
+// runs over the whole payload first.
+fn barren_response(user: &JsonValue, status: u8) -> JsonValue {
+    object!{
+        "is_penalty_miss_ratio": status,
+        "gem": user["gem"].clone(),
+        "clear_master_live_mission_ids": [],
+        "user": user["user"].clone(),
+        "stamina": user["stamina"].clone(),
+        "character_list": [],
+        "card_list": [],
+        "card_sub_list": [],
+        "item_list": [],
+        "point_list": [],
+        "group_list": [],
+        "reward_list": [],
+        "gift_list": [],
+        "clear_mission_ids": [],
+        "event_point_list": user["event_point_list"].clone(),
+        "event_point_reward_list": [],
+        "ranking_change": [],
+        "music_mission_reward_list": [],
+        "event_ranking_data": {
+            "event_point_rank": 0,
+            "next_reward_rank_point": 0,
+            "event_score_rank": 0,
+            "next_reward_rank_score": 0
+        }
+    }
+}
+
+// Unlike /live/start, a multi live pays its stamina up front: the response reports
+// consumed_stamina and the client never sends a boost with /multi_live/end. The
+// amount actually taken is stashed on the recorded start payload so /multi_live/end
+// can scale rewards off it without charging for it twice.
+async fn start(req: HttpRequest, Session { key, mut body }: Session) -> impl Responder {
+    // Older clients speak an incompatible multi — refuse before touching any state.
+    if protocol_too_old(&req) {
+        return Api(None);
+    }
+    // `token` is the room-party correlation key ("{userId}.{guid}") that all up to four
+    // party members post. It is recorded verbatim on the start record and nothing reads
+    // anything else out of it. Reconciling the party itself — checking the four results
+    // against each other — is still deferred.
+    // master_event_id is recorded verbatim and never validated here: multi is a permanent
+    // feature entered against a closed event (see scoring_event), so a closed — or absent
+    // — event must start a live exactly like an open one. Stamina comes off live_boost
+    // alone, so nothing on this path depends on the event being in session.
+    let live_boost = body["live_boost"].as_i64().unwrap_or(0);
+    let lp = boost_lp(live_boost).max(0);
+
+    let mut user = userdata::get_acc(&key);
+    // Settle regen first so the balance clamped against below is current.
+    items::lp_modification(&mut user, 0, true);
+    let available = user["stamina"]["stamina"].as_u64().unwrap_or(0);
+    // Clamped, not refused, and that IS the intended answer.
+    //
+    // The client gates on stamina at the entry to matching, never at the POST:
+    // MultiSelectionView.RoomCreation / OpenRoomSearchDialog and MultiRestart.RestartLive
+    // all run StaminaUtils.UseStaminaValue and divert to StaminaChargeScene when it says
+    // the balance is short, while MultiEventMatchingScene.ChangeScene — which is what
+    // actually calls SendMultiLiveStart, and does so off the host's _MoveScene RPC —
+    // computes the cost and drops the "insufficient" flag on the floor. Stamina only ever
+    // goes up between the gate and the POST (regen; the boost selector lives on the gated
+    // panels), so an honest client cannot arrive here short, and the official server was
+    // never asked what to do about it.
+    //
+    // So this is the unreachable-in-practice branch, and taking what is there is the
+    // benign resolution: the live still starts (a party of four must not be broken up by
+    // one member's balance), consumed_stamina reports what was really taken, and because
+    // every reward scales off that same recorded use_lp — see recorded_lp and live_end_ex —
+    // a short live pays out in proportion. Refusing would have to fail a live the other
+    // three players are already committed to; charging the full cost would mean inventing
+    // negative stamina.
+    let consumed = (lp as u64).min(available);
+    items::lp_modification(&mut user, consumed, true);
+    userdata::save_acc(&key, user);
+
+    body["use_lp"] = consumed.into();
+    live::start_live(&key, &body);
+
+    Api(Some(object!{
+        "consumed_stamina": consumed
+    }))
+}
+
+async fn end(req: HttpRequest, Session { key, body }: Session) -> impl Responder {
+    // Older clients speak an incompatible multi — refuse before touching any state
+    // (in particular before the start record can be consumed).
+    if protocol_too_old(&req) {
+        return Api(None);
+    }
+    // Loaded once and reused by every path that answers without playing the live; the
+    // live itself re-reads it, because live_end_ex saves the account.
+    let account = userdata::get_acc(&key);
+    // The user's own clock, so a time-travelling account sees the same event window the
+    // rest of the game shows it.
+    let uid = account["user"]["id"].as_i64().unwrap_or(0);
+
+    // A body with no live id is answered like a duplicate: it cannot name a start record
+    // (matching one on a null id would let it claim a record started with the same
+    // malformed body) and nothing downstream can score it.
+    if body["master_live_id"].as_i64().is_none() {
+        println!("multi_live/end: uid {} posted no master_live_id — nothing to end", uid);
+        return Api(Some(barren_response(&account, STATUS_NONE)));
+    }
+
+    // The started-live record is what makes an end legitimate, and it is CLAIMED here:
+    // take_started_live returns it and removes it in one transaction, before anything is
+    // awarded, so of N ends arriving together exactly one can proceed. The consumption
+    // used to be a side effect of get_end_live_deck_id deep inside live_end_ex — which
+    // only fired when the record carried a numeric deck_slot, and fired long after the
+    // award had been decided, so a re-POST could be paid twice over.
+    //
+    // Failing the take means this live was already ended: two clients signed in to the
+    // SAME account both POST /multi_live/end for the one shared record, or the client
+    // retried a request whose response it never saw. Granting again would double-count the
+    // clear, the clear-rate counter, the play-count mission and the flat 17001001 drop.
+    // So the duplicate is answered from current state: a well-formed result the client can
+    // display, awarding nothing.
+    let started = live::take_started_live(&key, &body);
+    let started = started.as_ref();
+    if started.is_none() {
+        println!("multi_live/end: uid {} has no start record to spend — answering barren", uid);
+        return Api(Some(barren_response(&account, STATUS_NONE)));
+    }
+
+    let live_boost = started.and_then(|s| s["live_boost"].as_i64()).unwrap_or(0);
+    let lp_used = recorded_lp(started);
+    let event_id = scoring_event(started, global::set_time(global::timestamp(), uid, false));
+
+    let status = multi_live_end_status(&body);
+    println!(
+        "multi_live/end: uid {} score {} miss-ratio status {} ({})",
+        uid,
+        body["live_score"]["score"].as_i64().unwrap_or(-1),
+        status,
+        match status {
+            STATUS_MISS_RATIO_PENALTY => "PENALTY — results voided",
+            2 => "great/perfect low — points halved",
+            _ => "ok",
+        }
+    );
+
+    if status == STATUS_MISS_RATIO_PENALTY {
+        // The client discards the result and leaves the room, so nothing is granted. The
+        // record is already gone (claimed above), so the live is not left hanging until it
+        // expires either — and a re-POST of the same penalised result lands on the
+        // no-record branch rather than back here.
+        return Api(Some(barren_response(&account, status)));
+    }
+
+    // /multi_live/end carries neither live_boost nor deck_slot; use_lp is what
+    // live_end scales exp / gold / bond / mission rewards off.
+    let mut end_body = body.clone();
+    end_body["use_lp"] = lp_used.into();
+    if end_body["deck_slot"].is_null() {
+        if let Some(slot) = started.and_then(|s| s["deck_slot"].as_i32()) {
+            end_body["deck_slot"] = slot.into();
+        }
+    }
+
+    // A multi live scores like the official server did: no high score, no score board —
+    // the client's own result screen says so. Private (join-by-code) parties are no
+    // exception (Ethan 2026-08-12; an earlier build recorded private-party scores, and
+    // the room-privacy plumbing that told the two apart left with that behaviour). The
+    // clear count and max combo still record either way — the live really was played.
+    let mut rv = live::live_end_ex(&req, &key, &end_body, false, false, false);
+
+    rv["is_penalty_miss_ratio"] = status.into();
+    // Fields RecvMultiLiveEndRData declares that live_end does not emit.
+    rv["card_list"] = jzon::array![];
+    rv["card_sub_list"] = jzon::array![];
+    rv["group_list"] = jzon::array![];
+    rv["music_mission_reward_list"] = jzon::array![];
+    // MngLiveData.SendMultiLiveEnd dereferences event_ranking_data unconditionally,
+    // so it must be an object even when this live belongs to no event.
+    rv["event_ranking_data"] = object!{
+        "event_point_rank": 0,
+        "next_reward_rank_point": 0,
+        "event_score_rank": 0,
+        "next_reward_rank_score": 0
+    };
+
+    if let Some(event_id) = event_id {
+        // live_end already saved the account; re-read it before touching event points.
+        let mut user = userdata::get_acc(&key);
+        let user_id = user["user"]["id"].as_i64().unwrap_or(0);
+
+        let players = player_count(&body, user_id);
+        let live_rank = body["multi_live_rank"].as_i64().unwrap_or(0);
+
+        let points = multi_event_points(event_id, live_boost, players, live_rank, status);
+
+        event::give_event_points(event_id, points, &mut user);
+        userdata::save_acc(&key, user.clone());
+
+        let total = event::get_points(event_id, &user);
+        event_ranking::live_completed(event_id, user_id, total, 0);
+        let rank = event::get_rank(event_id, user_id as u64);
+
+        let mut event = event::get_event_data(&key, event_id);
+        event["point_ranking"]["point"] = total.into();
+        event["point_ranking"]["rank"] = rank.into();
+        event::save_event_data(&key, event_id, event);
+
+        rv["event_point_list"] = user["event_point_list"].clone();
+        rv["event_ranking_data"] = object!{
+            "event_point_rank": rank,
+            "next_reward_rank_point": 0,
+            "event_score_rank": rank,
+            "next_reward_rank_score": 0
+        };
+    }
+
+    Api(Some(rv))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use super::proto::{ClientMsg, Map, Value};
+    use jzon::array;
+    use std::time::Instant;
+
+    const STOCK_LIVE_ID: i64 = 1100101;
+
+    #[test]
+    fn multi_consts_resolve_from_masterdata() {
+        assert_eq!(const_value("MULTI_PENALTY_MISS_RATIO", -1), 70);
+        assert_eq!(const_value("MULTI_PENALTY_NO_PLAY_MISS_RATIO", -1), 5000);
+        assert_eq!(const_value("MULTI_EVENT_LIVE_GREAT_PERFECT_NOTES_MIN_RATIO", -1), 50);
+        assert_eq!(const_value("NOT_A_CONST", -1), -1);
+    }
+
+    #[test]
+    fn boost_costs_come_from_live_boost() {
+        assert_eq!(boost_lp(1), 10);
+        assert_eq!(boost_lp(10), 100);
+        assert_eq!(boost_event_point_ratio(1), RATIO_ONE);
+        assert_eq!(boost_event_point_ratio(3), 3 * RATIO_ONE);
+    }
+
+    // The four multi events from multievent_setting.csv, all sharing one event_score row
+    // shape: _eventLivePointBase 10, _eventPointRatio 10000, _eventBoostRatio 35000.
+    const MULTI_EVENTS: [u32; 4] = [108, 111, 115, 119];
+
+    #[test]
+    fn event_score_rows_back_every_multi_event() {
+        for event_id in MULTI_EVENTS {
+            let row = &databases::EVENT_SCORE[event_id.to_string()];
+            assert!(!row.is_empty(), "event_score row missing for event {event_id}");
+            assert_eq!(row["eventLivePointBase"].as_i64(), Some(10));
+            assert_eq!(row["eventPointRatio"].as_i64(), Some(RATIO_ONE));
+            assert_eq!(row["eventBoostRatio"].as_i64(), Some(35000));
+        }
+    }
+
+    #[test]
+    fn event_live_points_derive_from_event_score() {
+        // 10 * (10000/10000) * (35000/10000) * boost — and the x3.5 must not truncate
+        // to x3 on the way through.
+        assert_eq!(event_live_points(108, 1), 35);
+        assert_eq!(event_live_points(108, 2), 70);
+        assert_eq!(event_live_points(108, 10), 350);
+        for event_id in MULTI_EVENTS {
+            assert_eq!(event_live_points(event_id, 1), 35);
+        }
+    }
+
+    #[test]
+    fn event_live_points_fall_back_to_zero_without_a_row() {
+        assert!(databases::EVENT_SCORE["99999"].is_empty());
+        assert_eq!(event_live_points(99999, 1), 0);
+        assert_eq!(multi_event_points(99999, 1, 4, 1, STATUS_NONE), 0);
+    }
+
+    #[test]
+    fn multi_event_points_layer_rank_bonus_and_halving() {
+        // 1st of 4 is +30% (multievent_rankbonus 4/1 = 3000).
+        assert_eq!(multi_event_points(108, 1, 4, 1, STATUS_NONE), 45);
+        // Last place earns the flat yield.
+        assert_eq!(multi_event_points(108, 1, 4, 4, STATUS_NONE), 35);
+        // The caution state halves whatever the bonus produced.
+        assert_eq!(multi_event_points(108, 1, 4, 1, STATUS_GREAT_PERFECT_LOW_RATIO), 22);
+        assert_eq!(multi_event_points(108, 1, 4, 4, STATUS_GREAT_PERFECT_LOW_RATIO), 17);
+    }
+
+    // release_label 223061504, event 108's window: 2023/06/19 05:00:00 - 2023/06/28 04:59:59.
+    fn during_multi_event_108() -> u64 {
+        global::parse_datetime("2023/06/20 12:00:00").unwrap()
+    }
+
+    #[test]
+    fn masterdata_datetimes_round_trip() {
+        let t = global::parse_datetime("2023/06/19 5:00:00").unwrap();
+        assert_eq!(global::format_datetime(t), "2023-06-19 05:00:00");
+        // A bare date is midnight, and the blank cells the evergreen label uses parse
+        // to nothing rather than to the epoch.
+        assert_eq!(
+            global::parse_datetime("2023/06/19"),
+            global::parse_datetime("2023/06/19 0:00:00")
+        );
+        assert_eq!(global::parse_datetime(""), None);
+        assert_eq!(global::parse_datetime("null"), None);
+    }
+
+    #[test]
+    fn the_multi_backing_event_is_closed_by_design() {
+        // The evergreen label has no window at all and is always open.
+        assert!(event::release_label_is_open(1, during_multi_event_108()));
+
+        // Event 108 is in session only inside its own long-past label window...
+        assert!(event::is_in_session(108, during_multi_event_108()));
+        // ...and is closed now, which is the permanent-feature state multi runs in.
+        // global::timestamp() rather than set_time: set_time reads crate::get_args(),
+        // whose clap parser chokes on the test-harness filter argument.
+        let now = global::timestamp();
+        assert!(!event::is_in_session(108, now), "event 108 must stay closed");
+        for event_id in MULTI_EVENTS {
+            assert!(!event::is_in_session(event_id, now));
+        }
+    }
+
+    #[test]
+    fn a_closed_backing_event_scores_against_nothing() {
+        let started = object!{ master_event_id: 108, live_boost: 1 };
+
+        // Closed today: the whole event-point path is skipped.
+        // global::timestamp() rather than set_time: set_time reads crate::get_args(),
+        // whose clap parser chokes on the test-harness filter argument.
+        let now = global::timestamp();
+        assert_eq!(scoring_event(Some(&started), now), None);
+
+        // But the gate is a window test, not a hardcoded off switch — open the event
+        // and scoring resumes on its own.
+        assert_eq!(scoring_event(Some(&started), during_multi_event_108()), Some(108));
+
+        // A live with no backing event at all, and a missing start record, score nothing.
+        assert_eq!(scoring_event(Some(&object!{ master_event_id: 0 }), during_multi_event_108()), None);
+        assert_eq!(scoring_event(None, during_multi_event_108()), None);
+    }
+
+    // The end-to-end path cannot be exercised here: live_end_ex calls items::get_region,
+    // which reaches crate::get_args(), whose clap parser rejects the test harness's own
+    // filter argument. (live.rs's tests avoid live_end for the same reason.) What is
+    // testable, and what actually matters, is that the reward input is derived with no
+    // reference to the event window — so a closed event can only ever suppress scoring.
+    #[test]
+    fn a_closed_event_still_pays_its_normal_rewards() {
+        let started = object!{ master_event_id: 108, live_boost: 1, use_lp: 10, deck_slot: 2 };
+        let open = during_multi_event_108();
+        // global::timestamp() rather than set_time: set_time reads crate::get_args(),
+        // whose clap parser chokes on the test-harness filter argument.
+        let closed = global::timestamp();
+
+        // The event gate is the only thing that moves between the two.
+        assert_eq!(scoring_event(Some(&started), open), Some(108));
+        assert_eq!(scoring_event(Some(&started), closed), None);
+
+        // The reward input is identical either way, and identical to what an eventless
+        // live would get for the same boost.
+        assert_eq!(recorded_lp(Some(&started)), 10);
+        assert_eq!(recorded_lp(Some(&object!{ live_boost: 1, use_lp: 10 })), 10);
+        // A start record with no recorded charge still falls back to the boost's cost.
+        assert_eq!(recorded_lp(Some(&object!{ master_event_id: 108, live_boost: 3 })), 30);
+        assert_eq!(recorded_lp(None), 0);
+
+        // And a suppressed event awards nothing, where an open one would pay 35.
+        assert_eq!(multi_event_points(108, 1, 4, 4, STATUS_NONE), 35);
+    }
+
+    // --- duplicate protection (the claim that gates the award) ----------------------
+    //
+    // /multi_live/end awards if and only if take_started_live hands it the record, and the
+    // record can be handed out exactly once. These drive that claim directly: the handler
+    // itself cannot be called from a test (live_end_ex reaches items::get_region, which
+    // reaches crate::get_args(), whose clap parser rejects the harness's own arguments).
+
+    // Two clients signed in to one account share a single started-live record, so the
+    // second /multi_live/end arrives after the first consumed it. The handler answers that
+    // from current state and grants nothing; this pins the state machine it keys off.
+    #[test]
+    fn a_second_end_for_one_session_finds_no_record_to_spend() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let token = "multi_duplicate_end";
+
+        let start_body = object!{
+            master_live_id: STOCK_LIVE_ID,
+            level: 4,
+            deck_slot: 1,
+            live_boost: 1,
+            master_event_id: 108,
+            use_lp: 10
+        };
+        live::start_live(token, &start_body);
+
+        // First end: the record is there and pays for the live, and claiming it is what
+        // the handler does BEFORE it awards anything.
+        let started = live::take_started_live(token, &start_body);
+        assert!(started.is_some());
+        assert_eq!(recorded_lp(started.as_ref()), 10);
+
+        // Second end: nothing left to spend, which is the duplicate signal the handler
+        // short-circuits on, and the reward scale is zero even if it did not.
+        let again = live::take_started_live(token, &start_body);
+        assert!(again.is_none(), "the record must not survive the first end");
+        assert_eq!(recorded_lp(again.as_ref()), 0);
+        assert_eq!(scoring_event(again.as_ref(), during_multi_event_108()), None);
+        // And it stays gone however many times the client re-POSTs.
+        assert!(live::take_started_live(token, &start_body).is_none());
+        assert!(live::get_started_live(token, &start_body).is_none());
+    }
+
+    // The consumption used to hide inside get_end_live_deck_id, behind
+    // `record["deck_slot"].as_i32()?` — a start whose body carried no numeric deck_slot
+    // left the record in place, so every re-POST awarded again. Claiming is now about the
+    // record's existence and nothing else.
+    #[test]
+    fn a_start_with_no_deck_slot_is_still_consumed_by_the_first_end() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let token = "multi_no_deck_slot";
+
+        for start_body in [
+            // No deck_slot at all...
+            object!{ master_live_id: STOCK_LIVE_ID, level: 4, live_boost: 1, use_lp: 10 },
+            // ...and one that is present but not a number.
+            object!{ master_live_id: STOCK_LIVE_ID, level: 4, live_boost: 1, use_lp: 10, deck_slot: "1" }
+        ] {
+            live::start_live(token, &start_body);
+            let first = live::take_started_live(token, &start_body);
+            assert!(first.is_some(), "the record must be claimable without a deck_slot");
+            assert_eq!(recorded_lp(first.as_ref()), 10);
+
+            let second = live::take_started_live(token, &start_body);
+            assert!(second.is_none(), "a re-POST must find nothing left to award off");
+        }
+    }
+
+    // Two ends landing together — the normal case for one account signed in twice, and
+    // the one the old shape got wrong: both read the record, both passed the guard, both
+    // awarded. The claim is a single transaction, so exactly one of any number of racing
+    // ends can proceed.
+    #[test]
+    fn concurrent_ends_claim_the_record_exactly_once() {
+        let _lock = crate::runtime::lock_test_data_path();
+        let token = "multi_concurrent_end";
+
+        let start_body = object!{
+            master_live_id: STOCK_LIVE_ID,
+            level: 4,
+            deck_slot: 1,
+            live_boost: 1,
+            master_event_id: 108,
+            use_lp: 10
+        };
+        // Create the account before the threads start: the claim itself is atomic, the
+        // lazy account creation behind it is not, and that is not what is under test.
+        live::start_live(token, &start_body);
+
+        let claims = std::sync::atomic::AtomicUsize::new(0);
+        std::thread::scope(|s| {
+            for _ in 0..8 {
+                s.spawn(|| {
+                    if live::take_started_live(token, &start_body).is_some() {
+                        claims.fetch_add(1, std::sync::atomic::Ordering::SeqCst);
+                    }
+                });
+            }
+        });
+
+        assert_eq!(
+            claims.load(std::sync::atomic::Ordering::SeqCst),
+            1,
+            "exactly one of eight simultaneous ends may award"
+        );
+        assert!(live::get_started_live(token, &start_body).is_none());
+    }
+
+    #[test]
+    fn rank_bonus_matches_multievent_rankbonus() {
+        assert_eq!(rank_bonus(4, 1), 3000);
+        assert_eq!(rank_bonus(4, 4), 0);
+        assert_eq!(rank_bonus(2, 1), 1000);
+        // Rows the table does not cover earn nothing rather than panicking.
+        assert_eq!(rank_bonus(1, 1), 0);
+        assert_eq!(rank_bonus(4, 9), 0);
+    }
+
+    fn score(perfect: i64, great: i64, good: i64, bad: i64, miss: i64) -> JsonValue {
+        object!{
+            master_live_id: STOCK_LIVE_ID,
+            level: 4,
+            live_score: {
+                perfect: perfect, great: great, good: good, bad: bad, miss: miss
+            }
+        }
+    }
+
+    #[test]
+    fn end_status_follows_multiutil_ratios() {
+        let notes = note_count(STOCK_LIVE_ID, 4).expect("music_level row");
+
+        // A clean full combo is normal.
+        assert_eq!(multi_live_end_status(&score(notes, 0, 0, 0, 0)), STATUS_NONE);
+
+        // 70% or more of the notes missed trips the penalty.
+        assert_eq!(multi_live_end_status(&score(0, 0, 0, 0, notes)), STATUS_MISS_RATIO_PENALTY);
+
+        // Nothing judged at all is the "no play" case the 70% rule would wave through.
+        assert_eq!(multi_live_end_status(&score(0, 0, 0, 0, 0)), STATUS_MISS_RATIO_PENALTY);
+
+        // Under half the notes as perfect/great, but few enough misses to avoid the
+        // penalty, is the caution ("halved") state.
+        let goods = notes - (notes / 4) - 1;
+        assert_eq!(
+            multi_live_end_status(&score(notes / 4, 0, goods, 0, 1)),
+            STATUS_GREAT_PERFECT_LOW_RATIO
+        );
+
+        // LIVE_LEVEL 1 is exempt from the great/perfect check.
+        let mut beginner = score(0, 0, 0, 0, 0);
+        beginner["level"] = 1.into();
+        beginner["live_score"]["good"] = note_count(STOCK_LIVE_ID, 1).unwrap().into();
+        assert_eq!(multi_live_end_status(&beginner), STATUS_NONE);
+
+        // A live with no MusicLevelMst row never penalises, like MultiUtil.
+        let mut unknown = score(0, 0, 0, 0, 0);
+        unknown["master_live_id"] = 999999999i64.into();
+        assert_eq!(multi_live_end_status(&unknown), STATUS_NONE);
+    }
+
+    #[test]
+    fn player_count_does_not_double_count_the_poster() {
+        let body = object!{
+            other_live_score_list: array![
+                object!{ user_id: 7 },
+                object!{ user_id: 8 },
+                object!{ user_id: 9 }
+            ]
+        };
+        // LiveScene includes the poster in the list.
+        assert_eq!(player_count(&body, 8), 3);
+        // A list that omits the poster still yields the real party size.
+        assert_eq!(player_count(&body, 42), 4);
+    }
+}

src/router/multi_live/proto.rs

@@ -0,0 +1,970 @@
+// Wire format for the multi-live WebSocket relay, per docs/multi-live-ws-protocol.md.
+//
+// The C# client rewrite encodes/decodes the exact same bytes, so this module is a
+// straight transcription of the spec tables rather than idiomatic Rust: every field is
+// written in declaration order, all integers are little-endian, strings are UTF-8 behind
+// a u16 length, and counts are u8. Nothing here is serde-driven - the type tags mirror
+// Photon's Hashtable boxing (an Int32 must arrive as Int32 or GetCurrentRoomEventId's
+// exact `is int` check fails), and a derive would hide that.
+//
+// Both directions are implemented in both halves (encode + decode for client messages
+// AND for server messages) even though the relay only ever decodes the former and
+// encodes the latter. The unused halves are what the round-trip tests exercise, and they
+// double as the reference the C# side is written against.
+
+use std::fmt;
+
+// ---------------------------------------------------------------------------
+// Constants
+// ---------------------------------------------------------------------------
+
+// Value tags (see "Value encoding" in the spec).
+pub const TAG_NULL: u8 = 0;
+pub const TAG_INT: u8 = 1;
+pub const TAG_STRING: u8 = 2;
+pub const TAG_BOOL: u8 = 3;
+pub const TAG_DOUBLE: u8 = 4;
+
+// Client -> server opcodes.
+pub const OP_AUTH: u8 = 1;
+pub const OP_JOIN_LOBBY: u8 = 2;
+pub const OP_LEAVE_LOBBY: u8 = 3;
+pub const OP_CREATE_ROOM: u8 = 4;
+pub const OP_JOIN_ROOM: u8 = 5;
+pub const OP_JOIN_RANDOM: u8 = 6;
+pub const OP_LEAVE_ROOM: u8 = 7;
+pub const OP_REJOIN: u8 = 8;
+pub const OP_SET_PLAYER_PROPS: u8 = 9;
+pub const OP_SET_ROOM_PROPS: u8 = 10;
+pub const OP_RPC: u8 = 11;
+pub const OP_PING: u8 = 12;
+
+// Server -> client opcodes.
+pub const OP_AUTH_OK: u8 = 20;
+pub const OP_JOINED_LOBBY: u8 = 21;
+pub const OP_LEFT_LOBBY: u8 = 22;
+pub const OP_JOINED_ROOM: u8 = 23;
+pub const OP_CREATE_FAILED: u8 = 24;
+pub const OP_JOIN_FAILED: u8 = 25;
+pub const OP_PLAYER_ENTERED: u8 = 26;
+pub const OP_PLAYER_LEFT: u8 = 27;
+pub const OP_LEFT_ROOM: u8 = 28;
+pub const OP_ROOM_PROPS_CHANGED: u8 = 29;
+pub const OP_PLAYER_PROPS_CHANGED: u8 = 30;
+pub const OP_MASTER_SWITCHED: u8 = 31;
+// Distinct name from the client-side OP_RPC (11); same message, opposite direction.
+pub const OP_RPC_BROADCAST: u8 = 32;
+pub const OP_PONG: u8 = 33;
+pub const OP_KICKED: u8 = 34;
+
+// Close codes. The spec names 4001 and 4002; 4000 covers the framing errors it
+// describes ("Text frames are a protocol error -> close", malformed frame, unknown
+// opcode) without naming a code for them.
+pub const CLOSE_PROTOCOL: u16 = 4000;
+pub const CLOSE_UNAUTHENTICATED: u16 = 4001;
+pub const CLOSE_RATE_LIMIT: u16 = 4002;
+// Added with the liveness sweep: nothing was heard from this connection for three ping
+// intervals, so the relay stops holding its seat. See LIVENESS_TIMEOUT in ws.rs.
+pub const CLOSE_IDLE_TIMEOUT: u16 = 4003;
+
+// Photon ErrorCode mirrors, so the client's existing logging keeps its meaning.
+pub const ERR_GAME_ID_ALREADY_EXISTS: i32 = 32766;
+pub const ERR_GAME_FULL: i32 = 32765;
+pub const ERR_GAME_CLOSED: i32 = 32764;
+pub const ERR_NO_RANDOM_MATCH_FOUND: i32 = 32760;
+pub const ERR_GAME_DOES_NOT_EXIST: i32 = 32758;
+
+// Kicked causes. A room only dies once nobody is left to be told, so cause 1 is still
+// reserved — encoded, decoded and tested so the C# side can be written against it now.
+#[allow(dead_code)]
+pub const KICK_ROOM_DESTROYED: i32 = 1;
+// Cause 2 is real: the liveness sweep sends it immediately before close 4003, so a client
+// that is alive enough to read (a suspended app coming back, a stalled network) can say
+// why it was dropped instead of showing a bare socket error.
+pub const KICK_IDLE_TIMEOUT: i32 = 2;
+
+// ---------------------------------------------------------------------------
+// Values and maps
+// ---------------------------------------------------------------------------
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum Value {
+    Null,
+    Int(i32),
+    Str(String),
+    Bool(bool),
+    Double(f64),
+}
+
+impl Value {
+    pub fn as_int(&self) -> Option<i32> {
+        match self {
+            Value::Int(v) => Some(*v),
+            _ => None,
+        }
+    }
+
+    pub fn as_str(&self) -> Option<&str> {
+        match self {
+            Value::Str(v) => Some(v),
+            _ => None,
+        }
+    }
+}
+
+// An ordered key -> value bag. Ordering is not semantically meaningful on the wire, but
+// keeping insertion order makes the changed-subset broadcasts arrive in the order the
+// sender wrote them, which is one less thing for the client to reason about (and makes
+// the tests deterministic).
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct Map(Vec<(String, Value)>);
+
+impl Map {
+    pub fn new() -> Self {
+        Map(Vec::new())
+    }
+
+    // Duplicate keys collapse last-writer-wins, exactly like the Hashtable this mirrors.
+    // Convenience for the tests and for any caller building a bag from scratch; the
+    // relay itself only ever merges into an existing bag.
+    #[allow(dead_code)]
+    pub fn from_pairs<I, K>(pairs: I) -> Self
+    where
+        I: IntoIterator<Item = (K, Value)>,
+        K: Into<String>,
+    {
+        let mut map = Map::new();
+        for (key, value) in pairs {
+            map.set(key, value);
+        }
+        map
+    }
+
+    pub fn get(&self, key: &str) -> Option<&Value> {
+        self.0.iter().find(|(k, _)| k == key).map(|(_, v)| v)
+    }
+
+    pub fn get_int(&self, key: &str) -> Option<i32> {
+        self.get(key).and_then(Value::as_int)
+    }
+
+    pub fn get_str(&self, key: &str) -> Option<&str> {
+        self.get(key).and_then(Value::as_str)
+    }
+
+    // Last-writer-wins in place: an existing key keeps its position.
+    pub fn set<K: Into<String>>(&mut self, key: K, value: Value) {
+        let key = key.into();
+        match self.0.iter_mut().find(|(k, _)| *k == key) {
+            Some(slot) => slot.1 = value,
+            None => self.0.push((key, value)),
+        }
+    }
+
+    // Last-writer-wins merge of `other` INTO self. The relay uses it for property updates
+    // and for seeding/merging a joiner's bag out of the seating op's `playerProps`.
+    pub fn merge(&mut self, other: &Map) {
+        for (key, value) in other.iter() {
+            self.set(key, value.clone());
+        }
+    }
+
+    pub fn len(&self) -> usize {
+        self.0.len()
+    }
+
+    #[allow(dead_code)]
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+
+    pub fn iter(&self) -> impl Iterator<Item = (&str, &Value)> {
+        self.0.iter().map(|(k, v)| (k.as_str(), v))
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Messages
+// ---------------------------------------------------------------------------
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum ClientMsg {
+    Auth { user_id: String, token: String },
+    JoinLobby { name: String },
+    LeaveLobby,
+    // `props` is the ROOM bag; `player_props` is the joiner's own bag, mirroring Photon's
+    // OpCreateRoom/OpJoinRoom actorProperties. See docs/multi-live-ws-protocol.md,
+    // "Player properties at join time".
+    CreateRoom {
+        name: String,
+        max_players: u8,
+        visible: bool,
+        open: bool,
+        props: Map,
+        lobby_prop_keys: Vec<String>,
+        player_props: Map,
+    },
+    JoinRoom { name: String, player_props: Map },
+    JoinRandom { power_min: i32, power_max: i32, levels: Vec<Value>, player_props: Map },
+    LeaveRoom,
+    Rejoin { name: String, player_props: Map },
+    SetPlayerProps { props: Map },
+    SetRoomProps { props: Map },
+    Rpc { name: String, params: Vec<Value> },
+    Ping,
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum ServerMsg {
+    AuthOk { actorless_time_ms: f64 },
+    JoinedLobby,
+    LeftLobby,
+    JoinedRoom {
+        room_name: String,
+        your_actor: i32,
+        master_actor: i32,
+        room_props: Map,
+        players: Vec<(i32, Map)>,
+    },
+    CreateFailed { code: i32, msg: String },
+    JoinFailed { code: i32, msg: String },
+    PlayerEntered { actor: i32, props: Map },
+    PlayerLeft { actor: i32, inactive: bool },
+    LeftRoom,
+    RoomPropsChanged { props: Map },
+    PlayerPropsChanged { actor: i32, props: Map },
+    MasterSwitched { new_master_actor: i32 },
+    Rpc { sender_actor: i32, name: String, params: Vec<Value> },
+    Pong { server_time_ms: f64 },
+    // Sent by the liveness sweep with KICK_IDLE_TIMEOUT; KICK_ROOM_DESTROYED is reserved.
+    Kicked { cause: i32 },
+}
+
+// ---------------------------------------------------------------------------
+// Decoding
+// ---------------------------------------------------------------------------
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum DecodeError {
+    // Frame ran out before the field did.
+    Truncated,
+    // Zero-length frame: there is not even an opcode.
+    Empty,
+    UnknownOp(u8),
+    UnknownTag(u8),
+    BadUtf8,
+    // "One frame = one message" - anything after the message is a framing bug.
+    TrailingBytes,
+}
+
+impl fmt::Display for DecodeError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            DecodeError::Truncated => write!(f, "truncated frame"),
+            DecodeError::Empty => write!(f, "empty frame"),
+            DecodeError::UnknownOp(op) => write!(f, "unknown opcode {}", op),
+            DecodeError::UnknownTag(tag) => write!(f, "unknown value tag {}", tag),
+            DecodeError::BadUtf8 => write!(f, "string is not valid utf-8"),
+            DecodeError::TrailingBytes => write!(f, "trailing bytes after message"),
+        }
+    }
+}
+
+struct Reader<'a> {
+    buf: &'a [u8],
+    pos: usize,
+}
+
+impl<'a> Reader<'a> {
+    fn new(buf: &'a [u8]) -> Self {
+        Reader { buf, pos: 0 }
+    }
+
+    fn take(&mut self, n: usize) -> Result<&'a [u8], DecodeError> {
+        let end = self.pos.checked_add(n).ok_or(DecodeError::Truncated)?;
+        if end > self.buf.len() {
+            return Err(DecodeError::Truncated);
+        }
+        let out = &self.buf[self.pos..end];
+        self.pos = end;
+        Ok(out)
+    }
+
+    fn u8(&mut self) -> Result<u8, DecodeError> {
+        Ok(self.take(1)?[0])
+    }
+
+    fn bool(&mut self) -> Result<bool, DecodeError> {
+        // Photon booleans are one byte; anything non-zero is true.
+        Ok(self.u8()? != 0)
+    }
+
+    fn u16(&mut self) -> Result<u16, DecodeError> {
+        let b = self.take(2)?;
+        Ok(u16::from_le_bytes([b[0], b[1]]))
+    }
+
+    fn i32(&mut self) -> Result<i32, DecodeError> {
+        let b = self.take(4)?;
+        Ok(i32::from_le_bytes([b[0], b[1], b[2], b[3]]))
+    }
+
+    fn f64(&mut self) -> Result<f64, DecodeError> {
+        let b = self.take(8)?;
+        Ok(f64::from_le_bytes([b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]]))
+    }
+
+    fn string(&mut self) -> Result<String, DecodeError> {
+        let len = self.u16()? as usize;
+        let bytes = self.take(len)?;
+        String::from_utf8(bytes.to_vec()).map_err(|_| DecodeError::BadUtf8)
+    }
+
+    fn value(&mut self) -> Result<Value, DecodeError> {
+        let tag = self.u8()?;
+        match tag {
+            TAG_NULL => Ok(Value::Null),
+            TAG_INT => Ok(Value::Int(self.i32()?)),
+            TAG_STRING => Ok(Value::Str(self.string()?)),
+            TAG_BOOL => Ok(Value::Bool(self.bool()?)),
+            TAG_DOUBLE => Ok(Value::Double(self.f64()?)),
+            other => Err(DecodeError::UnknownTag(other)),
+        }
+    }
+
+    fn map(&mut self) -> Result<Map, DecodeError> {
+        let count = self.u8()?;
+        let mut map = Map::new();
+        for _ in 0..count {
+            let key = self.string()?;
+            let value = self.value()?;
+            map.set(key, value);
+        }
+        Ok(map)
+    }
+
+    fn value_list(&mut self) -> Result<Vec<Value>, DecodeError> {
+        let count = self.u8()?;
+        let mut out = Vec::with_capacity(count as usize);
+        for _ in 0..count {
+            out.push(self.value()?);
+        }
+        Ok(out)
+    }
+
+    fn string_list(&mut self) -> Result<Vec<String>, DecodeError> {
+        let count = self.u8()?;
+        let mut out = Vec::with_capacity(count as usize);
+        for _ in 0..count {
+            out.push(self.string()?);
+        }
+        Ok(out)
+    }
+
+    fn finish<T>(&self, value: T) -> Result<T, DecodeError> {
+        if self.pos != self.buf.len() {
+            return Err(DecodeError::TrailingBytes);
+        }
+        Ok(value)
+    }
+}
+
+pub fn decode_client(buf: &[u8]) -> Result<ClientMsg, DecodeError> {
+    let mut r = Reader::new(buf);
+    let op = r.u8().map_err(|_| DecodeError::Empty)?;
+    let msg = match op {
+        OP_AUTH => ClientMsg::Auth { user_id: r.string()?, token: r.string()? },
+        OP_JOIN_LOBBY => ClientMsg::JoinLobby { name: r.string()? },
+        OP_LEAVE_LOBBY => ClientMsg::LeaveLobby,
+        OP_CREATE_ROOM => ClientMsg::CreateRoom {
+            name: r.string()?,
+            max_players: r.u8()?,
+            visible: r.bool()?,
+            open: r.bool()?,
+            props: r.map()?,
+            lobby_prop_keys: r.string_list()?,
+            player_props: r.map()?,
+        },
+        OP_JOIN_ROOM => ClientMsg::JoinRoom { name: r.string()?, player_props: r.map()? },
+        OP_JOIN_RANDOM => ClientMsg::JoinRandom {
+            power_min: r.i32()?,
+            power_max: r.i32()?,
+            levels: r.value_list()?,
+            player_props: r.map()?,
+        },
+        OP_LEAVE_ROOM => ClientMsg::LeaveRoom,
+        OP_REJOIN => ClientMsg::Rejoin { name: r.string()?, player_props: r.map()? },
+        OP_SET_PLAYER_PROPS => ClientMsg::SetPlayerProps { props: r.map()? },
+        OP_SET_ROOM_PROPS => ClientMsg::SetRoomProps { props: r.map()? },
+        OP_RPC => ClientMsg::Rpc { name: r.string()?, params: r.value_list()? },
+        OP_PING => ClientMsg::Ping,
+        other => return Err(DecodeError::UnknownOp(other)),
+    };
+    r.finish(msg)
+}
+
+// The client's half of the codec. The relay never calls it; it is the executable
+// reference the C# rewrite is written against, and what the round-trip tests drive.
+#[allow(dead_code)]
+pub fn decode_server(buf: &[u8]) -> Result<ServerMsg, DecodeError> {
+    let mut r = Reader::new(buf);
+    let op = r.u8().map_err(|_| DecodeError::Empty)?;
+    let msg = match op {
+        OP_AUTH_OK => ServerMsg::AuthOk { actorless_time_ms: r.f64()? },
+        OP_JOINED_LOBBY => ServerMsg::JoinedLobby,
+        OP_LEFT_LOBBY => ServerMsg::LeftLobby,
+        OP_JOINED_ROOM => {
+            let room_name = r.string()?;
+            let your_actor = r.i32()?;
+            let master_actor = r.i32()?;
+            let room_props = r.map()?;
+            let count = r.u8()?;
+            let mut players = Vec::with_capacity(count as usize);
+            for _ in 0..count {
+                let actor = r.i32()?;
+                players.push((actor, r.map()?));
+            }
+            ServerMsg::JoinedRoom { room_name, your_actor, master_actor, room_props, players }
+        }
+        OP_CREATE_FAILED => ServerMsg::CreateFailed { code: r.i32()?, msg: r.string()? },
+        OP_JOIN_FAILED => ServerMsg::JoinFailed { code: r.i32()?, msg: r.string()? },
+        OP_PLAYER_ENTERED => ServerMsg::PlayerEntered { actor: r.i32()?, props: r.map()? },
+        OP_PLAYER_LEFT => ServerMsg::PlayerLeft { actor: r.i32()?, inactive: r.bool()? },
+        OP_LEFT_ROOM => ServerMsg::LeftRoom,
+        OP_ROOM_PROPS_CHANGED => ServerMsg::RoomPropsChanged { props: r.map()? },
+        OP_PLAYER_PROPS_CHANGED => {
+            ServerMsg::PlayerPropsChanged { actor: r.i32()?, props: r.map()? }
+        }
+        OP_MASTER_SWITCHED => ServerMsg::MasterSwitched { new_master_actor: r.i32()? },
+        OP_RPC_BROADCAST => ServerMsg::Rpc {
+            sender_actor: r.i32()?,
+            name: r.string()?,
+            params: r.value_list()?,
+        },
+        OP_PONG => ServerMsg::Pong { server_time_ms: r.f64()? },
+        OP_KICKED => ServerMsg::Kicked { cause: r.i32()? },
+        other => return Err(DecodeError::UnknownOp(other)),
+    };
+    r.finish(msg)
+}
+
+// ---------------------------------------------------------------------------
+// Encoding
+// ---------------------------------------------------------------------------
+
+// The relay never legitimately produces a string past 64KiB or a count past 255 (keys
+// are one or two characters, rooms hold four players, RPC params are a handful of ints),
+// so encoding is infallible and the guards below only exist to keep a bug from emitting
+// a frame the peer would mis-frame. They log and clamp rather than panic in a handler.
+fn put_str(out: &mut Vec<u8>, s: &str) {
+    let mut bytes = s.as_bytes();
+    if bytes.len() > u16::MAX as usize {
+        println!("multi_live/ws: string of {} bytes truncated to fit u16 length", bytes.len());
+        let mut end = u16::MAX as usize;
+        while end > 0 && !s.is_char_boundary(end) {
+            end -= 1;
+        }
+        bytes = &s.as_bytes()[..end];
+    }
+    out.extend_from_slice(&(bytes.len() as u16).to_le_bytes());
+    out.extend_from_slice(bytes);
+}
+
+fn put_count(out: &mut Vec<u8>, count: usize, what: &str) -> usize {
+    let clamped = if count > u8::MAX as usize {
+        println!("multi_live/ws: {} count {} clamped to 255", what, count);
+        u8::MAX as usize
+    } else {
+        count
+    };
+    out.push(clamped as u8);
+    clamped
+}
+
+fn put_value(out: &mut Vec<u8>, value: &Value) {
+    match value {
+        Value::Null => out.push(TAG_NULL),
+        Value::Int(v) => {
+            out.push(TAG_INT);
+            out.extend_from_slice(&v.to_le_bytes());
+        }
+        Value::Str(v) => {
+            out.push(TAG_STRING);
+            put_str(out, v);
+        }
+        Value::Bool(v) => {
+            out.push(TAG_BOOL);
+            out.push(if *v { 1 } else { 0 });
+        }
+        Value::Double(v) => {
+            out.push(TAG_DOUBLE);
+            out.extend_from_slice(&v.to_le_bytes());
+        }
+    }
+}
+
+fn put_map(out: &mut Vec<u8>, map: &Map) {
+    let count = put_count(out, map.len(), "map");
+    for (key, value) in map.iter().take(count) {
+        put_str(out, key);
+        put_value(out, value);
+    }
+}
+
+fn put_value_list(out: &mut Vec<u8>, values: &[Value]) {
+    let count = put_count(out, values.len(), "value list");
+    for value in values.iter().take(count) {
+        put_value(out, value);
+    }
+}
+
+#[allow(dead_code)]
+fn put_string_list(out: &mut Vec<u8>, values: &[String]) {
+    let count = put_count(out, values.len(), "string list");
+    for value in values.iter().take(count) {
+        put_str(out, value);
+    }
+}
+
+// See decode_server: the client's half, kept honest by the round-trip tests.
+#[allow(dead_code)]
+pub fn encode_client(msg: &ClientMsg) -> Vec<u8> {
+    let mut out = Vec::new();
+    match msg {
+        ClientMsg::Auth { user_id, token } => {
+            out.push(OP_AUTH);
+            put_str(&mut out, user_id);
+            put_str(&mut out, token);
+        }
+        ClientMsg::JoinLobby { name } => {
+            out.push(OP_JOIN_LOBBY);
+            put_str(&mut out, name);
+        }
+        ClientMsg::LeaveLobby => out.push(OP_LEAVE_LOBBY),
+        ClientMsg::CreateRoom { name, max_players, visible, open, props, lobby_prop_keys, player_props } => {
+            out.push(OP_CREATE_ROOM);
+            put_str(&mut out, name);
+            out.push(*max_players);
+            out.push(if *visible { 1 } else { 0 });
+            out.push(if *open { 1 } else { 0 });
+            put_map(&mut out, props);
+            put_string_list(&mut out, lobby_prop_keys);
+            put_map(&mut out, player_props);
+        }
+        ClientMsg::JoinRoom { name, player_props } => {
+            out.push(OP_JOIN_ROOM);
+            put_str(&mut out, name);
+            put_map(&mut out, player_props);
+        }
+        ClientMsg::JoinRandom { power_min, power_max, levels, player_props } => {
+            out.push(OP_JOIN_RANDOM);
+            out.extend_from_slice(&power_min.to_le_bytes());
+            out.extend_from_slice(&power_max.to_le_bytes());
+            put_value_list(&mut out, levels);
+            put_map(&mut out, player_props);
+        }
+        ClientMsg::LeaveRoom => out.push(OP_LEAVE_ROOM),
+        ClientMsg::Rejoin { name, player_props } => {
+            out.push(OP_REJOIN);
+            put_str(&mut out, name);
+            put_map(&mut out, player_props);
+        }
+        ClientMsg::SetPlayerProps { props } => {
+            out.push(OP_SET_PLAYER_PROPS);
+            put_map(&mut out, props);
+        }
+        ClientMsg::SetRoomProps { props } => {
+            out.push(OP_SET_ROOM_PROPS);
+            put_map(&mut out, props);
+        }
+        ClientMsg::Rpc { name, params } => {
+            out.push(OP_RPC);
+            put_str(&mut out, name);
+            put_value_list(&mut out, params);
+        }
+        ClientMsg::Ping => out.push(OP_PING),
+    }
+    out
+}
+
+pub fn encode_server(msg: &ServerMsg) -> Vec<u8> {
+    let mut out = Vec::new();
+    match msg {
+        ServerMsg::AuthOk { actorless_time_ms } => {
+            out.push(OP_AUTH_OK);
+            out.extend_from_slice(&actorless_time_ms.to_le_bytes());
+        }
+        ServerMsg::JoinedLobby => out.push(OP_JOINED_LOBBY),
+        ServerMsg::LeftLobby => out.push(OP_LEFT_LOBBY),
+        ServerMsg::JoinedRoom { room_name, your_actor, master_actor, room_props, players } => {
+            out.push(OP_JOINED_ROOM);
+            put_str(&mut out, room_name);
+            out.extend_from_slice(&your_actor.to_le_bytes());
+            out.extend_from_slice(&master_actor.to_le_bytes());
+            put_map(&mut out, room_props);
+            let count = put_count(&mut out, players.len(), "player");
+            for (actor, props) in players.iter().take(count) {
+                out.extend_from_slice(&actor.to_le_bytes());
+                put_map(&mut out, props);
+            }
+        }
+        ServerMsg::CreateFailed { code, msg } => {
+            out.push(OP_CREATE_FAILED);
+            out.extend_from_slice(&code.to_le_bytes());
+            put_str(&mut out, msg);
+        }
+        ServerMsg::JoinFailed { code, msg } => {
+            out.push(OP_JOIN_FAILED);
+            out.extend_from_slice(&code.to_le_bytes());
+            put_str(&mut out, msg);
+        }
+        ServerMsg::PlayerEntered { actor, props } => {
+            out.push(OP_PLAYER_ENTERED);
+            out.extend_from_slice(&actor.to_le_bytes());
+            put_map(&mut out, props);
+        }
+        ServerMsg::PlayerLeft { actor, inactive } => {
+            out.push(OP_PLAYER_LEFT);
+            out.extend_from_slice(&actor.to_le_bytes());
+            out.push(if *inactive { 1 } else { 0 });
+        }
+        ServerMsg::LeftRoom => out.push(OP_LEFT_ROOM),
+        ServerMsg::RoomPropsChanged { props } => {
+            out.push(OP_ROOM_PROPS_CHANGED);
+            put_map(&mut out, props);
+        }
+        ServerMsg::PlayerPropsChanged { actor, props } => {
+            out.push(OP_PLAYER_PROPS_CHANGED);
+            out.extend_from_slice(&actor.to_le_bytes());
+            put_map(&mut out, props);
+        }
+        ServerMsg::MasterSwitched { new_master_actor } => {
+            out.push(OP_MASTER_SWITCHED);
+            out.extend_from_slice(&new_master_actor.to_le_bytes());
+        }
+        ServerMsg::Rpc { sender_actor, name, params } => {
+            out.push(OP_RPC_BROADCAST);
+            out.extend_from_slice(&sender_actor.to_le_bytes());
+            put_str(&mut out, name);
+            put_value_list(&mut out, params);
+        }
+        ServerMsg::Pong { server_time_ms } => {
+            out.push(OP_PONG);
+            out.extend_from_slice(&server_time_ms.to_le_bytes());
+        }
+        ServerMsg::Kicked { cause } => {
+            out.push(OP_KICKED);
+            out.extend_from_slice(&cause.to_le_bytes());
+        }
+    }
+    out
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn round_client(msg: ClientMsg) {
+        let bytes = encode_client(&msg);
+        let back = decode_client(&bytes).expect("client message decodes");
+        assert_eq!(back, msg);
+        assert_eq!(encode_client(&back), bytes);
+    }
+
+    fn round_server(msg: ServerMsg) {
+        let bytes = encode_server(&msg);
+        let back = decode_server(&bytes).expect("server message decodes");
+        assert_eq!(back, msg);
+        assert_eq!(encode_server(&back), bytes);
+    }
+
+    fn sample_map() -> Map {
+        Map::from_pairs(vec![
+            ("A", Value::Int(-7)),
+            ("B", Value::Str("ラブライブ".to_string())),
+            ("C", Value::Bool(true)),
+            ("D", Value::Double(0.5)),
+            ("E", Value::Null),
+        ])
+    }
+
+    #[test]
+    fn every_client_message_round_trips() {
+        round_client(ClientMsg::Auth { user_id: "12345".into(), token: "a-uuid".into() });
+        round_client(ClientMsg::JoinLobby { name: "MultiEventLobby_31".into() });
+        round_client(ClientMsg::LeaveLobby);
+        round_client(ClientMsg::CreateRoom {
+            name: "123456".into(),
+            max_players: 4,
+            visible: false,
+            open: true,
+            props: sample_map(),
+            lobby_prop_keys: vec!["C0".into(), "C1".into()],
+            player_props: sample_map(),
+        });
+        round_client(ClientMsg::JoinRoom {
+            name: "042719".into(),
+            player_props: sample_map(),
+        });
+        round_client(ClientMsg::JoinRandom {
+            power_min: 0,
+            power_max: i32::MAX,
+            levels: vec![Value::Int(1), Value::Int(4)],
+            player_props: sample_map(),
+        });
+        round_client(ClientMsg::LeaveRoom);
+        round_client(ClientMsg::Rejoin {
+            name: "1000000".into(),
+            player_props: sample_map(),
+        });
+        round_client(ClientMsg::SetPlayerProps { props: sample_map() });
+        round_client(ClientMsg::SetRoomProps { props: sample_map() });
+        round_client(ClientMsg::Rpc {
+            name: "SendStamp".into(),
+            params: vec![Value::Int(3), Value::Str("hi".into())],
+        });
+        round_client(ClientMsg::Ping);
+    }
+
+    #[test]
+    fn every_server_message_round_trips() {
+        round_server(ServerMsg::AuthOk { actorless_time_ms: 1_754_500_000_123.0 });
+        round_server(ServerMsg::JoinedLobby);
+        round_server(ServerMsg::LeftLobby);
+        round_server(ServerMsg::JoinedRoom {
+            room_name: "1000000".into(),
+            your_actor: 2,
+            master_actor: 1,
+            room_props: sample_map(),
+            players: vec![(1, sample_map()), (2, Map::new())],
+        });
+        round_server(ServerMsg::CreateFailed {
+            code: ERR_GAME_ID_ALREADY_EXISTS,
+            msg: "GameIdAlreadyExists".into(),
+        });
+        round_server(ServerMsg::JoinFailed { code: ERR_GAME_FULL, msg: "GameFull".into() });
+        round_server(ServerMsg::PlayerEntered { actor: 3, props: sample_map() });
+        round_server(ServerMsg::PlayerLeft { actor: 3, inactive: true });
+        round_server(ServerMsg::PlayerLeft { actor: 3, inactive: false });
+        round_server(ServerMsg::LeftRoom);
+        round_server(ServerMsg::RoomPropsChanged { props: sample_map() });
+        round_server(ServerMsg::PlayerPropsChanged { actor: 4, props: sample_map() });
+        round_server(ServerMsg::MasterSwitched { new_master_actor: 2 });
+        round_server(ServerMsg::Rpc {
+            sender_actor: 1,
+            name: "_MoveScene".into(),
+            params: vec![Value::Null],
+        });
+        round_server(ServerMsg::Pong { server_time_ms: -0.0 });
+        round_server(ServerMsg::Kicked { cause: KICK_ROOM_DESTROYED });
+    }
+
+    #[test]
+    fn empty_map_and_empty_strings_round_trip() {
+        round_client(ClientMsg::Auth { user_id: String::new(), token: String::new() });
+        round_client(ClientMsg::JoinLobby { name: String::new() });
+        round_client(ClientMsg::SetPlayerProps { props: Map::new() });
+        round_client(ClientMsg::Rpc { name: String::new(), params: Vec::new() });
+        round_client(ClientMsg::CreateRoom {
+            name: String::new(),
+            max_players: 0,
+            visible: true,
+            open: false,
+            props: Map::new(),
+            lobby_prop_keys: Vec::new(),
+            player_props: Map::new(),
+        });
+        // A joiner that has committed nothing yet sends an empty bag on every seating op.
+        round_client(ClientMsg::JoinRoom { name: String::new(), player_props: Map::new() });
+        round_client(ClientMsg::Rejoin { name: String::new(), player_props: Map::new() });
+        round_client(ClientMsg::JoinRandom {
+            power_min: 0,
+            power_max: 0,
+            levels: Vec::new(),
+            player_props: Map::new(),
+        });
+        // The trailing playerProps of a JoinRoom is exactly one byte when empty.
+        assert_eq!(
+            encode_client(&ClientMsg::JoinRoom { name: String::new(), player_props: Map::new() }),
+            vec![OP_JOIN_ROOM, 0, 0, 0]
+        );
+        round_server(ServerMsg::JoinedRoom {
+            room_name: String::new(),
+            your_actor: 1,
+            master_actor: 1,
+            room_props: Map::new(),
+            players: Vec::new(),
+        });
+        // An empty map is exactly one byte of payload.
+        assert_eq!(encode_client(&ClientMsg::SetRoomProps { props: Map::new() }), vec![OP_SET_ROOM_PROPS, 0]);
+    }
+
+    #[test]
+    fn max_u8_counts_round_trip() {
+        let map = Map::from_pairs((0..255).map(|i| (format!("k{}", i), Value::Int(i))));
+        assert_eq!(map.len(), 255);
+        round_client(ClientMsg::SetPlayerProps { props: map.clone() });
+
+        let params: Vec<Value> = (0..255).map(Value::Int).collect();
+        round_client(ClientMsg::Rpc { name: "SendStamp".into(), params });
+
+        let keys: Vec<String> = (0..255).map(|i| format!("k{}", i)).collect();
+        round_client(ClientMsg::CreateRoom {
+            name: "n".into(),
+            max_players: 255,
+            visible: true,
+            open: true,
+            props: map.clone(),
+            lobby_prop_keys: keys,
+            player_props: map.clone(),
+        });
+        // A full 255-key bag on each of the other three seating ops.
+        round_client(ClientMsg::JoinRoom { name: "n".into(), player_props: map.clone() });
+        round_client(ClientMsg::Rejoin { name: "n".into(), player_props: map.clone() });
+        round_client(ClientMsg::JoinRandom {
+            power_min: 0,
+            power_max: 1,
+            levels: vec![Value::Int(4)],
+            player_props: map,
+        });
+
+        let players: Vec<(i32, Map)> = (0..255).map(|i| (i, Map::new())).collect();
+        round_server(ServerMsg::JoinedRoom {
+            room_name: "n".into(),
+            your_actor: 1,
+            master_actor: 1,
+            room_props: Map::new(),
+            players,
+        });
+    }
+
+    #[test]
+    fn integer_and_double_extremes_survive() {
+        round_client(ClientMsg::JoinRandom {
+            power_min: i32::MIN,
+            power_max: i32::MAX,
+            levels: vec![Value::Int(i32::MIN), Value::Int(i32::MAX), Value::Int(0)],
+            player_props: Map::new(),
+        });
+        round_server(ServerMsg::PlayerEntered {
+            actor: i32::MIN,
+            props: Map::from_pairs(vec![
+                ("a", Value::Double(f64::MAX)),
+                ("b", Value::Double(f64::MIN_POSITIVE)),
+                ("c", Value::Double(f64::INFINITY)),
+            ]),
+        });
+    }
+
+    #[test]
+    fn wire_layout_is_byte_exact() {
+        // Guard the framing itself: little-endian everywhere, u16 string lengths,
+        // u8 counts, tag-then-payload values. If this test needs updating, the C#
+        // client needs updating too.
+        assert_eq!(
+            encode_client(&ClientMsg::Auth { user_id: "7".into(), token: "ab".into() }),
+            vec![OP_AUTH, 1, 0, b'7', 2, 0, b'a', b'b']
+        );
+        assert_eq!(
+            encode_client(&ClientMsg::JoinRandom {
+                power_min: 1,
+                power_max: 256,
+                levels: vec![Value::Int(4)],
+                player_props: Map::new(),
+            }),
+            // ... levels ValueList ..., then the trailing empty playerProps map (count 0).
+            vec![OP_JOIN_RANDOM, 1, 0, 0, 0, 0, 1, 0, 0, 1, TAG_INT, 4, 0, 0, 0, 0]
+        );
+        // The seating ops' trailing bag is an ordinary Map: count:u8 then (key,value)*.
+        assert_eq!(
+            encode_client(&ClientMsg::JoinRoom {
+                name: "42".into(),
+                player_props: Map::from_pairs(vec![("B", Value::Str("7".into()))]),
+            }),
+            vec![OP_JOIN_ROOM, 2, 0, b'4', b'2', 1, 1, 0, b'B', TAG_STRING, 1, 0, b'7']
+        );
+        assert_eq!(
+            encode_client(&ClientMsg::Rejoin {
+                name: "42".into(),
+                player_props: Map::from_pairs(vec![("F", Value::Int(5))]),
+            }),
+            vec![OP_REJOIN, 2, 0, b'4', b'2', 1, 1, 0, b'F', TAG_INT, 5, 0, 0, 0]
+        );
+        assert_eq!(
+            encode_client(&ClientMsg::SetPlayerProps {
+                props: Map::from_pairs(vec![("LB", Value::Int(12))]),
+            }),
+            vec![OP_SET_PLAYER_PROPS, 1, 2, 0, b'L', b'B', TAG_INT, 12, 0, 0, 0]
+        );
+        assert_eq!(
+            encode_server(&ServerMsg::PlayerLeft { actor: 2, inactive: true }),
+            vec![OP_PLAYER_LEFT, 2, 0, 0, 0, 1]
+        );
+        assert_eq!(
+            encode_server(&ServerMsg::AuthOk { actorless_time_ms: 1.0 }),
+            vec![OP_AUTH_OK, 0, 0, 0, 0, 0, 0, 0xf0, 0x3f]
+        );
+    }
+
+    #[test]
+    fn malformed_frames_are_rejected() {
+        assert_eq!(decode_client(&[]), Err(DecodeError::Empty));
+        assert_eq!(decode_client(&[99]), Err(DecodeError::UnknownOp(99)));
+        assert_eq!(decode_server(&[99]), Err(DecodeError::UnknownOp(99)));
+        // JoinLobby with a length prefix longer than the payload.
+        assert_eq!(decode_client(&[OP_JOIN_LOBBY, 4, 0, b'a']), Err(DecodeError::Truncated));
+        // Ping carries nothing.
+        assert_eq!(decode_client(&[OP_PING, 0]), Err(DecodeError::TrailingBytes));
+        // Unknown value tag inside a map.
+        assert_eq!(
+            decode_client(&[OP_SET_ROOM_PROPS, 1, 1, 0, b'A', 9]),
+            Err(DecodeError::UnknownTag(9))
+        );
+        // A map that promises two entries but carries one.
+        assert_eq!(
+            decode_client(&[OP_SET_ROOM_PROPS, 2, 1, 0, b'A', TAG_NULL]),
+            Err(DecodeError::Truncated)
+        );
+        // Invalid UTF-8 in a string.
+        assert_eq!(decode_client(&[OP_JOIN_ROOM, 1, 0, 0xff]), Err(DecodeError::BadUtf8));
+    }
+
+    #[test]
+    fn duplicate_map_keys_collapse_last_writer_wins() {
+        let bytes = vec![
+            OP_SET_ROOM_PROPS, 2,
+            1, 0, b'A', TAG_INT, 1, 0, 0, 0,
+            1, 0, b'A', TAG_INT, 2, 0, 0, 0,
+        ];
+        let ClientMsg::SetRoomProps { props } = decode_client(&bytes).unwrap() else {
+            panic!("expected SetRoomProps");
+        };
+        assert_eq!(props.len(), 1);
+        assert_eq!(props.get_int("A"), Some(2));
+    }
+
+    #[test]
+    fn map_set_is_last_writer_wins_in_place() {
+        let mut map = Map::from_pairs(vec![("A", Value::Int(1)), ("B", Value::Int(2))]);
+        map.set("A", Value::Int(9));
+        assert_eq!(map.len(), 2);
+        assert_eq!(
+            map.iter().map(|(k, _)| k).collect::<Vec<_>>(),
+            vec!["A", "B"]
+        );
+        assert_eq!(map.get_int("A"), Some(9));
+    }
+
+    #[test]
+    fn bool_payload_accepts_any_nonzero() {
+        // Photon writes 0/1; be lenient reading, strict writing.
+        assert_eq!(
+            decode_server(&[OP_PLAYER_LEFT, 1, 0, 0, 0, 7]),
+            Ok(ServerMsg::PlayerLeft { actor: 1, inactive: true })
+        );
+        assert_eq!(
+            encode_server(&ServerMsg::PlayerLeft { actor: 1, inactive: true })[5],
+            1
+        );
+    }
+}

src/router/multi_live/ws.rs

@@ -0,0 +1,367 @@
+// WebSocket end of the multi-live relay: GET /api/multi_live/ws.
+//
+// One task per connection reads frames, decodes them and drives the (synchronous,
+// lock-serialised) registry in rooms.rs. A second task per connection drains that
+// connection's unbounded queue into the socket. Nothing that touches the registry ever
+// awaits while the lock is held, which is what lets the registry hand out a total order
+// over every broadcast - see the header comment in rooms.rs.
+//
+// Everything the client can get wrong ends in a close: 4000 for a framing/protocol
+// error, 4001 for an unauthenticated or unauthenticated-first frame, 4002 for blowing
+// the inbound rate cap, 4003 for going silent long enough to be presumed dead (the
+// liveness sweep - see LIVENESS_TIMEOUT in rooms.rs, and start_sweeper below).
+
+use std::collections::VecDeque;
+use std::time::{Duration, Instant};
+
+use actix_web::rt;
+use actix_web::{web, HttpRequest, HttpResponse};
+use actix_ws::{AggregatedMessage, AggregatedMessageStream, CloseCode, CloseReason, Session};
+use tokio::sync::mpsc::{unbounded_channel, UnboundedReceiver, UnboundedSender};
+
+use crate::router::userdata;
+use super::proto::{
+    self, ClientMsg, DecodeError, ServerMsg, CLOSE_PROTOCOL, CLOSE_RATE_LIMIT,
+    CLOSE_UNAUTHENTICATED,
+};
+use super::rooms::{self, ConnId, Outbound};
+
+// "Server closes idle unauthenticated connections after 10s."
+const AUTH_TIMEOUT: Duration = Duration::from_secs(10);
+// "a per-connection cap of 30 inbound messages/sec ... over the cap -> close 4002".
+// The honest client peaks at 3-5/sec.
+const RATE_LIMIT_PER_SEC: usize = 30;
+const RATE_WINDOW: Duration = Duration::from_secs(1);
+// Property bags and RPC params are tens of bytes; nothing legitimate comes close.
+const MAX_FRAME_BYTES: usize = 64 * 1024;
+// How often the inactive-actor, empty-room and connection-liveness expiries are checked.
+const SWEEP_INTERVAL: Duration = Duration::from_secs(1);
+
+pub async fn ws(req: HttpRequest, body: web::Payload) -> Result<HttpResponse, actix_web::Error> {
+    // Older client builds carry incompatible multi implementations (pre-relay wire
+    // framing), so the upgrade itself is gated on the extended-protocol version — a
+    // non-101 answer makes the client's ConnectAsync fail cleanly into its official
+    // disconnect flow instead of mis-framing against the relay.
+    let protocol = crate::router::global::client_protocol_version(&req);
+    if protocol < super::PROTOCOL_VERSION {
+        println!(
+            "multi_live/ws: upgrade refused, X-Protocol-Version {} < {}",
+            protocol,
+            super::PROTOCOL_VERSION
+        );
+        return Ok(HttpResponse::UpgradeRequired().finish());
+    }
+    let (response, session, stream) = match actix_ws::handle(&req, body) {
+        Ok(parts) => {
+            println!("multi_live/ws: upgrade accepted, awaiting Auth");
+            parts
+        }
+        Err(err) => {
+            println!("multi_live/ws: upgrade REJECTED (not a websocket handshake?): {}", err);
+            return Err(err);
+        }
+    };
+    let stream = stream
+        .max_frame_size(MAX_FRAME_BYTES)
+        .aggregate_continuations()
+        .max_continuation_size(MAX_FRAME_BYTES);
+
+    let (tx, rx) = unbounded_channel::<Outbound>();
+    rt::spawn(writer(session, rx));
+    rt::spawn(reader(stream, tx));
+    Ok(response)
+}
+
+// The expiry timers: held-slot TTL, empty-room TTL and the connection liveness window.
+//
+// One task for the whole process, started from run_server so it lives on the system
+// arbiter. It used to be lazily started by the first WebSocket upgrade instead, which put
+// it on whichever HTTP worker happened to serve that upgrade: a panic anywhere in that
+// worker took the sweeper down with it, permanently and silently, and `Once` guaranteed
+// nothing would ever start it again. Every room in the process would then hold its seats
+// forever.
+//
+// Called once per run_server, unconditionally and not behind a "started already" flag:
+// each run_server builds its own actix System, and a task spawned on the previous one died
+// with it (the mobile path stops and restarts the server in-process). A flag would leave
+// the restarted server with no sweeper at all; two sweepers, if they ever overlapped,
+// would only mean the idempotent sweep runs twice a second.
+pub fn start_sweeper() {
+    rt::spawn(async {
+        let mut ticker = rt::time::interval(SWEEP_INTERVAL);
+        loop {
+            ticker.tick().await;
+            // The guard is a temporary: it is released before the next await.
+            rooms::registry().sweep(Instant::now());
+        }
+    });
+}
+
+// Drains this connection's FIFO queue to the socket. The queue is unbounded so that the
+// registry can push a whole broadcast while holding its lock without ever blocking.
+async fn writer(mut session: Session, mut rx: UnboundedReceiver<Outbound>) {
+    while let Some(out) = rx.recv().await {
+        match out {
+            Outbound::Msg(msg) => {
+                if session.binary(proto::encode_server(&msg)).await.is_err() {
+                    return;
+                }
+            }
+            Outbound::Pong(bytes) => {
+                if session.pong(&bytes).await.is_err() {
+                    return;
+                }
+            }
+            Outbound::Close(code) => {
+                let _ = session
+                    .close(Some(CloseReason { code: CloseCode::Other(code), description: None }))
+                    .await;
+                return;
+            }
+        }
+    }
+    // Queue closed: the connection was deregistered, so the socket goes with it.
+    let _ = session.close(None).await;
+}
+
+async fn reader(mut stream: AggregatedMessageStream, tx: UnboundedSender<Outbound>) {
+    let Some(id) = authenticate(&mut stream, &tx).await else {
+        return;
+    };
+
+    let mut rate = RateLimiter::new();
+    loop {
+        let Some(frame) = stream.recv().await else {
+            break;
+        };
+        let payload = match frame {
+            Ok(AggregatedMessage::Binary(bytes)) => bytes,
+            Ok(AggregatedMessage::Ping(bytes)) => {
+                // WebSocket-level keepalive, unrelated to the protocol's Ping op. It is
+                // still proof the socket is alive, so it counts for the liveness window
+                // (the protocol ops are touched inside registry.handle).
+                rooms::registry().touch(id, Instant::now());
+                let _ = tx.send(Outbound::Pong(bytes.to_vec()));
+                continue;
+            }
+            Ok(AggregatedMessage::Pong(_)) => {
+                rooms::registry().touch(id, Instant::now());
+                continue;
+            }
+            Ok(AggregatedMessage::Close(_)) => break,
+            Ok(AggregatedMessage::Text(_)) => {
+                // "binary frames only ... Text frames are a protocol error -> close".
+                println!("multi_live/ws: text frame from conn {}", id);
+                close(&tx, CLOSE_PROTOCOL);
+                break;
+            }
+            Err(err) => {
+                println!("multi_live/ws: websocket error on conn {}: {}", id, err);
+                break;
+            }
+        };
+
+        let now = Instant::now();
+        if !rate.allow(now) {
+            println!("multi_live/ws: conn {} exceeded {} msg/sec", id, RATE_LIMIT_PER_SEC);
+            close(&tx, CLOSE_RATE_LIMIT);
+            break;
+        }
+
+        let msg = match proto::decode_client(&payload) {
+            Ok(msg) => msg,
+            Err(err) => {
+                println!("multi_live/ws: bad frame from conn {}: {}", id, err);
+                close(&tx, close_code_for(&err));
+                break;
+            }
+        };
+        if matches!(msg, ClientMsg::Auth { .. }) {
+            // Auth is the first message and only the first message.
+            println!("multi_live/ws: repeat Auth on conn {}", id);
+            close(&tx, CLOSE_PROTOCOL);
+            break;
+        }
+        rooms::registry().handle(id, msg, now);
+    }
+
+    rooms::registry().disconnect(id, Instant::now());
+}
+
+// Reads the mandatory first frame and registers the connection. Returns None when the
+// connection was closed instead.
+async fn authenticate(
+    stream: &mut AggregatedMessageStream,
+    tx: &UnboundedSender<Outbound>,
+) -> Option<ConnId> {
+    let first = match rt::time::timeout(AUTH_TIMEOUT, stream.recv()).await {
+        Ok(Some(Ok(frame))) => frame,
+        Ok(Some(Err(_))) | Ok(None) => return None,
+        Err(_) => {
+            println!("multi_live/ws: no Auth within {}s", AUTH_TIMEOUT.as_secs());
+            close(tx, CLOSE_UNAUTHENTICATED);
+            return None;
+        }
+    };
+
+    let AggregatedMessage::Binary(payload) = first else {
+        // "First message on a connection MUST be Auth; anything else -> close 4001."
+        close(tx, CLOSE_UNAUTHENTICATED);
+        return None;
+    };
+    let Ok(ClientMsg::Auth { user_id, token }) = proto::decode_client(&payload) else {
+        println!("multi_live/ws: first message was not a decodable Auth frame");
+        close(tx, CLOSE_UNAUTHENTICATED);
+        return None;
+    };
+
+    let Some(uid) = resolve_user(&user_id, &token) else {
+        // Never print the token itself (it is the login credential); empty-vs-unknown is
+        // the diagnostic that matters: empty means the client sent no credential at all
+        // (the pre-fix Android builds sent UserSaveData.m_uuid, which device builds never
+        // populate), unknown means a credential the tokens table has no row for.
+        println!(
+            "multi_live/ws: rejecting uid {}: bad session ({})",
+            user_id,
+            if token.is_empty() { "empty token" } else { "unknown token" }
+        );
+        close(tx, CLOSE_UNAUTHENTICATED);
+        return None;
+    };
+
+    let id = rooms::registry().connect(uid, tx.clone(), Instant::now());
+    println!("multi_live/ws: auth ok, uid {} connected as conn {}", uid, id);
+    let _ = tx.send(Outbound::Msg(ServerMsg::AuthOk {
+        actorless_time_ms: rooms::server_time_ms(),
+    }));
+    Some(id)
+}
+
+// The relay validates the same credential the HTTP layer does. Over HTTP the login token
+// arrives inside the `a6573cbe` header (global::get_login) and every handler then keys
+// userdata off it; here it arrives as the Auth payload instead, and the tokens table maps
+// it back to the account. The claimed userId only has to agree with the token, so a
+// client cannot relay as somebody else - which is a little stricter than the HTTP layer,
+// where an unknown token simply resolves to an empty account.
+fn resolve_user(user_id: &str, token: &str) -> Option<i64> {
+    if token.is_empty() {
+        return None;
+    }
+    match_claim(user_id, userdata::uid_from_login_token(token))
+}
+
+// The claim check, split out from the lookup so it can be tested without a database.
+// `uid` is 0 when the token is unknown.
+fn match_claim(user_id: &str, uid: i64) -> Option<i64> {
+    if uid == 0 {
+        return None;
+    }
+    match user_id.parse::<i64>() {
+        // A blank or unparsable userId is tolerated: the token is the authority.
+        Err(_) => Some(uid),
+        Ok(claimed) if claimed == 0 || claimed == uid => Some(uid),
+        Ok(_) => None,
+    }
+}
+
+fn close_code_for(err: &DecodeError) -> u16 {
+    // The spec names 4001 and 4002 only; every framing failure shares 4000.
+    match err {
+        DecodeError::Empty
+        | DecodeError::Truncated
+        | DecodeError::TrailingBytes
+        | DecodeError::BadUtf8
+        | DecodeError::UnknownOp(_)
+        | DecodeError::UnknownTag(_) => CLOSE_PROTOCOL,
+    }
+}
+
+fn close(tx: &UnboundedSender<Outbound>, code: u16) {
+    let _ = tx.send(Outbound::Close(code));
+}
+
+// Sliding one second window rather than a fixed bucket, so 30 messages either side of a
+// second boundary still trips the cap.
+struct RateLimiter {
+    seen: VecDeque<Instant>,
+}
+
+impl RateLimiter {
+    fn new() -> Self {
+        RateLimiter { seen: VecDeque::with_capacity(RATE_LIMIT_PER_SEC + 1) }
+    }
+
+    fn allow(&mut self, now: Instant) -> bool {
+        while let Some(front) = self.seen.front() {
+            if now.duration_since(*front) >= RATE_WINDOW {
+                self.seen.pop_front();
+            } else {
+                break;
+            }
+        }
+        if self.seen.len() >= RATE_LIMIT_PER_SEC {
+            return false;
+        }
+        self.seen.push_back(now);
+        true
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn rate_limiter_allows_the_cap_and_rejects_the_next() {
+        let mut rate = RateLimiter::new();
+        let start = Instant::now();
+        for i in 0..RATE_LIMIT_PER_SEC {
+            assert!(rate.allow(start + Duration::from_millis(i as u64)), "message {} refused", i);
+        }
+        assert!(!rate.allow(start + Duration::from_millis(999)));
+        // The window slides: once the first message ages out there is room again.
+        assert!(rate.allow(start + Duration::from_millis(1001)));
+    }
+
+    #[test]
+    fn rate_limiter_catches_a_burst_straddling_a_second_boundary() {
+        let mut rate = RateLimiter::new();
+        let start = Instant::now();
+        // 29 messages at the end of one second...
+        for i in 0..RATE_LIMIT_PER_SEC - 1 {
+            assert!(rate.allow(start + Duration::from_millis(900 + i as u64)));
+        }
+        // ...and two more just after the boundary is still 31 inside one second.
+        assert!(rate.allow(start + Duration::from_millis(1000)));
+        assert!(!rate.allow(start + Duration::from_millis(1001)));
+    }
+
+    #[test]
+    fn every_decode_failure_closes_with_the_protocol_code() {
+        for err in [
+            DecodeError::Empty,
+            DecodeError::Truncated,
+            DecodeError::TrailingBytes,
+            DecodeError::BadUtf8,
+            DecodeError::UnknownOp(200),
+            DecodeError::UnknownTag(9),
+        ] {
+            assert_eq!(close_code_for(&err), CLOSE_PROTOCOL);
+        }
+    }
+
+    #[test]
+    fn auth_needs_a_token_that_agrees_with_the_claimed_user() {
+        // An empty token never reaches the database.
+        assert_eq!(resolve_user("1", ""), None);
+        // An unknown token resolves to uid 0.
+        assert_eq!(match_claim("1", 0), None);
+        assert_eq!(match_claim("42", 42), Some(42));
+        // Claiming somebody else's account with your own token is refused.
+        assert_eq!(match_claim("43", 42), None);
+        // A blank, zero or unparsable userId defers to the token.
+        assert_eq!(match_claim("", 42), Some(42));
+        assert_eq!(match_claim("0", 42), Some(42));
+        assert_eq!(match_claim("not-a-number", 42), Some(42));
+    }
+}

src/router/tools/guest.rs

@@ -119,6 +119,37 @@ fn proxy_card_id(id: i64) -> i64 {
     *rv
 }
 
+// A card row for a slot the account can't actually supply: level 1, unevolved.
+// Only ever handed to viewers, never written back to the account
+fn stand_in_card(master_card_id: i64) -> JsonValue {
+    object!{
+        id: master_card_id,
+        master_card_id: master_card_id,
+        exp: 0,
+        skill_exp: 0,
+        evolve: []
+    }
+}
+
+// The card object for one of the four favourite/guest slots. global::get_card
+// hands back an empty object when the slot is 0 (never set) or names a card the
+// account no longer holds, and an empty object reaches the client as
+// master_card_id 0: Shock.CardData's constructor looks that up in masterdata and
+// dereferences the row, so it throws before the guest cell is ever drawn. Same
+// repair userdata::remove_deleted_custom_cards makes for a dead slot - the
+// account's first card, then the default for an account holding none
+fn slot_card(id: i64, user: &JsonValue) -> JsonValue {
+    let card = global::get_card(id, user);
+    if !card.is_empty() {
+        return card;
+    }
+    let first = &user["card_list"][0];
+    if !first.is_empty() {
+        return first.clone();
+    }
+    stand_in_card(DEFAULT_CARD)
+}
+
 pub fn proxy_user_cards(user: &mut JsonValue, protocol: u32) {
     for key in ["favorite_master_card_id", "guest_smile_master_card_id", "guest_cool_master_card_id", "guest_pure_master_card_id"] {
         let id = user["user"][key].as_i64().unwrap_or(0);
@@ -176,12 +207,26 @@ pub fn get_user(id: i64, friends: &JsonValue, view: UserView, protocol: u32) ->
 
     let mut rv = object!{
         user: user["user"].clone(),
-        favorite_card: global::get_card(user["user"]["favorite_master_card_id"].as_i64().unwrap_or(0), &user),
-        guest_smile_card: global::get_card(user["user"]["guest_smile_master_card_id"].as_i64().unwrap_or(0), &user),
-        guest_cool_card: global::get_card(user["user"]["guest_cool_master_card_id"].as_i64().unwrap_or(0), &user),
-        guest_pure_card: global::get_card(user["user"]["guest_pure_master_card_id"].as_i64().unwrap_or(0), &user)
+        favorite_card: slot_card(user["user"]["favorite_master_card_id"].as_i64().unwrap_or(0), &user),
+        guest_smile_card: slot_card(user["user"]["guest_smile_master_card_id"].as_i64().unwrap_or(0), &user),
+        guest_cool_card: slot_card(user["user"]["guest_cool_master_card_id"].as_i64().unwrap_or(0), &user),
+        guest_pure_card: slot_card(user["user"]["guest_pure_master_card_id"].as_i64().unwrap_or(0), &user)
     };
 
+    // The id fields have to name the same card as the objects: surfaces that
+    // resolve the id instead of the object (profile, friend detail) would
+    // otherwise look up the slot this just stood in for. A no-op for an account
+    // whose slots are all set
+    for (key, card) in [
+        ("favorite_master_card_id", "favorite_card"),
+        ("guest_smile_master_card_id", "guest_smile_card"),
+        ("guest_cool_master_card_id", "guest_cool_card"),
+        ("guest_pure_master_card_id", "guest_pure_card")
+    ] {
+        let id = rv[card]["master_card_id"].clone();
+        rv["user"][key] = id;
+    }
+
     if let UserView::Detail | UserView::Ranking = view {
         rv["main_deck_detail"] = object!{
             total_power: 0,
@@ -237,6 +282,33 @@ mod tests {
         }
     }
 
+    // A slot the account can't supply still hands the viewer a resolvable card:
+    // an empty card object reaches the client as master_card_id 0, and
+    // Shock.CardData throws on an id that isn't in masterdata
+    #[test]
+    fn empty_slots_stand_in_for_a_real_card() {
+        let user = jzon::object!{
+            "user": { "favorite_master_card_id": 0 },
+            "card_list": [
+                { "id": 40030007, "master_card_id": 40030007, "exp": 0, "skill_exp": 0, "evolve": [] },
+                { "id": 10010001, "master_card_id": 10010001, "exp": 0, "skill_exp": 0, "evolve": [] }
+            ]
+        };
+        assert_eq!(slot_card(40030007, &user)["master_card_id"].as_i64(), Some(40030007));
+        // Never set, and a card the account no longer holds, both fall back to
+        // its first card
+        assert_eq!(slot_card(0, &user)["master_card_id"].as_i64(), Some(40030007));
+        assert_eq!(slot_card(20010001, &user)["master_card_id"].as_i64(), Some(40030007));
+
+        // A tutorial-stage account holds nothing at all
+        let empty = jzon::object!{ "user": {}, "card_list": [] };
+        let card = slot_card(0, &empty);
+        assert_eq!(card["master_card_id"].as_i64(), Some(DEFAULT_CARD));
+        assert_eq!(card["id"].as_i64(), Some(DEFAULT_CARD));
+        assert!(card["evolve"].is_array());
+        assert!(!databases::CARD_LIST[DEFAULT_CARD.to_string()].is_empty());
+    }
+
     // The imported band proxies to its own character's base card, not to a
     // single default (the old prefix arithmetic collapsed 14000+ to Honoka)
     #[test]

src/router/user.rs

@@ -67,8 +67,7 @@ async fn user(req: HttpRequest, Login(key): Login) -> impl Responder {
         }
     }
 
-    // Runtime custom cards are unresolvable below protocol 3. start.rs blocks
-    // flagged accounts on old clients, so this is belt-and-braces
+    // Don't allow account downgrade (will crash client)
     if !crate::router::custom_card::client_supports(&req) {
         crate::router::custom_card::strip_unsupported(&mut user);
     }
@@ -182,9 +181,10 @@ async fn user_post(Session { key, body }: Session) -> impl Responder {
 pub async fn announcement(Login(key): Login) -> impl Responder {
     
     let mut user = userdata::get_acc_home(&key);
-    
+
     user["home"]["new_announcement_flag"] = (0).into();
-    
+    user["home"]["announcement_seen_at"] = (global::timestamp() as i64).into();
+
     userdata::save_acc_home(&key, user);
     
     Api(Some(object!{

src/router/userdata/mod.rs

@@ -1,4 +1,5 @@
 pub mod user;
+pub mod starter;
 
 use rusqlite::params;
 use lazy_static::lazy_static;
@@ -246,6 +247,13 @@ fn get_uid(token: &str) -> i64 {
     data.parse::<i64>().unwrap_or(0)
 }
 
+// The account a login token belongs to, 0 when the token is unknown. The HTTP layer
+// never needs this (it keys everything off the token itself), but the multi-live relay
+// authenticates a {userId, token} pair and has to check the two agree.
+pub fn uid_from_login_token(token: &str) -> i64 {
+    get_uid(token)
+}
+
 // Needed by gree
 pub fn get_login_token(uid: i64) -> String {
     let data = DATABASE.lock_and_select("SELECT token FROM tokens WHERE user_id=?1", params!(uid));
@@ -475,6 +483,47 @@ pub fn save_acc_eventlogin(auth_key: &str, data: JsonValue) {
 pub fn save_server_data(auth_key: &str, data: JsonValue) {
     save_data(auth_key, "server_data", data);
 }
+
+// Read-modify-write of one account's server_data as ONE atomic step.
+//
+// get_server_data + save_server_data open a connection each, so two requests for the same
+// account both read the pre-state and the later write wins - which for a record that is
+// meant to be spent exactly once (the started-live record /multi_live/end awards off) means
+// both ends see it and both award. Everything here happens inside a single BEGIN IMMEDIATE
+// transaction instead, so concurrent callers serialise and the second one observes what the
+// first one wrote.
+//
+// `f` sees the parsed server_data and returns whatever the caller needs out of it; the
+// (possibly mutated) value is written back before the transaction commits. get_key runs
+// BEFORE the transaction because it can create the account, which writes on its own
+// connection and would otherwise deadlock against our write lock.
+//
+// A database error yields T::default() rather than a panic: the callers all have a
+// "nothing to spend" branch, which is the right answer when the record could not be read.
+pub fn modify_server_data<T: Default>(auth_key: &str, f: impl FnOnce(&mut JsonValue) -> T) -> T {
+    let key = get_key(auth_key);
+    let rv = DATABASE.lock_and_transact(|conn| {
+        let raw: String = conn.query_row(
+            "SELECT server_data FROM server_data WHERE user_id=?1",
+            params!(key),
+            |row| row.get(0)
+        )?;
+        let mut data = jzon::parse(&raw).unwrap_or(JsonValue::Null);
+        let rv = f(&mut data);
+        conn.execute(
+            "UPDATE server_data SET server_data=?1 WHERE user_id=?2",
+            params!(jzon::stringify(data), key)
+        )?;
+        Ok(rv)
+    });
+    match rv {
+        Ok(rv) => rv,
+        Err(err) => {
+            println!("modify_server_data: {} for user {}", err, key);
+            T::default()
+        }
+    }
+}
 pub fn save_acc_chats(auth_key: &str, data: JsonValue) {
     save_data(auth_key, "chats", data);
 }
@@ -739,6 +788,37 @@ pub fn export_user(token: &str) -> Option<JsonValue> {
     })
 }
 
+// Every row an account owns, gone. Factored out of purge_accounts so the arcade
+// sweeper (a machine that aged out takes its two accounts with it) and the
+// card-rebind orphan cleanup delete exactly the same set of rows - an account
+// half-deleted here is one the login path would resurrect empty.
+//
+// This list is also what the arcade guest reset mirrors: starter::write_starter_rows
+// rewrites the eleven data rows, re-draws the token and deletes the rest, so a
+// row added here has to be accounted for there too or a guest starts carrying
+// the previous player's state across a credit.
+pub const ACCOUNT_TABLES: &[&str] = &[
+    "userdata", "userhome", "missions", "loginbonus", "sifcards", "friends",
+    "chats", "exchange", "event", "eventloginbonus", "server_data", "webui",
+    "tokens", "migration"
+];
+
+pub fn delete_account(user_id: i64) {
+    crate::database::gree::delete_uuid(user_id);
+    for table in ACCOUNT_TABLES {
+        DATABASE.lock_and_exec(&format!("DELETE FROM {} WHERE user_id=?1", table), params!(user_id));
+    }
+}
+
+// True when the account has ever registered a data-transfer password, which is
+// the only way an account can be taken over from another device. The arcade uses
+// it to tell a throwaway account it made itself from a real player's account.
+pub fn has_transfer_password(user_id: i64) -> bool {
+    !DATABASE.lock_and_select("SELECT password FROM migration WHERE user_id=?1", params!(user_id))
+        .unwrap_or_default()
+        .is_empty()
+}
+
 pub fn purge_accounts() -> usize {
     // If the user has no cards, its safe to assume its a dead account (imo). In the (rare) event this function is ran after a user started and before the account has characters, the server should create them a new account, and let them start the tutorial over.
     let dead_uids = DATABASE.lock_and_select_all("
@@ -754,21 +834,7 @@ pub fn purge_accounts() -> usize {
     for uid in dead_uids.members() {
         let user_id = uid.as_i64().unwrap();
         println!("Removing dead UID: {}", user_id);
-        crate::database::gree::delete_uuid(user_id);
-        DATABASE.lock_and_exec("DELETE FROM userdata WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM userhome WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM missions WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM loginbonus WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM sifcards WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM friends WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM chats WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM exchange WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM event WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM eventloginbonus WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM server_data WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM webui WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM tokens WHERE user_id=?1", params!(user_id));
-        DATABASE.lock_and_exec("DELETE FROM migration WHERE user_id=?1", params!(user_id));
+        delete_account(user_id);
     }
     DATABASE.lock_and_exec("VACUUM", params!());
     crate::database::gree::setup();

src/router/userdata/new_user_event.json

@@ -1,13 +1,29 @@
 {
     "point_ranking": {
+        "rank": 0,
         "point": 0
     },
-    "score_ranking": [],
-    "member_ranking": [],
-    "lottery_box": [],
+    "score_ranking": {
+        "all_rank": 0,
+        "group_rank": 0,
+        "score": 0
+    },
+    "member_ranking": {
+        "master_character_id": 0,
+        "rank": 0,
+        "point": 0
+    },
+    "lottery_box": {
+        "master_lottery_id": 0,
+        "reset_count": 0,
+        "draw_count_list": []
+    },
     "mission_list": [],
     "policy_agreement": 0,
     "incentive_lottery": 0,
+    "is_disconnected": 0,
+    "help_count": 0,
+    "penalty_remaining_time": 0,
     "star_event": {
         "star_level": 0,
         "last_event_star_level": 0,

src/router/userdata/starter.rs

@@ -0,0 +1,465 @@
+// Accounts that are born finished.
+//
+// Everything below Title in the client assumes a tutorial-complete account: a
+// name, a favourite card, a nine-card deck, tutorial_step 130. The tutorial that
+// produces one is four client requests, and nothing on the server can create
+// that state on its own - which is exactly what the arcade needs, twice per
+// cabinet (the machine identity and its guest) and again at every credit (the
+// guest, rewritten in place).
+//
+// So this module replays those four requests' mutations, in their order, off
+// their own handlers' code:
+//
+//   POST /api/lottery            the tutorial draw leaves a card in card_list,
+//                                which is what /user/initialize reads as the
+//                                account's "ur" (lottery.rs:342-358, user.rs:383)
+//   POST /api/user/initialize    favourite + guest cards, 3000 gems, the band
+//                                title, the nine base cards, deck slot 1,
+//                                character_list, the first bond mission
+//                                (user.rs:371-453)
+//   POST /api/user               the player's name (user.rs:138-140)
+//   POST /api/tutorial           tutorial_step 130 and full stamina
+//                                (tutorial.rs:13-17)
+//
+// The one deliberate difference is the gacha: a cabinet draws nothing random.
+// The chosen member's own base card takes the "ur" slot instead, which leaves
+// the starter deck complete (nine distinct cards) rather than one short, and
+// makes every arcade account byte-identical apart from its name.
+//
+// `write_starter_rows` is the single source of truth for what an account is made
+// of, shared by creation and by the guest reset - the two can never drift.
+//
+// It is also the single source of truth for what an account is NOT made of. A
+// guest is handed to a stranger every credit, so the reset has to leave behind
+// exactly what a freshly created account has: the eleven data rows, one login
+// token, and nothing else. Every other row `delete_account` recognises as
+// account-owned (mod.rs:791) is deleted here rather than rewritten - the
+// transfer code and password /api/user/registerpassword registers, the webui
+// session, the gree device certificate - because each of them is a credential
+// the previous player could keep and come back with. The login token is the one
+// thing that is kept in the sense that the account keeps having one, but it is
+// re-drawn too: the old one is on the cabinet's disk and may be on the previous
+// player's phone, and /api/arcade/session hands the new one straight back to the
+// cabinet in the `uuid` the client already adopts.
+
+use jzon::{array, object, JsonValue};
+use rusqlite::params;
+
+use crate::include_file;
+use crate::router::{card, chat, global, items, live};
+use super::{DATABASE, NEW_USER, acc_exists, generate_uid};
+
+// The member every arcade account is built around: Kousaka Honoka, the first
+// member of the first band, so the deck is deterministic and recognisable.
+// user/initialize derives everything else from this one id.
+const STARTER_CHARACTER_ID: i64 = 1001;
+
+// The nine cards /user/initialize rewards for a mu's pick (user.rs:398)
+const STARTER_CARDS: &[i64] = &[
+    10010001, 10020001, 10030001, 10040001, 10050001,
+    10060001, 10070001, 10080001, 10090001
+];
+
+// The card the tutorial gacha would have left in card_list[0]. See the module
+// note: the chosen member's own base card, so the deck comes out whole.
+const STARTER_UR: i64 = 10010001;
+
+// user.rs:396-411: 3000000 + the band offset (0 for mu's) + the member's index
+// within the band, which is the last two digits of the character id
+const STARTER_TITLE_ID: i64 = 3_000_000 + STARTER_CHARACTER_ID % 100;
+
+// Every account name is stored verbatim by /api/user, so a cabinet name is no
+// more dangerous than a player name - but it arrives from a machine that types
+// it once and never again, so it is clamped rather than trusted to be sane.
+pub const MAX_NAME_LEN: usize = 32;
+
+pub fn clean_name(name: &str, fallback: &str) -> String {
+    let name: String = name
+        .chars()
+        .filter(|c| !c.is_control())
+        .take(MAX_NAME_LEN)
+        .collect();
+    let name = name.trim();
+    if name.is_empty() {
+        return fallback.to_string();
+    }
+    name.to_string()
+}
+
+// The userdata blob a finished tutorial leaves behind, plus the two side rows it
+// writes on the way (the mission progress and the chat it unlocks).
+fn tutorial_complete(uid: i64, name: &str) -> (JsonValue, JsonValue, JsonValue, JsonValue) {
+    let now = global::timestamp();
+
+    // create_acc (mod.rs:230-232)
+    let mut user = NEW_USER.clone();
+    user["user"]["id"] = uid.into();
+    user["stamina"]["last_updated_time"] = now.into();
+
+    let mut home = jzon::parse(&include_file!("src/router/userdata/new_user_home.json")).unwrap();
+    let mut missions = jzon::parse(&include_file!("src/router/userdata/missions.json")).unwrap();
+    let mut chats = array![];
+
+    // --- POST /api/user/initialize (user.rs:371-453) ------------------------
+    chat::add_chat(STARTER_CHARACTER_ID, 1, &mut chats);
+
+    user["user"]["favorite_master_card_id"] = STARTER_UR.into();
+    user["user"]["guest_smile_master_card_id"] = STARTER_UR.into();
+    user["user"]["guest_cool_master_card_id"] = STARTER_UR.into();
+    user["user"]["guest_pure_master_card_id"] = STARTER_UR.into();
+    home["home"]["preset_setting"][0]["illust_master_card_id"] = STARTER_UR.into();
+    user["gem"]["free"] = (3000).into();
+    user["gem"]["total"] = (3000).into();
+    user["user"]["master_title_ids"][0] = STARTER_TITLE_ID.into();
+
+    // The clear-mission and chat out-parameters are thrown away here exactly as
+    // /user/initialize throws them away (user.rs:418): the only chat a fresh
+    // account keeps is the one added above.
+    for id in STARTER_CARDS {
+        items::give_character(*id, &mut user, &mut missions, &mut array![], &mut array![]);
+    }
+
+    let mut others = array![];
+    for id in STARTER_CARDS {
+        if id / 10000 != STARTER_CHARACTER_ID {
+            others.push(*id).unwrap();
+        }
+    }
+    for slot in 0..9 {
+        let card_id = if slot == 4 {
+            STARTER_UR
+        } else if slot < 4 {
+            others[slot].as_i64().unwrap_or(0)
+        } else {
+            others[slot - 1].as_i64().unwrap_or(0)
+        };
+        user["deck_list"][0]["main_card_ids"][slot] = card_id.into();
+    }
+
+    user["character_list"] = array![object!{
+        master_character_id: STARTER_CHARACTER_ID,
+        exp: 1
+    }];
+    let bond = live::bond_missions(STARTER_CHARACTER_ID);
+    if !bond.is_empty() {
+        items::advance_mission(bond[0][1].as_i64().unwrap(), 1, bond[0][0].as_i64().unwrap(), &mut missions);
+    }
+
+    // --- POST /api/user (user.rs:138-140) -----------------------------------
+    user["user"]["name"] = name.into();
+
+    // --- POST /api/tutorial, the final step (tutorial.rs:13-17) -------------
+    user["tutorial_step"] = (130).into();
+    user["stamina"]["stamina"] = (100).into();
+    user["stamina"]["last_updated_time"] = now.into();
+
+    (user, home, missions, chats)
+}
+
+// Everything create_acc seeds, as (table, value). The column always carries the
+// table's own name; `userdata` is the one row with extra columns and is written
+// by the caller.
+fn side_rows(chats: &JsonValue, home: &JsonValue, missions: &JsonValue) -> Vec<(&'static str, String)> {
+    let now = global::timestamp();
+    vec![
+        ("userhome", jzon::stringify(home.clone())),
+        ("missions", jzon::stringify(missions.clone())),
+        ("chats", jzon::stringify(chats.clone())),
+        ("loginbonus", format!(r#"{{"last_rewarded": 0, "bonus_list": [], "start_time": {}}}"#, now)),
+        ("eventloginbonus", format!(r#"{{"last_rewarded": 0, "bonus_list": [], "start_time": {}}}"#, now)),
+        ("sifcards", String::from("[]")),
+        ("friends", String::from(r#"{"friend_user_id_list":[],"request_user_id_list":[],"pending_user_id_list":[]}"#)),
+        ("event", String::from("{}")),
+        ("exchange", String::from("[]")),
+        ("server_data", format!(r#"{{"server_time_set":{},"server_time":1709272800}}"#, now))
+    ]
+}
+
+// The rows delete_account (mod.rs:791) removes that write_starter_rows does not
+// write back: everything an account owns that is a credential rather than
+// progress. `tokens` is not here because the starter write issues a fresh one in
+// the same transaction, and `userdata` and its ten side tables are not here
+// because they are rewritten. Anything added to delete_account's list belongs in
+// one of those three places or the guest reset starts leaking again.
+const CARRIED_CREDENTIAL_TABLES: &[&str] = &["migration", "webui"];
+
+// Writes the whole account inside one transaction: the eleven data rows back to
+// the starter state, every carried-over credential gone, and a login token
+// nobody has seen before. Upserts rather than inserts, so the same code both
+// creates an account and rewrites an existing one - the reset can never
+// half-apply, and it cannot miss a table that creation seeds because there is
+// only one list. Returns the account's new login token.
+fn write_starter_rows(uid: i64, name: &str) -> Result<String, rusqlite::Error> {
+    let (user, home, missions, chats) = tutorial_complete(uid, name);
+    let rows = side_rows(&chats, &home, &missions);
+    let friend_request_disabled = user["user"]["friend_request_disabled"].as_i32().unwrap_or(1);
+    let protocol_version = if card::account_has_custom_cards(&user) { card::PROTOCOL_VERSION } else { 0 };
+    let userdata = jzon::stringify(user);
+    let token = global::create_token();
+
+    DATABASE.lock_and_transact(|conn| {
+        conn.execute(
+            "INSERT INTO userdata (user_id, userdata, friend_request_disabled, protocol_version) VALUES (?1, ?2, ?3, ?4)
+             ON CONFLICT(user_id) DO UPDATE SET userdata=?2, friend_request_disabled=?3, protocol_version=?4",
+            params!(uid, &userdata, friend_request_disabled, protocol_version)
+        )?;
+        for (table, value) in &rows {
+            conn.execute(
+                &format!(
+                    "INSERT INTO {0} (user_id, {0}) VALUES (?1, ?2) ON CONFLICT(user_id) DO UPDATE SET {0}=?2",
+                    table
+                ),
+                params!(uid, value)
+            )?;
+        }
+        for table in CARRIED_CREDENTIAL_TABLES {
+            conn.execute(&format!("DELETE FROM {} WHERE user_id=?1", table), params!(uid))?;
+        }
+        // The account's one login token, re-drawn. The DELETE by token is
+        // create_acc's own collision guard (mod.rs:238); the DELETE by user id is
+        // what makes the INSERT a rotation rather than a primary-key conflict.
+        conn.execute("DELETE FROM tokens WHERE token=?1", params!(&token))?;
+        conn.execute("DELETE FROM tokens WHERE user_id=?1", params!(uid))?;
+        conn.execute("INSERT INTO tokens (user_id, token) VALUES (?1, ?2)", params!(uid, &token))?;
+        Ok(token)
+    })
+}
+
+// A brand new account, already through the tutorial. Returns its user id and its
+// login token - the uuid the client stores and authenticates with from then on.
+pub fn create(name: &str) -> Option<(i64, String)> {
+    let uid = generate_uid();
+    match write_starter_rows(uid, name) {
+        Ok(token) => Some((uid, token)),
+        Err(err) => {
+            println!("arcade: could not create account {}: {}", uid, err);
+            None
+        }
+    }
+}
+
+// Rewrites an existing account back to the starter state, keeping its user id:
+// the cabinet's guest, at the start of every credit. Returns the account's new
+// login token, which /api/arcade/session answers with - the previous player's
+// copy of the old one stops working the moment their credit ends.
+pub fn reset(uid: i64, name: &str) -> Option<String> {
+    if !acc_exists(uid) {
+        return None;
+    }
+    let token = match write_starter_rows(uid, name) {
+        Ok(token) => token,
+        Err(err) => {
+            println!("arcade: could not reset account {}: {}", uid, err);
+            return None;
+        }
+    };
+    // The gree device certificate is the one account-owned credential that lives
+    // in another database, so it cannot ride the transaction above - but it is on
+    // delete_account's list for the same reason the two tables are, and a stale
+    // one would still name this account (database/gree.rs:98).
+    crate::database::gree::delete_uuid(uid);
+    Some(token)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::router::userdata;
+
+    fn stored(uid: i64) -> JsonValue {
+        jzon::parse(&DATABASE.lock_and_select("SELECT userdata FROM userdata WHERE user_id=?1", params!(uid)).unwrap()).unwrap()
+    }
+
+    fn row(uid: i64, table: &str) -> String {
+        DATABASE.lock_and_select(&format!("SELECT {0} FROM {0} WHERE user_id=?1", table), params!(uid)).unwrap()
+    }
+
+    // A created account is already past the tutorial: named, nine cards, a full
+    // deck with the favourite in the centre, gems, title, bond and full stamina
+    #[test]
+    fn a_created_account_is_tutorial_complete() {
+        let _lock = crate::runtime::lock_test_data_path();
+
+        let (uid, token) = create("Cabinet 1").unwrap();
+        assert_eq!(userdata::uid_from_login_token(&token), uid);
+
+        let user = stored(uid);
+        assert_eq!(user["user"]["id"].as_i64(), Some(uid));
+        assert_eq!(user["user"]["name"].as_str(), Some("Cabinet 1"));
+        // 130 is what every gate downstream tests for (live.rs:92, :385, :435)
+        assert_eq!(user["tutorial_step"].as_i64(), Some(130));
+        assert_eq!(user["stamina"]["stamina"].as_i64(), Some(100));
+        assert_eq!(user["gem"]["free"].as_i64(), Some(3000));
+        assert_eq!(user["gem"]["total"].as_i64(), Some(3000));
+        assert_eq!(user["user"]["master_title_ids"][0].as_i64(), Some(3000001));
+        assert_eq!(user["user"]["favorite_master_card_id"].as_i64(), Some(STARTER_UR));
+        assert_eq!(user["character_list"][0]["master_character_id"].as_i64(), Some(STARTER_CHARACTER_ID));
+
+        assert_eq!(user["card_list"].len(), STARTER_CARDS.len());
+        for id in STARTER_CARDS {
+            assert!(user["card_list"].members().any(|c| c["master_card_id"] == *id), "missing {}", id);
+        }
+
+        // The deck is whole: nine distinct cards, the favourite in the centre
+        let deck = &user["deck_list"][0]["main_card_ids"];
+        assert_eq!(deck.len(), 9);
+        assert_eq!(deck[4].as_i64(), Some(STARTER_UR));
+        let mut seen = Vec::new();
+        for slot in deck.members() {
+            let id = slot.as_i64().unwrap();
+            assert!(id != 0, "empty deck slot");
+            assert!(!seen.contains(&id), "duplicate card {} in the deck", id);
+            seen.push(id);
+        }
+
+        // The home row carries the favourite too, and every side row exists
+        assert_eq!(jzon::parse(&row(uid, "userhome")).unwrap()["home"]["preset_setting"][0]["illust_master_card_id"].as_i64(), Some(STARTER_UR));
+        assert_eq!(row(uid, "sifcards"), "[]");
+        assert_eq!(row(uid, "exchange"), "[]");
+        assert_eq!(row(uid, "event"), "{}");
+        assert!(!jzon::parse(&row(uid, "missions")).unwrap().is_empty());
+        assert!(!jzon::parse(&row(uid, "chats")).unwrap().is_empty());
+
+        // The account is NOT one of the dead ones the purge sweeper collects
+        // (mod.rs:792-801): it has cards, a real name and step 130
+        assert!(!user["card_list"].is_empty());
+        assert_ne!(user["user"]["name"].as_str(), Some("Tutorial in progress"));
+    }
+
+    // The guest reset keeps the identity and the token and throws away
+    // everything the last player did with it
+    #[test]
+    fn a_reset_keeps_the_identity_and_wipes_the_progress() {
+        let _lock = crate::runtime::lock_test_data_path();
+
+        let (uid, token) = create("GUEST").unwrap();
+
+        // A credit's worth of play, on every row a reset has to reach
+        let mut user = stored(uid);
+        user["user"]["name"] = "Somebody".into();
+        user["user"]["exp"] = (12345).into();
+        user["stamina"]["stamina"] = (3).into();
+        user["gem"]["free"] = (99999).into();
+        user["live_list"].push(object!{ master_live_id: 1100101, level: 4, clear_count: 7, high_score: 654321, max_combo: 300 }).unwrap();
+        user["live_mission_list"].push(object!{ master_live_id: 1100101, clear_master_live_mission_ids: [1, 2] }).unwrap();
+        user["item_list"].push(object!{ id: 17001001, master_item_id: 17001001, amount: 50 }).unwrap();
+        user["card_list"].push(object!{ id: 10010013, master_card_id: 10010013, exp: 0, skill_exp: 0, evolve: [], created_date_time: 0 }).unwrap();
+        userdata::save_acc(&token, user);
+        userdata::save_acc_friends(&token, object!{
+            friend_user_id_list: [1],
+            request_user_id_list: [],
+            pending_user_id_list: []
+        });
+        userdata::save_server_data(&token, object!{ last_live_started: [object!{ master_live_id: 1100101 }] });
+        userdata::save_acc_exchange(&token, array![1, 2, 3]);
+
+        let new_token = reset(uid, "Cabinet 1").expect("the reset was refused");
+
+        // Same account, a new login token - the cabinet is handed the new one in
+        // the /api/arcade/session answer, and the previous player's copy of the
+        // old one now names nothing
+        assert_ne!(new_token, token, "the guest's login token was reused");
+        assert_eq!(userdata::uid_from_login_token(&new_token), uid);
+        assert_eq!(userdata::uid_from_login_token(&token), 0, "the previous credit's token still logs in");
+
+        let user = stored(uid);
+        assert_eq!(user["user"]["id"].as_i64(), Some(uid));
+        assert_eq!(user["user"]["name"].as_str(), Some("Cabinet 1"));
+        assert_eq!(user["user"]["exp"].as_i64(), Some(0));
+        assert_eq!(user["stamina"]["stamina"].as_i64(), Some(100));
+        assert_eq!(user["gem"]["free"].as_i64(), Some(3000));
+        assert_eq!(user["live_list"].len(), 0);
+        assert_eq!(user["live_mission_list"].len(), 0);
+        assert_eq!(user["item_list"].len(), 0);
+        assert_eq!(user["card_list"].len(), STARTER_CARDS.len());
+        assert_eq!(user["deck_list"][0]["main_card_ids"][4].as_i64(), Some(STARTER_UR));
+
+        // Every side row went back too
+        assert_eq!(jzon::parse(&row(uid, "friends")).unwrap()["friend_user_id_list"].len(), 0);
+        assert!(jzon::parse(&row(uid, "server_data")).unwrap()["last_live_started"].is_null());
+        assert_eq!(row(uid, "exchange"), "[]");
+    }
+
+    // Resetting something that is not an account is refused rather than
+    // conjuring one out of nothing
+    #[test]
+    fn resetting_an_unknown_account_is_refused() {
+        let _lock = crate::runtime::lock_test_data_path();
+        assert!(reset(123, "Cabinet 1").is_none());
+    }
+
+    // A guest is handed to a stranger every credit, so a reset has to take every
+    // credential the last player could have left on it - not just the progress.
+    // The list is delete_account's (mod.rs:791) minus the rows the starter write
+    // rewrites and the token it re-draws.
+    #[test]
+    fn a_reset_takes_every_credential_the_last_player_left() {
+        let _lock = crate::runtime::lock_test_data_path();
+
+        let (uid, token) = create("GUEST").unwrap();
+
+        // The previous player, on the cabinet during their credit: a transfer
+        // code and password (/api/user/registerpassword), a webui session logged
+        // in with them, and a gree device certificate.
+        let code = userdata::user::migration::save_acc_transfer(uid, "hunter2");
+        assert!(userdata::has_transfer_password(uid));
+        let webui_token = userdata::webui_login(uid, "hunter2").expect("the webui login was refused");
+        assert_eq!(userdata::webui_login_token(&webui_token).as_deref(), Some(token.as_str()));
+        crate::database::gree::update_cert(uid, "a device certificate");
+        assert!(crate::database::gree::get_user_cert(&token).is_some());
+
+        let new_token = reset(uid, "Cabinet 1").expect("the reset was refused");
+
+        // The transfer code and password are gone: neither the game's own
+        // takeover check nor the webui login answers to them any more
+        assert!(!userdata::has_transfer_password(uid), "the transfer password survived the reset");
+        assert!(!userdata::user::migration::get_acc_transfer(&code, "hunter2")["success"].as_bool().unwrap_or(false),
+            "the previous player's transfer code still takes the account over");
+        assert!(userdata::webui_login(uid, "hunter2").is_err(), "the previous player can still log the webui in");
+
+        // The webui session they left open is gone too
+        assert!(userdata::webui_login_token(&webui_token).is_none(), "the previous player's webui session survived the reset");
+        assert!(userdata::webui_get_user(&webui_token).is_none());
+
+        // So is the device certificate, which named the account from a phone
+        assert!(crate::database::gree::get_user_cert(&token).is_none(), "the gree certificate survived the reset");
+        assert!(crate::database::gree::get_user_cert(&new_token).is_none());
+
+        // And the account is still perfectly usable under its new token
+        assert_eq!(userdata::uid_from_login_token(&new_token), uid);
+        assert_eq!(stored(uid)["user"]["name"].as_str(), Some("Cabinet 1"));
+    }
+
+    // Every table delete_account clears is either rewritten by the starter write,
+    // re-drawn (the token) or deleted by it. A row added to delete_account without
+    // a decision here is a leak across credits, so the lists are compared rather
+    // than trusted to have been kept in step.
+    #[test]
+    fn the_reset_accounts_for_every_table_a_deletion_clears() {
+        let rewritten = ["userdata", "userhome", "missions", "chats", "loginbonus",
+            "eventloginbonus", "sifcards", "friends", "event", "exchange", "server_data"];
+        for table in userdata::ACCOUNT_TABLES {
+            assert!(
+                rewritten.contains(table) || CARRIED_CREDENTIAL_TABLES.contains(table) || *table == "tokens",
+                "delete_account clears {} and the guest reset does nothing about it",
+                table
+            );
+        }
+        // And the side-row list really is what the reset rewrites
+        let rows = side_rows(&array![], &object!{}, &object!{});
+        for (table, _) in &rows {
+            assert!(rewritten.contains(table), "{} is written by the reset but not listed above", table);
+        }
+        assert_eq!(rows.len() + 1, rewritten.len());
+    }
+
+    // Cabinet names arrive from an operator typing into a machine
+    #[test]
+    fn names_are_clamped_not_trusted() {
+        assert_eq!(clean_name("  Cabinet 1  ", "ARCADE"), "Cabinet 1");
+        assert_eq!(clean_name("", "ARCADE"), "ARCADE");
+        assert_eq!(clean_name("   ", "ARCADE"), "ARCADE");
+        assert_eq!(clean_name("a\nb\tc", "ARCADE"), "abc");
+        assert_eq!(clean_name(&"x".repeat(200), "ARCADE").len(), MAX_NAME_LEN);
+    }
+}

src/router/userdata/user/migration.rs

@@ -38,6 +38,12 @@ pub fn get_acc_transfer(token: &str, password: &str) -> JsonValue {
     object!{success: false}
 }
 
+// Used by gree
+pub fn transfer_code_exists(token: &str) -> bool {
+    let database = userdata::get_userdata_database();
+    database.lock_and_select("SELECT password FROM migration WHERE token=?1", params!(token)).is_ok()
+}
+
 pub fn save_acc_transfer(uid: i64, password: &str) -> String {
     let database = userdata::get_userdata_database();
     let token = if let Ok(value) = database.lock_and_select("SELECT token FROM migration WHERE user_id=?1", params!(uid)) {

src/router/web.rs

@@ -1,6 +1,513 @@
-use actix_web::{HttpResponse, HttpRequest};
+use actix_web::{web, HttpRequest, HttpResponse, http::header::ContentType};
+use actix_multipart::Multipart;
+use futures_util::TryStreamExt;
+use jzon::{array, object, JsonValue};
+use include_dir::{include_dir, Dir};
+use std::collections::{HashMap, HashSet};
 
-pub fn announcement(_req: HttpRequest) -> HttpResponse {
-    
-    HttpResponse::Ok().body("sif2 is back!")
+use crate::router::{global, userdata, webui};
+use crate::database::{announcements, permissions};
+use crate::database::announcements::Banner;
+
+static ASSETS: Dir<'_> = include_dir!("web_assets/announcement/");
+
+const MAX_BANNER_BYTES: usize = 8 * 1024 * 1024;
+const MAX_BANNER_DIM: u32 = 8192;
+const MAX_SCALED_PIXELS: u64 = 16 * 1024 * 1024;
+const BANNER_W: u32 = 420;
+const BANNER_H: u32 = 168;
+
+const CATEGORY_LABELS: &[(i64, &str, &str)] = &[
+    (1, "notice", "お知らせ"),
+    (2, "update", "アップデート"),
+    (3, "bug", "不具合")
+];
+
+pub fn routes(cfg: &mut web::ServiceConfig) {
+    cfg.service(
+        web::scope("/web/announcement")
+            .route("", web::get().to(list))
+            .route("/detail", web::get().to(detail))
+            .route("/bulkRead", web::get().to(bulk_read))
+            .route("/assets/{file}", web::get().to(asset))
+            .route("/banner/{id}", web::get().to(banner_image))
+    );
+    cfg.service(
+        web::scope("/announcement")
+            .route("/list", web::get().to(admin_list))
+            .route("/create", web::post().to(create))
+            .route("/update", web::post().to(update))
+            .route("/delete", web::post().to(delete))
+            .route("/banner/{id}", web::get().to(admin_banner_image))
+    );
+}
+
+fn disabled() -> bool {
+    crate::get_args().hidden
+}
+
+fn query_i64(req: &HttpRequest, key: &str, def: i64) -> i64 {
+    req.query_string()
+        .split('&')
+        .find(|s| s.starts_with(&format!("{key}=")))
+        .and_then(|s| s.split('=').nth(1))
+        .and_then(|v| v.parse::<i64>().ok())
+        .unwrap_or(def)
+}
+
+fn player_key(req: &HttpRequest) -> Option<String> {
+    let key = global::get_login(req.headers(), "");
+    if key.is_empty() { None } else { Some(key) }
+}
+
+fn read_set(req: &HttpRequest) -> HashSet<i64> {
+    match player_key(req) {
+    Some(key) => { println!("Player has key"); userdata::get_acc_home(&key)["home"]["read_announcement_ids"].members().filter_map(|v| v.as_i64()).collect()},
+        None => { println!("No player key"); HashSet::new() }
+    }
+}
+
+fn mark_read(key: &str, ids: &[i64]) {
+    let mut user = userdata::get_acc_home(key);
+    let mut set: HashSet<i64> = user["home"]["read_announcement_ids"].members().filter_map(|v| v.as_i64()).collect();
+    for id in ids {
+        set.insert(*id);
+    }
+    let mut sorted: Vec<i64> = set.into_iter().collect();
+    sorted.sort();
+    let mut arr = array![];
+    for id in sorted {
+        arr.push(id).unwrap();
+    }
+    user["home"]["read_announcement_ids"] = arr;
+    userdata::save_acc_home(key, user);
+}
+
+fn display_date(published_at: i64) -> String {
+    if published_at <= 0 {
+        return String::new();
+    }
+    let s = global::format_datetime(published_at as u64);
+    format!("{}/{}/{} {}", &s[0..4], &s[5..7], &s[8..10], &s[11..16])
+}
+
+fn page_head() -> String {
+    String::from(r#"<!DOCTYPE html>n<html lang="ja-JP"><head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<meta charset="utf-8">
+<meta name="viewport" content="width=320, initial-scale=1.0, user-scalable=no">
+<meta name="format-detection" content="telephone=no">
+<meta name="robots" content="noindex,nofollow">
+<link rel="stylesheet" href="/web/announcement/assets/sanitize.css" type="text/css">
+<link rel="stylesheet" href="/web/announcement/assets/news_common.css" type="text/css">
+<style>#tab div.on{background-image:none;background-color:#f93981;border-radius:0.6vw;}#news_list hr,#detail hr{background-image:none;background-color:#dfe6e6;}</style>
+<script src="/web/announcement/assets/jquery-3.6.0.min.js"></script>
+<script>var clicked=false;$(function(){$("a.once").on('click',function(){if(clicked){return false;}clicked=true;return true;});});window.addEventListener('pageshow',function(e){if(e.persisted){clicked=false;}});</script>
+</head><body>"#)
+}
+
+fn page_foot() -> String {
+    String::from("</body></html>")
+}
+
+fn tab_bar(active: i64, read: &HashSet<i64>, bulk: bool) -> String {
+    let mut tabs = String::new();
+    for (cat, class, label) in CATEGORY_LABELS {
+        let unread = !bulk && announcements::visible_ids(Some(*cat)).iter().any(|id| !read.contains(id));
+        let badge = if unread {
+            String::from("<span class=\"new\"><img class=\"bg_badge_eff\" src=\"/web/announcement/assets/news_bg_badge_eff.png\"><img class=\"bg_badge\" src=\"/web/announcement/assets/news_bg_badge.png\"></span>")
+        } else {
+            String::new()
+        };
+        let inner = if *cat == active {
+            format!("<div class=\"on\">{label}</div>")
+        } else {
+            format!("<a class=\"once\" href=\"/web/announcement?category={cat}\">{label}</a>")
+        };
+        tabs.push_str(&format!("<div class=\"{class}\">{badge}{inner}</div>"));
+    }
+    let read_btn = if bulk {
+        String::from("<div class=\"read_btn\"><img class=\"off\" src=\"/web/announcement/assets/news_btn_bulk.png\"></div>")
+    } else {
+        format!("<div class=\"read_btn\"><a class=\"once\" href=\"/web/announcement/bulkRead?category={active}&amp;page=1\"><img src=\"/web/announcement/assets/news_btn_bulk.png\"></a></div>")
+    };
+    format!("<div id=\"header\"><div id=\"tab\">{tabs}{read_btn}</div></div><div id=\"tab_bottom\"></div>")
+}
+
+fn render_list(category: i64, read: &HashSet<i64>, bulk: bool) -> String {
+    let mut list = String::new();
+    let items = announcements::list_category(category);
+    if items.is_empty() {
+        list.push_str(&format!(r#"
+<div class="info_title"><span class="title_text">No announcements right now</span></div>
+"#));
+    }
+
+    for item in items.members() {
+        let id = item["id"].as_i64().unwrap_or(0);
+        let banner_url = if item["has_banner"].as_bool().unwrap_or(false) {
+            format!("/web/announcement/banner/{id}.png")
+        } else {
+            String::from("/web/announcement/assets/news_banner_generic_news.png")
+        };
+        let kind = item["type"].as_str().unwrap_or("news");
+        let date = display_date(item["published_at"].as_i64().unwrap_or(0));
+        let update_text = if item["updated"].as_bool().unwrap_or(false) { "<span class=\"update_text\">- update</span>" } else { "" };
+        let new_badge = if !bulk && !read.contains(&id) {
+            String::from("<div class=\"info_new_image\"><img class=\"new\" src=\"/web/announcement/assets/news_icon_new.png\"></div>")
+        } else {
+            String::new()
+        };
+        let title = item["title"].as_str().unwrap_or("");
+        list.push_str(&format!(r#"
+<li class="list_area"><div class="information_area"><div id="{id}" class="anchor"></div>
+<a href="/web/announcement/detail?announcement_id={id}&amp;page=1" class="news">
+<div class="main_image"><span class="banner"><img src="{banner_url}"></span></div>
+<div class="information">
+<div class="info_type_image"><img class="tag" src="/web/announcement/assets/news_icon_{kind}.png"></div>
+<div class="info_date"><span class="date_text">{date}</span>{update_text}</div>
+{new_badge}
+<div class="clear"></div>
+<div class="info_title"><span class="title_text">{title}</span></div>
+</div>
+<div class="arrow_image"><img class="arrow" src="/web/announcement/assets/news_img_arrow.png"></div>
+</a></div><div class="clear"></div><hr></li>
+"#));
+    }
+    
+    format!("{}{}<div id=\"news_list\"><ul>{}</ul><div id=\"page_area\"><div id=\"paging\"><span class=\"page off\">1</span></div></div></div>{}",
+        page_head(), tab_bar(category, read, bulk), list, page_foot())
+}
+
+fn render_detail(item: &JsonValue, read: &HashSet<i64>) -> String {
+    let category = item["category"].as_i64().unwrap_or(1);
+    let title = item["title"].as_str().unwrap_or("");
+    let date = display_date(item["published_at"].as_i64().unwrap_or(0));
+    let body = item["body"].as_str().unwrap_or("");
+    let banner = if item["has_banner"].as_bool().unwrap_or(false) {
+        let id = item["id"].as_i64().unwrap_or(0);
+        format!("<div class=\"detail_image\" style=\"display:block\"><img src=\"/web/announcement/banner/{id}.png\"></div>")
+    } else {
+        String::new()
+    };
+    format!("{}{}<div id=\"detail\"><div class=\"detail_text\"><div class=\"title\">{title}</div><div class=\"date\">{date}</div>{banner}<hr class=\"hr_detail\">{body}</div></div>{}",
+        page_head(), tab_bar(category, read, false), page_foot())
+}
+
+fn html(body: String) -> HttpResponse {
+    HttpResponse::Ok()
+        .insert_header(ContentType::html())
+        .body(body)
+}
+
+fn redirect_list(category: i64) -> HttpResponse {
+    HttpResponse::Found()
+        .insert_header(("Location", format!("/web/announcement?category={category}")))
+        .body("")
+}
+
+async fn list(req: HttpRequest) -> HttpResponse {
+    let category = query_i64(&req, "category", 1);
+    let category = if announcements::is_valid_category(category) { category } else { 1 };
+    html(render_list(category, &read_set(&req), false))
+}
+
+async fn detail(req: HttpRequest) -> HttpResponse {
+    let id = query_i64(&req, "announcement_id", 0);
+    let Some(item) = announcements::get(id) else {
+        return redirect_list(1);
+    };
+    if !item["visible"].as_bool().unwrap_or(false) {
+        return redirect_list(item["category"].as_i64().unwrap_or(1));
+    }
+    if let Some(key) = player_key(&req) {
+        mark_read(&key, &[id]);
+    }
+    html(render_detail(&item, &read_set(&req)))
+}
+
+async fn bulk_read(req: HttpRequest) -> HttpResponse {
+    let category = query_i64(&req, "category", 1);
+    let category = if announcements::is_valid_category(category) { category } else { 1 };
+    if let Some(key) = player_key(&req) {
+        mark_read(&key, &announcements::visible_ids(Some(category)));
+    }
+    html(render_list(category, &read_set(&req), true))
+}
+
+async fn asset(req: HttpRequest) -> HttpResponse {
+    let file = req.match_info().get("file").unwrap_or("");
+    let Some(file) = ASSETS.get_file(file) else {
+        return HttpResponse::NotFound().finish();
+    };
+    let body = file.contents();
+    let mime = mime_guess::from_path(file.path()).first_or_octet_stream();
+    HttpResponse::Ok()
+        .insert_header(ContentType(mime))
+        .insert_header(("content-length", body.len()))
+        .body(body)
+}
+
+fn png_response(bytes: Option<Vec<u8>>) -> HttpResponse {
+    match bytes {
+        Some(bytes) => HttpResponse::Ok()
+            .insert_header(ContentType::png())
+            .insert_header(("content-length", bytes.len()))
+            .body(bytes),
+        None => HttpResponse::NotFound().finish()
+    }
+}
+
+fn banner_id(req: &HttpRequest) -> i64 {
+    req.match_info().get("id").unwrap_or("").trim_end_matches(".png").parse::<i64>().unwrap_or(0)
+}
+
+async fn banner_image(req: HttpRequest) -> HttpResponse {
+    png_response(announcements::get_public_banner(banner_id(&req)))
+}
+
+async fn admin_banner_image(req: HttpRequest) -> HttpResponse {
+    if disabled() {
+        return HttpResponse::NotFound().finish();
+    }
+    if manager_uid(&req).filter(|uid| permissions::has(*uid, permissions::ANNOUNCEMENT_MANAGE)).is_none() {
+        return HttpResponse::NotFound().finish();
+    }
+    png_response(announcements::get_banner(banner_id(&req)))
+}
+
+type Fields = HashMap<String, Vec<u8>>;
+
+async fn read_multipart(mut payload: Multipart) -> Result<Fields, String> {
+    let mut fields = Fields::new();
+    let mut total = 0usize;
+    while let Some(mut field) = payload.try_next().await.map_err(|e| e.to_string())? {
+        let name = field.name().unwrap_or("").to_string();
+        let mut data = Vec::new();
+        while let Some(chunk) = field.try_next().await.map_err(|e| e.to_string())? {
+            total += chunk.len();
+            if total > MAX_BANNER_BYTES {
+                return Err(format!("Upload exceeds the {} MB limit", MAX_BANNER_BYTES / (1024 * 1024)));
+            }
+            data.extend_from_slice(&chunk);
+        }
+        fields.insert(name, data);
+    }
+    Ok(fields)
+}
+
+fn field_str(fields: &Fields, key: &str) -> String {
+    String::from_utf8_lossy(fields.get(key).map(|v| v.as_slice()).unwrap_or(&[])).trim().to_string()
+}
+
+fn field_flag(fields: &Fields, key: &str) -> bool {
+    matches!(field_str(fields, key).to_lowercase().as_str(), "1" | "true" | "on")
+}
+
+fn file_of<'a>(fields: &'a Fields, key: &str) -> Option<&'a Vec<u8>> {
+    fields.get(key).filter(|v| !v.is_empty())
+}
+
+fn process_banner(bytes: &[u8]) -> Result<Vec<u8>, String> {
+    let img = image::load_from_memory(bytes).map_err(|_| String::from("The banner is not a decodable image (png, jpg and webp work)"))?;
+    if img.width() > MAX_BANNER_DIM || img.height() > MAX_BANNER_DIM {
+        return Err(format!("The banner is {}x{} - neither side may exceed {}px", img.width(), img.height(), MAX_BANNER_DIM));
+    }
+    let img = img.to_rgba8();
+    let scale = f64::max(BANNER_W as f64 / img.width() as f64, BANNER_H as f64 / img.height() as f64);
+    let scaled_w = ((img.width() as f64 * scale).round() as u32).max(1);
+    let scaled_h = ((img.height() as f64 * scale).round() as u32).max(1);
+    if (scaled_w as u64) * (scaled_h as u64) > MAX_SCALED_PIXELS {
+        return Err(format!("The banner is too far from the {}x{} banner shape to be cropped", BANNER_W, BANNER_H));
+    }
+    let scaled = image::imageops::resize(&img, scaled_w, scaled_h, image::imageops::FilterType::Lanczos3);
+    let x = (scaled.width() - BANNER_W.min(scaled.width())) / 2;
+    let y = (scaled.height() - BANNER_H.min(scaled.height())) / 2;
+    let cropped = image::imageops::crop_imm(&scaled, x, y, BANNER_W, BANNER_H).to_image();
+    let mut rv = Vec::new();
+    image::DynamicImage::ImageRgba8(cropped).write_to(&mut std::io::Cursor::new(&mut rv), image::ImageFormat::Png).map_err(|e| e.to_string())?;
+    Ok(rv)
+}
+
+fn send_json(resp: JsonValue) -> HttpResponse {
+    HttpResponse::Ok()
+        .insert_header(ContentType::json())
+        .body(jzon::stringify(resp))
+}
+
+fn manager_uid(req: &HttpRequest) -> Option<i64> {
+    let token = webui::get_login_token(req)?;
+    let login_token = userdata::webui_login_token(&token)?;
+    userdata::get_acc(&login_token)["user"]["id"].as_i64()
+}
+
+fn require_manager(req: &HttpRequest) -> Result<i64, HttpResponse> {
+    if disabled() {
+        return Err(HttpResponse::NotFound().finish());
+    }
+    let Some(uid) = manager_uid(req) else {
+        return Err(webui::error("Not logged in"));
+    };
+    if !permissions::has(uid, permissions::ANNOUNCEMENT_MANAGE) {
+        return Err(webui::error("You do not have permission to manage announcements"));
+    }
+    Ok(uid)
+}
+
+async fn admin_list(req: HttpRequest) -> HttpResponse {
+    if let Err(resp) = require_manager(&req) {
+        return resp;
+    }
+    let mut categories = array![];
+    for (id, key, label) in CATEGORY_LABELS {
+        categories.push(object!{ id: *id, key: *key, label: *label }).unwrap();
+    }
+    let mut types = array![];
+    for kind in announcements::TYPES {
+        types.push(*kind).unwrap();
+    }
+    send_json(object!{
+        result: "OK",
+        data: {
+            announcements: announcements::get_all(),
+            categories: categories,
+            types: types
+        }
+    })
+}
+
+async fn create(req: HttpRequest, payload: Multipart) -> HttpResponse {
+    let uid = match require_manager(&req) {
+        Ok(uid) => uid,
+        Err(resp) => return resp
+    };
+    let fields = match read_multipart(payload).await {
+        Ok(fields) => fields,
+        Err(e) => return webui::error(&e)
+    };
+    match save_new(uid, &fields) {
+        Ok(id) => send_json(object!{ result: "OK", id: id }),
+        Err(e) => webui::error(&e)
+    }
+}
+
+fn published_at_of(raw: &str) -> i64 {
+    if raw.is_empty() {
+        global::timestamp() as i64
+    } else {
+        global::parse_datetime(raw).map(|t| t as i64).unwrap_or_else(|| global::timestamp() as i64)
+    }
+}
+
+fn save_new(uid: i64, fields: &Fields) -> Result<i64, String> {
+    let category = field_str(fields, "category").parse::<i64>().unwrap_or(0);
+    if !announcements::is_valid_category(category) {
+        return Err(String::from("Invalid category"));
+    }
+    let kind = field_str(fields, "type");
+    if !announcements::is_valid_type(&kind) {
+        return Err(String::from("Invalid type"));
+    }
+    let title = field_str(fields, "title");
+    if title.is_empty() {
+        return Err(String::from("A title is required"));
+    }
+    let body = field_str(fields, "body");
+    let banner = match file_of(fields, "banner") {
+        Some(bytes) => Some(process_banner(bytes)?),
+        None => None
+    };
+    Ok(announcements::create(category, &kind, &title, &body, banner, field_flag(fields, "updated"), !field_flag(fields, "hidden"), published_at_of(&field_str(fields, "published_at")), uid))
+}
+
+async fn update(req: HttpRequest, payload: Multipart) -> HttpResponse {
+    if let Err(resp) = require_manager(&req) {
+        return resp;
+    }
+    let fields = match read_multipart(payload).await {
+        Ok(fields) => fields,
+        Err(e) => return webui::error(&e)
+    };
+    match save_update(&fields) {
+        Ok(id) => send_json(object!{ result: "OK", id: id }),
+        Err(e) => webui::error(&e)
+    }
+}
+
+fn save_update(fields: &Fields) -> Result<i64, String> {
+    let id = field_str(fields, "id").parse::<i64>().unwrap_or(0);
+    let Some(stored) = announcements::get(id) else {
+        return Err(String::from("That announcement no longer exists"));
+    };
+    let category = field_str(fields, "category").parse::<i64>().unwrap_or(0);
+    if !announcements::is_valid_category(category) {
+        return Err(String::from("Invalid category"));
+    }
+    let kind = field_str(fields, "type");
+    if !announcements::is_valid_type(&kind) {
+        return Err(String::from("Invalid type"));
+    }
+    let title = field_str(fields, "title");
+    if title.is_empty() {
+        return Err(String::from("A title is required"));
+    }
+    let body = field_str(fields, "body");
+    let banner = if let Some(bytes) = file_of(fields, "banner") {
+        Banner::Set(process_banner(bytes)?)
+    } else if field_flag(fields, "remove_banner") {
+        Banner::Clear
+    } else {
+        Banner::Keep
+    };
+    let published_at = if field_str(fields, "published_at").is_empty() {
+        stored["published_at"].as_i64().unwrap_or_else(|| global::timestamp() as i64)
+    } else {
+        published_at_of(&field_str(fields, "published_at"))
+    };
+    announcements::update(id, category, &kind, &title, &body, banner, field_flag(fields, "updated"), !field_flag(fields, "hidden"), published_at);
+    Ok(id)
+}
+
+async fn delete(req: HttpRequest, body: String) -> HttpResponse {
+    if let Err(resp) = require_manager(&req) {
+        return resp;
+    }
+    let body = jzon::parse(&body).unwrap_or(object!{});
+    let id = body["id"].as_i64().unwrap_or(0);
+    if announcements::get(id).is_none() {
+        return webui::error("That announcement no longer exists");
+    }
+    announcements::delete(id);
+    send_json(object!{ result: "OK" })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn png(w: u32, h: u32) -> Vec<u8> {
+        let img = image::RgbaImage::from_pixel(w, h, image::Rgba([120, 90, 200, 255]));
+        let mut rv = Vec::new();
+        image::DynamicImage::ImageRgba8(img).write_to(&mut std::io::Cursor::new(&mut rv), image::ImageFormat::Png).unwrap();
+        rv
+    }
+
+    #[test]
+    fn banners_are_cropped_to_the_official_size() {
+        for (w, h) in [(420, 168), (1200, 300), (300, 1200), (64, 64)] {
+            let out = process_banner(&png(w, h)).unwrap();
+            let decoded = image::load_from_memory(&out).unwrap();
+            assert_eq!((decoded.width(), decoded.height()), (BANNER_W, BANNER_H), "source {}x{}", w, h);
+        }
+        assert!(process_banner(b"not an image").unwrap_err().contains("not a decodable image"));
+    }
+
+    #[test]
+    fn extreme_sources_are_refused_before_the_resize_allocates() {
+        let err = process_banner(&png(9000, 32)).unwrap_err();
+        assert!(err.contains("9000x32"), "got {}", err);
+
+        let err = process_banner(&png(24, 6000)).unwrap_err();
+        assert!(err.contains("banner shape"), "got {}", err);
+    }
 }

src/router/webui.rs

@@ -229,6 +229,8 @@ pub fn server_info(_req: HttpRequest) -> HttpResponse {
             account_import: get_config()["import"].as_bool().unwrap(),
             custom_songs: !crate::router::custom_song::disabled(),
             custom_cards: !crate::router::custom_card::disabled(),
+            custom_3dmv: !crate::router::custom_3dmv::disabled(),
+            arcade: !crate::router::arcade::disabled(),
             links: {
                 global: args.global_android,
                 japan: args.japan_android,
@@ -367,9 +369,6 @@ pub fn list_items(_req: HttpRequest) -> HttpResponse {
 }
 
 lazy_static! {
-    // The selectable character list for the custom-card form: every official
-    // and SIF1-imported character in the baked csv, by name. The import band
-    // starts at 5001 (5001-5172 + 6001-6009); official ids top out at 4014
     static ref CHARACTER_CHOICES: JsonValue = {
         let mut rv = jzon::array![];
         for row in crate::router::databases::csv::table(Region::Jp, "character").members() {
@@ -384,8 +383,6 @@ lazy_static! {
         rv
     };
 
-    // The skill_center table with its display strings, for picking a center
-    // skill by name instead of by raw id
     static ref SKILL_CENTER_CHOICES: JsonValue = {
         let mut en_rows = object!{};
         for row in crate::router::databases::csv::table(Region::En, "skill_center").members() {
@@ -406,9 +403,6 @@ lazy_static! {
     };
 }
 
-// The characters a card upload may reference, for the webui's searchable
-// picker: the baked official + imported list, plus the custom characters
-// this session may build on (their own and the publicly visible ones)
 pub fn list_characters(req: HttpRequest) -> HttpResponse {
     let Some(uid) = session_uid(&req) else {
         return error("Not logged in");
@@ -446,8 +440,6 @@ pub fn list_skill_centers(req: HttpRequest) -> HttpResponse {
         .body(jzon::stringify(resp))
 }
 
-// The concrete upload bounds (per-rarity stat caps, enum ranges, skill array
-// lengths) so the form enforces them before submitting
 pub fn custom_card_limits(req: HttpRequest) -> HttpResponse {
     if session_uid(&req).is_none() {
         return error("Not logged in");
@@ -461,8 +453,22 @@ pub fn custom_card_limits(req: HttpRequest) -> HttpResponse {
         .body(jzon::stringify(resp))
 }
 
-// The requesting user's own effective scopes, for webui nav gating. Any
-// session may ask - it only ever reveals what the user themselves holds
+pub fn custom_3dmv_limits(req: HttpRequest) -> HttpResponse {
+    if crate::router::custom_3dmv::disabled() {
+        return HttpResponse::NotFound().finish();
+    }
+    if session_uid(&req).is_none() {
+        return error("Not logged in");
+    }
+    let resp = object!{
+        result: "OK",
+        data: crate::router::custom_3dmv::upload_limits()
+    };
+    HttpResponse::Ok()
+        .insert_header(ContentType::json())
+        .body(jzon::stringify(resp))
+}
+
 pub fn my_scopes(req: HttpRequest) -> HttpResponse {
     let Some(uid) = session_uid(&req) else {
         return error("Not logged in");
@@ -471,12 +477,18 @@ pub fn my_scopes(req: HttpRequest) -> HttpResponse {
         result: "OK",
         data: {
             uid: uid,
-            scopes: permissions::scopes_for(uid),
+            scopes: permissions::get_user_permissions(uid),
             can_upload_cards: permissions::has(uid, permissions::CARD_UPLOAD),
             can_publish_cards: permissions::has(uid, permissions::CARD_PUBLISH),
             can_edit_any_cards: permissions::has(uid, permissions::CARD_EDIT),
+            can_edit_any_3dmv: permissions::has(uid, permissions::MV_EDIT),
             can_manage_permissions: permissions::has(uid, permissions::PERMISSION_GRANT)
-                || permissions::has(uid, permissions::PERMISSION_REVOKE)
+                || permissions::has(uid, permissions::PERMISSION_REVOKE),
+            can_manage_announcements: permissions::has(uid, permissions::ANNOUNCEMENT_MANAGE),
+            // Cabinets are server hardware, not user content: there is no
+            // finer-grained arcade scope, so managing them takes the top-level
+            // one that every --owner uid holds implicitly
+            can_manage_arcade: !crate::router::arcade::disabled() && permissions::has(uid, permissions::ALL)
         }
     };
     HttpResponse::Ok()
@@ -484,8 +496,6 @@ pub fn my_scopes(req: HttpRequest) -> HttpResponse {
         .body(jzon::stringify(resp))
 }
 
-// The admin view: every grant plus the grantable vocabulary. Needs a
-// permission.* scope - my_scopes is the anyone-can-ask endpoint
 pub fn list_permissions(req: HttpRequest) -> HttpResponse {
     let Some(uid) = session_uid(&req) else {
         return error("Not logged in");
@@ -505,7 +515,7 @@ pub fn list_permissions(req: HttpRequest) -> HttpResponse {
             uid: uid,
             can_grant: can_grant,
             can_revoke: can_revoke,
-            scopes: permissions::scopes_for(uid),
+            scopes: permissions::get_user_permissions(uid),
             available: available,
             grants: permissions::grants()
         }
@@ -552,6 +562,84 @@ pub fn revoke_permission(req: HttpRequest, body: String) -> HttpResponse {
         .body(jzon::stringify(resp))
 }
 
+// The operator's cabinet list. Owner scope only: a machine row names the two
+// accounts a cabinet owns, and removing one deletes them.
+pub fn list_arcade_machines(req: HttpRequest) -> HttpResponse {
+    if crate::router::arcade::disabled() {
+        return HttpResponse::NotFound().finish();
+    }
+    let Some(uid) = session_uid(&req) else {
+        return error("Not logged in");
+    };
+    if !permissions::has(uid, permissions::ALL) {
+        return error("You do not have permission to manage arcade machines");
+    }
+    let resp = object!{
+        result: "OK",
+        data: {
+            machines: crate::router::arcade::webui_machines()
+        }
+    };
+    HttpResponse::Ok()
+        .insert_header(ContentType::json())
+        .body(jzon::stringify(resp))
+}
+
+pub fn remove_arcade_machine(req: HttpRequest, body: String) -> HttpResponse {
+    if crate::router::arcade::disabled() {
+        return HttpResponse::NotFound().finish();
+    }
+    let Some(uid) = session_uid(&req) else {
+        return error("Not logged in");
+    };
+    if !permissions::has(uid, permissions::ALL) {
+        return error("You do not have permission to manage arcade machines");
+    }
+    let body = jzon::parse(&body).unwrap_or(object!{});
+    if let Err(e) = crate::router::arcade::webui_remove_machine(body["machine_id"].as_str().unwrap_or("")) {
+        return error(&e);
+    }
+    let resp = object!{
+        result: "OK"
+    };
+    HttpResponse::Ok()
+        .insert_header(ContentType::json())
+        .body(jzon::stringify(resp))
+}
+
+// The account page's "bind arcade card" form. The cabinet's own endpoint speaks
+// the encrypted game protocol behind the asset gate, which a browser cannot, so
+// this is the browser's door onto the same rule - arcade::bind_card, not a copy
+// of it. A webui session is required on top of the transfer code and password:
+// the page is behind login anyway, and the extra proof costs nothing.
+pub fn bind_arcade_card(req: HttpRequest, body: String) -> HttpResponse {
+    if crate::router::arcade::disabled() {
+        return HttpResponse::NotFound().finish();
+    }
+    if session_uid(&req).is_none() {
+        return error("Not logged in");
+    }
+    let body = jzon::parse(&body).unwrap_or(object!{});
+    match crate::router::arcade::bind_card(
+        body["card_id"].as_str().unwrap_or(""),
+        body["migrationCode"].as_str().unwrap_or(""),
+        body["pass"].as_str().unwrap_or("")
+    ) {
+        Ok(user_id) => {
+            let resp = object!{
+                result: "OK",
+                data: {
+                    user_id: user_id
+                }
+            };
+            HttpResponse::Ok()
+                .insert_header(ContentType::json())
+                .body(jzon::stringify(resp))
+        },
+        Err(reason) => error(&reason)
+    }
+}
+
 pub fn cheat(req: HttpRequest, _body: String) -> HttpResponse {
     let token = get_login_token(&req);
     if token.is_none() {
@@ -592,6 +680,11 @@ pub fn cheat(req: HttpRequest, _body: String) -> HttpResponse {
         .body(jzon::stringify(resp))
 }
 
+
+
+// rest of file is tests that ai wrote
+// I didn't read through them because I don't super care about tests but they probably do something
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/runtime.rs

@@ -25,6 +25,7 @@ pub struct HostConfig {
     pub en_android_asset_hash: String,
     pub enable_custom_songs: bool,
     pub enable_custom_cards: bool,
+    pub enable_custom_3dmv: bool,
 }
 
 // Lets an embedding app (or the tests) enable the opt-in custom songs feature
@@ -37,6 +38,10 @@ pub fn set_enable_custom_cards(enabled: bool) {
     HOST_CONFIG.write().unwrap().enable_custom_cards = enabled;
 }
 
+pub fn set_enable_custom_3dmv(enabled: bool) {
+    HOST_CONFIG.write().unwrap().enable_custom_3dmv = enabled;
+}
+
 // The --owner uids: the permission system's bootstrap grantors. Process-level
 // state rather than db rows so they work on a fresh install and can't be
 // revoked through the webui
@@ -162,14 +167,17 @@ pub fn overlay_args(args: &mut crate::options::Args) {
     }
     overlay_str!(jp_android_asset_hash);
     overlay_str!(en_android_asset_hash);
-    // Overlay only ever enables the features; a command-line --enable-custom-songs
-    // / --enable-custom-cards is never overridden back to off
+    // Overlay only ever enables the features; a command-line --enable-custom-*
+    // flag is never overridden back to off
     if cfg.enable_custom_songs {
         args.enable_custom_songs = true;
     }
     if cfg.enable_custom_cards {
         args.enable_custom_cards = true;
     }
+    if cfg.enable_custom_3dmv {
+        args.enable_custom_3dmv = true;
+    }
 }
 
 // idk why an ai put tests here but they are here now. Yay tests????
@@ -192,5 +200,6 @@ pub fn lock_test_data_path() -> std::sync::MutexGuard<'static, ()> {
     // while holding the lock
     set_enable_custom_songs(true);
     set_enable_custom_cards(true);
+    set_enable_custom_3dmv(true);
     guard
 }

src/sql.rs

@@ -59,4 +59,28 @@ impl SQLite {
         }
         Ok(rv)
     }
+
+    // Runs a read-modify-write as one unit. Additive on purpose — the other helpers open
+    // a fresh connection per statement, so a caller that SELECTs then INSERTs races any
+    // concurrent caller doing the same and the loser hits a constraint violation (which
+    // lock_and_exec would unwrap into a worker panic).
+    //
+    // BEGIN IMMEDIATE takes the write lock up front rather than at first write, so two
+    // callers serialise instead of both reading the pre-state; busy_timeout makes the
+    // loser wait for the winner rather than fail instantly (SQLite::new sets that on its
+    // own short-lived setup connection, not on the per-call ones).
+    //
+    // Errors are returned, never unwrapped: statistics writes must not take down a
+    // request.
+    pub fn lock_and_transact<T>(
+        &self,
+        f: impl FnOnce(&Connection) -> Result<T, rusqlite::Error>
+    ) -> Result<T, rusqlite::Error> {
+        let mut conn = Connection::open(&self.path)?;
+        conn.busy_timeout(std::time::Duration::from_secs(10))?;
+        let tx = conn.transaction_with_behavior(rusqlite::TransactionBehavior::Immediate)?;
+        let rv = f(&tx)?;
+        tx.commit()?;
+        Ok(rv)
+    }
 }

web_assets/announcement/news_common.css

@@ -0,0 +1,465 @@
+
+/*+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+
+背景設定
++-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+*/
+
+html {
+    box-sizing: border-box; /* 1 */
+    cursor: default; /* 2 */
+    line-height: 1.5; /* 3 */
+    -ms-text-size-adjust: 100%; /* 4 */
+    -webkit-text-size-adjust: 100%; /* 5 */
+}
+*,
+::before,
+::after {
+    /* 表示無い個所の処理 */
+    background-repeat: no-repeat; /* 1 */
+    box-sizing: inherit; /* 2 */
+}
+body {
+    font-family: 'YuGothic','Yu Gothic','Hiragino Kaku Gothic ProN','ヒラギノ角ゴ ProN W3',sans-serif;
+    font-size: 2.0vw;
+    font-weight: normal;
+    color: #494949;
+    background-color: #f5ffff;
+    background-size: cover;
+    background-attachment: fixed;
+    -webkit-touch-callout: none; /* リンク長押しのポップアップを無効化*/
+    -webkit-user-select: none; /* テキスト長押しの選択ボックスを無効化*/
+    -webkit-tap-highlight-color:rgba(0,0,0,0);/*リンクの領域表示を無効化*/
+}
+
+/* ダークモード */
+@media (prefers-color-scheme: dark) {
+    body {
+        background-color: #f5ffff;
+        color: #494949;
+    }
+    #header {
+        background-color: #f5ffff;
+    }
+    #tab div.on {
+        color: #f5ffff;
+    }
+    .detail_text {
+        color: #494949;
+    }
+    #tab div a, #tab div a:visited {
+        color: #494949;
+    }
+    #news_list .news .info_date {
+        color: #828282;
+    }
+}
+/*+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+
+文字大きさ、ポジション 幅1580px基準のvw
++-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+*/
+/* 詳細本文 */
+/* 40文字×無制限 */
+.detail_text {
+    font-size: 2.0vw;
+    color: #494949;
+    font-weight: normal;
+}
+
+/* 装飾用 */
+/* <div class="title"> */
+#detail .title {
+    font-weight: bold;
+}
+
+/* <span class="bold"> */
+#detail .bold {
+    font-weight: bold;
+}
+
+/* <div class="date"> */
+#detail .date {
+    color: #f93981;
+}
+
+/* <span class="pink"> */
+#detail .pink {
+    color: #f93981;
+}
+
+/* 見出し用 *
+/* 更新日 24px */
+.date_text {
+    font-size: 1.6vw;
+    font-weight: normal;
+}
+
+/* タイトル 32px */
+.title_text {
+    font-size: 2.0vw;
+    font-weight: normal;
+}
+
+.update_text {
+    font-size: 1.3vw;
+    font-weight: normal;
+}
+
+#tab {
+    font-size: 2.0vw;
+    font-weight: normal;
+}
+
+/*+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+
+メニュータブ
++-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+*/
+#header {
+    position: fixed;
+    top: 0;
+    width: 100vw;
+    height: 7.2vw;
+    background-color: #F2FFFF;
+    z-index: 1;
+}
+#tab {
+    position: relative;
+    top: 0;
+    margin: 1.6vw 1.3vw;
+    width: 97.4vw;
+    height: 4.0vw;
+    z-index: 1;
+}
+
+#tab>div {
+    float: left;
+    width: 18.9vw;
+    height: 4.0vw;
+    color: #494949;
+    text-align: center;
+    line-height: 4.0vw;
+    position: relative;
+}
+
+#tab div:nth-child(1), #tab div:nth-child(2) {
+    border-right: #CDD0D0 1px solid;
+}
+
+#tab div a, #tab div a:visited {
+    color: #494949;
+}
+
+#tab div.on {
+    color: #f5ffff;
+    background-image: url("../0_common_images/news_img_tab.png");
+    background-repeat: repeat-x;
+    background-size: contain;
+}
+
+#tab a {
+    display: block;
+    height: 100%;
+    background-position: center;
+    background-size: 15.5vw;
+    text-decoration: none;
+}
+
+#tab .tab_text {
+    text-align: center;
+    line-height: 100%;
+}
+
+#tab .new img.bg_badge {
+    position: absolute;
+    z-index: 2;
+    top: -0.5vw;
+    right: 1.1vw;
+    width: 2.4vw;
+    height: auto;
+}
+
+#tab .new img.bg_badge_eff {
+    position: absolute;
+    z-index: 1;
+    top: -1.3vw;
+    right: 0.3vw;
+    width: 4.0vw;
+    height: auto;
+}
+
+#tab>div.read_btn, #tab>div.more_btn {
+    float: right;
+    width: 15.6vw;
+    height: 4.0vw;
+    margin: 0vw -0.4vw 0vw 0.4vw;
+}
+
+#tab .read_btn img, #tab .more_btn img {
+    width: 15.6vw;
+    height: auto;
+}
+
+#tab img.off {
+    opacity: 0.5;
+}
+
+#tab_bottom {
+    margin-top: 7.2vw;
+}
+
+/*+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+
+共通項目
++-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+*/
+/*種類アイコン画像*/
+.info_type_image img.tag {
+    width : 13.7vw; /* 画像を枠の100%の横幅にする */
+    height: auto; /* 画像の縦幅を自動調整 */
+}
+
+.info_type_image img.present {
+    width : 1.5vw;
+    height: auto;
+    margin-left: 0.5vw;
+}
+
+.information_area {
+    width: 100%;
+    overflow: hidden;
+}
+
+.information {
+    position: relative;
+    float: left;
+    overflow: hidden;
+}
+
+.information img.new {
+    width : 8.3vw;
+    height: auto;
+}
+
+img.arrow {
+    width : 1.8vw;
+    height: auto;
+    margin-top: 2.4vw;
+    margin-left: 1.0vw;
+    margin-right: 0.4vw;
+}
+
+img.arrow_back {
+    width : 1.8vw;
+    height: auto;
+    margin-top: 2.4vw;
+    margin-right: 1.4vw;
+    transform: scale(-1, 1);
+}
+
+.info_title {
+    margin-top: 0vw;
+    word-break: break-all;
+}
+
+.anchor {
+    position: absolute;
+    margin-top: -7.2vw;
+}
+
+.clear {
+    clear: both;
+}
+
+#outer {
+    position:absolute;
+    top:0;
+    left:0;
+    width:100%;
+    height:100%;
+}
+
+#outer #center {
+    height:100%;
+    width:100%;
+    display:table;
+}
+
+#outer #center p {
+    display: table-cell;
+    height: 100%;
+    text-align: center;
+    vertical-align: middle;
+}
+
+/*+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+お知らせリスト設定
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*/
+#news_list .main_image img {
+    width : 20.86vw;
+    height: 8.34vw;
+    float: left;
+}
+
+#news_list .news {
+    display: block;
+    width: 100%;
+    height: 100%;
+    text-decoration: none;
+    color: #494949;
+    -webkit-tap-highlight-color: rgba(0,0,0,0);/*リンクの領域表示を無効化*/
+    overflow: hidden;
+}
+
+#news_list .news .info_date {
+    color: #828282;
+}
+
+#news_list ul {
+    margin: 1.3vw 1.3vw 0;
+    padding: 0;
+    width: 97.4vw;
+}
+
+#news_list li {
+    list-style: none;
+}
+
+#news_list hr, #detail hr {
+    background-image: url("../0_common_images/news_img_line.png");
+    background-repeat: repeat-x;
+    background-size: contain;
+    height: 0.26vw;
+    border: 0;
+    margin-top: 0.8vw;
+    margin-bottom: 0.8vw;
+}
+
+#news_list hr.hr_detail {
+    margin-top: 1.1vw;
+    margin-bottom: 1.1vw;
+
+}
+
+#news_list .list_area {
+    overflow: hidden;
+}
+
+#news_list .information {
+    float: left;
+    margin-left: 2.0vw;
+    width: 70.5vw;
+}
+
+#news_list .info_type_image {
+    float: left;
+    margin-top: 0.8vw;
+    width: 13.7vw;
+}
+
+#news_list .info_date {
+    float: left;
+    margin-top: 1.0vw;
+    margin-left: 2.0vw;
+}
+
+#news_list .info_new_image {
+    float: right;
+    margin-top: 0.7vw;
+    width: 8.3vw;
+}
+
+#news_list .arrow_image {
+    float: left;
+    width: 3.2vw;
+    height: 8.3vw;
+}
+
+#page_area {
+    margin-top: 3%;
+    padding: 0 2.0vw 4.0vw 2.0vw;
+    width: 100%;
+    overflow: auto;
+    font-size: 1.2vw;
+
+    display: none;
+}
+
+#paging {
+    text-align: center;
+}
+
+#page_area .page {
+    font-size: 1.8vw;
+    font-weight: bold;
+    padding-left: 1.5vw;
+    padding-right: 1.5vw;
+    color: #191919;
+    text-decoration: none;
+}
+
+#page_area .page.new {
+    color: #c12424;
+}
+
+#page_area .page.off {
+    color: #aaaaaa;
+}
+
+/*+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+詳細ページ設定
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*/
+#detail {
+    width: 100%;
+    height: 100%;
+}
+
+#detail .detail_text {
+    width : 97.4vw;
+    height : auto;
+    vertical-align:middle;
+    padding: 0;
+    margin: 0vw 1.3vw 1.3vw;
+}
+
+#detail .detail_image {
+    width: 100%;
+    padding: 1.0vw;
+    text-align: center;
+
+    display: none;
+}
+
+#detail .detail_image img {
+    width: 45.0vw;
+    height: auto;
+}
+
+.detail_text img {
+    max-width: 100%;
+}
+
+/*+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+外部コンテンツページ設定
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+*/
+#contents {
+    width: 100%;
+    height: 100%;
+    overflow: hidden;
+}
+
+#contents #banner_list {
+    position: relative;
+    left: 3vw;
+}
+
+#contents .banner {
+    float: left;
+    padding: 0.6vw;
+}
+
+#contents .banner:nth-child(3n+4) {
+    clear: both;
+}
+
+#contents .clear {
+    clear: both;
+}
+
+#contents img {
+    width: 30.0vw;
+    height: auto;
+}

web_assets/announcement/sanitize.css

@@ -0,0 +1,550 @@
+/*! sanitize.css v4.0.0 | CC0 License | github.com/10up/sanitize.css */
+
+/* Display definitions
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 9-.
+ * 1. Add the correct display in Edge, IE, and Firefox.
+ * 2. Add the correct display in IE.
+ */
+
+article,
+aside,
+details, /* 1 */
+figcaption,
+figure,
+footer,
+header,
+main, /* 2 */
+menu,
+nav,
+section,
+summary { /* 1 */
+	display: block;
+}
+
+/**
+ * Add the correct display in IE 9-.
+ */
+
+audio,
+canvas,
+progress,
+video {
+	display: inline-block;
+}
+
+/**
+ * Add the correct display in iOS 4-7.
+ */
+
+audio:not([controls]) {
+	display: none;
+	height: 0;
+}
+
+/**
+ * Add the correct display in IE 10-.
+ * 1. Add the correct display in IE.
+ */
+
+template, /* 1 */
+[hidden] {
+	display: none;
+}
+
+/* Elements of HTML (https://www.w3.org/TR/html5/semantics.html)
+   ========================================================================== */
+
+/**
+ * 1. Remove repeating backgrounds in all browsers (opinionated).
+ * 2. Add box sizing inheritence in all browsers (opinionated).
+ */
+
+*,
+::before,
+::after {
+	background-repeat: no-repeat; /* 1 */
+	box-sizing: inherit; /* 2 */
+}
+
+/**
+ * 1. Add text decoration inheritance in all browsers (opinionated).
+ * 2. Add vertical alignment inheritence in all browsers (opinionated).
+ */
+
+::before,
+::after {
+	text-decoration: inherit; /* 1 */
+	vertical-align: inherit; /* 2 */
+}
+
+/**
+ * 1. Add border box sizing in all browsers (opinionated).
+ * 2. Add the default cursor in all browsers (opinionated).
+ * 3. Add a flattened line height in all browsers (opinionated).
+ * 4. Prevent font size adjustments after orientation changes in IE and iOS.
+ */
+
+html {
+	box-sizing: border-box; /* 1 */
+	cursor: default; /* 2 */
+	font-family: sans-serif; /* 3 */
+	line-height: 1.5; /* 3 */
+	-ms-text-size-adjust: 100%; /* 4 */
+	-webkit-text-size-adjust: 100%; /* 5 */
+}
+
+/* Sections (https://www.w3.org/TR/html5/sections.html)
+   ========================================================================== */
+
+/**
+ * Remove the margin in all browsers (opinionated).
+ */
+
+body {
+	margin: 0;
+}
+
+/**
+ * Correct the font sizes and margins on `h1` elements within
+ * `section` and `article` contexts in Chrome, Firefox, and Safari.
+ */
+
+h1 {
+	font-size: 2em;
+	margin: .67em 0;
+}
+
+/* Grouping content (https://www.w3.org/TR/html5/grouping-content.html)
+   ========================================================================== */
+
+/**
+ * 1. Correct font sizing inheritance and scaling in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+code,
+kbd,
+pre,
+samp {
+	font-family: monospace, monospace; /* 1 */
+	font-size: 1em; /* 2 */
+}
+
+/**
+ * 1. Correct the height in Firefox.
+ * 2. Add visible overflow in Edge and IE.
+ */
+
+hr {
+	height: 0; /* 1 */
+	overflow: visible; /* 2 */
+}
+
+/**
+ * Remove the list style on navigation lists in all browsers (opinionated).
+ */
+
+nav ol,
+nav ul {
+	list-style: none;
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * 1. Add a bordered underline effect in all browsers.
+ * 2. Remove text decoration in Firefox 40+.
+ */
+
+abbr[title] {
+	border-bottom: 1px dotted; /* 1 */
+	text-decoration: none; /* 2 */
+}
+
+/**
+ * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
+ */
+
+b,
+strong {
+	font-weight: inherit;
+}
+
+/**
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+	font-weight: bolder;
+}
+
+/**
+ * Add the correct font style in Android 4.3-.
+ */
+
+dfn {
+	font-style: italic;
+}
+
+/**
+ * Add the correct colors in IE 9-.
+ */
+
+mark {
+	background-color: #ffff00;
+	color: #000000;
+}
+
+/**
+ * Add the correct vertical alignment in Chrome, Firefox, and Opera.
+ */
+
+progress {
+	vertical-align: baseline;
+}
+
+/**
+ * Correct the font size in all browsers.
+ */
+
+small {
+	font-size: 83.3333%;
+}
+
+/**
+ * Change the positioning on superscript and subscript elements
+ * in all browsers (opinionated).
+ * 1. Correct the font size in all browsers.
+ */
+
+sub,
+sup {
+	font-size: 83.3333%; /* 1 */
+	line-height: 0;
+	position: relative;
+	vertical-align: baseline;
+}
+
+sub {
+	bottom: -.25em;
+}
+
+sup {
+	top: -.5em;
+}
+
+/*
+ * Remove the text shadow on text selections (opinionated).
+ * 1. Restore the coloring undone by defining the text shadow (opinionated).
+ */
+
+::-moz-selection {
+	background-color: #b3d4fc; /* 1 */
+	color: #000000; /* 1 */
+	text-shadow: none;
+}
+
+::selection {
+	background-color: #b3d4fc; /* 1 */
+	color: #000000; /* 1 */
+	text-shadow: none;
+}
+
+/* Embedded content (https://www.w3.org/TR/html5/embedded-content-0.html)
+   ========================================================================== */
+
+/*
+ * Change the alignment on media elements in all browers (opinionated).
+ */
+
+audio,
+canvas,
+iframe,
+img,
+svg,
+video {
+	vertical-align: middle;
+}
+
+/**
+ * Remove the border on images inside links in IE 10-.
+ */
+
+img {
+	border-style: none;
+}
+
+/**
+ * Change the fill color to match the text color in all browsers (opinionated).
+ */
+
+svg {
+	fill: currentColor;
+}
+
+/**
+ * Hide the overflow in IE.
+ */
+
+svg:not(:root) {
+	overflow: hidden;
+}
+
+/* Links (https://www.w3.org/TR/html5/links.html#links)
+   ========================================================================== */
+
+/**
+ * 1. Remove the gray background on active links in IE 10.
+ * 2. Remove the gaps in underlines in iOS 8+ and Safari 8+.
+ */
+
+a {
+	background-color: transparent; /* 1 */
+	-webkit-text-decoration-skip: objects; /* 2 */
+}
+
+/**
+ * Remove the outline when hovering in all browsers (opinionated.
+ */
+
+:hover {
+	outline-width: 0;
+}
+
+/* Tabular data (https://www.w3.org/TR/html5/tabular-data.html)
+   ========================================================================== */
+
+/*
+ * Remove border spacing in all browsers (opinionated).
+ */
+
+table {
+	border-collapse: collapse;
+	border-spacing: 0;
+}
+
+/* transform-style:  (https://www.w3.org/TR/html5/forms.html)
+   ========================================================================== */
+
+/**
+ * 1. Remove the default styling in all browsers (opinionated).
+ * 3. Remove the margin in Firefox and Safari.
+ */
+
+/* button, */
+input,
+select
+/* textarea */
+{
+	background-color: transparent; /* 1 */
+	border-style: none; /* 1 */
+	color: inherit; /* 1 */
+	font-size: 1em; /* 1 */
+	margin: 0; /* 3 */
+}
+
+/**
+ * Correct the overflow in IE.
+ * 1. Correct the overflow in Edge.
+ */
+
+button,
+input { /* 1 */
+	overflow: visible;
+}
+
+/**
+ * Remove the inheritance in Edge, Firefox, and IE.
+ * 1. Remove the inheritance in Firefox.
+ */
+
+button,
+select { /* 1 */
+	text-transform: none;
+}
+
+/**
+ * 1. Prevent the WebKit bug where (2) destroys native `audio` and `video`
+ *    controls in Android 4.
+ * 2. Correct the inability to style clickable types in iOS and Safari.
+ */
+
+button,
+html [type="button"], /* 1 */
+[type="reset"],
+[type="submit"] {
+	-webkit-appearance: button; /* 2 */
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
+ */
+
+::-moz-focus-inner {
+	border-style: none;
+	padding: 0;
+}
+
+/**
+ * Correct the focus styles unset by the previous rule.
+ */
+
+:-moz-focusring {
+	outline: 1px dotted ButtonText;
+}
+
+/**
+ * Correct the border, margin, and padding in all browsers.
+ */
+
+fieldset {
+	border: 1px solid #c0c0c0;
+	margin: 0 2px;
+	padding: .35em .625em .75em;
+}
+
+/**
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
+ */
+
+legend {
+	display: table; /* 1 */
+	max-width: 100%; /* 1 */
+	padding: 0; /* 2 */
+	white-space: normal; /* 1 */
+}
+
+/**
+ * 1. Remove the vertical scrollbar in IE.
+ * 2. Change the resize direction on textareas in all browsers (opinionated).
+ */
+
+textarea {
+	overflow: auto; /* 1 */
+	resize: vertical; /* 2 */
+}
+
+/**
+ * Remove the padding in IE 10-.
+ */
+
+[type="checkbox"],
+[type="radio"] {
+	padding: 0;
+}
+
+/**
+ * Correct the cursor style on increment and decrement buttons in Chrome.
+ */
+
+::-webkit-inner-spin-button,
+::-webkit-outer-spin-button {
+	height: auto;
+}
+
+/**
+ * 1. Correct the odd appearance in Chrome and Safari.
+ * 2. Correct the outline style in Safari.
+ */
+
+[type="search"] {
+	-webkit-appearance: textfield; /* 1 */
+	outline-offset: -2px; /* 2 */
+}
+
+/**
+ * Remove the inner padding and cancel buttons in Chrome and Safari for OS X.
+ */
+
+::-webkit-search-cancel-button,
+::-webkit-search-decoration {
+	-webkit-appearance: none;
+}
+
+/**
+ * Correct the text style on placeholders in Chrome, Edge, and Safari.
+ */
+
+::-webkit-input-placeholder {
+	color: inherit;
+	opacity: .54;
+}
+
+/**
+ * 1. Correct the inability to style clickable types in iOS and Safari.
+ * 2. Change font properties to `inherit` in Safari.
+ */
+
+::-webkit-file-upload-button {
+	-webkit-appearance: button; /* 1 */
+	font: inherit; /* 2 */
+}
+
+/* WAI-ARIA (https://www.w3.org/TR/html5/dom.html#wai-aria)
+   ========================================================================== */
+
+/**
+ * Change the cursor on busy elements (opinionated).
+ */
+
+[aria-busy="true"] {
+	cursor: progress;
+}
+
+/*
+ * Change the cursor on control elements (opinionated).
+ */
+
+[aria-controls] {
+	cursor: pointer;
+}
+
+/*
+ * Change the cursor on disabled, not-editable, or otherwise
+ * inoperable elements (opinionated).
+ */
+
+[aria-disabled] {
+	cursor: default;
+}
+
+/* User interaction (https://www.w3.org/TR/html5/editing.html)
+   ========================================================================== */
+
+/*
+ * Remove the tapping delay on clickable elements (opinionated).
+ * 1. Remove the tapping delay in IE 10.
+ */
+
+a,
+area,
+button,
+input,
+label,
+select,
+textarea,
+[tabindex] {
+	-ms-touch-action: manipulation; /* 1 */
+	touch-action: manipulation;
+}
+
+/*
+ * Change the display on visually hidden accessible elements (opinionated).
+ */
+
+[hidden][aria-hidden="false"] {
+	clip: rect(0, 0, 0, 0);
+	display: inherit;
+	position: absolute;
+}
+
+[hidden][aria-hidden="false"]:focus {
+	clip: auto;
+}