feat(users): guest role + reserved guest principal, excluded from count/list

src/data/users.test.ts

@@ -1,6 +1,6 @@
 import { describe, it, expect, beforeEach, afterEach } from "vitest";
 import { createDatabase, type BotDatabase } from "./database.js";
-import { createUserStore, UsernameTakenError, type UserStore } from "./users.js";
+import { createUserStore, UsernameTakenError, GUEST_USER_ID, GUEST_USERNAME, type UserStore } from "./users.js";
 
 describe("UserStore", () => {
   let botDb: BotDatabase;
@@ -184,3 +184,28 @@ describe("UserStore", () => {
     expect(users.countAdmins()).toBe(1);
   });
 });
+
+describe("guest row exclusion", () => {
+  let botDb: BotDatabase;
+  let users: UserStore;
+
+  beforeEach(() => {
+    botDb = createDatabase(":memory:");
+    users = createUserStore(botDb.db);
+  });
+
+  afterEach(() => {
+    botDb.close();
+  });
+
+  it("countUsers and listUsers ignore the reserved guest row", async () => {
+    await users.createUser("alice", "password123", "member");
+    // Insert the reserved guest row directly (mirrors the migration).
+    botDb.db.prepare(
+      "INSERT INTO users (id, username, passwordHash, createdAt, updatedAt, role) VALUES (?, ?, ?, ?, ?, 'guest')"
+    ).run(GUEST_USER_ID, GUEST_USERNAME, "!", Date.now(), Date.now());
+
+    expect(users.countUsers()).toBe(1); // alice only
+    expect(users.listUsers().some((u) => u.id === GUEST_USER_ID)).toBe(false);
+  });
+});

src/data/users.ts

@@ -4,7 +4,13 @@ import bcrypt from "bcryptjs";
 
 const BCRYPT_ROUNDS = 12;
 
-export type UserRole = "admin" | "member";
+export type UserRole = "admin" | "member" | "guest";
+
+/** Reserved synthetic principal for login-less guest sessions. The username is
+ *  non-ASCII so it can never collide with an API-created account (which is
+ *  validated against ^[A-Za-z0-9_\-.]{3,32}$). */
+export const GUEST_USER_ID = "__guest__";
+export const GUEST_USERNAME = "游客";
 
 export interface UserRow {
   id: string;
@@ -39,7 +45,7 @@ export class UsernameTakenError extends Error {
 }
 
 export function createUserStore(db: Database.Database): UserStore {
-  const countStmt = db.prepare("SELECT COUNT(*) AS n FROM users");
+  const countStmt = db.prepare("SELECT COUNT(*) AS n FROM users WHERE role != 'guest'");
   const countAdminsStmt = db.prepare("SELECT COUNT(*) AS n FROM users WHERE role = 'admin'");
   const insertStmt = db.prepare(
     "INSERT INTO users (id, username, passwordHash, createdAt, updatedAt, role) VALUES (?, ?, ?, ?, ?, ?)"
@@ -57,7 +63,7 @@ export function createUserStore(db: Database.Database): UserStore {
     "UPDATE users SET role = ?, updatedAt = ? WHERE id = ?"
   );
   const listUsersStmt = db.prepare(
-    "SELECT id, username, createdAt, role FROM users ORDER BY createdAt ASC"
+    "SELECT id, username, createdAt, role FROM users WHERE role != 'guest' ORDER BY createdAt ASC"
   );
   const deleteUserStmt = db.prepare("DELETE FROM users WHERE id = ?");