feat: add master password hint functionality

- Updated user model to include masterPasswordHint.
- Modified sync handler to return masterPasswordHint.
- Implemented password hint retrieval in public API.
- Enhanced user profile management to allow updating of password hint.
- Added UI components for displaying and editing password hint.
- Updated localization files for new password hint strings.
- Improved rate limiting for sensitive public requests.
- Adjusted database schema to accommodate master password hint.

src/services/backup-archive.ts

@@ -370,7 +370,7 @@ export async function buildBackupArchive(env: Env, date: Date = new Date()): Pro
   const encoder = new TextEncoder();
   const [configRows, userRows, revisionRows, folderRows, cipherRows, attachmentRows, sendRows] = await Promise.all([
     queryRows(env.DB, 'SELECT key, value FROM config ORDER BY key ASC'),
-    queryRows(env.DB, 'SELECT id, email, name, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at FROM users ORDER BY created_at ASC'),
+    queryRows(env.DB, 'SELECT id, email, name, master_password_hint, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at FROM users ORDER BY created_at ASC'),
     queryRows(env.DB, 'SELECT user_id, revision_date FROM user_revisions ORDER BY user_id ASC'),
     queryRows(env.DB, 'SELECT id, user_id, name, created_at, updated_at FROM folders ORDER BY created_at ASC'),
     queryRows(env.DB, 'SELECT id, user_id, type, folder_id, name, notes, favorite, data, reprompt, key, created_at, updated_at, deleted_at FROM ciphers ORDER BY created_at ASC'),

src/services/backup-import.ts

@@ -270,7 +270,7 @@ async function importBackupRows(db: D1Database, payload: BackupPayload['db']): P
     ...buildInsertStatements(
       db,
       'users',
-      ['id', 'email', 'name', 'master_password_hash', 'key', 'private_key', 'public_key', 'kdf_type', 'kdf_iterations', 'kdf_memory', 'kdf_parallelism', 'security_stamp', 'role', 'status', 'totp_secret', 'totp_recovery_code', 'created_at', 'updated_at'],
+      ['id', 'email', 'name', 'master_password_hint', 'master_password_hash', 'key', 'private_key', 'public_key', 'kdf_type', 'kdf_iterations', 'kdf_memory', 'kdf_parallelism', 'security_stamp', 'role', 'status', 'totp_secret', 'totp_recovery_code', 'created_at', 'updated_at'],
       payload.users || []
     ),
     ...buildInsertStatements(db, 'user_revisions', ['user_id', 'revision_date'], payload.user_revisions || [], true),

src/services/ratelimit.ts

@@ -184,6 +184,14 @@ export class RateLimitService {
   ): Promise<{ allowed: boolean; remaining: number; retryAfterSeconds?: number }> {
     return this.consumeFixedWindowBudget(identifier, maxRequests, CONFIG.API_WINDOW_SECONDS);
   }
+
+  async consumeBudgetWithWindow(
+    identifier: string,
+    maxRequests: number,
+    windowSeconds: number
+  ): Promise<{ allowed: boolean; remaining: number; retryAfterSeconds?: number }> {
+    return this.consumeFixedWindowBudget(identifier, maxRequests, windowSeconds);
+  }
 }
 
 function parseIpv4Octets(input: string): number[] | null {

src/services/storage-schema.ts

@@ -3,10 +3,11 @@
 // Any new table/column/index must be added to both places together.
 const SCHEMA_STATEMENTS: readonly string[] = [
   'CREATE TABLE IF NOT EXISTS users (' +
-  'id TEXT PRIMARY KEY, email TEXT NOT NULL UNIQUE, name TEXT, master_password_hash TEXT NOT NULL, ' +
+  'id TEXT PRIMARY KEY, email TEXT NOT NULL UNIQUE, name TEXT, master_password_hint TEXT, master_password_hash TEXT NOT NULL, ' +
   'key TEXT NOT NULL, private_key TEXT, public_key TEXT, kdf_type INTEGER NOT NULL, ' +
   'kdf_iterations INTEGER NOT NULL, kdf_memory INTEGER, kdf_parallelism INTEGER, ' +
   'security_stamp TEXT NOT NULL, role TEXT NOT NULL DEFAULT \'user\', status TEXT NOT NULL DEFAULT \'active\', totp_secret TEXT, totp_recovery_code TEXT, created_at TEXT NOT NULL, updated_at TEXT NOT NULL)',
+  'ALTER TABLE users ADD COLUMN master_password_hint TEXT',
   'ALTER TABLE users ADD COLUMN role TEXT NOT NULL DEFAULT \'user\'',
   'ALTER TABLE users ADD COLUMN status TEXT NOT NULL DEFAULT \'active\'',
   'ALTER TABLE users ADD COLUMN totp_secret TEXT',

src/services/storage-user-repo.ts

@@ -7,6 +7,7 @@ function mapUserRow(row: any): User {
     id: row.id,
     email: row.email,
     name: row.name,
+    masterPasswordHint: row.master_password_hint ?? null,
     masterPasswordHash: row.master_password_hash,
     key: row.key,
     privateKey: row.private_key,
@@ -28,7 +29,7 @@ function mapUserRow(row: any): User {
 export async function getUser(db: D1Database, email: string): Promise<User | null> {
   const row = await db
     .prepare(
-      'SELECT id, email, name, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at FROM users WHERE email = ?'
+      'SELECT id, email, name, master_password_hint, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at FROM users WHERE email = ?'
     )
     .bind(email.toLowerCase())
     .first<any>();
@@ -39,7 +40,7 @@ export async function getUser(db: D1Database, email: string): Promise<User | nul
 export async function getUserById(db: D1Database, id: string): Promise<User | null> {
   const row = await db
     .prepare(
-      'SELECT id, email, name, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at FROM users WHERE id = ?'
+      'SELECT id, email, name, master_password_hint, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at FROM users WHERE id = ?'
     )
     .bind(id)
     .first<any>();
@@ -55,7 +56,7 @@ export async function getUserCount(db: D1Database): Promise<number> {
 export async function getAllUsers(db: D1Database): Promise<User[]> {
   const res = await db
     .prepare(
-      'SELECT id, email, name, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at FROM users ORDER BY created_at ASC'
+      'SELECT id, email, name, master_password_hint, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at FROM users ORDER BY created_at ASC'
     )
     .all<any>();
   return (res.results || []).map((row) => mapUserRow(row));
@@ -64,10 +65,10 @@ export async function getAllUsers(db: D1Database): Promise<User[]> {
 export async function saveUser(db: D1Database, safeBind: SafeBind, user: User): Promise<void> {
   const email = user.email.toLowerCase();
   const stmt = db.prepare(
-    'INSERT INTO users(id, email, name, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at) ' +
-    'VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ' +
+    'INSERT INTO users(id, email, name, master_password_hint, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at) ' +
+    'VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ' +
     'ON CONFLICT(id) DO UPDATE SET ' +
-    'email=excluded.email, name=excluded.name, master_password_hash=excluded.master_password_hash, key=excluded.key, private_key=excluded.private_key, public_key=excluded.public_key, ' +
+    'email=excluded.email, name=excluded.name, master_password_hint=excluded.master_password_hint, master_password_hash=excluded.master_password_hash, key=excluded.key, private_key=excluded.private_key, public_key=excluded.public_key, ' +
     'kdf_type=excluded.kdf_type, kdf_iterations=excluded.kdf_iterations, kdf_memory=excluded.kdf_memory, kdf_parallelism=excluded.kdf_parallelism, security_stamp=excluded.security_stamp, role=excluded.role, status=excluded.status, totp_secret=excluded.totp_secret, totp_recovery_code=excluded.totp_recovery_code, updated_at=excluded.updated_at'
   );
   await safeBind(
@@ -75,6 +76,7 @@ export async function saveUser(db: D1Database, safeBind: SafeBind, user: User):
     user.id,
     email,
     user.name,
+    user.masterPasswordHint,
     user.masterPasswordHash,
     user.key,
     user.privateKey,
@@ -100,8 +102,8 @@ export async function createUser(db: D1Database, safeBind: SafeBind, user: User)
 export async function createFirstUser(db: D1Database, safeBind: SafeBind, user: User): Promise<boolean> {
   const email = user.email.toLowerCase();
   const stmt = db.prepare(
-    'INSERT INTO users(id, email, name, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at) ' +
-    'SELECT ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? ' +
+    'INSERT INTO users(id, email, name, master_password_hint, master_password_hash, key, private_key, public_key, kdf_type, kdf_iterations, kdf_memory, kdf_parallelism, security_stamp, role, status, totp_secret, totp_recovery_code, created_at, updated_at) ' +
+    'SELECT ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? ' +
     'WHERE NOT EXISTS (SELECT 1 FROM users LIMIT 1)'
   );
   const result = await safeBind(
@@ -109,6 +111,7 @@ export async function createFirstUser(db: D1Database, safeBind: SafeBind, user:
     user.id,
     email,
     user.name,
+    user.masterPasswordHint,
     user.masterPasswordHash,
     user.key,
     user.privateKey,

src/services/storage.ts

@@ -102,7 +102,7 @@ import {
 
 const TWO_FACTOR_REMEMBER_TTL_MS = 30 * 24 * 60 * 60 * 1000;
 const STORAGE_SCHEMA_VERSION_KEY = 'schema.version';
-const STORAGE_SCHEMA_VERSION = '2026-03-18.1';
+const STORAGE_SCHEMA_VERSION = '2026-03-19.1';
 
 // D1-backed storage.
 // Contract: