diff --git a/apps/lib/app/app.dart b/apps/lib/app/app.dart
index e53e215..2b90cf3 100644
--- a/apps/lib/app/app.dart
+++ b/apps/lib/app/app.dart
@@ -305,6 +305,21 @@ class _EryaoAppState extends State<EryaoApp> {
     return saved;
   }
 
+  Future<void> _deleteAccount() async {
+    await _profileApi.deleteAccount();
+    if (!mounted) {
+      return;
+    }
+    setState(() {
+      _profileSettings = ProfileSettingsV1.defaultsForLocale(_locale);
+      _historyRecords = const <DivinationResultData>[];
+      _creditsBalance = 0;
+      _loadedProfileUserEmail = null;
+      _loadedHistoryUserEmail = null;
+      _loadedCreditsUserEmail = null;
+    });
+  }
+
   Future<void> _saveProfileSettings(ProfileSettingsV1 next) async {
     try {
       final oldLanguage = _profileSettings.preferences.interfaceLanguage;
@@ -415,6 +430,7 @@ class _EryaoAppState extends State<EryaoApp> {
         onDivinationCompleted: _handleDivinationCompleted,
         onDeleteHistorySession: _handleHistorySessionDeleted,
         onLogout: _authBloc.logout,
+        onDeleteAccount: _deleteAccount,
       );
     }
 
diff --git a/apps/lib/core/network/api_problem_mapper.dart b/apps/lib/core/network/api_problem_mapper.dart
index 2297ae5..6224c0e 100644
--- a/apps/lib/core/network/api_problem_mapper.dart
+++ b/apps/lib/core/network/api_problem_mapper.dart
@@ -29,6 +29,8 @@ String mapApiProblemToMessage(ApiProblem problem, AppLocalizations l10n) {
       return l10n.errorAudioEmpty;
     case 'AGENT_ASR_UNAVAILABLE':
       return l10n.errorAsrUnavailable;
+    case 'PROFILE_DELETE_FAILED':
+      return l10n.errorProfileDeleteFailed;
     default:
       break;
   }
diff --git a/apps/lib/data/network/api_client.dart b/apps/lib/data/network/api_client.dart
index e3b8e6b..c90f7f4 100644
--- a/apps/lib/data/network/api_client.dart
+++ b/apps/lib/data/network/api_client.dart
@@ -31,7 +31,13 @@ class ApiClient {
             final authHeader =
                 error.requestOptions.headers['Authorization'] as String?;
             final hasAuthHeader = authHeader != null && authHeader.isNotEmpty;
-            if (status == 401 && hasAuthHeader && onUnauthorized != null) {
+            final isLogoutEndpoint =
+                error.requestOptions.method.toUpperCase() == 'DELETE' &&
+                error.requestOptions.path == '/api/v1/auth/sessions';
+            if (status == 401 &&
+                hasAuthHeader &&
+                onUnauthorized != null &&
+                !isLogoutEndpoint) {
               await onUnauthorized();
             }
             handler.next(error);
diff --git a/apps/lib/features/auth/data/apis/auth_api.dart b/apps/lib/features/auth/data/apis/auth_api.dart
index 769a86d..4647c2b 100644
--- a/apps/lib/features/auth/data/apis/auth_api.dart
+++ b/apps/lib/features/auth/data/apis/auth_api.dart
@@ -1,3 +1,6 @@
+import 'package:dio/dio.dart';
+
+import '../../../../core/network/api_problem.dart';
 import '../../../../data/network/api_client.dart';
 import '../models/session_response.dart';
 
@@ -25,9 +28,32 @@ class AuthApi {
   }
 
   Future<void> deleteSession({required String refreshToken}) async {
-    await _apiClient.deleteNoContent(
+    final response = await _apiClient.rawDio.delete<Map<String, dynamic>>(
       '/api/v1/auth/sessions',
       data: {'refresh_token': refreshToken},
+      options: Options(
+        validateStatus: (status) => status != null && status < 500,
+      ),
+    );
+    final status = response.statusCode ?? 500;
+    if (status == 204 || status == 401) {
+      return;
+    }
+
+    final data = response.data;
+    if (data is Map<String, dynamic>) {
+      throw ApiProblem(
+        status: status,
+        title: (data['title'] as String?) ?? 'Request failed',
+        detail: (data['detail'] as String?) ?? '',
+        code: data['code'] as String?,
+      );
+    }
+
+    throw ApiProblem(
+      status: status,
+      title: 'Request failed',
+      detail: 'Failed to delete session',
     );
   }
 
diff --git a/apps/lib/features/auth/data/repositories/auth_repository.dart b/apps/lib/features/auth/data/repositories/auth_repository.dart
index e3bd39a..5e4141b 100644
--- a/apps/lib/features/auth/data/repositories/auth_repository.dart
+++ b/apps/lib/features/auth/data/repositories/auth_repository.dart
@@ -1,4 +1,5 @@
 import '../../../../core/auth/session_store.dart';
+import '../../../../core/network/api_problem.dart';
 import '../apis/auth_api.dart';
 import '../models/auth_user.dart';
 
@@ -70,7 +71,14 @@ class AuthRepositoryImpl implements AuthRepository {
     try {
       final refreshToken = await _sessionStore.getRefreshToken();
       if (refreshToken != null && refreshToken.isNotEmpty) {
-        await _authApi.deleteSession(refreshToken: refreshToken);
+        try {
+          await _authApi.deleteSession(refreshToken: refreshToken);
+        } on ApiProblem catch (problem) {
+          if (problem.status != 401 ||
+              problem.code != 'AUTH_REFRESH_TOKEN_INVALID') {
+            rethrow;
+          }
+        }
       }
     } finally {
       await clearLocalSession();
diff --git a/apps/lib/features/auth/presentation/bloc/auth_bloc.dart b/apps/lib/features/auth/presentation/bloc/auth_bloc.dart
index 0440077..86a0715 100644
--- a/apps/lib/features/auth/presentation/bloc/auth_bloc.dart
+++ b/apps/lib/features/auth/presentation/bloc/auth_bloc.dart
@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/foundation.dart';
 
 import '../../../../core/logging/logger.dart';
@@ -56,18 +58,19 @@ class AuthBloc extends ChangeNotifier {
   }
 
   Future<void> logout() async {
-    try {
-      await _repository.logout();
-    } catch (error, stackTrace) {
-      _logger.error(
-        message: 'User logout failed: ${error.runtimeType}',
-        error: error.runtimeType.toString(),
-        stackTrace: stackTrace,
-      );
-    }
     _logger.info(message: 'User logged out');
     _state = const AuthState(status: AuthStatus.unauthenticated);
     notifyListeners();
+
+    unawaited(
+      _repository.logout().catchError((Object error, StackTrace stackTrace) {
+        _logger.error(
+          message: 'User logout failed: ${error.runtimeType}',
+          error: error.runtimeType.toString(),
+          stackTrace: stackTrace,
+        );
+      }),
+    );
   }
 
   Future<void> handleUnauthorized401() async {
diff --git a/apps/lib/features/home/presentation/screens/home_screen.dart b/apps/lib/features/home/presentation/screens/home_screen.dart
index a69b08d..410dc4d 100644
--- a/apps/lib/features/home/presentation/screens/home_screen.dart
+++ b/apps/lib/features/home/presentation/screens/home_screen.dart
@@ -35,6 +35,7 @@ class HomeScreen extends StatefulWidget {
     required this.onDivinationCompleted,
     required this.onDeleteHistorySession,
     required this.onLogout,
+    required this.onDeleteAccount,
   });
 
   final String account;
@@ -54,6 +55,7 @@ class HomeScreen extends StatefulWidget {
   onDivinationCompleted;
   final Future<void> Function(String threadId) onDeleteHistorySession;
   final Future<void> Function() onLogout;
+  final Future<void> Function() onDeleteAccount;
 
   @override
   State<HomeScreen> createState() => _HomeScreenState();
@@ -116,6 +118,7 @@ class _HomeScreenState extends State<HomeScreen> {
             onSaveProfile: widget.onSaveProfile,
             onUploadAvatar: widget.onUploadAvatar,
             onLogout: widget.onLogout,
+            onDeleteAccount: widget.onDeleteAccount,
           ),
         ],
       ),
@@ -505,6 +508,7 @@ class _ProfileTab extends StatelessWidget {
     required this.onSaveProfile,
     required this.onUploadAvatar,
     required this.onLogout,
+    required this.onDeleteAccount,
   });
 
   final String account;
@@ -516,6 +520,7 @@ class _ProfileTab extends StatelessWidget {
   onSaveProfile;
   final Future<ProfileSettingsV1> Function(String filePath) onUploadAvatar;
   final Future<void> Function() onLogout;
+  final Future<void> Function() onDeleteAccount;
 
   @override
   Widget build(BuildContext context) {
@@ -528,6 +533,7 @@ class _ProfileTab extends StatelessWidget {
       onSaveProfile: onSaveProfile,
       onUploadAvatar: onUploadAvatar,
       onLogout: onLogout,
+      onDeleteAccount: onDeleteAccount,
     );
   }
 }
diff --git a/apps/lib/features/settings/data/apis/profile_api.dart b/apps/lib/features/settings/data/apis/profile_api.dart
index 0d2de44..6a8a9c6 100644
--- a/apps/lib/features/settings/data/apis/profile_api.dart
+++ b/apps/lib/features/settings/data/apis/profile_api.dart
@@ -87,6 +87,10 @@ class ProfileApi {
     return _toSettings(data);
   }
 
+  Future<void> deleteAccount() async {
+    await _apiClient.deleteNoContent('/api/v1/users/me');
+  }
+
   ProfileSettingsV1 _toSettings(Map<String, dynamic> json) {
     final settingsRaw = json['settings'];
     final preferencesRaw = settingsRaw is Map<String, dynamic>
diff --git a/apps/lib/features/settings/presentation/screens/account_delete_screen.dart b/apps/lib/features/settings/presentation/screens/account_delete_screen.dart
new file mode 100644
index 0000000..b822412
--- /dev/null
+++ b/apps/lib/features/settings/presentation/screens/account_delete_screen.dart
@@ -0,0 +1,268 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+import '../../../../core/logging/logger.dart';
+import '../../../../core/network/api_problem.dart';
+import '../../../../core/network/api_problem_mapper.dart';
+import '../../../../l10n/app_localizations.dart';
+import '../../../../shared/theme/design_tokens.dart';
+import '../../../../shared/widgets/toast/toast.dart';
+import '../../../../shared/widgets/toast/toast_type.dart';
+import '../widgets/settings_section_widgets.dart';
+
+class AccountDeleteScreen extends StatefulWidget {
+  const AccountDeleteScreen({super.key, required this.onDeleteAccount});
+
+  final Future<void> Function() onDeleteAccount;
+
+  @override
+  State<AccountDeleteScreen> createState() => _AccountDeleteScreenState();
+}
+
+class _AccountDeleteScreenState extends State<AccountDeleteScreen> {
+  final Logger _logger = getLogger('features.settings.account_delete');
+  bool _isDeleting = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+    final colors = Theme.of(context).colorScheme;
+
+    return Scaffold(
+      backgroundColor: colors.surfaceContainerLow,
+      appBar: AppBar(
+        title: Text(l10n.settingsAccountAndDataTitle),
+        centerTitle: true,
+        backgroundColor: colors.surfaceContainerLow,
+        surfaceTintColor: colors.surfaceContainerLow,
+      ),
+      body: ListView(
+        padding: const EdgeInsets.all(AppSpacing.lg),
+        children: [
+          SettingsGroupCard(
+            children: [
+              SettingsMenuTile(
+                icon: Icons.delete_outline_rounded,
+                title: l10n.settingsDeleteAccountTitle,
+                tint: colors.error,
+                background: colors.surfaceContainerHighest,
+                titleColor: colors.error,
+                showDivider: false,
+                onTap: _isDeleting ? () {} : _confirmDelete,
+              ),
+            ],
+          ),
+        ],
+      ),
+    );
+  }
+
+  Future<void> _confirmDelete() async {
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (dialogContext) {
+        return const _DeleteConfirmDialog();
+      },
+    );
+    if (confirmed != true || !mounted) {
+      return;
+    }
+    await _deleteAccount();
+  }
+
+  Future<void> _deleteAccount() async {
+    if (_isDeleting) {
+      return;
+    }
+    setState(() {
+      _isDeleting = true;
+    });
+    try {
+      await widget.onDeleteAccount();
+      if (!mounted) {
+        return;
+      }
+      Navigator.of(context).pop(true);
+    } catch (error, stackTrace) {
+      _logger.error(
+        message: 'Delete account request failed',
+        error: error,
+        stackTrace: stackTrace,
+      );
+      if (!mounted) {
+        return;
+      }
+      final l10n = AppLocalizations.of(context)!;
+      final message = error is ApiProblem
+          ? mapApiProblemToMessage(error, l10n)
+          : l10n.errorRequestGeneric;
+      Toast.show(context, message, type: ToastType.error);
+      setState(() {
+        _isDeleting = false;
+      });
+    }
+  }
+}
+
+class _DeleteConfirmDialog extends StatefulWidget {
+  const _DeleteConfirmDialog();
+
+  @override
+  State<_DeleteConfirmDialog> createState() => _DeleteConfirmDialogState();
+}
+
+class _DeleteConfirmDialogState extends State<_DeleteConfirmDialog> {
+  static const int _coolDownSeconds = 5;
+  int _secondsLeft = _coolDownSeconds;
+  Timer? _timer;
+
+  @override
+  void initState() {
+    super.initState();
+    _timer = Timer.periodic(const Duration(seconds: 1), (timer) {
+      if (!mounted) {
+        timer.cancel();
+        return;
+      }
+      if (_secondsLeft <= 1) {
+        setState(() {
+          _secondsLeft = 0;
+        });
+        timer.cancel();
+        return;
+      }
+      setState(() {
+        _secondsLeft -= 1;
+      });
+    });
+  }
+
+  @override
+  void dispose() {
+    _timer?.cancel();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+    final colors = Theme.of(context).colorScheme;
+
+    return Dialog(
+      insetPadding: const EdgeInsets.symmetric(
+        horizontal: AppSpacing.lg,
+        vertical: AppSpacing.xl,
+      ),
+      shape: RoundedRectangleBorder(
+        borderRadius: BorderRadius.circular(AppRadius.xl),
+      ),
+      child: Container(
+        padding: const EdgeInsets.fromLTRB(
+          AppSpacing.lg,
+          AppSpacing.lg,
+          AppSpacing.lg,
+          AppSpacing.md,
+        ),
+        decoration: BoxDecoration(
+          color: colors.surface,
+          borderRadius: BorderRadius.circular(AppRadius.xl),
+          border: Border.all(color: colors.outlineVariant),
+        ),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Container(
+                  width: 36,
+                  height: 36,
+                  decoration: BoxDecoration(
+                    color: colors.surfaceContainerHighest,
+                    borderRadius: BorderRadius.circular(AppRadius.md),
+                  ),
+                  alignment: Alignment.center,
+                  child: Icon(
+                    Icons.warning_rounded,
+                    color: colors.error,
+                    size: 22,
+                  ),
+                ),
+                const SizedBox(width: AppSpacing.sm),
+                Expanded(
+                  child: Text(
+                    l10n.settingsDeleteAccountDialogTitle,
+                    style: Theme.of(context).textTheme.titleLarge?.copyWith(
+                      fontWeight: FontWeight.w700,
+                    ),
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: AppSpacing.md),
+            Text(
+              l10n.settingsDeleteAccountWarningBody,
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: colors.onSurfaceVariant,
+                height: 1.45,
+              ),
+            ),
+            const SizedBox(height: AppSpacing.md),
+            Text(
+              _secondsLeft > 0
+                  ? l10n.settingsDeleteAccountWaitAction(_secondsLeft)
+                  : l10n.settingsDeleteAccountDialogBody,
+              style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                color: colors.error,
+                fontWeight: FontWeight.w600,
+              ),
+            ),
+            const SizedBox(height: AppSpacing.lg),
+            Row(
+              children: [
+                Expanded(
+                  child: OutlinedButton(
+                    onPressed: () => Navigator.of(context).pop(false),
+                    style: OutlinedButton.styleFrom(
+                      foregroundColor: colors.onSurface,
+                      side: BorderSide(color: colors.outline),
+                      minimumSize: const Size.fromHeight(44),
+                      shape: RoundedRectangleBorder(
+                        borderRadius: BorderRadius.circular(AppRadius.full),
+                      ),
+                    ),
+                    child: Text(l10n.settingsCancel),
+                  ),
+                ),
+                const SizedBox(width: AppSpacing.sm),
+                Expanded(
+                  child: FilledButton(
+                    onPressed: _secondsLeft <= 0
+                        ? () => Navigator.of(context).pop(true)
+                        : null,
+                    style: FilledButton.styleFrom(
+                      backgroundColor: colors.error,
+                      foregroundColor: colors.onError,
+                      disabledBackgroundColor: colors.error.withValues(
+                        alpha: 0.4,
+                      ),
+                      disabledForegroundColor: colors.onError.withValues(
+                        alpha: 0.8,
+                      ),
+                      minimumSize: const Size.fromHeight(44),
+                      shape: RoundedRectangleBorder(
+                        borderRadius: BorderRadius.circular(AppRadius.full),
+                      ),
+                    ),
+                    child: Text(l10n.settingsDeleteAccountAction),
+                  ),
+                ),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
diff --git a/apps/lib/features/settings/presentation/screens/settings_screen.dart b/apps/lib/features/settings/presentation/screens/settings_screen.dart
index 84ab40e..4d8b0d3 100644
--- a/apps/lib/features/settings/presentation/screens/settings_screen.dart
+++ b/apps/lib/features/settings/presentation/screens/settings_screen.dart
@@ -5,6 +5,7 @@ import '../../../../shared/theme/design_tokens.dart';
 import '../../../../shared/widgets/app_modal_dialog.dart';
 import '../../../../shared/widgets/gua_icon.dart';
 import '../../data/models/profile_settings.dart';
+import 'account_delete_screen.dart';
 import '../widgets/settings_section_widgets.dart';
 import 'coin_center_screen.dart';
 import 'general_settings_screen.dart';
@@ -22,6 +23,7 @@ class SettingsScreen extends StatefulWidget {
     required this.onSettingsChanged,
     required this.onUploadAvatar,
     required this.onLogout,
+    required this.onDeleteAccount,
     required this.onSaveProfile,
   });
 
@@ -32,6 +34,7 @@ class SettingsScreen extends StatefulWidget {
   final Future<void> Function(ProfileSettingsV1 settings) onSettingsChanged;
   final Future<ProfileSettingsV1> Function(String filePath) onUploadAvatar;
   final Future<void> Function() onLogout;
+  final Future<void> Function() onDeleteAccount;
   final Future<ProfileSettingsV1> Function(ProfileSettingsV1 updated)
   onSaveProfile;
 
@@ -119,6 +122,18 @@ class _SettingsScreenState extends State<SettingsScreen> {
               ),
             ],
           ),
+          SettingsGroupCard(
+            children: [
+              SettingsMenuTile(
+                icon: Icons.person_rounded,
+                title: l10n.settingsAccountAndDataTitle,
+                tint: colors.primary,
+                background: colors.surfaceContainerHighest,
+                showDivider: false,
+                onTap: _openAccountDelete,
+              ),
+            ],
+          ),
           const SizedBox(height: AppSpacing.xl),
           FilledButton(
             onPressed: _confirmLogout,
@@ -194,6 +209,23 @@ class _SettingsScreenState extends State<SettingsScreen> {
     );
   }
 
+  Future<void> _openAccountDelete() async {
+    final deleted = await Navigator.of(context).push<bool>(
+      MaterialPageRoute<bool>(
+        builder: (_) =>
+            AccountDeleteScreen(onDeleteAccount: widget.onDeleteAccount),
+      ),
+    );
+    if (deleted != true) {
+      return;
+    }
+    await widget.onLogout();
+    if (!mounted) {
+      return;
+    }
+    Navigator.of(context).popUntil((route) => route.isFirst);
+  }
+
   Future<void> _confirmLogout() async {
     final l10n = AppLocalizations.of(context)!;
     final confirmed = await showDialog<bool>(
diff --git a/apps/lib/features/settings/presentation/widgets/settings_section_widgets.dart b/apps/lib/features/settings/presentation/widgets/settings_section_widgets.dart
index 37fb261..58f9b0c 100644
--- a/apps/lib/features/settings/presentation/widgets/settings_section_widgets.dart
+++ b/apps/lib/features/settings/presentation/widgets/settings_section_widgets.dart
@@ -62,6 +62,8 @@ class SettingsMenuTile extends StatelessWidget {
     this.showChevron = true,
     this.trailing,
     this.subtitle,
+    this.titleColor,
+    this.subtitleColor,
   });
 
   final IconData icon;
@@ -73,6 +75,8 @@ class SettingsMenuTile extends StatelessWidget {
   final bool showDivider;
   final bool showChevron;
   final Widget? trailing;
+  final Color? titleColor;
+  final Color? subtitleColor;
 
   @override
   Widget build(BuildContext context) {
@@ -94,12 +98,27 @@ class SettingsMenuTile extends StatelessWidget {
             ),
             child: Icon(icon, color: tint),
           ),
-          title: Text(title),
+          title: Text(
+            title,
+            style: titleColor == null
+                ? null
+                : Theme.of(context).textTheme.bodyLarge?.copyWith(
+                    color: titleColor,
+                    fontWeight: FontWeight.w600,
+                  ),
+          ),
           subtitle: subtitle == null
               ? null
               : Padding(
                   padding: const EdgeInsets.only(top: AppSpacing.xs),
-                  child: Text(subtitle!),
+                  child: Text(
+                    subtitle!,
+                    style: subtitleColor == null
+                        ? null
+                        : Theme.of(
+                            context,
+                          ).textTheme.bodySmall?.copyWith(color: subtitleColor),
+                  ),
                 ),
           trailing:
               trailing ??
@@ -162,7 +181,7 @@ class SettingsSwitchTile extends StatelessWidget {
           trailing: Switch(
             value: value,
             onChanged: onChanged,
-            activeColor: colors.primary,
+            activeThumbColor: colors.primary,
           ),
         ),
         if (showDivider)
diff --git a/apps/lib/l10n/app_en.arb b/apps/lib/l10n/app_en.arb
index 9398c11..b0ccb7d 100644
--- a/apps/lib/l10n/app_en.arb
+++ b/apps/lib/l10n/app_en.arb
@@ -82,6 +82,7 @@
   "settingsSectionAccount": "Account",
   "settingsSectionPrivacy": "Privacy",
   "settingsSectionNotification": "Notification Settings",
+  "settingsAccountAndDataTitle": "Account Data",
   "settingsInterfaceLanguage": "Interface Language",
   "settingsAiLanguage": "AI Response Language",
   "settingsNotificationAllow": "Allow Notifications",
@@ -141,6 +142,25 @@
   "settingsLogoutSubtitle": "Sign out from the current account",
   "settingsLogoutDialogTitle": "Confirm logout?",
   "settingsLogoutDialogBody": "You will need to sign in again to continue with this account.",
+  "settingsDeleteAccountTitle": "Delete Account",
+  "settingsDeleteAccountSubtitle": "Permanently delete your account and personal data",
+  "settingsDeleteAccountWarningTitle": "Please confirm before deleting",
+  "settingsDeleteAccountWarningBody": "After deletion, related data including profile, history, and points will be permanently removed and cannot be restored.",
+  "settingsDeleteAccountScopeProfile": "Profile and account information will be deleted",
+  "settingsDeleteAccountScopeHistory": "Divination history records will be deleted",
+  "settingsDeleteAccountScopePoints": "Points account and ledger records will be deleted",
+  "settingsDeleteAccountDialogTitle": "Permanently delete this account?",
+  "settingsDeleteAccountDialogBody": "This action cannot be undone. Deletion will start immediately after confirmation.",
+  "settingsDeleteAccountAction": "Delete Account",
+  "settingsDeleteAccountProcessing": "Deleting...",
+  "settingsDeleteAccountWaitAction": "Wait {seconds}s before confirming deletion",
+  "@settingsDeleteAccountWaitAction": {
+    "placeholders": {
+      "seconds": {
+        "type": "int"
+      }
+    }
+  },
   "settingsCancel": "Cancel",
   "settingsLogoutConfirmHint": "Tap again to confirm logout",
   "settingsLogoutConfirmAction": "Tap again to logout",
@@ -202,6 +222,7 @@
   "errorServiceUnavailable": "Service unavailable, please try again later",
   "errorServerGeneric": "Server error, please try again later",
   "errorRequestGeneric": "Request failed, please try again",
+  "errorProfileDeleteFailed": "Failed to delete account, please try again",
   "errorRunLimitExceeded": "Run limit reached in this session. Please start a new divination.",
   "errorDivinationPayloadRequired": "Missing divination payload. Please cast again.",
   "divinationScreenTitle": "Cast Hexagram",
diff --git a/apps/lib/l10n/app_localizations.dart b/apps/lib/l10n/app_localizations.dart
index 6cf06d3..4cff5af 100644
--- a/apps/lib/l10n/app_localizations.dart
+++ b/apps/lib/l10n/app_localizations.dart
@@ -506,6 +506,12 @@ abstract class AppLocalizations {
   /// **'通知设置'**
   String get settingsSectionNotification;
 
+  /// No description provided for @settingsAccountAndDataTitle.
+  ///
+  /// In zh, this message translates to:
+  /// **'账号数据'**
+  String get settingsAccountAndDataTitle;
+
   /// No description provided for @settingsInterfaceLanguage.
   ///
   /// In zh, this message translates to:
@@ -728,6 +734,78 @@ abstract class AppLocalizations {
   /// **'退出后需要重新登录才能继续使用当前账户。'**
   String get settingsLogoutDialogBody;
 
+  /// No description provided for @settingsDeleteAccountTitle.
+  ///
+  /// In zh, this message translates to:
+  /// **'删除账号'**
+  String get settingsDeleteAccountTitle;
+
+  /// No description provided for @settingsDeleteAccountSubtitle.
+  ///
+  /// In zh, this message translates to:
+  /// **'永久删除账号及相关个人数据'**
+  String get settingsDeleteAccountSubtitle;
+
+  /// No description provided for @settingsDeleteAccountWarningTitle.
+  ///
+  /// In zh, this message translates to:
+  /// **'删除前请确认'**
+  String get settingsDeleteAccountWarningTitle;
+
+  /// No description provided for @settingsDeleteAccountWarningBody.
+  ///
+  /// In zh, this message translates to:
+  /// **'删除账号后，个人资料、历史记录、点数信息等相关数据将被永久删除，且不可恢复。'**
+  String get settingsDeleteAccountWarningBody;
+
+  /// No description provided for @settingsDeleteAccountScopeProfile.
+  ///
+  /// In zh, this message translates to:
+  /// **'个人资料和账号信息会被删除'**
+  String get settingsDeleteAccountScopeProfile;
+
+  /// No description provided for @settingsDeleteAccountScopeHistory.
+  ///
+  /// In zh, this message translates to:
+  /// **'历史解卦记录会被删除'**
+  String get settingsDeleteAccountScopeHistory;
+
+  /// No description provided for @settingsDeleteAccountScopePoints.
+  ///
+  /// In zh, this message translates to:
+  /// **'点数账户与流水记录会被删除'**
+  String get settingsDeleteAccountScopePoints;
+
+  /// No description provided for @settingsDeleteAccountDialogTitle.
+  ///
+  /// In zh, this message translates to:
+  /// **'确认永久删除账号？'**
+  String get settingsDeleteAccountDialogTitle;
+
+  /// No description provided for @settingsDeleteAccountDialogBody.
+  ///
+  /// In zh, this message translates to:
+  /// **'此操作无法撤销。确认后将立即发起删除。'**
+  String get settingsDeleteAccountDialogBody;
+
+  /// No description provided for @settingsDeleteAccountAction.
+  ///
+  /// In zh, this message translates to:
+  /// **'确认删除账号'**
+  String get settingsDeleteAccountAction;
+
+  /// No description provided for @settingsDeleteAccountProcessing.
+  ///
+  /// In zh, this message translates to:
+  /// **'正在删除...'**
+  String get settingsDeleteAccountProcessing;
+
+  /// No description provided for @settingsDeleteAccountWaitAction.
+  ///
+  /// In zh, this message translates to:
+  /// **'请等待 {seconds} 秒后确认删除'**
+  String settingsDeleteAccountWaitAction(int seconds);
+
   /// No description provided for @settingsCancel.
   ///
   /// In zh, this message translates to:
@@ -1010,6 +1088,12 @@ abstract class AppLocalizations {
   /// **'请求失败，请稍后重试'**
   String get errorRequestGeneric;
 
+  /// No description provided for @errorProfileDeleteFailed.
+  ///
+  /// In zh, this message translates to:
+  /// **'删除账号失败，请稍后重试'**
+  String get errorProfileDeleteFailed;
+
   /// No description provided for @errorRunLimitExceeded.
   ///
   /// In zh, this message translates to:
diff --git a/apps/lib/l10n/app_localizations_en.dart b/apps/lib/l10n/app_localizations_en.dart
index 3fc9b60..eebed96 100644
--- a/apps/lib/l10n/app_localizations_en.dart
+++ b/apps/lib/l10n/app_localizations_en.dart
@@ -222,6 +222,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get settingsSectionNotification => 'Notification Settings';
 
+  @override
+  String get settingsAccountAndDataTitle => 'Account Data';
+
   @override
   String get settingsInterfaceLanguage => 'Interface Language';
 
@@ -349,6 +352,52 @@ class AppLocalizationsEn extends AppLocalizations {
   String get settingsLogoutDialogBody =>
       'You will need to sign in again to continue with this account.';
 
+  @override
+  String get settingsDeleteAccountTitle => 'Delete Account';
+
+  @override
+  String get settingsDeleteAccountSubtitle =>
+      'Permanently delete your account and personal data';
+
+  @override
+  String get settingsDeleteAccountWarningTitle =>
+      'Please confirm before deleting';
+
+  @override
+  String get settingsDeleteAccountWarningBody =>
+      'After deletion, related data including profile, history, and points will be permanently removed and cannot be restored.';
+
+  @override
+  String get settingsDeleteAccountScopeProfile =>
+      'Profile and account information will be deleted';
+
+  @override
+  String get settingsDeleteAccountScopeHistory =>
+      'Divination history records will be deleted';
+
+  @override
+  String get settingsDeleteAccountScopePoints =>
+      'Points account and ledger records will be deleted';
+
+  @override
+  String get settingsDeleteAccountDialogTitle =>
+      'Permanently delete this account?';
+
+  @override
+  String get settingsDeleteAccountDialogBody =>
+      'This action cannot be undone. Deletion will start immediately after confirmation.';
+
+  @override
+  String get settingsDeleteAccountAction => 'Delete Account';
+
+  @override
+  String get settingsDeleteAccountProcessing => 'Deleting...';
+
+  @override
+  String settingsDeleteAccountWaitAction(int seconds) {
+    return 'Wait ${seconds}s before confirming deletion';
+  }
+
   @override
   String get settingsCancel => 'Cancel';
 
@@ -501,6 +550,10 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get errorRequestGeneric => 'Request failed, please try again';
 
+  @override
+  String get errorProfileDeleteFailed =>
+      'Failed to delete account, please try again';
+
   @override
   String get errorRunLimitExceeded =>
       'Run limit reached in this session. Please start a new divination.';
diff --git a/apps/lib/l10n/app_localizations_zh.dart b/apps/lib/l10n/app_localizations_zh.dart
index 51ab4fd..e60c685 100644
--- a/apps/lib/l10n/app_localizations_zh.dart
+++ b/apps/lib/l10n/app_localizations_zh.dart
@@ -220,6 +220,9 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get settingsSectionNotification => '通知设置';
 
+  @override
+  String get settingsAccountAndDataTitle => '账号数据';
+
   @override
   String get settingsInterfaceLanguage => '界面语言';
 
@@ -343,6 +346,45 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get settingsLogoutDialogBody => '退出后需要重新登录才能继续使用当前账户。';
 
+  @override
+  String get settingsDeleteAccountTitle => '删除账号';
+
+  @override
+  String get settingsDeleteAccountSubtitle => '永久删除账号及相关个人数据';
+
+  @override
+  String get settingsDeleteAccountWarningTitle => '删除前请确认';
+
+  @override
+  String get settingsDeleteAccountWarningBody =>
+      '删除账号后，个人资料、历史记录、点数信息等相关数据将被永久删除，且不可恢复。';
+
+  @override
+  String get settingsDeleteAccountScopeProfile => '个人资料和账号信息会被删除';
+
+  @override
+  String get settingsDeleteAccountScopeHistory => '历史解卦记录会被删除';
+
+  @override
+  String get settingsDeleteAccountScopePoints => '点数账户与流水记录会被删除';
+
+  @override
+  String get settingsDeleteAccountDialogTitle => '确认永久删除账号？';
+
+  @override
+  String get settingsDeleteAccountDialogBody => '此操作无法撤销。确认后将立即发起删除。';
+
+  @override
+  String get settingsDeleteAccountAction => '确认删除账号';
+
+  @override
+  String get settingsDeleteAccountProcessing => '正在删除...';
+
+  @override
+  String settingsDeleteAccountWaitAction(int seconds) {
+    return '请等待 $seconds 秒后确认删除';
+  }
+
   @override
   String get settingsCancel => '取消';
 
@@ -491,6 +533,9 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get errorRequestGeneric => '请求失败，请稍后重试';
 
+  @override
+  String get errorProfileDeleteFailed => '删除账号失败，请稍后重试';
+
   @override
   String get errorRunLimitExceeded => '本次会话追问次数已达上限，请新起一卦';
 
diff --git a/apps/lib/l10n/app_zh.arb b/apps/lib/l10n/app_zh.arb
index 7a0347b..06b6728 100644
--- a/apps/lib/l10n/app_zh.arb
+++ b/apps/lib/l10n/app_zh.arb
@@ -82,6 +82,7 @@
   "settingsSectionAccount": "账户操作",
   "settingsSectionPrivacy": "隐私设置",
   "settingsSectionNotification": "通知设置",
+  "settingsAccountAndDataTitle": "账号数据",
   "settingsInterfaceLanguage": "界面语言",
   "settingsAiLanguage": "AI回复语言",
   "settingsNotificationAllow": "允许通知",
@@ -141,6 +142,25 @@
   "settingsLogoutSubtitle": "退出当前登录账户",
   "settingsLogoutDialogTitle": "确认退出登录？",
   "settingsLogoutDialogBody": "退出后需要重新登录才能继续使用当前账户。",
+  "settingsDeleteAccountTitle": "删除账号",
+  "settingsDeleteAccountSubtitle": "永久删除账号及相关个人数据",
+  "settingsDeleteAccountWarningTitle": "删除前请确认",
+  "settingsDeleteAccountWarningBody": "删除账号后，个人资料、历史记录、点数信息等相关数据将被永久删除，且不可恢复。",
+  "settingsDeleteAccountScopeProfile": "个人资料和账号信息会被删除",
+  "settingsDeleteAccountScopeHistory": "历史解卦记录会被删除",
+  "settingsDeleteAccountScopePoints": "点数账户与流水记录会被删除",
+  "settingsDeleteAccountDialogTitle": "确认永久删除账号？",
+  "settingsDeleteAccountDialogBody": "此操作无法撤销。确认后将立即发起删除。",
+  "settingsDeleteAccountAction": "确认删除账号",
+  "settingsDeleteAccountProcessing": "正在删除...",
+  "settingsDeleteAccountWaitAction": "请等待 {seconds} 秒后确认删除",
+  "@settingsDeleteAccountWaitAction": {
+    "placeholders": {
+      "seconds": {
+        "type": "int"
+      }
+    }
+  },
   "settingsCancel": "取消",
   "settingsLogoutConfirmHint": "再次点击确认退出登录",
   "settingsLogoutConfirmAction": "再次点击确认退出",
@@ -202,6 +222,7 @@
   "errorServiceUnavailable": "服务暂时不可用，请稍后重试",
   "errorServerGeneric": "服务异常，请稍后重试",
   "errorRequestGeneric": "请求失败，请稍后重试",
+  "errorProfileDeleteFailed": "删除账号失败，请稍后重试",
   "errorRunLimitExceeded": "本次会话追问次数已达上限，请新起一卦",
   "errorDivinationPayloadRequired": "缺少六爻输入数据，请重新起卦",
   "divinationScreenTitle": "起卦",
diff --git a/backend/alembic/versions/20260407_0002_add_invite_codes.py b/backend/alembic/versions/20260407_0002_add_invite_codes.py
index 97abd41..05c085d 100644
--- a/backend/alembic/versions/20260407_0002_add_invite_codes.py
+++ b/backend/alembic/versions/20260407_0002_add_invite_codes.py
@@ -124,7 +124,7 @@ def upgrade() -> None:
                 lifetime_spent,
                 version
             )
-            VALUES (new.id, 100, 0, 100, 0, 0)
+            VALUES (new.id, 60, 0, 60, 0, 0)
             ON CONFLICT (user_id) DO NOTHING;
 
             INSERT INTO public.points_ledger (
@@ -144,8 +144,8 @@ def upgrade() -> None:
                 v_ledger_id,
                 new.id,
                 1,
-                100,
-                100,
+                60,
+                60,
                 'register',
                 null,
                 null,
@@ -269,7 +269,7 @@ def downgrade() -> None:
                 lifetime_spent,
                 version
             )
-            VALUES (new.id, 100, 0, 100, 0, 0)
+            VALUES (new.id, 60, 0, 60, 0, 0)
             ON CONFLICT (user_id) DO NOTHING;
 
             INSERT INTO public.points_ledger (
@@ -289,8 +289,8 @@ def downgrade() -> None:
                 v_ledger_id,
                 new.id,
                 1,
-                100,
-                100,
+                60,
+                60,
                 'register',
                 null,
                 null,
diff --git a/backend/alembic/versions/20260409_0004_update_signup_welcome_points_to_60.py b/backend/alembic/versions/20260409_0004_update_signup_welcome_points_to_60.py
new file mode 100644
index 0000000..a632a44
--- /dev/null
+++ b/backend/alembic/versions/20260409_0004_update_signup_welcome_points_to_60.py
@@ -0,0 +1,54 @@
+"""update signup welcome points from 100 to 60
+
+Revision ID: 20260409_0004
+Revises: 20260407_0003
+Create Date: 2026-04-09 00:00:00
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+
+revision: str = "20260409_0004"
+down_revision: Union[str, Sequence[str], None] = "20260407_0003"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def _rewrite_signup_function(*, from_points: int, to_points: int) -> None:
+    op.execute(
+        f"""
+        DO $$
+        DECLARE
+            v_def text;
+            v_from_points text := '{from_points}';
+            v_to_points text := '{to_points}';
+        BEGIN
+            SELECT pg_get_functiondef('public.initialize_profile_and_invite_code_on_signup()'::regprocedure)
+            INTO v_def;
+
+            v_def := regexp_replace(
+                v_def,
+                'VALUES \\(new\\.id,\\s*' || v_from_points || ',\\s*0,\\s*' || v_from_points || ',\\s*0,\\s*0\\)',
+                'VALUES (new.id, ' || v_to_points || ', 0, ' || v_to_points || ', 0, 0)'
+            );
+
+            v_def := regexp_replace(
+                v_def,
+                E'\\n\\s*' || v_from_points || ',\\n\\s*' || v_from_points || ',\\n\\s*''register''',
+                E'\\n                ' || v_to_points || ',\\n                ' || v_to_points || ',\\n                ''register'''
+            );
+
+            EXECUTE v_def;
+        END;
+        $$;
+        """
+    )
+
+
+def upgrade() -> None:
+    _rewrite_signup_function(from_points=100, to_points=60)
+
+
+def downgrade() -> None:
+    _rewrite_signup_function(from_points=60, to_points=100)
diff --git a/backend/src/services/base/supabase.py b/backend/src/services/base/supabase.py
index 5df94f9..728dab6 100644
--- a/backend/src/services/base/supabase.py
+++ b/backend/src/services/base/supabase.py
@@ -271,6 +271,76 @@ class SupabaseService(BaseServiceProvider):
                 return signed_url
         raise RuntimeError("Invalid signed url payload")
 
+    async def delete_prefix(self, *, bucket: str, prefix: str) -> int:
+        normalized_prefix = prefix.strip("/")
+
+        def _delete_prefix() -> int:
+            bucket_client = self._ensure_bucket_client(bucket)
+            list_objects = getattr(bucket_client, "list", None)
+            remove_objects = getattr(bucket_client, "remove", None)
+            if not callable(list_objects) or not callable(remove_objects):
+                raise RuntimeError("Supabase storage delete APIs are unavailable")
+
+            offset = 0
+            limit = 100
+            total_deleted = 0
+
+            while True:
+                options = {
+                    "limit": limit,
+                    "offset": offset,
+                    "sortBy": {"column": "name", "order": "asc"},
+                }
+                try:
+                    raw_entries = list_objects(normalized_prefix, options)
+                except TypeError:
+                    raw_entries = list_objects(normalized_prefix)
+
+                entries = raw_entries if isinstance(raw_entries, list) else []
+                if not entries:
+                    break
+
+                paths: list[str] = []
+                for entry in entries:
+                    name: str | None = None
+                    if isinstance(entry, dict):
+                        raw_name = entry.get("name")
+                        if isinstance(raw_name, str) and raw_name:
+                            name = raw_name
+                    else:
+                        raw_name = getattr(entry, "name", None)
+                        if isinstance(raw_name, str) and raw_name:
+                            name = raw_name
+                    if name is None:
+                        continue
+                    if normalized_prefix:
+                        paths.append(f"{normalized_prefix}/{name}")
+                    else:
+                        paths.append(name)
+
+                if paths:
+                    remove_objects(paths)
+                    total_deleted += len(paths)
+
+                if len(entries) < limit:
+                    break
+                offset += limit
+
+            return total_deleted
+
+        return await asyncio.to_thread(_delete_prefix)
+
+    async def delete_auth_user(self, *, user_id: str) -> None:
+        def _delete_auth_user() -> None:
+            admin_client = self.get_admin_client()
+            auth_admin = getattr(getattr(admin_client, "auth", None), "admin", None)
+            delete_user = getattr(auth_admin, "delete_user", None)
+            if not callable(delete_user):
+                raise RuntimeError("Supabase admin delete_user API is unavailable")
+            delete_user(user_id)
+
+        await asyncio.to_thread(_delete_auth_user)
+
     def parse_signed_url(self, url: str) -> tuple[str, str]:
         from urllib.parse import urlparse
 
diff --git a/backend/src/v1/users/router.py b/backend/src/v1/users/router.py
index 08b70ec..1914132 100644
--- a/backend/src/v1/users/router.py
+++ b/backend/src/v1/users/router.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from fastapi import APIRouter, Depends, File, UploadFile
+from fastapi import APIRouter, Depends, File, Response, UploadFile
 
 from v1.users.dependencies import get_user_service
 from v1.users.schemas import (
@@ -54,3 +54,11 @@ async def upload_avatar(
     service: UserService = Depends(get_user_service),
 ) -> ProfileResponse:
     return await service.upload_avatar(file)
+
+
+@router.delete("/me", status_code=204)
+async def delete_my_account(
+    service: UserService = Depends(get_user_service),
+) -> Response:
+    await service.delete_account()
+    return Response(status_code=204)
diff --git a/backend/src/v1/users/service.py b/backend/src/v1/users/service.py
index fadfc2f..557ea4b 100644
--- a/backend/src/v1/users/service.py
+++ b/backend/src/v1/users/service.py
@@ -290,6 +290,46 @@ class UserService:
         await self.repository.save()
         return await self.get_profile()
 
+    async def delete_account(self) -> None:
+        user_id = str(self.current_user.id)
+        avatar_bucket = config.storage.avatar.bucket
+        avatar_prefix = f"{self.current_user.id}/"
+
+        try:
+            await self.attachment_storage.delete_prefix(
+                bucket=avatar_bucket,
+                prefix=avatar_prefix,
+            )
+        except Exception as exc:
+            logger.exception(
+                "Account deletion failed while cleaning avatar objects",
+                user_id=user_id,
+                bucket=avatar_bucket,
+                prefix=avatar_prefix,
+            )
+            raise ApiProblemError(
+                status_code=502,
+                detail=problem_payload(
+                    code="PROFILE_DELETE_FAILED",
+                    detail="Failed to delete account data",
+                ),
+            ) from exc
+
+        try:
+            await self.attachment_storage.delete_auth_user(user_id=user_id)
+        except Exception as exc:
+            logger.exception(
+                "Account deletion failed while deleting auth user",
+                user_id=user_id,
+            )
+            raise ApiProblemError(
+                status_code=502,
+                detail=problem_payload(
+                    code="PROFILE_DELETE_FAILED",
+                    detail="Failed to delete account data",
+                ),
+            ) from exc
+
     async def _resolve_avatar_url(self, avatar_path: str | None) -> str | None:
         if avatar_path is None:
             return None
diff --git a/backend/tests/unit/test_user_service_delete_account.py b/backend/tests/unit/test_user_service_delete_account.py
new file mode 100644
index 0000000..e83abac
--- /dev/null
+++ b/backend/tests/unit/test_user_service_delete_account.py
@@ -0,0 +1,94 @@
+from __future__ import annotations
+
+from uuid import uuid4
+
+import pytest
+
+from core.auth.models import CurrentUser
+from core.http.errors import ApiProblemError
+from v1.users.service import UserService
+
+
+class _NoopRepository:
+    pass
+
+
+class _FakeStorage:
+    def __init__(self) -> None:
+        self.deleted_prefix_calls: list[tuple[str, str]] = []
+        self.deleted_auth_user_calls: list[str] = []
+
+    async def delete_prefix(self, *, bucket: str, prefix: str) -> int:
+        self.deleted_prefix_calls.append((bucket, prefix))
+        return 0
+
+    async def delete_auth_user(self, *, user_id: str) -> None:
+        self.deleted_auth_user_calls.append(user_id)
+
+
+@pytest.mark.asyncio
+async def test_delete_account_success_calls_storage_cleanup_and_auth_delete() -> None:
+    user = CurrentUser(id=uuid4(), email="test@example.com")
+    storage = _FakeStorage()
+    service = UserService(
+        current_user=user,
+        repository=_NoopRepository(),  # type: ignore[arg-type]
+        attachment_storage=storage,  # type: ignore[arg-type]
+    )
+
+    await service.delete_account()
+
+    assert storage.deleted_prefix_calls == [("avatars", f"{user.id}/")]
+    assert storage.deleted_auth_user_calls == [str(user.id)]
+
+
+@pytest.mark.asyncio
+async def test_delete_account_raises_profile_delete_failed_on_storage_cleanup_error() -> (
+    None
+):
+    user = CurrentUser(id=uuid4(), email="test@example.com")
+
+    class _FailingStorage(_FakeStorage):
+        async def delete_prefix(self, *, bucket: str, prefix: str) -> int:
+            raise RuntimeError("storage unavailable")
+
+    storage = _FailingStorage()
+    service = UserService(
+        current_user=user,
+        repository=_NoopRepository(),  # type: ignore[arg-type]
+        attachment_storage=storage,  # type: ignore[arg-type]
+    )
+
+    with pytest.raises(ApiProblemError) as exc_info:
+        await service.delete_account()
+
+    err = exc_info.value
+    assert err.status_code == 502
+    assert err.code == "PROFILE_DELETE_FAILED"
+    assert storage.deleted_auth_user_calls == []
+
+
+@pytest.mark.asyncio
+async def test_delete_account_raises_profile_delete_failed_on_auth_delete_error() -> (
+    None
+):
+    user = CurrentUser(id=uuid4(), email="test@example.com")
+
+    class _FailingStorage(_FakeStorage):
+        async def delete_auth_user(self, *, user_id: str) -> None:
+            raise RuntimeError("delete user failed")
+
+    storage = _FailingStorage()
+    service = UserService(
+        current_user=user,
+        repository=_NoopRepository(),  # type: ignore[arg-type]
+        attachment_storage=storage,  # type: ignore[arg-type]
+    )
+
+    with pytest.raises(ApiProblemError) as exc_info:
+        await service.delete_account()
+
+    err = exc_info.value
+    assert err.status_code == 502
+    assert err.code == "PROFILE_DELETE_FAILED"
+    assert storage.deleted_prefix_calls == [("avatars", f"{user.id}/")]
diff --git a/docs/bugs/2026-04-08-followup-entry-bug.md b/docs/bugs/2026-04-08-followup-entry-bug.md
deleted file mode 100644
index 82aa639..0000000
--- a/docs/bugs/2026-04-08-followup-entry-bug.md
+++ /dev/null
@@ -1,89 +0,0 @@
-# Bug: 追问1次后无法进入查看历史记录
-
-日期：2026-04-08
-状态：已确认（未修复）
-
-## 问题描述
-
-追问1次之后追问入口关闭，但用户也没法点击进去查看追问的历史记录。
-
-## 根因分析
-
-`_loadFollowUpEligibility()` 方法（`divination_result_screen.dart:65-83`）将两个概念混为一谈：
-
-```dart
-Future<void> _loadFollowUpEligibility() async {
-  ...
-  final messages = await widget.divinationApi!.getSessionMessages(
-    threadId: widget.data.threadId!,
-  );
-  final userCount = messages.where((msg) => msg.role == 'user').length;
-  ...
-  setState(() {
-    _canFollowUp = userCount < 2;  // 同时控制"能追问"和"能进入"
-    ...
-  });
-}
-```
-
-按钮逻辑（`divination_result_screen.dart:367`）：
-```dart
-onPressed: (!_canFollowUp || _followUpEligibilityLoading)
-    ? null  // _canFollowUp = false 时按钮完全禁用
-    : () {
-        Navigator.of(context).push(
-          MaterialPageRoute<void>(
-            builder: (_) => FollowUpChatScreen(...),
-          ),
-        );
-      },
-```
-
-**问题**：
-- `_canFollowUp = userCount < 2` 控制的是"是否还有追问配额"
-- 但 `onPressed` 把它和"是否能进入查看历史"混用了
-- 导致用户追问1次后（userCount=2），`_canFollowUp=false`，按钮被禁用
-- 用户**无法进入追问页面查看历史记录**
-
-**业务逻辑分析**：
-- 每 session 最多2次追问（首问1次 + 追问1次）
-- 追问1次后，用户不能再发送新追问
-- 但**应该仍能进入查看历史记录**
-
-### 正确的逻辑应该是
-
-```dart
-// 追问配额判断
-_canFollowUp = userCount < 2;
-
-// 能否进入查看历史（与追问次数无关，只要有历史消息就能进入）
-_canEnterFollowUpChat = messages.isNotEmpty;  // 或者只要有 threadId 就能进
-
-// 按钮文案
-buttonText = _canFollowUp ? l10n.followUpEntryHint : l10n.followUpViewHistory;
-
-// 按钮是否禁用
-onPressed = (_followUpEligibilityLoading)
-    ? null  // 只在加载中时禁用
-    : () { ... }  // 始终可点击进入查看
-```
-
-## 证据
-
-- 结果页代码：`apps/lib/features/divination/presentation/screens/divination_result_screen.dart`
-  - `_buildFollowUpBar`: 行 338-394
-  - `_loadFollowUpEligibility`: 行 65-83
-  - 按钮 onPress: 行 367
-- 追问聊天页：`apps/lib/features/divination/presentation/screens/follow_up_chat_screen.dart`
-
-## 修复方向
-
-1. 分离"能否追问"和"能否进入查看历史"的逻辑
-2. 按钮文案根据状态显示不同内容（能追问显示追问提示，已用完显示"查看历史"）
-3. 只要有 `threadId`，用户就应该能进入查看历史
-
----
-
-## 相关文档
-
-- 随访工程计划：`docs/plans/2026-04-08-followup-session-history-eng-plan.md`
diff --git a/docs/bugs/2026-04-08-followup-loading-and-voice-bug.md b/docs/bugs/2026-04-08-followup-loading-and-voice-bug.md
deleted file mode 100644
index 65e5230..0000000
--- a/docs/bugs/2026-04-08-followup-loading-and-voice-bug.md
+++ /dev/null
@@ -1,261 +0,0 @@
-# Bug: 追问页面 UI 问题
-
-日期：2026-04-08
-状态：已确认（未修复）
-
-## Bug 1: 追问页发送时顶部和消息下方重复加载UI
-
-### 问题描述
-
-在追问页面，用户输入信息发送后，顶部和消息下方同时出现加载UI，但顶部的加载UI是多余的。
-
-### 根因分析
-
-**文件**：`apps/lib/features/divination/presentation/screens/follow_up_chat_screen.dart`
-
-**问题代码**：
-
-1. 顶部 step 指示器（第 85-124 行）：
-```dart
-if (_sending && _currentStepName != null)
-  Container(
-    // 显示 step 进度，如 "解读中..."、"推理中..."
-    child: Row(
-      children: [
-        CircularProgressIndicator(...),
-        Text(_stepLabel(_currentStepName!)),
-      ],
-    ),
-  )
-```
-
-2. 消息下方 streaming placeholder（第 565-584 行）：
-```dart
-isStreamingPlaceholder
-    ? Row(
-        mainAxisSize: MainAxisSize.min,
-        children: [
-          CircularProgressIndicator(...),
-          Text(l10n.followUpGenerating),  // "生成中..."
-        ],
-      )
-```
-
-**事件触发流程**：
-
-| 顺序 | 事件 | 顶部指示器 | 消息下方 |
-|------|------|----------|---------|
-| 1 | `_submitText()` 调用 | 无 | streaming placeholder 显示 "生成中..." |
-| 2 | `STEP_STARTED(stepName='divination')` | 显示 "解读中..." | 继续显示 |
-| 3 | `STEP_FINISHED` | 消失 | 继续显示 |
-| 4 | `STEP_STARTED(stepName='worker')` | 显示 "推理中..." | **同时显示** "生成中..." |
-| 5 | `STEP_FINISHED` | 消失 | 继续显示 |
-| 6 | `TEXT_MESSAGE_END` | 无 | placeholder 消失，显示真实内容 |
-
-**问题**：在 worker 阶段（步骤 4），顶部显示 "推理中..." 同时消息下方显示 "生成中..."，造成重复反馈。用户只需要一个加载反馈即可。
-
-**修复方向**：
-
-1. **方案A**：只在 divination 阶段显示顶部 step 指示器，worker 阶段隐藏（因为 streaming placeholder 已经提供反馈）
-
-   ```dart
-   // 第 85 行修改
-   if (_sending && _currentStepName != null && _currentStepName != 'worker')
-   ```
-
-2. **方案B**：移除顶部 step 指示器，完全依赖 streaming placeholder
-
-3. **方案C**：在 worker 阶段隐藏 streaming placeholder，只显示顶部指示器
-
-推荐 **方案A**，因为：
-- divination 阶段没有 streaming placeholder，需要顶部指示器提供反馈
-- worker 阶段有 streaming placeholder，不需要顶部指示器
-- 改动最小，只加一个条件
-
----
-
-## Bug 2: 语音模式录制时缺少动画UI
-
-### 问题描述
-
-根据 social-app 的实现，按住说话模式下录音时应该有动画效果，但 eryao 的实现只有文字，没有动画。
-
-### 根因分析
-
-**对比**：
-
-| 功能 | social-app | eryao |
-|------|------------|-------|
-| 录音中动画 | `recordingAnimation` widget（外部传入） | 只有文字 "录音中..." |
-| 录音提示文字 | 带动画的 widget | 只有文字 |
-| 录音中隐藏输入区域 | `IgnorePointer` + `Opacity` | 未实现 |
-
-**eryao 当前实现**（`message_composer.dart:159-172`）：
-```dart
-if (_isRecording) {
-  if (!showRecordingInlineFeedback) {
-    return Text(recordingText, ...);
-  }
-  return Column(
-    mainAxisAlignment: MainAxisAlignment.center,
-    children: [
-      const SizedBox(width: 16, height: 16),  // 空白占位
-      const SizedBox(height: AppSpacing.xs),
-      Text(recordingText, ...),               // "录音中..."
-      const SizedBox(height: AppSpacing.xs),
-      Text(recordingHintText, ...),           // "上滑取消"
-    ],
-  );
-}
-```
-
-**social-app 实现**（`message_composer.dart:222-239`）：
-```dart
-if (_isRecording) {
-  if (!showRecordingInlineFeedback) {
-    return Text(resolvedRecordingText, ...);
-  }
-  return Column(
-    mainAxisAlignment: MainAxisAlignment.center,
-    children: [
-      recordingAnimation,                      // 动画widget（外部传入）
-      const SizedBox(height: AppSpacing.xs),
-      Text(resolvedRecordingText, ...),
-      const SizedBox(height: AppSpacing.xs),
-      Text(resolvedRecordingHintText, ...),
-    ],
-  );
-}
-```
-
-**差异**：
-1. `recordingAnimation` widget 缺失 - 需要外部传入，eryao 直接用空白占位
-2. 录音中图标/按钮没有动画效果
-
-**修复方向**：
-
-1. 在 `FollowUpChatScreen` 或其父组件中创建 `recordingAnimation` widget
-2. 将 `recordingAnimation` 通过 `MessageComposer` 传入
-3. 参考 social-app 的实现，使用脉冲动画或波形动画
-
-**参考实现**（需要添加 `recording_animation.dart`）：
-
-```dart
-class RecordingAnimation extends StatefulWidget {
-  final double size;
-  final Color color;
-  
-  @override
-  State<RecordingAnimation> createState() => _RecordingAnimationState();
-}
-
-class _RecordingAnimationState extends State<RecordingAnimation>
-    with SingleTickerProviderStateMixin {
-  late AnimationController _controller;
-  late Animation<double> _scaleAnimation;
-  
-  @override
-  void initState() {
-    super.initState();
-    _controller = AnimationController(
-      duration: const Duration(milliseconds: 1000),
-      vsync: this,
-    )..repeat(reverse: true);
-    _scaleAnimation = Tween<double>(begin: 1.0, end: 1.2).animate(
-      CurvedAnimation(parent: _controller, curve: Curves.easeInOut),
-    );
-  }
-  
-  @override
-  void dispose() {
-    _controller.dispose();
-    super.dispose();
-  }
-  
-  @override
-  Widget build(BuildContext context) {
-    return AnimatedBuilder(
-      animation: _scaleAnimation,
-      builder: (context, child) {
-        return Transform.scale(
-          scale: _scaleAnimation.value,
-          child: Container(
-            width: widget.size,
-            height: widget.size,
-            decoration: BoxDecoration(
-              shape: BoxShape.circle,
-              color: widget.color.withValues(alpha: 0.3),
-            ),
-            child: Icon(Icons.mic, color: widget.color, size: widget.size * 0.6),
-          ),
-        );
-      },
-    );
-  }
-}
-```
-
----
-
-## Bug 2 & 3: 直接复用 social-app 输入框（不需要 plus 按钮）
-
-### 需求
-
-**直接复用** social-app 的 `MessageComposer`，但**不需要 plus 按钮**。
-
-### 复用清单
-
-| 功能 | social-app | eryao | 处理 |
-|------|------------|-------|------|
-| `recordingAnimation` | required Widget | 空白占位 | **需要添加** |
-| 双层阴影 | 有 | 无 | **需要添加** |
-| `AppRadius.xxl` | 用于圆角 | 无此值 | **需要添加** |
-| Plus 按钮 | 有 | 无 | **不需要**，保持无 |
-| 图标 | `LucideIcons` | Material Icons | 保持 Material Icons |
-
-### 实现步骤
-
-#### 1. 添加 `AppRadius.xxl` 到 `design_tokens.dart`
-
-```dart
-class AppRadius {
-  static const double sm = 8;
-  static const double md = 12;
-  static const double lg = 16;
-  static const double xl = 20;
-  static const double xxl = 32;  // 新增
-  static const double full = 999;
-}
-```
-
-#### 2. 创建 `RecordingAnimation` widget
-
-放在 `apps/lib/shared/widgets/` 下，参考 social-app 的脉冲动画效果。
-
-#### 3. 修改 `MessageComposer`
-
-- 添加 `recordingAnimation` 参数（required）
-- 添加双层阴影
-- 使用 `AppRadius.xxl` 替代 `AppRadius.full`
-- 移除 plus 按钮（eryao 原有的无 plus 逻辑保持不变）
-- 保持 Material Icons
-
-#### 4. 修改 `FollowUpChatScreen`
-
-- 创建 `RecordingAnimation` 实例
-- 传入 `MessageComposer`
-
----
-
-## 相关文件
-
-- `apps/lib/features/divination/presentation/screens/follow_up_chat_screen.dart`
-- `apps/lib/shared/widgets/message_composer.dart`
-- `apps/lib/shared/widgets/recording_animation.dart`（新建）
-- `apps/lib/shared/theme/design_tokens.dart`
-- `/home/qzl/Code/social-app/apps/lib/shared/widgets/message_composer.dart`
-
-## 修复优先级
-
-1. **高优先级**：Bug 1（重复加载UI）
-2. **高优先级**：Bug 2 & 3（直接复用 social-app 输入框）
diff --git a/docs/bugs/2026-04-08-followup-sign-level-regeneration.md b/docs/bugs/2026-04-08-followup-sign-level-regeneration.md
deleted file mode 100644
index 99e1e05..0000000
--- a/docs/bugs/2026-04-08-followup-sign-level-regeneration.md
+++ /dev/null
@@ -1,200 +0,0 @@
-# Bug: 追问时 agent_output 被重新生成，导致 sign_level 被覆盖
-
-日期：2026-04-08
-状态：已确认根因（未修复）
-
-## 问题描述
-
-首次解卦完成后，用户继续追问时，agent 会重新生成 `agent_output`，重新计算卦的结论和标签。
-
-**具体表现**：
-- 首次解卦结论：`中下签`
-- 追问后结论：`下下签`（同一个卦，结果被重新生成）
-
-## 根因分析
-
-**问题定位**：`backend/src/core/agentscope/runtime/runner.py`
-
-### 根因链条
-
-1. **`runner.py:execute()` 方法（第 70-133 行）**
-   
-   无论 `runtime_mode` 是 `chat` 还是 `follow_up`，都会执行以下逻辑：
-
-   ```python
-   # 第 105-119 行：始终推导卦象
-   derived_divination = self._resolve_derived_divination(run_input=run_input)
-   await self._emit_step_event(
-       pipeline=pipeline,
-       run_input=run_input,
-       step_name="divination",
-       event_type="DIVINATION_DERIVED",  # <-- 追问时不应发射此事件
-       ...
-   )
-   ```
-
-2. **`runner.py:_execute_worker_step()` 方法（第 200-245 行）**
-   
-   始终将 `derived_divination` 传递给 worker：
-
-   ```python
-   # 第 294-302 行：始终将 divination_derived 放入 worker_output
-   await emitter.emit_final_text_end(
-       worker_output={
-           **worker_payload.model_dump(mode="json", exclude_none=True),
-           "divination_derived": derived_divination.model_dump(...),  # <-- 追问时不应包含
-       },
-       ...
-   )
-   ```
-
-3. **`stage_emitter.py:emit_final_text_end()` 方法（第 46-73 行）**
-   
-   始终将所有字段放入 `TEXT_MESSAGE_END` 事件：
-
-   ```python
-   payload = {
-       "messageId": message_id,
-       "role": "assistant",
-       "stage": self._stage,
-       "status": worker_output.get("status"),
-       "sign_level": worker_output.get("sign_level"),      # <-- 追问时不应有
-       "conclusion": worker_output.get("conclusion", []),   # <-- 追问时不应有
-       "focus_points": worker_output.get("focus_points", []),
-       "advice": worker_output.get("advice", []),
-       "keywords": worker_output.get("keywords", []),
-       "answer": worker_output.get("answer", ""),
-       "error": worker_output.get("error"),
-       "divination_derived": worker_output.get("divination_derived"),  # <-- 追问时不应有
-       ...
-   }
-   ```
-
-4. **`store.py:_persist_text_message()` 方法（第 125-160 行）**
-   
-   从事件中提取所有字段并完整存储：
-
-   ```python
-   worker_output_fields = (
-       "status",
-       "sign_level",         # <-- 追问时被重新生成并覆盖
-       "conclusion",         # <-- 追问时被重新生成并覆盖
-       "focus_points",
-       "advice",
-       "keywords",
-       "answer",
-       "error",
-       "divination_derived",  # <-- 追问时被重新生成
-       "ui_hints",
-   )
-   ```
-
-### 问题本质
-
-`runtime_mode=follow_up` 时，系统仍在：
-1. 重新推导卦象（调用 `_resolve_derived_divination`）
-2. 发射完整的 `DIVINATION_DERIVED` 事件
-3. 生成包含所有结构化字段的 `worker_output`
-4. 将所有字段存储到数据库
-
-但根据工程计划（`docs/plans/2026-04-08-followup-session-history-eng-plan.md:37-40`），追问时的预期行为是：
-
-```
-[一次追问]
-user -> /agent/runs(runtime_mode=follow_up)
-     -> assistant(content [+ optional metadata.agent_output.answer])
-```
-
-即：追问时只输出 `answer`（内容），不重新生成卦象结构。
-
-## 证据
-
-### 数据库证据
-
-Session `015fe0f9-0500-43ab-911a-4ce8e3160032`：
-
-| 时间 | 角色 | sign_level | divination_derived | 问题 |
-|------|------|------------|-------------------|------|
-| 05:21:19 | user | - | - | 首问问题 |
-| 05:21:28 | assistant | 中下签 | 完整 | 首答（正确） |
-| 05:22:24 | user | - | - | 追问 |
-| 05:22:33 | assistant | **下下签** | 完整 | 追问答（sign_level 被重新生成） |
-
-两个 assistant 消息的 `divination_derived` 完全相同，但 `sign_level` 不同，证明是重新生成的。
-
-## 修复方向
-
-### 1. `runner.py`
-
-在 `execute()` 方法中，根据 `runtime_mode` 决定是否推导卦象：
-
-```python
-async def execute(self, ...):
-    runtime_mode = self._resolve_runtime_mode(run_input=run_input)
-    
-    if runtime_mode == RuntimeMode.CHAT:
-        derived_divination = self._resolve_derived_divination(run_input=run_input)
-        await self._emit_step_event(...)  # DIVINATION_DERIVED
-    else:
-        derived_divination = None  # follow_up 不推导
-```
-
-### 2. `stage_emitter.py`
-
-`emit_final_text_end()` 根据 `runtime_mode` 决定发送哪些字段：
-
-```python
-async def emit_final_text_end(self, ..., runtime_mode: str):
-    payload = {"messageId": ..., "role": "assistant", "stage": self._stage}
-    
-    if runtime_mode == "chat":
-        payload.update({
-            "status": worker_output.get("status"),
-            "sign_level": worker_output.get("sign_level"),
-            "conclusion": worker_output.get("conclusion", []),
-            "focus_points": worker_output.get("focus_points", []),
-            "advice": worker_output.get("advice", []),
-            "keywords": worker_output.get("keywords", []),
-            "divination_derived": worker_output.get("divination_derived"),
-            ...
-        })
-    else:  # follow_up
-        payload["answer"] = worker_output.get("answer", "")
-```
-
-### 3. `store.py`
-
-`_persist_text_message()` 根据 `runtime_mode` 决定提取哪些字段：
-
-```python
-async def _persist_text_message(self, ...):
-    runtime_mode = self._resolve_runtime_mode(event=event)
-    
-    if runtime_mode == "chat":
-        worker_output_fields = ("status", "sign_level", "conclusion", ...)
-    else:  # follow_up
-        worker_output_fields = ("answer",)  # 只存储 answer
-```
-
-### 4. `runtime_models.py`
-
-`resolve_worker_output_model()` 应根据 `runtime_mode` 返回不同 schema：
-
-```python
-def resolve_worker_output_model(runtime_mode: RuntimeMode = RuntimeMode.CHAT) -> type[WorkerAgentOutputLite]:
-    if runtime_mode == RuntimeMode.FOLLOW_UP:
-        return WorkerAgentOutputLite  # 只有 answer
-    return AgentOutput  # 完整结构（继承自 WorkerAgentOutputRich）
-```
-
-## 相关文件
-
-- `backend/src/core/agentscope/runtime/runner.py` - 主编排逻辑
-- `backend/src/core/agentscope/runtime/stage_emitter.py` - 事件发射
-- `backend/src/core/agentscope/events/store.py` - 事件持久化
-- `backend/src/schemas/agent/runtime_models.py` - 输出 schema 定义
-
-## 相关文档
-
-- 工程计划：`docs/plans/2026-04-08-followup-session-history-eng-plan.md`
-- 协议文档：`docs/protocols/divination/divination-run-protocol.md`
diff --git a/docs/bugs/2026-04-08-home-history-only-shows-4-items.md b/docs/bugs/2026-04-08-home-history-only-shows-4-items.md
deleted file mode 100644
index a14986e..0000000
--- a/docs/bugs/2026-04-08-home-history-only-shows-4-items.md
+++ /dev/null
@@ -1,90 +0,0 @@
-# Bug: 首页历史 Session 只显示4条，"更多"按钮缺失
-
-日期：2026-04-08
-状态：功能缺失（未完成）
-
-## 问题描述
-
-前端主页接收后端传来的历史 session，永远只显示四个，"more"按钮不见了。
-
-## 根因分析
-
-### 1. 前端硬编码 `take(4)`
-
-`apps/lib/features/home/presentation/screens/home_screen.dart:287`：
-```dart
-children: historyItems.take(4).map((item) {
-```
-
-这是在 commit `6e82053`（重构首页为底部导航栏布局）时**有意添加**的设计选择，用于限制首页展示的历史记录数量。
-
-### 2. 前端未实现"更多"按钮
-
-- `l10n.more` 本地化字符串存在（`'更多'`/`'More'`），定义于 `apps/lib/l10n/app_localizations_zh.dart:115` 和 `app_localizations_en.dart:116`
-- 但搜索整个 Dart 代码库，`l10n.more` **没有任何地方使用它**
-- "更多"功能从未被实现
-
-### 3. 后端 `hasMore` 硬编码为 `False`
-
-`backend/src/v1/agent/service.py:655-659`：
-```python
-return HistorySnapshotResponse(
-    scope="history_sessions_latest_assistant",
-    threadId=None,
-    day=None,
-    hasMore=False,  # 硬编码，未实际计算
-    messages=messages,
-)
-```
-
-后端 schema 定义了 `hasMore` 字段（`schemas.py:238`），但 service 层返回时**硬编码为 `False`**，从未实际计算是否还有更多数据。
-
-### 4. 后端 API 行为正确
-
-`backend/src/v1/agent/service.py:641-646`：
-```python
-raw_messages = await self._repository.get_latest_assistant_messages_by_user_sessions(
-    user_id=str(current_user.id),
-    visibility_mask=bit_mask(bit=int(SystemVisibilityBit.UI_HISTORY)),
-    session_limit=50,  # 后端返回最多50条
-)
-```
-
-后端正确返回最多 50 条历史 session，前端只是没有利用这些数据。
-
-## 问题性质
-
-| 层级 | 现象 | 性质 |
-|------|------|------|
-| 后端 | `hasMore=False` 硬编码 | 缺陷：响应语义不正确 |
-| 前端 | `take(4)` 只显示4条 | 设计选择：有意的 UI 限制 |
-| 前端 | 无"更多"按钮 | 功能缺失：有 `l10n.more` 但未实现 |
-
-## 证据
-
-- 前端代码：`apps/lib/features/home/presentation/screens/home_screen.dart:287`
-- 后端代码：`backend/src/v1/agent/service.py:655`
-- 本地化字符串：`apps/lib/l10n/app_localizations_zh.dart:115`
-- 提交记录：`6e82053`（feat(home): 重构首页为底部导航栏布局）
-
-## 修复方向
-
-### 方案 A：实现完整分页（推荐）
-
-1. **后端**：实现真正的 `hasMore` 计算逻辑
-   - 添加 `offset` 参数支持分页
-   - 实际计算 `hasMore = total_count > offset + limit`
-
-2. **前端**：实现"更多"按钮或无限滚动
-   - 监听滚动位置，滚动到底部时加载更多
-   - 或添加"更多"按钮手动触发加载
-
-### 方案 B：移除不存在的字符串
-
-如果业务确定只需要显示4条，则：
-- 移除 `l10n.more` 本地化字符串，避免误导
-
-## 相关文档
-
-- 工程计划：`docs/plans/2026-04-05-divination-history-profile-eng-plan.md`
-- 随访计划：`docs/plans/2026-04-08-followup-session-history-eng-plan.md`
diff --git a/docs/plans/notification.md b/docs/plans/notification.md
new file mode 100644
index 0000000..865cc5e
--- /dev/null
+++ b/docs/plans/notification.md
@@ -0,0 +1,131 @@
+你是一个资深系统设计与代码分析助手。你的任务不是立刻编写代码，而是先深入理解当前项目中与“通知系统”相关的现有实现，然后基于现有代码结构输出一份可靠、可落地的实现方案。
+
+本次任务聚焦于 App 通知系统设计，重点包括但不限于：
+- 通知中心（notification list / inbox）
+- 用户通知存储
+- 已读 / 已看状态
+- 推送触达状态
+- 前台实时通知
+- 后台/离线系统推送
+- 新版本通知、活动通知等业务通知类型
+- Flutter 客户端、后端服务、Supabase 之间的协作方式
+
+你的首要目标是“理解现状并制定方案”，而不是直接进入编码。
+
+请严格遵循以下工作方式：
+
+1. 先理解现有代码，再做设计
+- 主动查找项目中与通知相关的现有代码、模块、接口、表结构、状态管理、服务封装和配置文件。
+- 特别关注以下内容：
+  - Flutter 端是否已有本地通知、消息中心、badge、页面入口、深链跳转
+  - 后端是否已有 notification / message / event / push / reminder 等相关模型、接口或 service
+  - Supabase 中是否已有相关表、RLS、Realtime、设备 token 存储
+  - 是否已有 APNs / FCM / flutter_local_notifications / Firebase Messaging / Supabase Realtime 等集成痕迹
+  - 是否已有版本检查机制、活动通知机制、用户收件箱机制
+- 不要假设项目是空白的。必须优先复用现有架构与已有能力。
+
+2. 基于现有架构设计，而不是脱离项目另起炉灶
+- 方案必须尽量贴合当前项目的技术栈、目录结构、分层方式、命名风格和已有约束。
+- 优先考虑如何在现有模块上扩展，而不是重新设计一整套无关架构。
+- 如果当前实现存在明显缺陷或冲突，可以指出问题，但仍要给出“在现有基础上渐进演进”的方案。
+
+3. 明确区分几个概念
+你在分析和设计时，必须区分以下概念，避免混淆：
+- 应用内通知记录
+- 系统推送通知
+- 前台实时同步
+- 本地通知
+- 已看状态
+- 已读状态
+- 推送是否成功
+- 用户是否真正查看
+
+4. 方案输出要覆盖的核心问题
+在最终方案中，至少要回答以下问题：
+- 现有代码里已经有什么，缺什么
+- 通知数据应该如何建模
+- 是否需要 notifications / notification_receipts / user_push_devices 等表
+- 已读、已看、点击、删除等状态如何设计
+- Flutter 端如何读取通知列表、显示未读数、更新已读状态
+- Supabase Realtime 在这个项目里适合承担什么职责
+- APNs / FCM 或其他推送通道应该如何接入
+- 后端应该如何组织通知写入、fanout、推送发送、状态回写
+- 新版本通知与活动通知如何落地
+- 如何保证权限安全，例如 RLS、用户只能访问自己的通知
+- 如何分阶段实施，避免一次性改动过大
+
+5. 输出必须先分析，后给建议
+不要一上来直接写“建议这样做”。
+你必须先给出：
+- 当前代码现状梳理
+- 已有能力
+- 缺失点
+- 架构约束
+然后再给出推荐方案。
+
+6. 不直接修改代码
+- 本轮目标是产出实现方案，而不是直接提交代码。
+- 除非我明确要求，否则不要直接创建文件、修改代码或生成迁移。
+- 可以提出建议的文件改动点，但不要直接实现。
+
+请按以下结构输出：
+
+# 1. 需求理解
+- 这次通知系统要解决的核心问题
+- 涉及的通知类型
+- 系统边界（Flutter / Backend / Supabase / Push Provider）
+
+# 2. 现有代码调研结果
+- 已发现的相关模块
+- 已有能力
+- 可复用部分
+- 当前缺口
+- 潜在冲突或风险
+
+# 3. 当前架构判断
+- 当前项目更适合采用什么通知架构
+- 为什么
+- 哪些方案不适合当前项目
+
+# 4. 推荐实现方案
+至少包括：
+- 数据模型设计
+- 状态字段设计
+- 客户端交互流程
+- 服务端处理流程
+- 实时通知与系统推送的职责划分
+- 已读/已看/触达状态方案
+- 版本通知与活动通知方案
+- 权限与安全策略
+
+# 5. 分阶段落地计划
+请拆分为多个阶段，例如：
+- 第一阶段：最小可用通知中心
+- 第二阶段：接入系统推送
+- 第三阶段：完善版本通知/活动通知/统计能力
+每个阶段说明：
+- 目标
+- 改动范围
+- 主要任务
+- 依赖项
+- 风险点
+- 验收标准
+
+# 6. 建议改动清单
+- 建议新增或修改的表
+- 建议新增或修改的后端模块
+- 建议新增或修改的 Flutter 模块
+- 建议新增的接口 / RPC / service
+- 建议新增的配置项
+
+# 7. 最终推荐
+- 推荐采用的总体方案
+- 推荐原因
+- 不确定点
+- 实施优先级排序
+
+额外要求：
+- 如果代码库中已经存在通知、提醒、消息、推送等相近实现，优先尝试整合，而不是重复建设。
+- 如果某些信息无法从当前代码中确认，要明确写出“不确定项”和“推断依据”。
+- 方案必须可执行、可渐进落地，避免空泛。
+- 优先给出最贴合当前代码库的设计，不要输出与项目现状脱节的理想化架构。
diff --git a/docs/plans/points-audit-and-register-bonus-plan.md b/docs/plans/points-audit-and-register-bonus-plan.md
new file mode 100644
index 0000000..0f8f2ca
--- /dev/null
+++ b/docs/plans/points-audit-and-register-bonus-plan.md
@@ -0,0 +1,419 @@
+# 积分审计与注册赠分策略改造计划（gstack / plan-eng-review）
+
+## 1. 目标与结论
+
+本计划解决三个问题：
+
+1. 用户删除账号后，积分与成本审计数据不能随业务数据一起丢失。
+2. 同邮箱重复注册时，不应再次拿到注册赠分。
+3. 积分消耗审计必须记录真实 `input_tokens` / `output_tokens` / `cost`，不能再写占位值。
+4. LLM 失败/取消时若平台已产生真实成本，该成本不转嫁用户积分，但必须进入审计账本。
+
+结论：采用 **双账本 + 资格账本**。
+
+- 保留业务账本：`user_points`、`points_ledger`（在线业务能力）
+- 新增审计账本：`points_audit_ledger`（不可变审计）
+- 新增资格账本：`register_bonus_claims`（注册奖励去重）
+- 注册赠分策略从 DB trigger 移出，改为应用层策略（配置驱动）
+
+---
+
+## 2. 系统边界
+
+### 2.1 业务域（可删除）
+
+- `user_points`：余额视图
+- `points_ledger`：业务流水
+- `messages` / `sessions`：会话与消息
+
+### 2.2 审计域（不可级联删除）
+
+- `points_audit_ledger`：审计流水，保留用户快照和成本快照（含用户承担/平台承担归属）
+- `register_bonus_claims`：注册奖励领取资格记录
+
+### 2.3 策略域（应用层）
+
+- `register_bonus_points` 配置项（默认 60）
+- `register_bonus_hmac_key` 配置项（环境变量注入）
+- 首登赠分是否发放由服务层决定，不写死在数据库 trigger
+
+---
+
+## 3. 现状问题（基于当前代码）
+
+1. 注册赠分写死在 DB trigger。  
+   当前函数：`public.initialize_profile_and_invite_code_on_signup()`，历史上出现过 100/60 改动漂移。
+
+2. 积分消费审计写占位值。  
+   在 `backend/src/v1/points/service.py` 中，`consume_successful_run_points` 写入 `input_tokens=0`、`output_tokens=0`、`cost=0`。
+
+3. 删号会丢审计线索。  
+   当前业务删除路径会清理业务数据，缺少独立审计账本保留策略。
+
+---
+
+## 4. 数据模型（按项目风格精简命名）
+
+说明：不引入陌生“模板字段”，沿用当前 `points_ledger` 命名风格。
+
+### 4.1 新表：`points_audit_ledger`
+
+- `id` UUID PK
+- `event_id` VARCHAR(64) UNIQUE NOT NULL
+- `user_id_snapshot` UUID NULL
+- `user_email_snapshot` TEXT NULL
+- `change_type` VARCHAR(16) NOT NULL
+- `biz_type` VARCHAR(16) NULL
+- `biz_id` UUID NULL
+- `direction` SMALLINT NOT NULL
+- `amount` BIGINT NOT NULL
+- `balance_after` BIGINT NOT NULL
+- `billed_to` VARCHAR(16) NOT NULL  -- `user` | `platform`
+- `run_id` VARCHAR(128) NULL
+- `request_id` VARCHAR(128) NULL
+- `input_tokens` INTEGER NOT NULL DEFAULT 0
+- `output_tokens` INTEGER NOT NULL DEFAULT 0
+- `cost` NUMERIC(12,6) NOT NULL DEFAULT 0
+- `metadata` JSONB NOT NULL DEFAULT '{}'
+- `created_at` TIMESTAMPTZ NOT NULL DEFAULT now()
+- `updated_at` TIMESTAMPTZ NOT NULL DEFAULT now()
+
+索引建议：
+
+- `uq_points_audit_ledger_event_id`
+- `ix_points_audit_ledger_user_id_created_at` (`user_id_snapshot`, `created_at DESC`)
+- `ix_points_audit_ledger_change_type_created_at` (`change_type`, `created_at DESC`)
+
+### 4.2 新表：`register_bonus_claims`
+
+- `id` UUID PK
+- `email_hash` VARCHAR(64) UNIQUE NOT NULL
+- `user_email_snapshot` TEXT NOT NULL
+- `first_user_id` UUID NULL
+- `grant_event_id` VARCHAR(64) UNIQUE NOT NULL
+- `created_at` TIMESTAMPTZ NOT NULL DEFAULT now()
+- `updated_at` TIMESTAMPTZ NOT NULL DEFAULT now()
+
+注：`email_hash` 由标准化邮箱（trim + lower）计算（HMAC-SHA256，key 来自 `register_bonus_hmac_key`）。
+
+---
+
+## 5. 数据流设计
+
+### 5.1 注册赠分流程（应用层，非 trigger）
+
+```text
+[用户首登/注册完成]
+  -> PointsPolicyService.load(register_bonus_points)
+  -> normalize(email) -> email_hash
+  -> INSERT register_bonus_claims(email_hash, ...)
+       - 成功: 继续发放积分
+       - 唯一冲突: 说明历史已领取，跳过发放
+  -> 更新 user_points
+  -> 写 points_ledger
+  -> 写 points_audit_ledger
+  -> commit
+```
+
+### 5.2 运行消耗积分流程（写真实成本）
+
+```text
+[run completed]
+  -> 从持久化消息/会话聚合真实 usage
+     (input_tokens, output_tokens, cost)
+  -> PointsService.consume_successful_run_points(...)
+  -> 更新 user_points
+  -> 写 points_ledger
+  -> 写 points_audit_ledger(真实 usage)
+  -> commit
+```
+
+### 5.3 运行失败/取消但平台发生成本流程（不扣用户，记平台账）
+
+```text
+[run failed/canceled]
+  -> 从持久化消息/事件聚合真实 usage
+  -> 若 cost > 0:
+       - 不调用用户扣分
+       - 写 points_audit_ledger(
+           direction=0,
+           amount=0,
+           billed_to='platform',
+           input_tokens/output_tokens/cost=真实值,
+           metadata.reason='run_failed_or_canceled_platform_billed'
+         )
+  -> commit
+```
+
+### 5.4 删除账号流程
+
+```text
+[delete account]
+  -> 删除 user_points / points_ledger / sessions / messages / profile / auth
+  -> 保留 points_audit_ledger / register_bonus_claims
+```
+
+---
+
+## 6. 失败模式与处理
+
+### 6.1 双写不一致（P0）
+
+- 场景：`points_ledger` 写成功，`points_audit_ledger` 写失败。
+- 策略：同事务写入，任一失败全部回滚。
+
+### 6.2 并发重复注册（P0）
+
+- 场景：同邮箱并发首登，发放多次。
+- 策略：`register_bonus_claims.email_hash` 唯一约束 + 冲突即跳过。
+
+### 6.3 邮箱规范化不一致（P1）
+
+- 场景：`User@A.com` 与 `user@a.com` 被当成不同人。
+- 策略：统一 normalize（trim + lower）后再 hash。
+
+### 6.4 成本快照缺失（P1）
+
+- 场景：run 成功但 usage 聚合取不到，写入 0。
+- 策略：
+  - 业务是否扣分与成本写入解耦：允许扣分，但审计需标记 `metadata.usage_missing=true`
+  - 记录 warning 日志并纳入告警指标
+
+### 6.5 失败/取消真实成本归属（P0）
+
+- 场景：LLM 回调失败或用户取消，但上游已计费。
+- 策略：
+  - 不扣用户积分（`user_points`、`points_ledger`不变）
+  - 审计账本强制落一条平台承担记录（`billed_to='platform'`）
+  - 该记录必须包含真实 `input_tokens` / `output_tokens` / `cost`
+
+---
+
+## 7. 信任边界与安全
+
+1. `user_email_snapshot` 必须来自服务端认证上下文，不接受客户端传入。
+2. `input_tokens/output_tokens/cost` 必须来自服务端持久化记录，不接受客户端上报。
+3. 审计表只允许后端 service-role 写入，不暴露客户端写接口。
+4. `register_bonus_claims` 不应被普通业务接口更新/删除。
+5. `register_bonus_hmac_key` 仅后端可读，不下发客户端，不写日志。
+
+---
+
+## 8. 实施步骤（最小改动优先）
+
+### Phase 1: 协议与配置
+
+- 更新协议文档：
+  - `docs/protocols/common/user-points-chat-data-protocol.md`
+  - 新增“审计留存与注册奖励策略”章节
+- 新增配置：`register_bonus_points`（默认 60）
+
+### Phase 2: 数据库迁移
+
+- 新增表：`points_audit_ledger`
+- 新增表：`register_bonus_claims`
+- 不改现有 `points_ledger`、`user_points` 结构
+
+### Phase 3: 服务层改造
+
+- 移除 trigger 中注册送分逻辑（trigger 只保留 profile/invite 初始化）
+- 在应用层增加注册奖励发放逻辑（带资格检查）
+- 在积分消费路径改造为真实 usage 写审计
+- 在失败/取消路径增加平台承担成本审计（不扣用户）
+
+### Phase 4: 删除链路校验
+
+- 删除账号后验证业务表清理
+- 验证审计表与资格表仍可查
+
+---
+
+## 9. 测试覆盖计划
+
+### 9.0 P0 测试门槛（实现前锁定）
+
+以下测试为上线前阻断项，任一缺失不得合并：
+
+1. **幂等回放**：同一 `event_id` 重放不重复写 `points_audit_ledger`。
+2. **注册送分去重**：同邮箱（normalize 后）重复注册不重复发放积分。
+3. **事务一致性**：业务账本写入成功但审计写入失败时，整体回滚。
+4. **删除后重注册**：删号后同邮箱重注册仍不再发放首登奖励。
+5. **失败/取消审计**：run 失败与取消场景写审计但不扣积分。
+6. **成本归属**：失败/取消且 `cost>0` 的记录必须为 `billed_to='platform'`。
+
+### 9.1 单元测试
+
+- 邮箱 normalize/hash 一致性
+- 注册奖励配置读取与默认值
+- usage 聚合函数（含空值和异常值）
+
+### 9.2 集成测试
+
+- 首次注册发放奖励成功
+- 同邮箱重复注册不再发放
+- 并发注册仅一次成功发放
+- 消费积分写入真实 tokens/cost 审计
+- 失败/取消且平台发生成本时，写平台承担审计且不扣用户积分
+- 删号后审计数据保留
+
+### 9.3 回归测试
+
+- 现有积分余额查询和扣分逻辑不回归
+- 邀请码流程不回归
+
+---
+
+## 10. 文件级改造清单
+
+### 数据库 / 模型
+
+- `backend/alembic/versions/*` 新增迁移：创建两张新表
+- `backend/src/models/points_audit_ledger.py` 新增
+- `backend/src/models/register_bonus_claims.py` 新增
+
+### 积分服务与仓储
+
+- `backend/src/v1/points/repository.py`：新增审计写入、资格检查方法
+- `backend/src/v1/points/service.py`：
+  - 新增注册奖励发放入口（配置驱动）
+  - 消费路径写真实 usage 审计
+  - 失败/取消路径写平台承担成本审计
+
+### 运行时调用链
+
+- `backend/src/core/agentscope/runtime/tasks.py`：
+  - 在扣分点传入真实 usage（或可计算上下文）
+  - 在 run 异常/取消路径传入 usage 并落平台承担审计
+
+### 协议文档
+
+- `docs/protocols/common/user-points-chat-data-protocol.md` 更新
+
+---
+
+## 11. 取舍说明
+
+### 为什么不直接改 `points_ledger` 为审计表
+
+- 会把在线业务与审计诉求耦合在一张表，后续权限和迁移风险高。
+- 当前最小改动方案是新增审计表，保持业务链路稳定。
+
+### 为什么保留 `event_id`
+
+- `id` 是技术主键，只保证行唯一。
+- `event_id` 是业务幂等键，防重放、防重试重复记账、支持跨表对账。
+
+---
+
+## 12. 未决事项
+
+1. `user_email_snapshot` 是否明文存储，还是仅内部可解密存储。
+2. 审计数据保留时长（默认建议至少 1 年）。
+3. 成本单位与精度是否统一沿用 `NUMERIC(12,6)`。
+
+---
+
+## 13. PR 拆分与执行顺序（可直接实现）
+
+### PR1：数据库与协议落地（不改业务行为）
+
+目标：先建立新数据边界，不改变线上积分逻辑。
+
+改动范围：
+
+- `backend/alembic/versions/*`：新增迁移，创建 `points_audit_ledger`、`register_bonus_claims`
+- `backend/src/models/points_audit_ledger.py`：新增模型
+- `backend/src/models/register_bonus_claims.py`：新增模型
+- `docs/protocols/common/user-points-chat-data-protocol.md`：补审计与注册送分策略契约
+
+验收标准：
+
+- 迁移可执行、可回滚
+- 新表索引与唯一约束生效
+- 协议文档与表结构一致
+
+测试要求：
+
+- 迁移 smoke test
+- 约束与索引存在性校验
+
+### PR2：注册送分策略迁移到应用层（去 trigger 固化）
+
+目标：把注册送分从 DB trigger 移到应用层唯一触发点（注册回调）。
+
+改动范围：
+
+- `backend/src/v1/points/service.py`：新增注册奖励发放入口与资格校验
+- `backend/src/v1/points/repository.py`：新增 `register_bonus_claims` 检查/写入
+- `backend/src/core/config/settings.py`（或等价配置入口）：新增 `register_bonus_points`
+- `backend/src/core/config/settings.py`（或等价配置入口）：新增 `register_bonus_hmac_key`
+- 相关注册回调调用链文件：接入 `grant_register_bonus_if_eligible(...)`
+- 迁移调整：更新 trigger，移除注册送分写入逻辑，仅保留 profile/invite 初始化
+
+验收标准：
+
+- 新注册触发一次赠分
+- 同邮箱重复注册不再赠分
+- 配置变更可控制赠分值（默认 60）
+- 邮箱哈希稳定且不可逆（同邮箱同哈希，不暴露明文）
+
+测试要求：
+
+- 并发注册去重测试（唯一约束 + 冲突路径）
+- 删除账号后同邮箱重注册不赠分
+- event_id 幂等回放不重复发放
+- 缺失 `register_bonus_hmac_key` 时服务启动失败（fail fast）
+
+### PR3：真实成本审计与删除链路联调
+
+目标：将 run 真实 usage 写入审计，并覆盖成功/失败/取消三种对话轮次；失败/取消场景发生真实成本时记平台承担。
+
+改动范围：
+
+- `backend/src/v1/points/service.py`：消费路径审计写入（真实 tokens/cost）
+- `backend/src/v1/points/repository.py`：新增 `append_audit_ledger(...)`
+- `backend/src/core/agentscope/runtime/tasks.py`：传递该轮次必要上下文
+- 账号删除服务链路：确认保留 `points_audit_ledger/register_bonus_claims`
+
+验收标准：
+
+- 成功对话：扣分 + 审计
+- 失败/取消对话：不扣分 + 审计（若有成本则 `billed_to='platform'`）
+- 审计中的 `input_tokens/output_tokens/cost` 为真实值，不再占位 0
+
+测试要求：
+
+- 成功/失败/取消三路径集成测试
+- 事务一致性测试（业务写成功 + 审计写失败 -> 回滚）
+- 删除后审计保留验证
+- 失败/取消 + `cost>0` 平台承担场景回归测试
+
+### PR4：观测与运维保障（建议同迭代完成）
+
+目标：避免审计静默失真。
+
+改动范围：
+
+- 指标与日志：
+  - `points_audit_write_failed_total`
+  - `points_usage_missing_total`
+- 告警阈值：连续失败或短时突增告警
+- 运维文档：异常重放与人工核对流程
+
+验收标准：
+
+- 审计写入失败可被监控发现
+- usage 缺失可被监控发现并可追溯到事件
+
+---
+
+## 14. 实施完成定义（DoD）
+
+满足以下全部条件才算完成：
+
+1. 计划中的 P0 测试门槛全部通过。
+2. 注册赠分不再依赖 DB trigger 写死值。
+3. `points_audit_ledger` 记录真实 usage，覆盖成功/失败/取消。
+3. `points_audit_ledger` 记录真实 usage，覆盖成功/失败/取消；失败/取消有真实成本时归属 `platform`。
+4. 删除账号后业务数据清理，审计与资格数据保留。
+5. 关键失败有指标与告警，不允许静默失败。
diff --git a/docs/protocols/common/http-error-codes.md b/docs/protocols/common/http-error-codes.md
index 48dc933..4035c2a 100644
--- a/docs/protocols/common/http-error-codes.md
+++ b/docs/protocols/common/http-error-codes.md
@@ -40,6 +40,7 @@ This document is the source of truth for backend RFC7807 `code` values consumed
 |---|---:|---|---|
 | `PROFILE_PAYLOAD_INVALID` | 422 | Profile update payload invalid (length/type/empty constraints) | Highlight invalid fields and block submit |
 | `PROFILE_NOT_FOUND` | 404 | User profile row missing | Show retry and optionally trigger profile bootstrap |
+| `PROFILE_DELETE_FAILED` | 502 | Backend failed to complete account hard deletion | Show delete-failed message and allow retry |
 
 ## Avatar
 
diff --git a/docs/protocols/profile/profile-protocol.md b/docs/protocols/profile/profile-protocol.md
index 80476ff..89f94de 100644
--- a/docs/protocols/profile/profile-protocol.md
+++ b/docs/protocols/profile/profile-protocol.md
@@ -1,6 +1,6 @@
 # Profile Protocol (Frontend <-> Backend)
 
-This document defines the canonical backend contract for user profile read/write and avatar upload signing.
+This document defines the canonical backend contract for user profile read/write, avatar upload signing, and account hard deletion.
 
 Protocol verification status:
 
@@ -9,7 +9,7 @@ Protocol verification status:
 - Backend service source: `backend/src/v1/users/service.py`
 - Frontend mapping source: `apps/lib/features/settings/data/apis/profile_api.dart`
 - Storage config source: `backend/src/core/config/settings.py`
-- Current status: aligned
+- Current status: profile/avatar aligned; account deletion backend implemented (frontend wiring pending)
 
 ## Compatibility strategy
 
@@ -23,6 +23,7 @@ Protocol verification status:
 - Update settings: `PATCH /api/v1/users/me/settings`
 - Create avatar upload url: `POST /api/v1/users/me/avatar/upload-url`
 - Upload avatar directly: `POST /api/v1/users/me/avatar` (multipart)
+- Delete account and personal data (hard delete): `DELETE /api/v1/users/me`
 
 ## Auth and trust boundary
 
@@ -179,3 +180,57 @@ Behavior:
 
 - All errors must follow RFC7807 `application/problem+json`.
 - `code` values must be registered in `docs/protocols/common/http-error-codes.md`.
+
+## Account hard deletion contract
+
+### `DELETE /api/v1/users/me`
+
+Purpose:
+
+- Permanently delete the current account and associated personal data from developer records.
+- This is hard delete behavior, not soft delete and not temporary deactivation.
+
+Request:
+
+- No request body.
+- Auth required (same JWT trust boundary as other `/users/me/*` routes).
+
+Success response:
+
+- `204 No Content`
+
+Behavior contract:
+
+1. Deletion target is always the authenticated user (`sub`), never a client-supplied `user_id`.
+2. Deletion must remove account identity and associated user data for this product scope.
+3. Deletion must be irreversible from client perspective.
+4. After successful deletion, existing local session must be treated as invalid by client and backend.
+
+### Deletion scope (current product contract)
+
+The delete operation must remove data owned by the authenticated user in the following domains:
+
+- Identity: `auth.users` row for current user.
+- Profile: `profiles` row.
+- Points: `user_points`, `points_ledger` rows linked to user.
+- Chat: `sessions`, `messages` rows linked to user/session ownership.
+- Avatar storage objects under prefix `avatars/{user_id}/`.
+
+Notes:
+
+- If future legal/compliance requirements introduce mandatory retention, retained fields must be explicitly documented and user-visible in deletion UI copy.
+- This protocol version assumes no regulated retention exemption for current product scope.
+
+### Error semantics
+
+The route follows common RFC7807 error payload and registry codes. Expected HTTP classes:
+
+- `401` when auth is missing/invalid.
+- `403` when auth context is valid but action is not permitted by policy.
+- `409` when server cannot complete deletion due to a conflict that requires user action.
+- `5xx` for unexpected server/upstream failure (must not fail silently).
+
+### Consistency and idempotency expectations
+
+- API behavior is request-idempotent at user intent level: once account is deleted, repeating the action should not recreate state and should not produce partial undeleted data.
+- Client should treat any post-deletion authenticated call failure as terminal session invalidation and force logout flow.