diff --git a/examples/crash_reporter/backend/README.md b/examples/crash_reporter/backend/README.md
index 466cbdc..a7bd08d 100644
--- a/examples/crash_reporter/backend/README.md
+++ b/examples/crash_reporter/backend/README.md
@@ -41,6 +41,32 @@ php -S 127.0.0.1:8080 -t public
 
 Open http://127.0.0.1:8080/ — login **admin** / **admin**.
 
+## RBAC (phase 1)
+
+Multi-tenant foundation (no admin UI yet):
+
+- **Global roles** on `users.role`: `root`, `platform_admin` (legacy `admin` works), `viewer`
+- **Companies** + **company_memberships** (`owner` / `admin` / `member`)
+- **Devices** auto-registered on upload; reports get `company_id` + `device_id`
+- Default company slug `default` — existing rows migrate on first request (`Database::ensureRbacSchema()`)
+
+Config (`config.php`):
+
+```php
+'rbac' => [
+    'default_company_slug' => 'default',
+    'default_company_id' => 1,
+],
+```
+
+Permission checks: `Rbac::can('edit_tags', $companyId)` (used by `Auth::canEditTags()`).  
+Manual SQL: `sql/migrations/001_rbac_companies.sql` (MariaDB). Re-login after deploy so session includes company memberships.
+
+## UI languages
+
+JSON catalogs under `public/assets/i18n/` (`en.json`, `ru.json`) — same key style as Android `strings.xml`.  
+Default: English. User choice is stored in `localStorage` (`crash_console_lang`). Language selector is in the reports toolbar next to **Theme**, and in the nav on other pages (login included).
+
 Upload test payload:
 
 ```bash
diff --git a/examples/crash_reporter/backend/config/config.example.php b/examples/crash_reporter/backend/config/config.example.php
index 853638a..9efd064 100644
--- a/examples/crash_reporter/backend/config/config.example.php
+++ b/examples/crash_reporter/backend/config/config.example.php
@@ -32,4 +32,9 @@ return [
     'session_name' => 'ac_crash_sess',
     // When true, upload API may include a short error hint (do not enable on public prod long-term)
     'debug' => false,
+    // Phase 1 RBAC: anonymous uploads and legacy rows attach to this company
+    'rbac' => [
+        'default_company_slug' => 'default',
+        'default_company_id' => 1,
+    ],
 ];
diff --git a/examples/crash_reporter/backend/data/test-rbac.sqlite b/examples/crash_reporter/backend/data/test-rbac.sqlite
new file mode 100644
index 0000000..0a4be1a
Binary files /dev/null and b/examples/crash_reporter/backend/data/test-rbac.sqlite differ
diff --git a/examples/crash_reporter/backend/public/api/report_tags.php b/examples/crash_reporter/backend/public/api/report_tags.php
index f012031..8862f1e 100644
--- a/examples/crash_reporter/backend/public/api/report_tags.php
+++ b/examples/crash_reporter/backend/public/api/report_tags.php
@@ -22,14 +22,10 @@ if ($method === 'GET') {
         'id' => $id,
         'tags' => $report['tags'] ?? [],
         'presets' => ReportRepository::listTagPresets(),
-        'can_edit' => Auth::canEditTags(),
+        'can_edit' => Auth::canEditTags((int) ($report['company_id'] ?? 0)),
     ]);
 }
 
-if (!Auth::canEditTags()) {
-    json_out(['ok' => false, 'error' => 'forbidden'], 403);
-}
-
 if ($method !== 'PUT' && $method !== 'POST') {
     json_out(['ok' => false, 'error' => 'method not allowed'], 405);
 }
@@ -54,6 +50,10 @@ if (!$report) {
     json_out(['ok' => false, 'error' => 'not found'], 404);
 }
 
+if (!Auth::canEditTags((int) ($report['company_id'] ?? 0))) {
+    json_out(['ok' => false, 'error' => 'forbidden'], 403);
+}
+
 try {
     ReportRepository::setCustomTags($id, $tagsIn);
     $updated = ReportRepository::getById($id);
diff --git a/examples/crash_reporter/backend/public/assets/css/app.css b/examples/crash_reporter/backend/public/assets/css/app.css
index 374deab..0e7e487 100644
--- a/examples/crash_reporter/backend/public/assets/css/app.css
+++ b/examples/crash_reporter/backend/public/assets/css/app.css
@@ -435,6 +435,20 @@ a:hover { text-decoration: underline; }
 .stack { background: var(--surface2); padding: 16px; border-radius: 8px; overflow-x: auto; font-size: 13px; line-height: 1.5; }
 .reports-toolbar .toolbar-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
 .toolbar-select { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
+.nav-locale {
+  padding: 10px 12px 6px;
+  border-top: 1px solid var(--border);
+}
+.nav-locale--toolbar-dup { display: none; }
+.toolbar-select--nav { width: 100%; }
+.toolbar-select--nav select { flex: 1; min-width: 0; }
+.login-locale {
+  position: fixed;
+  top: 12px;
+  right: 12px;
+  z-index: 5;
+}
+.login-page .login-card { margin-top: 2.5rem; }
 .toolbar-select select {
   padding: 6px 8px;
   border-radius: 6px;
@@ -683,16 +697,32 @@ a:hover { text-decoration: underline; }
 .detail-filter-link--tag {
   display: inline-block;
   padding: 2px 8px;
+  margin: 0;
   border-radius: 999px;
-  background: var(--surface2);
-  border: 1px solid var(--border);
-  font-size: 12px;
+  border: none;
+  font-size: 11px;
   font-weight: 600;
+  line-height: 1.4;
+  color: #fff;
+  background: var(--tag-bg, #5c6b82);
 }
-.detail-filter-link--tag:hover {
-  border-color: var(--accent);
+.detail-filter-link--tag:hover,
+.detail-filter-link--tag:focus-visible {
+  color: #fff;
+  background: var(--tag-bg, #5c6b82);
+  filter: brightness(1.12);
+  outline: none;
+}
+.detail-abi-row,
+.detail-meta-row {
+  line-height: 1.8;
+}
+.detail-meta-row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 6px;
 }
-.detail-abi-row { line-height: 1.8; }
 
 .exc { color: var(--danger); font-weight: 600; }
 .cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 20px 0; }
diff --git a/examples/crash_reporter/backend/public/assets/i18n/en.json b/examples/crash_reporter/backend/public/assets/i18n/en.json
new file mode 100644
index 0000000..a86b333
--- /dev/null
+++ b/examples/crash_reporter/backend/public/assets/i18n/en.json
@@ -0,0 +1,116 @@
+{
+  "app_name": "Android Cast Crashes",
+  "nav.home": "Home",
+  "nav.reports": "Reports",
+  "nav.logout": "Logout",
+  "nav.toggle": "Navigation",
+  "theme.label": "Theme",
+  "theme.dark": "Dark",
+  "theme.light": "Light",
+  "lang.label": "Language",
+  "lang.en": "English",
+  "lang.ru": "Russian",
+  "home.title": "Crash console",
+  "home.intro": "Anonymous Android Cast crash ingest is active. Use Reports to analyze grouped fingerprints.",
+  "home.upload_api": "Upload API:",
+  "home.schema": "Schema:",
+  "reports.title": "Crash reports",
+  "reports.by_time": "By time",
+  "reports.grouped": "Grouped",
+  "reports.per_page": "Per page",
+  "reports.search": "Search",
+  "reports.search_placeholder": "Keywords (exceptions, devices, stack traces…)",
+  "reports.clear": "Clear",
+  "reports.loading": "Loading…",
+  "reports.empty": "No reports yet.",
+  "reports.status_showing": "Showing {from}–{to} of {total}",
+  "reports.invalid_response": "Invalid response",
+  "reports.load_failed": "Load failed",
+  "reports.network_error": "Network error",
+  "reports.mode_disabled_filter": "Disabled while a filter is active",
+  "filter.banner_similar": "Similar reports for #{id}",
+  "filter.banner_device": "Device: “{value}”",
+  "filter.banner_abi": "ABI: {value}",
+  "filter.banner_sdk": "SDK {value}",
+  "filter.banner_os": "Android {value}",
+  "filter.banner_app": "App {value}",
+  "filter.banner_build": "Build {value}",
+  "filter.banner_search": "Search: “{value}”",
+  "filter.clear": "Clear filters",
+  "pagination.previous": "← Previous",
+  "pagination.next": "Next →",
+  "pagination.previous_range": "← Previous ({before}/{through})",
+  "pagination.next_range": "Next ({start}/{end}) →",
+  "col.device": "Device",
+  "col.app": "App",
+  "col.os": "OS",
+  "col.os_ver": "OS ver",
+  "col.received": "Received",
+  "col.rating": "Rating",
+  "col.count": "Count",
+  "col.fingerprint": "Fingerprint",
+  "col.type": "Type",
+  "col.last_generated": "Last generated",
+  "col.last_received": "Last received",
+  "col.tags": "Tags",
+  "col.expand": "Expand",
+  "col.drag": "Drag column",
+  "col.drag_reorder": "Drag column to reorder",
+  "row.show_summary": "Show summary",
+  "row.open_report": "Click to open full report",
+  "row.edit_tags": "Edit tags",
+  "tag.new": "new",
+  "tag.java": "Java",
+  "tag.ndk": "NDK",
+  "tag.android": "Android",
+  "tag.edit_title": "Edit tags",
+  "tag.close": "Close",
+  "tag.label": "Label",
+  "tag.color": "Color",
+  "tag.add": "Add",
+  "tag.add_tag": "Add tag",
+  "tag.save": "Save",
+  "tag.save_tags": "Save tags",
+  "tag.suggestions": "Suggestions:",
+  "tag.placeholder": "e.g. regression",
+  "tag.hint_auto": "Auto tags (NDK / Java / Android / new) appear in the list. Add custom labels below.",
+  "tag.hint_admin": "Sign in as admin to edit custom tags.",
+  "tag.none_custom": "No custom tags yet.",
+  "tag.none_preview": "No custom tags",
+  "tag.remove": "Remove tag",
+  "tag.saving": "Saving…",
+  "tag.saved": "Saved",
+  "tag.save_failed": "Save failed",
+  "detail.back": "Back to list",
+  "detail.title": "Crash report",
+  "detail.report_meta": "Report {id} · {type}",
+  "detail.tags": "Tags",
+  "detail.device": "Device",
+  "detail.app": "App",
+  "detail.timing": "Timing",
+  "detail.abis": "ABIs:",
+  "detail.build": "Build:",
+  "detail.generated": "Generated:",
+  "detail.received": "Received:",
+  "detail.fingerprint": "Fingerprint:",
+  "detail.filter_device": "Show reports for similar devices",
+  "detail.filter_os": "Show reports on this OS",
+  "detail.filter_version": "Show reports for this app version",
+  "detail.filter_build": "Show reports from this build",
+  "detail.java_exception": "Java exception",
+  "detail.native_crash": "Native crash",
+  "detail.find_similar": "Find similar reports",
+  "detail.thread": "Thread:",
+  "detail.signal": "Signal:",
+  "detail.session_context": "Session context (crash)",
+  "detail.raw_json": "Raw JSON",
+  "login.sign_in_hint": "Sign in to view anonymous crash reports",
+  "login.username": "Username",
+  "login.password": "Password",
+  "login.submit": "Sign in",
+  "login.hint_default": "Default: admin / admin",
+  "login.register": "Register",
+  "login.register_soon": "(coming soon)",
+  "login.error": "Invalid credentials",
+  "footer.copyright": "(c) Anton Afanaasyeu, {year}"
+}
diff --git a/examples/crash_reporter/backend/public/assets/i18n/ru.json b/examples/crash_reporter/backend/public/assets/i18n/ru.json
new file mode 100644
index 0000000..6afc935
--- /dev/null
+++ b/examples/crash_reporter/backend/public/assets/i18n/ru.json
@@ -0,0 +1,115 @@
+{
+  "app_name": "Сбои Android Cast",
+  "nav.home": "Главная",
+  "nav.reports": "Отчёты",
+  "nav.logout": "Выход",
+  "nav.toggle": "Навигация",
+  "theme.label": "Тема",
+  "theme.dark": "Тёмная",
+  "theme.light": "Светлая",
+  "lang.label": "Язык",
+  "lang.en": "English",
+  "lang.ru": "Русский",
+  "home.title": "Консоль сбоев",
+  "home.intro": "Приём анонимных отчётов Android Cast активен. Откройте «Отчёты» для анализа сгруппированных отпечатков.",
+  "home.upload_api": "API загрузки:",
+  "home.schema": "Схема:",
+  "reports.title": "Отчёты о сбоях",
+  "reports.by_time": "По времени",
+  "reports.grouped": "Группы",
+  "reports.per_page": "На странице",
+  "reports.search": "Поиск",
+  "reports.search_placeholder": "Ключевые слова (исключения, устройства, стеки…)",
+  "reports.clear": "Очистить",
+  "reports.loading": "Загрузка…",
+  "reports.empty": "Отчётов пока нет.",
+  "reports.status_showing": "Показано {from}–{to} из {total}",
+  "reports.invalid_response": "Некорректный ответ",
+  "reports.load_failed": "Ошибка загрузки",
+  "reports.network_error": "Сетевая ошибка",
+  "reports.mode_disabled_filter": "Недоступно при активном фильтре",
+  "filter.banner_similar": "Похожие отчёты для №{id}",
+  "filter.banner_device": "Устройство: «{value}»",
+  "filter.banner_abi": "ABI: {value}",
+  "filter.banner_sdk": "SDK {value}",
+  "filter.banner_os": "Android {value}",
+  "filter.banner_app": "Приложение {value}",
+  "filter.banner_build": "Сборка {value}",
+  "filter.banner_search": "Поиск: «{value}»",
+  "filter.clear": "Сбросить фильтры",
+  "pagination.previous": "← Назад",
+  "pagination.next": "Вперёд →",
+  "pagination.previous_range": "← Назад ({before}/{through})",
+  "pagination.next_range": "Вперёд ({start}/{end}) →",
+  "col.device": "Устройство",
+  "col.app": "Приложение",
+  "col.os": "ОС",
+  "col.os_ver": "Версия ОС",
+  "col.received": "Получен",
+  "col.rating": "Рейтинг",
+  "col.count": "Кол-во",
+  "col.fingerprint": "Отпечаток",
+  "col.type": "Тип",
+  "col.last_generated": "Создан",
+  "col.last_received": "Получен",
+  "col.tags": "Метки",
+  "col.expand": "Развернуть",
+  "col.drag": "Перетащить столбец",
+  "col.drag_reorder": "Перетащите для смены порядка столбцов",
+  "row.show_summary": "Показать сводку",
+  "row.open_report": "Нажмите, чтобы открыть полный отчёт",
+  "row.edit_tags": "Редактировать метки",
+  "tag.new": "новый",
+  "tag.java": "Java",
+  "tag.ndk": "NDK",
+  "tag.android": "Android",
+  "tag.edit_title": "Редактирование меток",
+  "tag.close": "Закрыть",
+  "tag.label": "Название",
+  "tag.color": "Цвет",
+  "tag.add": "Добавить",
+  "tag.add_tag": "Добавить метку",
+  "tag.save": "Сохранить",
+  "tag.save_tags": "Сохранить метки",
+  "tag.suggestions": "Подсказки:",
+  "tag.hint_auto": "Автометки (NDK / Java / Android / новый) в списке. Ниже можно добавить свои.",
+  "tag.hint_admin": "Войдите как администратор, чтобы редактировать метки.",
+  "tag.none_custom": "Пользовательских меток пока нет.",
+  "tag.none_preview": "Нет пользовательских меток",
+  "tag.remove": "Удалить метку",
+  "tag.saving": "Сохранение…",
+  "tag.saved": "Сохранено",
+  "tag.save_failed": "Не удалось сохранить",
+  "detail.back": "К списку",
+  "detail.title": "Отчёт о сбое",
+  "detail.report_meta": "Отчёт {id} · {type}",
+  "detail.tags": "Метки",
+  "detail.device": "Устройство",
+  "detail.app": "Приложение",
+  "detail.timing": "Время",
+  "detail.abis": "ABI:",
+  "detail.build": "Сборка:",
+  "detail.generated": "Создан:",
+  "detail.received": "Получен:",
+  "detail.fingerprint": "Отпечаток:",
+  "detail.filter_device": "Показать отчёты для похожих устройств",
+  "detail.filter_os": "Показать отчёты с этой ОС",
+  "detail.filter_version": "Показать отчёты для этой версии приложения",
+  "detail.filter_build": "Показать отчёты этой сборки",
+  "detail.java_exception": "Исключение Java",
+  "detail.native_crash": "Нативный сбой",
+  "detail.find_similar": "Найти похожие отчёты",
+  "detail.thread": "Поток:",
+  "detail.signal": "Сигнал:",
+  "detail.session_context": "Контекст сессии (сбой)",
+  "detail.raw_json": "Исходный JSON",
+  "login.sign_in_hint": "Войдите для просмотра анонимных отчётов о сбоях",
+  "login.username": "Имя пользователя",
+  "login.password": "Пароль",
+  "login.submit": "Войти",
+  "login.hint_default": "По умолчанию: admin / admin",
+  "login.register": "Регистрация",
+  "login.register_soon": "(скоро)",
+  "login.error": "Неверные учётные данные",
+  "footer.copyright": "(c) Anton Afanaasyeu, {year}"
+}
diff --git a/examples/crash_reporter/backend/public/assets/js/app.js b/examples/crash_reporter/backend/public/assets/js/app.js
index 0a999d0..34568e7 100644
--- a/examples/crash_reporter/backend/public/assets/js/app.js
+++ b/examples/crash_reporter/backend/public/assets/js/app.js
@@ -1,4 +1,8 @@
 (function () {
+  function t(key, params) {
+    return window.CrashI18n ? window.CrashI18n.t(key, params) : key;
+  }
+
   const STORAGE = {
     theme: 'crash_console_theme',
     perPage: 'crash_console_per_page',
@@ -21,20 +25,17 @@
     tags: 128,
   };
 
-  const TAG_NEW = { label: 'new', bg: '#3d8bfd' };
-  const CRASH_KIND_TAGS = {
-    native: { label: 'NDK', bg: '#b45309' },
-    java: { label: 'Java', bg: '#6d28d9' },
-    android: { label: 'Android', bg: '#047857' },
-  };
+  function tagNew() {
+    return { label: t('tag.new'), bg: '#3d8bfd' };
+  }
 
   const LIST_COLUMNS = [
-    { key: 'device_model', label: 'Device' },
-    { key: 'app_version', label: 'App' },
-    { key: 'os_name', label: 'OS' },
-    { key: 'os_version', label: 'OS ver' },
-    { key: 'received_at_ms', label: 'Received', fmt: 'time' },
-    { key: 'rating', label: 'Rating', fmt: 'stars' },
+    { key: 'device_model', labelKey: 'col.device' },
+    { key: 'app_version', labelKey: 'col.app' },
+    { key: 'os_name', labelKey: 'col.os' },
+    { key: 'os_version', labelKey: 'col.os_ver' },
+    { key: 'received_at_ms', labelKey: 'col.received', fmt: 'time' },
+    { key: 'rating', labelKey: 'col.rating', fmt: 'stars' },
   ];
 
   const SORT_API_MAP = {
@@ -45,14 +46,19 @@
   };
 
   const GROUP_COLUMNS = [
-    { key: 'cnt', label: 'Count' },
-    { key: 'rating', label: 'Rating', fmt: 'stars' },
-    { key: 'fingerprint', label: 'Fingerprint', fmt: 'fp' },
-    { key: 'crash_type', label: 'Type' },
-    { key: 'last_generated_ms', label: 'Last generated', fmt: 'time' },
-    { key: 'last_received_ms', label: 'Last received', fmt: 'time' },
+    { key: 'cnt', labelKey: 'col.count' },
+    { key: 'rating', labelKey: 'col.rating', fmt: 'stars' },
+    { key: 'fingerprint', labelKey: 'col.fingerprint', fmt: 'fp' },
+    { key: 'crash_type', labelKey: 'col.type' },
+    { key: 'last_generated_ms', labelKey: 'col.last_generated', fmt: 'time' },
+    { key: 'last_received_ms', labelKey: 'col.last_received', fmt: 'time' },
   ];
 
+  function colLabel(col) {
+    if (!col) return '';
+    return t(col.labelKey || 'col.' + col.key);
+  }
+
   function basePath() {
     return document.body.getAttribute('data-base-path') || '';
   }
@@ -207,8 +213,15 @@
   }
 
   function crashKindTag(crashType) {
-    const t = String(crashType || '').toLowerCase();
-    return CRASH_KIND_TAGS[t] || { label: t || '?', bg: '#5c6b82' };
+    const kind = String(crashType || '').toLowerCase();
+    const map = {
+      native: { labelKey: 'tag.ndk', bg: '#b45309' },
+      java: { labelKey: 'tag.java', bg: '#6d28d9' },
+      android: { labelKey: 'tag.android', bg: '#047857' },
+    };
+    const hit = map[kind];
+    if (hit) return { label: t(hit.labelKey), bg: hit.bg };
+    return { label: kind || '?', bg: '#5c6b82' };
   }
 
   function renderTagPills(tags) {
@@ -233,7 +246,7 @@
       const viewed = row.viewed || getViewedIds().has(Number(row.id));
       const sinceVisit = Number(row.received_at_ms) > lastVisitMs();
       if (!viewed && (lastVisitMs() === 0 || sinceVisit)) {
-        tags.push(TAG_NEW);
+        tags.push(tagNew());
       }
     }
     if (Array.isArray(row.tags)) {
@@ -333,7 +346,11 @@
 
   function columnLabelByKey(key) {
     const c = LIST_COLUMNS.find((col) => col.key === key);
-    return c ? c.label : key;
+    if (c) return colLabel(c);
+    const g = GROUP_COLUMNS.find((col) => col.key === key);
+    if (g) return colLabel(g);
+    if (key === 'tags') return t('col.tags');
+    return key;
   }
 
   function clearColumnDropMarkers(thead) {
@@ -708,7 +725,9 @@
           thDragAttrs =
             ' draggable="true" data-col-key="' +
             escapeHtml(c.key) +
-            '" title="Drag column to reorder"';
+            '" title="' +
+            escapeHtml(t('col.drag_reorder')) +
+            '"';
         }
         html +=
           '<th class="' +
@@ -722,9 +741,11 @@
           ' scope="col"><span class="th-inner">' +
           (grouped
             ? ''
-            : '<span class="th-drag" aria-hidden="true" title="Drag column">⋮⋮</span>') +
+            : '<span class="th-drag" aria-hidden="true" title="' +
+              escapeHtml(t('col.drag')) +
+              '">⋮⋮</span>') +
           '<span class="th-label">' +
-          escapeHtml(c.label) +
+          escapeHtml(colLabel(c)) +
           '</span> <span class="sort-ind" aria-hidden="true">' +
           arrow +
           '</span></span>' +
@@ -820,7 +841,9 @@
         tbody.innerHTML =
           '<tr><td colspan="' +
           colspan() +
-          '" class="muted">No reports yet.</td></tr>';
+          '" class="muted">' +
+          escapeHtml(t('reports.empty')) +
+          '</td></tr>';
         return;
       }
       let html = '';
@@ -838,7 +861,9 @@
         html +=
           '<td class="report-tree-cell"><button type="button" class="report-tree-toggle" aria-expanded="false" aria-controls="' +
           briefId +
-          '" title="Show summary"><span class="report-tree-arrow" aria-hidden="true"></span></button></td>';
+          '" title="' +
+          escapeHtml(t('row.show_summary')) +
+          '"><span class="report-tree-arrow" aria-hidden="true"></span></button></td>';
         cols.forEach((c) => {
           if (c.key === 'cnt') {
             html += '<td><span class="badge">' + escapeHtml(row.cnt) + '</span></td>';
@@ -890,7 +915,7 @@
     function load() {
       if (loading) return;
       loading = true;
-      statusEl.textContent = 'Loading…';
+      statusEl.textContent = t('reports.loading');
       let qs =
         'page=' +
         page +
@@ -1129,7 +1154,7 @@
       html +=
         '<button type="button" class="tag-remove" data-remove-id="' +
         escapeHtml(tag.id) +
-        '" aria-label="Remove tag">×</button>';
+        '" aria-label="' + escapeHtml(t('tag.remove')) + '">×</button>';
     }
     return html + '</span>';
   }
@@ -1249,7 +1274,7 @@
 
     if (els.saveBtn) {
       els.saveBtn.addEventListener('click', () => {
-        setStatus('Saving…', true);
+        setStatus(t('tag.saving'), true);
         const xhr = new XMLHttpRequest();
         xhr.open('POST', basePath() + '/api/report_tags.php', true);
         xhr.setRequestHeader('Content-Type', 'application/json');
@@ -1271,7 +1296,7 @@
           if (cfg.onSaved) cfg.onSaved(state.tags, state.reportId);
         };
         xhr.onerror = function () {
-          setStatus('Network error', false);
+          setStatus(t('reports.network_error'), false);
         };
         xhr.send(JSON.stringify({ id: state.reportId, tags: state.tags }));
       });
@@ -1418,12 +1443,29 @@
     });
   }
 
-  document.addEventListener('DOMContentLoaded', () => {
+  function boot() {
     initTheme();
     initNav();
     initTagModal();
     initReportDetail();
     initTagEditorDetail();
     initReportsApp();
-  });
+  }
+
+  function onReady(fn) {
+    const run = () => {
+      if (window.CrashI18n && window.CrashI18n.ready) {
+        window.CrashI18n.ready.then(fn);
+      } else {
+        fn();
+      }
+    };
+    if (document.readyState === 'loading') {
+      document.addEventListener('DOMContentLoaded', run);
+    } else {
+      run();
+    }
+  }
+
+  onReady(boot);
 })();
diff --git a/examples/crash_reporter/backend/public/assets/js/i18n.js b/examples/crash_reporter/backend/public/assets/js/i18n.js
new file mode 100644
index 0000000..252c1e4
--- /dev/null
+++ b/examples/crash_reporter/backend/public/assets/js/i18n.js
@@ -0,0 +1,168 @@
+/**
+ * Crash console i18n — JSON catalogs (en default), same key style as Android strings.xml.
+ */
+(function (global) {
+  const STORAGE_KEY = 'crash_console_lang';
+  const SUPPORTED = ['en', 'ru'];
+  const DEFAULT_LANG = 'en';
+
+  let lang = DEFAULT_LANG;
+  let catalog = {};
+  let fallback = {};
+  let readyResolve;
+  const ready = new Promise((resolve) => {
+    readyResolve = resolve;
+  });
+
+  function basePath() {
+    const body = document.body;
+    return body ? body.getAttribute('data-base-path') || '' : '';
+  }
+
+  function storedLang() {
+    try {
+      const v = localStorage.getItem(STORAGE_KEY);
+      return SUPPORTED.includes(v) ? v : DEFAULT_LANG;
+    } catch {
+      return DEFAULT_LANG;
+    }
+  }
+
+  function persistLang(code) {
+    try {
+      localStorage.setItem(STORAGE_KEY, code);
+    } catch { /* ignore */ }
+  }
+
+  function fetchCatalog(code) {
+    const url = basePath() + '/assets/i18n/' + encodeURIComponent(code) + '.json';
+    return fetch(url, { credentials: 'same-origin' }).then((res) => {
+      if (!res.ok) throw new Error('i18n load failed: ' + code);
+      return res.json();
+    });
+  }
+
+  /**
+   * @param {string} key
+   * @param {Record<string, string|number>|undefined} params
+   */
+  function t(key, params) {
+    let s = catalog[key] ?? fallback[key] ?? key;
+    if (params) {
+      Object.keys(params).forEach((k) => {
+        s = s.split('{' + k + '}').join(String(params[k]));
+      });
+    }
+    return s;
+  }
+
+  function apply(root) {
+    const scope = root || document;
+    scope.querySelectorAll('[data-i18n]').forEach((el) => {
+      const key = el.getAttribute('data-i18n');
+      if (!key) return;
+      if (el.hasAttribute('data-i18n-html')) {
+        el.innerHTML = t(key);
+      } else {
+        el.textContent = t(key);
+      }
+    });
+    scope.querySelectorAll('[data-i18n-placeholder]').forEach((el) => {
+      const key = el.getAttribute('data-i18n-placeholder');
+      if (key) el.setAttribute('placeholder', t(key));
+    });
+    scope.querySelectorAll('[data-i18n-title]').forEach((el) => {
+      const key = el.getAttribute('data-i18n-title');
+      if (key) el.setAttribute('title', t(key));
+    });
+    scope.querySelectorAll('[data-i18n-aria]').forEach((el) => {
+      const key = el.getAttribute('data-i18n-aria');
+      if (key) el.setAttribute('aria-label', t(key));
+    });
+    scope.querySelectorAll('select[data-i18n-options]').forEach((sel) => {
+      const prefix = sel.getAttribute('data-i18n-options');
+      if (!prefix) return;
+      sel.querySelectorAll('option[data-i18n]').forEach((opt) => {
+        const k = opt.getAttribute('data-i18n');
+        if (k) opt.textContent = t(k);
+      });
+    });
+    const footer = document.querySelector('[data-i18n="footer.copyright"]');
+    if (footer) {
+      const year = footer.getAttribute('data-year') || String(new Date().getFullYear());
+      footer.textContent = t('footer.copyright', { year });
+    }
+    scope.querySelectorAll('[data-i18n="detail.report_meta"]').forEach((el) => {
+      el.textContent = t('detail.report_meta', {
+        id: el.getAttribute('data-i18n-id') || '',
+        type: el.getAttribute('data-i18n-type') || '',
+      });
+    });
+  }
+
+  function syncLangSelect() {
+    document.querySelectorAll('.lang-select').forEach((sel) => {
+      if (sel.value !== lang) sel.value = lang;
+    });
+  }
+
+  async function setLang(code, options) {
+    const opts = options || {};
+    if (!SUPPORTED.includes(code)) code = DEFAULT_LANG;
+    fallback = await fetchCatalog(DEFAULT_LANG);
+    catalog = code === DEFAULT_LANG ? { ...fallback } : await fetchCatalog(code);
+    lang = code;
+    document.documentElement.setAttribute('lang', code);
+    persistLang(code);
+    syncLangSelect();
+    if (!opts.silent) {
+      apply(document);
+      document.dispatchEvent(new CustomEvent('crash-i18n-change', { detail: { lang: code } }));
+    }
+  }
+
+  function getLang() {
+    return lang;
+  }
+
+  function initLangSelect() {
+    document.querySelectorAll('.lang-select').forEach((sel) => {
+      sel.value = lang;
+      if (sel.dataset.i18nBound === '1') return;
+      sel.dataset.i18nBound = '1';
+      sel.addEventListener('change', () => {
+        setLang(sel.value).catch(() => setLang(DEFAULT_LANG));
+      });
+    });
+  }
+
+  async function init() {
+    lang = storedLang();
+    document.documentElement.setAttribute('lang', lang);
+    await setLang(lang, { silent: true });
+    apply(document);
+    initLangSelect();
+    readyResolve();
+  }
+
+  global.CrashI18n = {
+    t,
+    apply,
+    setLang,
+    getLang,
+    init,
+    ready,
+    SUPPORTED,
+  };
+
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', () => {
+      init().catch(() => {
+        lang = DEFAULT_LANG;
+        readyResolve();
+      });
+    });
+  } else {
+    init().catch(() => readyResolve());
+  }
+})(typeof window !== 'undefined' ? window : globalThis);
diff --git a/examples/crash_reporter/backend/sql/migrations/001_rbac_companies.sql b/examples/crash_reporter/backend/sql/migrations/001_rbac_companies.sql
new file mode 100644
index 0000000..fcf2acb
--- /dev/null
+++ b/examples/crash_reporter/backend/sql/migrations/001_rbac_companies.sql
@@ -0,0 +1,46 @@
+-- Phase 1: companies, memberships, devices, report scoping.
+-- Idempotent on fresh DB; existing installs: prefer app auto-migration (Database::ensureRbacSchema).
+-- Manual run: mysql -u root -p androidcast_crashes < sql/migrations/001_rbac_companies.sql
+
+USE androidcast_crashes;
+
+CREATE TABLE IF NOT EXISTS companies (
+    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    slug VARCHAR(64) NOT NULL,
+    name VARCHAR(128) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE KEY uq_companies_slug (slug)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS company_memberships (
+    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    user_id INT UNSIGNED NOT NULL,
+    company_id INT UNSIGNED NOT NULL,
+    role ENUM('owner', 'admin', 'member') NOT NULL DEFAULT 'member',
+    permissions_json LONGTEXT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE KEY uq_membership_user_company (user_id, company_id),
+    KEY idx_membership_company (company_id),
+    CONSTRAINT fk_membership_user FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE,
+    CONSTRAINT fk_membership_company FOREIGN KEY (company_id) REFERENCES companies (id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS devices (
+    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    company_id INT UNSIGNED NOT NULL,
+    external_id VARCHAR(128) NOT NULL,
+    display_name VARCHAR(256) NULL,
+    manufacturer VARCHAR(128) NULL,
+    model VARCHAR(128) NULL,
+    source ENUM('auto', 'manual', 'barcode') NOT NULL DEFAULT 'auto',
+    registered_at_ms BIGINT NOT NULL,
+    last_seen_at_ms BIGINT NOT NULL,
+    meta_json LONGTEXT NULL,
+    UNIQUE KEY uq_devices_company_external (company_id, external_id),
+    KEY idx_devices_company (company_id),
+    CONSTRAINT fk_devices_company FOREIGN KEY (company_id) REFERENCES companies (id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- reports.company_id / reports.device_id added by application migration when missing
+
+INSERT IGNORE INTO companies (id, slug, name) VALUES (1, 'default', 'Default');
diff --git a/examples/crash_reporter/backend/sql/schema.mariadb.sql b/examples/crash_reporter/backend/sql/schema.mariadb.sql
index b0427e5..bf2fb20 100644
--- a/examples/crash_reporter/backend/sql/schema.mariadb.sql
+++ b/examples/crash_reporter/backend/sql/schema.mariadb.sql
@@ -8,17 +8,56 @@ CREATE DATABASE IF NOT EXISTS androidcast_crashes
 
 USE androidcast_crashes;
 
+CREATE TABLE IF NOT EXISTS companies (
+    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    slug VARCHAR(64) NOT NULL,
+    name VARCHAR(128) NOT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE KEY uq_companies_slug (slug)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
 CREATE TABLE IF NOT EXISTS users (
     id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
     username VARCHAR(64) NOT NULL,
     password_hash VARCHAR(255) NOT NULL,
-    role ENUM('root', 'admin', 'viewer') NOT NULL DEFAULT 'viewer',
+    role ENUM('root', 'platform_admin', 'admin', 'viewer') NOT NULL DEFAULT 'viewer',
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     UNIQUE KEY uq_users_username (username)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+CREATE TABLE IF NOT EXISTS company_memberships (
+    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    user_id INT UNSIGNED NOT NULL,
+    company_id INT UNSIGNED NOT NULL,
+    role ENUM('owner', 'admin', 'member') NOT NULL DEFAULT 'member',
+    permissions_json LONGTEXT NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE KEY uq_membership_user_company (user_id, company_id),
+    KEY idx_membership_company (company_id),
+    CONSTRAINT fk_membership_user FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE,
+    CONSTRAINT fk_membership_company FOREIGN KEY (company_id) REFERENCES companies (id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS devices (
+    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    company_id INT UNSIGNED NOT NULL,
+    external_id VARCHAR(128) NOT NULL,
+    display_name VARCHAR(256) NULL,
+    manufacturer VARCHAR(128) NULL,
+    model VARCHAR(128) NULL,
+    source ENUM('auto', 'manual', 'barcode') NOT NULL DEFAULT 'auto',
+    registered_at_ms BIGINT NOT NULL,
+    last_seen_at_ms BIGINT NOT NULL,
+    meta_json LONGTEXT NULL,
+    UNIQUE KEY uq_devices_company_external (company_id, external_id),
+    KEY idx_devices_company (company_id),
+    CONSTRAINT fk_devices_company FOREIGN KEY (company_id) REFERENCES companies (id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
 CREATE TABLE IF NOT EXISTS reports (
     id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+    company_id INT UNSIGNED NOT NULL DEFAULT 1,
+    device_id BIGINT UNSIGNED NULL,
     report_id VARCHAR(128) NOT NULL,
     fingerprint VARCHAR(64) NOT NULL,
     crash_type VARCHAR(32) NOT NULL,
@@ -29,10 +68,14 @@ CREATE TABLE IF NOT EXISTS reports (
     payload_json LONGTEXT NOT NULL,
     tags_json LONGTEXT NOT NULL,
     UNIQUE KEY uq_reports_report_id (report_id),
+    KEY idx_reports_company (company_id),
+    KEY idx_reports_device (device_id),
     KEY idx_reports_generated (generated_at_ms),
     KEY idx_reports_received (received_at_ms),
     KEY idx_reports_fingerprint (fingerprint),
-    KEY idx_reports_fp_received (fingerprint, received_at_ms)
+    KEY idx_reports_fp_received (fingerprint, received_at_ms),
+    CONSTRAINT fk_reports_company FOREIGN KEY (company_id) REFERENCES companies (id),
+    CONSTRAINT fk_reports_device FOREIGN KEY (device_id) REFERENCES devices (id) ON DELETE SET NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
 CREATE TABLE IF NOT EXISTS report_views (
@@ -44,6 +87,11 @@ CREATE TABLE IF NOT EXISTS report_views (
         FOREIGN KEY (report_id) REFERENCES reports (id) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
+INSERT IGNORE INTO companies (id, slug, name) VALUES (1, 'default', 'Default');
+
 INSERT IGNORE INTO users (id, username, password_hash, role)
 VALUES (1, 'admin', '$2y$10$t2JyYCyjBwRxAHfmLwsnG.APoj/in0i6nxpKcQggdl.AkhFJR13o.', 'root');
 -- default password: admin — change in production
+
+INSERT IGNORE INTO company_memberships (user_id, company_id, role)
+VALUES (1, 1, 'owner');
diff --git a/examples/crash_reporter/backend/sql/schema.sqlite.sql b/examples/crash_reporter/backend/sql/schema.sqlite.sql
index 8d6a6ed..8b5dd3d 100644
--- a/examples/crash_reporter/backend/sql/schema.sqlite.sql
+++ b/examples/crash_reporter/backend/sql/schema.sqlite.sql
@@ -1,5 +1,12 @@
 PRAGMA foreign_keys = ON;
 
+CREATE TABLE IF NOT EXISTS companies (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    slug TEXT NOT NULL UNIQUE,
+    name TEXT NOT NULL,
+    created_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
 CREATE TABLE IF NOT EXISTS users (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
     username TEXT NOT NULL UNIQUE,
@@ -8,8 +15,37 @@ CREATE TABLE IF NOT EXISTS users (
     created_at TEXT NOT NULL DEFAULT (datetime('now'))
 );
 
+CREATE TABLE IF NOT EXISTS company_memberships (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id INTEGER NOT NULL,
+    company_id INTEGER NOT NULL,
+    role TEXT NOT NULL DEFAULT 'member',
+    permissions_json TEXT,
+    created_at TEXT NOT NULL DEFAULT (datetime('now')),
+    UNIQUE (user_id, company_id),
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+    FOREIGN KEY (company_id) REFERENCES companies(id) ON DELETE CASCADE
+);
+
+CREATE TABLE IF NOT EXISTS devices (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    company_id INTEGER NOT NULL,
+    external_id TEXT NOT NULL,
+    display_name TEXT,
+    manufacturer TEXT,
+    model TEXT,
+    source TEXT NOT NULL DEFAULT 'auto',
+    registered_at_ms INTEGER NOT NULL,
+    last_seen_at_ms INTEGER NOT NULL,
+    meta_json TEXT,
+    UNIQUE (company_id, external_id),
+    FOREIGN KEY (company_id) REFERENCES companies(id) ON DELETE CASCADE
+);
+
 CREATE TABLE IF NOT EXISTS reports (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
+    company_id INTEGER NOT NULL DEFAULT 1,
+    device_id INTEGER,
     report_id TEXT NOT NULL UNIQUE,
     fingerprint TEXT NOT NULL,
     crash_type TEXT NOT NULL,
@@ -18,7 +54,9 @@ CREATE TABLE IF NOT EXISTS reports (
     device_model TEXT,
     app_version TEXT,
     payload_json TEXT NOT NULL,
-    tags_json TEXT NOT NULL DEFAULT '[]'
+    tags_json TEXT NOT NULL DEFAULT '[]',
+    FOREIGN KEY (company_id) REFERENCES companies(id),
+    FOREIGN KEY (device_id) REFERENCES devices(id) ON DELETE SET NULL
 );
 
 CREATE TABLE IF NOT EXISTS report_views (
@@ -29,10 +67,16 @@ CREATE TABLE IF NOT EXISTS report_views (
     FOREIGN KEY (report_id) REFERENCES reports(id) ON DELETE CASCADE
 );
 
+CREATE INDEX IF NOT EXISTS idx_reports_company ON reports(company_id);
 CREATE INDEX IF NOT EXISTS idx_reports_generated ON reports(generated_at_ms DESC);
 CREATE INDEX IF NOT EXISTS idx_reports_received ON reports(received_at_ms DESC);
 CREATE INDEX IF NOT EXISTS idx_reports_fingerprint ON reports(fingerprint);
 
+INSERT OR IGNORE INTO companies (id, slug, name) VALUES (1, 'default', 'Default');
+
 INSERT OR IGNORE INTO users (id, username, password_hash, role)
 VALUES (1, 'admin', '$2y$10$t2JyYCyjBwRxAHfmLwsnG.APoj/in0i6nxpKcQggdl.AkhFJR13o.', 'root');
 -- password: admin
+
+INSERT OR IGNORE INTO company_memberships (user_id, company_id, role)
+VALUES (1, 1, 'owner');
diff --git a/examples/crash_reporter/backend/src/Auth.php b/examples/crash_reporter/backend/src/Auth.php
index 883b428..e3cef37 100644
--- a/examples/crash_reporter/backend/src/Auth.php
+++ b/examples/crash_reporter/backend/src/Auth.php
@@ -14,7 +14,24 @@ declare(strict_types=1);
 
 final class Auth {
     public static function user(): ?array {
-        return $_SESSION['user'] ?? null;
+        $u = $_SESSION['user'] ?? null;
+        if (!$u || !empty($u['companies'])) {
+            return $u;
+        }
+        $uid = (int) ($u['id'] ?? 0);
+        if ($uid <= 0) {
+            return $u;
+        }
+        $stmt = Database::pdo()->prepare('SELECT * FROM users WHERE id = ? LIMIT 1');
+        $stmt->execute([$uid]);
+        $row = $stmt->fetch();
+        if (!$row) {
+            return $u;
+        }
+        Database::ensureRbacSchema();
+        Rbac::seedMembershipsForUser($uid, (string) ($row['role'] ?? 'viewer'));
+        $_SESSION['user'] = Rbac::buildSessionUser($row);
+        return $_SESSION['user'];
     }
 
     public static function check(): void {
@@ -25,19 +42,11 @@ final class Auth {
     }
 
     public static function can(string $action): bool {
-        $u = self::user();
-        if (!$u) {
-            return false;
-        }
-        $role = $u['role'] ?? 'viewer';
-        if ($role === 'root' || $role === 'admin') {
-            return true;
-        }
-        return $action === 'view';
+        return Rbac::can($action);
     }
 
-    public static function canEditTags(): bool {
-        return self::can('tag_edit');
+    public static function canEditTags(?int $companyId = null): bool {
+        return Rbac::can('edit_tags', $companyId);
     }
 
     public static function login(string $username, string $password): bool {
@@ -48,11 +57,7 @@ final class Auth {
         if (!$row || !password_verify($password, $row['password_hash'])) {
             return false;
         }
-        $_SESSION['user'] = [
-            'id' => (int) $row['id'],
-            'username' => $row['username'],
-            'role' => $row['role'],
-        ];
+        $_SESSION['user'] = Rbac::buildSessionUser($row);
         return true;
     }
 
diff --git a/examples/crash_reporter/backend/src/Database.php b/examples/crash_reporter/backend/src/Database.php
index b373c22..db2fba8 100644
--- a/examples/crash_reporter/backend/src/Database.php
+++ b/examples/crash_reporter/backend/src/Database.php
@@ -98,6 +98,7 @@ final class Database {
         if (!$need('users') && !$need('reports') && self::reportsSchemaOk($pdo)) {
             self::ensureReportColumns($pdo);
             self::ensureReportViewsTable($pdo);
+            self::ensureRbacSchema($pdo);
             return;
         }
         $schemaFile = __DIR__ . '/../sql/schema.sqlite.sql';
@@ -110,6 +111,7 @@ final class Database {
         $pdo->exec((string) file_get_contents($schemaFile));
         self::ensureReportColumns($pdo);
         self::ensureReportViewsTable($pdo);
+        self::ensureRbacSchema($pdo);
     }
 
     private static function ensureMysqlSchema(PDO $pdo): void {
@@ -153,6 +155,186 @@ final class Database {
             self::ensureMysqlReportColumns($pdo);
         }
         self::ensureMysqlReportViewsTable($pdo);
+        self::ensureRbacSchema($pdo);
+    }
+
+    /** Phase 1 RBAC tables + report company/device columns (idempotent). */
+    public static function ensureRbacSchema(?PDO $pdo = null): void {
+        $pdo ??= self::$pdo;
+        if ($pdo === null) {
+            return;
+        }
+        self::ensureCompaniesTable($pdo);
+        self::seedDefaultCompany($pdo);
+        self::ensureCompanyMembershipsTable($pdo);
+        self::ensureDevicesTable($pdo);
+        self::ensureReportCompanyColumns($pdo);
+        self::backfillCompanyMemberships($pdo);
+    }
+
+    private static function ensureCompaniesTable(PDO $pdo): void {
+        if (self::tableExists($pdo, 'companies')) {
+            return;
+        }
+        if (self::isMysql()) {
+            $pdo->exec(
+                "CREATE TABLE companies (
+                    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+                    slug VARCHAR(64) NOT NULL,
+                    name VARCHAR(128) NOT NULL,
+                    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                    UNIQUE KEY uq_companies_slug (slug)
+                ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
+            );
+            return;
+        }
+        $pdo->exec(
+            "CREATE TABLE companies (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                slug TEXT NOT NULL UNIQUE,
+                name TEXT NOT NULL,
+                created_at TEXT NOT NULL DEFAULT (datetime('now'))
+            )"
+        );
+    }
+
+    private static function seedDefaultCompany(PDO $pdo): void {
+        if (self::isMysql()) {
+            $pdo->exec("INSERT IGNORE INTO companies (id, slug, name) VALUES (1, 'default', 'Default')");
+            return;
+        }
+        $pdo->exec("INSERT OR IGNORE INTO companies (id, slug, name) VALUES (1, 'default', 'Default')");
+    }
+
+    private static function ensureCompanyMembershipsTable(PDO $pdo): void {
+        if (self::tableExists($pdo, 'company_memberships')) {
+            return;
+        }
+        if (self::isMysql()) {
+            $pdo->exec(
+                "CREATE TABLE company_memberships (
+                    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+                    user_id INT UNSIGNED NOT NULL,
+                    company_id INT UNSIGNED NOT NULL,
+                    role ENUM('owner', 'admin', 'member') NOT NULL DEFAULT 'member',
+                    permissions_json LONGTEXT NULL,
+                    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+                    UNIQUE KEY uq_membership_user_company (user_id, company_id),
+                    KEY idx_membership_company (company_id)
+                ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
+            );
+            return;
+        }
+        $pdo->exec(
+            "CREATE TABLE company_memberships (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                user_id INTEGER NOT NULL,
+                company_id INTEGER NOT NULL,
+                role TEXT NOT NULL DEFAULT 'member',
+                permissions_json TEXT,
+                created_at TEXT NOT NULL DEFAULT (datetime('now')),
+                UNIQUE (user_id, company_id)
+            )"
+        );
+    }
+
+    private static function ensureDevicesTable(PDO $pdo): void {
+        if (self::tableExists($pdo, 'devices')) {
+            return;
+        }
+        if (self::isMysql()) {
+            $pdo->exec(
+                "CREATE TABLE devices (
+                    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+                    company_id INT UNSIGNED NOT NULL,
+                    external_id VARCHAR(128) NOT NULL,
+                    display_name VARCHAR(256) NULL,
+                    manufacturer VARCHAR(128) NULL,
+                    model VARCHAR(128) NULL,
+                    source ENUM('auto', 'manual', 'barcode') NOT NULL DEFAULT 'auto',
+                    registered_at_ms BIGINT NOT NULL,
+                    last_seen_at_ms BIGINT NOT NULL,
+                    meta_json LONGTEXT NULL,
+                    UNIQUE KEY uq_devices_company_external (company_id, external_id),
+                    KEY idx_devices_company (company_id)
+                ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci"
+            );
+            return;
+        }
+        $pdo->exec(
+            "CREATE TABLE devices (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                company_id INTEGER NOT NULL,
+                external_id TEXT NOT NULL,
+                display_name TEXT,
+                manufacturer TEXT,
+                model TEXT,
+                source TEXT NOT NULL DEFAULT 'auto',
+                registered_at_ms INTEGER NOT NULL,
+                last_seen_at_ms INTEGER NOT NULL,
+                meta_json TEXT,
+                UNIQUE (company_id, external_id)
+            )"
+        );
+    }
+
+    private static function ensureReportCompanyColumns(PDO $pdo): void {
+        if (!self::tableExists($pdo, 'reports')) {
+            return;
+        }
+        $names = self::columnNames($pdo, 'reports');
+        if (!in_array('company_id', $names, true)) {
+            if (self::isMysql()) {
+                $pdo->exec(
+                    'ALTER TABLE reports ADD COLUMN company_id INT UNSIGNED NOT NULL DEFAULT 1'
+                );
+                $pdo->exec('ALTER TABLE reports ADD KEY idx_reports_company (company_id)');
+            } else {
+                $pdo->exec('ALTER TABLE reports ADD COLUMN company_id INTEGER NOT NULL DEFAULT 1');
+            }
+            $pdo->exec('UPDATE reports SET company_id = 1 WHERE company_id IS NULL OR company_id = 0');
+        }
+        $names = self::columnNames($pdo, 'reports');
+        if (!in_array('device_id', $names, true)) {
+            if (self::isMysql()) {
+                $pdo->exec('ALTER TABLE reports ADD COLUMN device_id BIGINT UNSIGNED NULL');
+                $pdo->exec('ALTER TABLE reports ADD KEY idx_reports_device (device_id)');
+            } else {
+                $pdo->exec('ALTER TABLE reports ADD COLUMN device_id INTEGER NULL');
+            }
+        }
+    }
+
+    private static function backfillCompanyMemberships(PDO $pdo): void {
+        if (!self::tableExists($pdo, 'users') || !self::tableExists($pdo, 'company_memberships')) {
+            return;
+        }
+        $companyId = 1;
+        $rows = $pdo->query('SELECT id, role FROM users')->fetchAll(PDO::FETCH_ASSOC);
+        foreach ($rows as $row) {
+            $uid = (int) $row['id'];
+            $globalRole = strtolower((string) ($row['role'] ?? 'viewer'));
+            $companyRole = in_array($globalRole, ['root', 'admin', 'platform_admin'], true) ? 'owner' : 'member';
+            if (self::isMysql()) {
+                $stmt = $pdo->prepare(
+                    'INSERT IGNORE INTO company_memberships (user_id, company_id, role) VALUES (?, ?, ?)'
+                );
+            } else {
+                $stmt = $pdo->prepare(
+                    'INSERT OR IGNORE INTO company_memberships (user_id, company_id, role) VALUES (?, ?, ?)'
+                );
+            }
+            $stmt->execute([$uid, $companyId, $companyRole]);
+        }
+        if (self::isMysql()) {
+            $pdo->exec(
+                "INSERT IGNORE INTO company_memberships (user_id, company_id, role) VALUES (1, 1, 'owner')"
+            );
+        } else {
+            $pdo->exec(
+                "INSERT OR IGNORE INTO company_memberships (user_id, company_id, role) VALUES (1, 1, 'owner')"
+            );
+        }
     }
 
     private static function ensureMysqlReportColumns(PDO $pdo): void {
diff --git a/examples/crash_reporter/backend/src/DeviceRepository.php b/examples/crash_reporter/backend/src/DeviceRepository.php
new file mode 100644
index 0000000..d207497
--- /dev/null
+++ b/examples/crash_reporter/backend/src/DeviceRepository.php
@@ -0,0 +1,103 @@
+<?php
+declare(strict_types=1);
+
+/** Phase 1 device registry — auto-register on crash upload. */
+final class DeviceRepository {
+    public static function externalKey(array $device): string {
+        $parts = array_filter([
+            (string) ($device['manufacturer'] ?? ''),
+            (string) ($device['brand'] ?? ''),
+            (string) ($device['model'] ?? ''),
+            (string) ($device['product'] ?? ''),
+            (string) ($device['device'] ?? ''),
+            (string) ($device['serial'] ?? ''),
+            (string) ($device['android_id'] ?? ''),
+        ], static fn ($v) => $v !== '');
+        if ($parts === []) {
+            return 'unknown';
+        }
+        return substr(hash('sha256', implode('|', $parts)), 0, 32);
+    }
+
+    public static function upsertFromPayload(int $companyId, array $device, string $source = 'auto'): int {
+        $companyId = max(1, $companyId);
+        $externalId = self::externalKey($device);
+        $now = (int) round(microtime(true) * 1000);
+        $manufacturer = trim((string) ($device['manufacturer'] ?? ''));
+        $model = trim((string) ($device['model'] ?? ''));
+        $display = trim($manufacturer . ' ' . $model);
+        $meta = json_encode($device, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+        if ($meta === false) {
+            $meta = '{}';
+        }
+
+        $pdo = Database::pdo();
+        if (Database::isMysql()) {
+            $stmt = $pdo->prepare(
+                'INSERT INTO devices (company_id, external_id, display_name, manufacturer, model, source,
+                    registered_at_ms, last_seen_at_ms, meta_json)
+                 VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+                 ON DUPLICATE KEY UPDATE
+                    display_name = VALUES(display_name),
+                    manufacturer = VALUES(manufacturer),
+                    model = VALUES(model),
+                    last_seen_at_ms = VALUES(last_seen_at_ms),
+                    meta_json = VALUES(meta_json)'
+            );
+            $stmt->execute([
+                $companyId,
+                $externalId,
+                $display !== '' ? $display : null,
+                $manufacturer !== '' ? $manufacturer : null,
+                $model !== '' ? $model : null,
+                $source,
+                $now,
+                $now,
+                $meta,
+            ]);
+            $sel = $pdo->prepare(
+                'SELECT id FROM devices WHERE company_id = ? AND external_id = ? LIMIT 1'
+            );
+            $sel->execute([$companyId, $externalId]);
+            return (int) $sel->fetchColumn();
+        }
+
+        $stmt = $pdo->prepare(
+            'SELECT id FROM devices WHERE company_id = ? AND external_id = ? LIMIT 1'
+        );
+        $stmt->execute([$companyId, $externalId]);
+        $existing = $stmt->fetchColumn();
+        if ($existing !== false) {
+            $upd = $pdo->prepare(
+                'UPDATE devices SET display_name = ?, manufacturer = ?, model = ?,
+                    last_seen_at_ms = ?, meta_json = ? WHERE id = ?'
+            );
+            $upd->execute([
+                $display !== '' ? $display : null,
+                $manufacturer !== '' ? $manufacturer : null,
+                $model !== '' ? $model : null,
+                $now,
+                $meta,
+                (int) $existing,
+            ]);
+            return (int) $existing;
+        }
+        $ins = $pdo->prepare(
+            'INSERT INTO devices (company_id, external_id, display_name, manufacturer, model, source,
+                registered_at_ms, last_seen_at_ms, meta_json)
+             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)'
+        );
+        $ins->execute([
+            $companyId,
+            $externalId,
+            $display !== '' ? $display : null,
+            $manufacturer !== '' ? $manufacturer : null,
+            $model !== '' ? $model : null,
+            $source,
+            $now,
+            $now,
+            $meta,
+        ]);
+        return (int) $pdo->lastInsertId();
+    }
+}
diff --git a/examples/crash_reporter/backend/src/Rbac.php b/examples/crash_reporter/backend/src/Rbac.php
new file mode 100644
index 0000000..16a079f
--- /dev/null
+++ b/examples/crash_reporter/backend/src/Rbac.php
@@ -0,0 +1,290 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Phase 1 RBAC: global platform roles + company memberships.
+ * MariaDB-style: global scope (root/platform) vs company scope (owner/admin/member).
+ */
+final class Rbac {
+    /** Global roles stored on users.role */
+    public const GLOBAL_ROOT = 'root';
+    public const GLOBAL_PLATFORM_ADMIN = 'platform_admin';
+    /** Legacy alias — treated as platform_admin */
+    public const GLOBAL_ADMIN_LEGACY = 'admin';
+    public const GLOBAL_VIEWER = 'viewer';
+
+    public const COMPANY_OWNER = 'owner';
+    public const COMPANY_ADMIN = 'admin';
+    public const COMPANY_MEMBER = 'member';
+
+    /** @var list<string> */
+    private const GLOBAL_ADMIN_ROLES = [self::GLOBAL_ROOT, self::GLOBAL_PLATFORM_ADMIN, self::GLOBAL_ADMIN_LEGACY];
+
+    /** Company role => granted actions (unless global admin). */
+    private const COMPANY_ROLE_ACTIONS = [
+        self::COMPANY_OWNER => [
+            'view_reports',
+            'edit_tags',
+            'upload_reports',
+            'manage_devices',
+            'manage_company_users',
+            'manage_company_settings',
+            'manage_self',
+        ],
+        self::COMPANY_ADMIN => [
+            'view_reports',
+            'edit_tags',
+            'upload_reports',
+            'manage_devices',
+            'manage_company_users',
+            'manage_self',
+        ],
+        self::COMPANY_MEMBER => [
+            'view_reports',
+            'manage_self',
+        ],
+    ];
+
+    public static function normalizeGlobalRole(string $role): string {
+        $role = strtolower(trim($role));
+        if ($role === self::GLOBAL_ADMIN_LEGACY) {
+            return self::GLOBAL_PLATFORM_ADMIN;
+        }
+        return $role;
+    }
+
+    public static function isGlobalAdmin(?array $user = null): bool {
+        $user ??= Auth::user();
+        if (!$user) {
+            return false;
+        }
+        $role = self::normalizeGlobalRole((string) ($user['role'] ?? ''));
+        return in_array($role, self::GLOBAL_ADMIN_ROLES, true);
+    }
+
+    /** @return list<int>|null null = all companies (global admin) */
+    public static function allowedCompanyIds(?array $user = null): ?array {
+        if (self::isGlobalAdmin($user)) {
+            return null;
+        }
+        $user ??= Auth::user();
+        if (!$user) {
+            return [];
+        }
+        $ids = [];
+        foreach ($user['companies'] ?? [] as $c) {
+            if (isset($c['id'])) {
+                $ids[] = (int) $c['id'];
+            }
+        }
+        return array_values(array_unique($ids));
+    }
+
+    public static function activeCompanyId(?array $user = null): ?int {
+        $user ??= Auth::user();
+        if (!$user) {
+            return null;
+        }
+        $id = (int) ($user['active_company_id'] ?? 0);
+        return $id > 0 ? $id : null;
+    }
+
+    public static function companyRole(int $userId, int $companyId): ?string {
+        $stmt = Database::pdo()->prepare(
+            'SELECT role FROM company_memberships WHERE user_id = ? AND company_id = ? LIMIT 1'
+        );
+        $stmt->execute([$userId, $companyId]);
+        $role = $stmt->fetchColumn();
+        return is_string($role) && $role !== '' ? $role : null;
+    }
+
+    public static function can(string $action, ?int $companyId = null, ?array $user = null): bool {
+        $user ??= Auth::user();
+        if (!$user) {
+            return false;
+        }
+        if (self::isGlobalAdmin($user)) {
+            return true;
+        }
+        if ($action === 'manage_platform') {
+            return false;
+        }
+        if ($action === 'manage_self') {
+            return true;
+        }
+        $companyId ??= self::activeCompanyId($user);
+        if ($companyId === null || $companyId <= 0) {
+            return false;
+        }
+        $role = self::membershipRoleForUser($user, $companyId);
+        if ($role === null) {
+            return false;
+        }
+        $grants = self::COMPANY_ROLE_ACTIONS[$role] ?? [];
+        if (in_array($action, $grants, true)) {
+            return true;
+        }
+        return self::hasPermissionOverride($user, $companyId, $action);
+    }
+
+    public static function canAccessCompany(int $companyId, ?array $user = null): bool {
+        $allowed = self::allowedCompanyIds($user);
+        if ($allowed === null) {
+            return true;
+        }
+        return in_array($companyId, $allowed, true);
+    }
+
+    public static function canAccessReport(array $report, ?array $user = null): bool {
+        $companyId = (int) ($report['company_id'] ?? 0);
+        if ($companyId <= 0) {
+            return self::isGlobalAdmin($user);
+        }
+        return self::canAccessCompany($companyId, $user);
+    }
+
+    public static function defaultCompanyId(): int {
+        static $cached = 0;
+        if ($cached > 0) {
+            return $cached;
+        }
+        $fromCfg = (int) cfg('rbac.default_company_id', 0);
+        if ($fromCfg > 0) {
+            $cached = $fromCfg;
+            return $cached;
+        }
+        $slug = (string) cfg('rbac.default_company_slug', 'default');
+        $pdo = Database::pdo();
+        $stmt = $pdo->prepare('SELECT id FROM companies WHERE slug = ? LIMIT 1');
+        $stmt->execute([$slug]);
+        $id = (int) $stmt->fetchColumn();
+        if ($id > 0) {
+            $cached = $id;
+            return $cached;
+        }
+        $cached = 1;
+        return $cached;
+    }
+
+    /**
+     * Append company scope to WHERE fragments.
+     *
+     * @param list<string> $where
+     * @param list<mixed> $params
+     */
+    public static function appendCompanyScope(string $column, array &$where, array &$params, ?array $user = null): void {
+        $allowed = self::allowedCompanyIds($user);
+        if ($allowed === null) {
+            return;
+        }
+        if ($allowed === []) {
+            $where[] = '0=1';
+            return;
+        }
+        $placeholders = implode(',', array_fill(0, count($allowed), '?'));
+        $where[] = "$column IN ($placeholders)";
+        foreach ($allowed as $id) {
+            $params[] = $id;
+        }
+    }
+
+    /** Match fingerprint counts within the same company. */
+    public static function fingerprintCountSql(string $rAlias = 'r', string $r2Alias = 'r2'): string {
+        return " AND $r2Alias.company_id = $rAlias.company_id";
+    }
+
+    /**
+     * @return list<array{id:int,slug:string,name:string,role:string}>
+     */
+    public static function fetchMemberships(int $userId): array {
+        $stmt = Database::pdo()->prepare(
+            'SELECT c.id, c.slug, c.name, m.role
+             FROM company_memberships m
+             INNER JOIN companies c ON c.id = m.company_id
+             WHERE m.user_id = ?
+             ORDER BY c.name ASC'
+        );
+        $stmt->execute([$userId]);
+        $rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
+        $out = [];
+        foreach ($rows as $row) {
+            $out[] = [
+                'id' => (int) $row['id'],
+                'slug' => (string) $row['slug'],
+                'name' => (string) $row['name'],
+                'role' => (string) $row['role'],
+            ];
+        }
+        return $out;
+    }
+
+    /**
+     * @param list<array{id:int,slug:string,name:string,role:string}> $memberships
+     */
+    public static function pickActiveCompanyId(array $memberships): int {
+        if ($memberships === []) {
+            return self::defaultCompanyId();
+        }
+        return (int) $memberships[0]['id'];
+    }
+
+    /** @return array<string, mixed> session user payload */
+    public static function buildSessionUser(array $dbUser): array {
+        $uid = (int) $dbUser['id'];
+        $memberships = self::fetchMemberships($uid);
+        return [
+            'id' => $uid,
+            'username' => (string) $dbUser['username'],
+            'role' => self::normalizeGlobalRole((string) ($dbUser['role'] ?? self::GLOBAL_VIEWER)),
+            'companies' => $memberships,
+            'active_company_id' => self::pickActiveCompanyId($memberships),
+        ];
+    }
+
+    public static function seedMembershipsForUser(int $userId, string $globalRole): void {
+        $pdo = Database::pdo();
+        $companyId = self::defaultCompanyId();
+        $globalRole = self::normalizeGlobalRole($globalRole);
+        $companyRole = self::COMPANY_MEMBER;
+        if (in_array($globalRole, self::GLOBAL_ADMIN_ROLES, true)) {
+            $companyRole = self::COMPANY_OWNER;
+        }
+        if (Database::isMysql()) {
+            $sql = 'INSERT IGNORE INTO company_memberships (user_id, company_id, role) VALUES (?, ?, ?)';
+        } else {
+            $sql = 'INSERT OR IGNORE INTO company_memberships (user_id, company_id, role) VALUES (?, ?, ?)';
+        }
+        $stmt = $pdo->prepare($sql);
+        $stmt->execute([$userId, $companyId, $companyRole]);
+    }
+
+    private static function membershipRoleForUser(array $user, int $companyId): ?string {
+        foreach ($user['companies'] ?? [] as $c) {
+            if ((int) ($c['id'] ?? 0) === $companyId) {
+                return (string) ($c['role'] ?? '');
+            }
+        }
+        return null;
+    }
+
+    private static function hasPermissionOverride(array $user, int $companyId, string $action): bool {
+        $pdo = Database::pdo();
+        $stmt = $pdo->prepare(
+            'SELECT permissions_json FROM company_memberships WHERE user_id = ? AND company_id = ? LIMIT 1'
+        );
+        $stmt->execute([(int) $user['id'], $companyId]);
+        $raw = $stmt->fetchColumn();
+        if (!is_string($raw) || $raw === '') {
+            return false;
+        }
+        $decoded = json_decode($raw, true);
+        if (!is_array($decoded)) {
+            return false;
+        }
+        $grants = $decoded['grants'] ?? $decoded;
+        if (!is_array($grants)) {
+            return false;
+        }
+        return in_array($action, $grants, true);
+    }
+}
diff --git a/examples/crash_reporter/backend/src/ReportRepository.php b/examples/crash_reporter/backend/src/ReportRepository.php
index 4a721f3..e10205b 100644
--- a/examples/crash_reporter/backend/src/ReportRepository.php
+++ b/examples/crash_reporter/backend/src/ReportRepository.php
@@ -23,19 +23,23 @@ final class ReportRepository {
 
     public static function insert(array $payload): void {
         $pdo = Database::pdo();
-        $device = $payload['device'] ?? [];
-        $app = $payload['app'] ?? [];
+        $device = is_array($payload['device'] ?? null) ? $payload['device'] : [];
+        $app = is_array($payload['app'] ?? null) ? $payload['app'] : [];
         $json = json_encode($payload, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
         if ($json === false) {
             throw new RuntimeException('payload json_encode failed: ' . json_last_error_msg());
         }
         $tags = json_encode($payload['tags'] ?? [], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
+        $companyId = Rbac::defaultCompanyId();
+        $deviceId = DeviceRepository::upsertFromPayload($companyId, $device, 'auto');
         $stmt = $pdo->prepare(
-            'INSERT INTO reports (report_id, fingerprint, crash_type, generated_at_ms, received_at_ms,
-                device_model, app_version, payload_json, tags_json)
-             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)'
+            'INSERT INTO reports (company_id, device_id, report_id, fingerprint, crash_type, generated_at_ms,
+                received_at_ms, device_model, app_version, payload_json, tags_json)
+             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)'
         );
         $stmt->execute([
+            $companyId,
+            $deviceId > 0 ? $deviceId : null,
             $payload['report_id'] ?? uniqid('rpt_', true),
             $payload['fingerprint'] ?? 'unknown',
             $payload['crash_type'] ?? 'java',
@@ -69,9 +73,17 @@ final class ReportRepository {
 
         if ($grouped) {
             $sortCol = in_array($sort, self::GROUP_SORT, true) ? $sort : 'cnt';
-            $total = (int) $pdo->query(
-                'SELECT COUNT(*) FROM (SELECT 1 FROM reports GROUP BY fingerprint, crash_type)'
-            )->fetchColumn();
+            $gWhere = ['1=1'];
+            $gParams = [];
+            self::appendCompanyScope('company_id', $gWhere, $gParams);
+            $gWhereSql = implode(' AND ', $gWhere);
+            $countStmt = $pdo->prepare(
+                "SELECT COUNT(*) FROM (
+                    SELECT 1 FROM reports WHERE $gWhereSql GROUP BY fingerprint, crash_type
+                 ) t"
+            );
+            $countStmt->execute($gParams);
+            $total = (int) $countStmt->fetchColumn();
             $sql = "SELECT fingerprint, crash_type,
                            MIN(device_model) AS device_model,
                            MAX(app_version) AS app_version,
@@ -79,10 +91,13 @@ final class ReportRepository {
                            MAX(generated_at_ms) AS last_generated_ms,
                            MAX(received_at_ms) AS last_received_ms
                     FROM reports
+                    WHERE $gWhereSql
                     GROUP BY fingerprint, crash_type
                     ORDER BY $sortCol $dir
                     LIMIT $perPage OFFSET $offset";
-            $items = $pdo->query($sql)->fetchAll();
+            $stmt = $pdo->prepare($sql);
+            $stmt->execute($gParams);
+            $items = $stmt->fetchAll();
             foreach ($items as &$row) {
                 $row['fingerprint_cnt'] = (int) ($row['cnt'] ?? 0);
                 $row['fingerprint_recent_cnt'] = $sinceMs > 0 && (int) ($row['last_received_ms'] ?? 0) > $sinceMs
@@ -109,19 +124,27 @@ final class ReportRepository {
             $sortCol = 'fingerprint_cnt';
         }
         $orderBy = self::buildListOrder($sortCol === 'priority' ? 'priority' : $sortCol, $dir);
-        $total = (int) $pdo->query('SELECT COUNT(*) FROM reports')->fetchColumn();
+        $where = ['1=1'];
+        $scopeParams = [];
+        self::appendCompanyScope('r.company_id', $where, $scopeParams);
+        $whereSql = implode(' AND ', $where);
+        $fpCnt = self::fingerprintCountSql();
+        $countStmt = $pdo->prepare("SELECT COUNT(*) FROM reports r WHERE $whereSql");
+        $countStmt->execute($scopeParams);
+        $total = (int) $countStmt->fetchColumn();
         $sql = "SELECT r.id, r.report_id, r.fingerprint, r.crash_type, r.generated_at_ms, r.received_at_ms,
                        r.device_model, r.app_version, r.payload_json, r.tags_json,
                        CASE WHEN v.viewed_at_ms IS NOT NULL THEN 1 ELSE 0 END AS viewed,
-                       (SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint) AS fingerprint_cnt,
+                       {$fpCnt} AS fingerprint_cnt,
                        (SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint
-                           AND r2.received_at_ms > ?) AS fingerprint_recent_cnt
+                           AND r2.company_id = r.company_id AND r2.received_at_ms > ?) AS fingerprint_recent_cnt
                 FROM reports r
                 LEFT JOIN report_views v ON v.report_id = r.id AND v.user_id = ?
+                WHERE $whereSql
                 ORDER BY $orderBy
                 LIMIT $perPage OFFSET $offset";
         $stmt = $pdo->prepare($sql);
-        $stmt->execute([$sinceMs, $userId]);
+        $stmt->execute(array_merge($scopeParams, [$sinceMs, $userId]));
         $items = $stmt->fetchAll();
         self::finishListRows($items, $sinceMs, false);
 
@@ -154,6 +177,7 @@ final class ReportRepository {
         $userId = (int) (Auth::user()['id'] ?? 0);
         $where = ['1=1'];
         $params = [];
+        self::appendCompanyScope('r.company_id', $where, $params);
         $device = trim((string) ($filters['device'] ?? ''));
         if ($device !== '') {
             $like = '%' . $device . '%';
@@ -200,19 +224,20 @@ final class ReportRepository {
         }
         $orderBy = self::buildListOrder($sortCol === 'priority' ? 'priority' : $sortCol, $dir);
         $offset = ($page - 1) * $perPage;
+        $fpCnt = self::fingerprintCountSql();
         $sql = "SELECT r.id, r.report_id, r.fingerprint, r.crash_type, r.generated_at_ms, r.received_at_ms,
                        r.device_model, r.app_version, r.payload_json, r.tags_json,
                        CASE WHEN v.viewed_at_ms IS NOT NULL THEN 1 ELSE 0 END AS viewed,
-                       (SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint) AS fingerprint_cnt,
+                       {$fpCnt} AS fingerprint_cnt,
                        (SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint
-                           AND r2.received_at_ms > ?) AS fingerprint_recent_cnt
+                           AND r2.company_id = r.company_id AND r2.received_at_ms > ?) AS fingerprint_recent_cnt
                 FROM reports r
                 LEFT JOIN report_views v ON v.report_id = r.id AND v.user_id = ?
                 WHERE $whereSql
                 ORDER BY $orderBy
                 LIMIT $perPage OFFSET $offset";
         $stmt = $pdo->prepare($sql);
-        $stmt->execute(array_merge([$sinceMs, $userId], $params));
+        $stmt->execute(array_merge($params, [$sinceMs, $userId]));
         $items = $stmt->fetchAll();
         self::finishListRows($items, $sinceMs, false);
         return [
@@ -260,6 +285,7 @@ final class ReportRepository {
 
         $where = ['r.id != ?'];
         $params = [$anchorId];
+        self::appendCompanyScope('r.company_id', $where, $params);
         $or = [];
         if ($fp !== '') {
             $or[] = 'r.fingerprint = ?';
@@ -288,19 +314,20 @@ final class ReportRepository {
         $where[] = '(' . implode(' OR ', $or) . ')';
         $whereSql = implode(' AND ', $where);
 
+        $fpCnt = self::fingerprintCountSql();
         $sql = "SELECT r.id, r.report_id, r.fingerprint, r.crash_type, r.generated_at_ms, r.received_at_ms,
                        r.device_model, r.app_version, r.payload_json, r.tags_json,
                        CASE WHEN v.viewed_at_ms IS NOT NULL THEN 1 ELSE 0 END AS viewed,
-                       (SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint) AS fingerprint_cnt,
+                       {$fpCnt} AS fingerprint_cnt,
                        (SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint
-                           AND r2.received_at_ms > ?) AS fingerprint_recent_cnt
+                           AND r2.company_id = r.company_id AND r2.received_at_ms > ?) AS fingerprint_recent_cnt
                 FROM reports r
                 LEFT JOIN report_views v ON v.report_id = r.id AND v.user_id = ?
                 WHERE $whereSql
                 ORDER BY r.received_at_ms DESC
                 LIMIT 1200";
         $stmt = $pdo->prepare($sql);
-        $stmt->execute(array_merge([$sinceMs, $userId], $params));
+        $stmt->execute(array_merge($params, [$sinceMs, $userId]));
         $rows = $stmt->fetchAll();
         $scored = [];
         foreach ($rows as $row) {
@@ -386,10 +413,15 @@ final class ReportRepository {
             return [];
         }
         $pdo = Database::pdo();
-        $stmt = $pdo->query(
-            'SELECT payload_json, device_model, app_version, crash_type FROM reports
-             ORDER BY received_at_ms DESC LIMIT 500'
+        $where = ['1=1'];
+        $params = [];
+        self::appendCompanyScope('company_id', $where, $params);
+        $whereSql = implode(' AND ', $where);
+        $stmt = $pdo->prepare(
+            "SELECT payload_json, device_model, app_version, crash_type FROM reports
+             WHERE $whereSql ORDER BY received_at_ms DESC LIMIT 500"
         );
+        $stmt->execute($params);
         $freq = [];
         while ($row = $stmt->fetch()) {
             $payload = json_decode($row['payload_json'] ?? '', true);
@@ -450,28 +482,32 @@ final class ReportRepository {
         $page = max(1, $page);
         $perPage = max(1, min(200, $perPage));
         $userId = (int) (Auth::user()['id'] ?? 0);
-        $orParts = [];
+        $where = ['1=1'];
         $params = [];
+        self::appendCompanyScope('r.company_id', $where, $params);
+        $orParts = [];
         foreach ($tokens as $token) {
             $like = '%' . $token . '%';
             $orParts[] = '(r.payload_json LIKE ? OR r.device_model LIKE ? OR r.app_version LIKE ?
                 OR r.fingerprint LIKE ? OR r.crash_type LIKE ?)';
             array_push($params, $like, $like, $like, $like, $like);
         }
-        $whereSql = '(' . implode(' OR ', $orParts) . ')';
+        $where[] = '(' . implode(' OR ', $orParts) . ')';
+        $whereSql = implode(' AND ', $where);
+        $fpCnt = self::fingerprintCountSql();
         $sql = "SELECT r.id, r.report_id, r.fingerprint, r.crash_type, r.generated_at_ms, r.received_at_ms,
                        r.device_model, r.app_version, r.payload_json, r.tags_json,
                        CASE WHEN v.viewed_at_ms IS NOT NULL THEN 1 ELSE 0 END AS viewed,
-                       (SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint) AS fingerprint_cnt,
+                       {$fpCnt} AS fingerprint_cnt,
                        (SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint
-                           AND r2.received_at_ms > ?) AS fingerprint_recent_cnt
+                           AND r2.company_id = r.company_id AND r2.received_at_ms > ?) AS fingerprint_recent_cnt
                 FROM reports r
                 LEFT JOIN report_views v ON v.report_id = r.id AND v.user_id = ?
                 WHERE $whereSql
                 ORDER BY r.received_at_ms DESC
                 LIMIT 1500";
         $stmt = $pdo->prepare($sql);
-        $stmt->execute(array_merge([$sinceMs, $userId], $params));
+        $stmt->execute(array_merge($params, [$sinceMs, $userId]));
         $scored = [];
         while ($row = $stmt->fetch()) {
             $payload = json_decode($row['payload_json'] ?? '', true);
@@ -569,8 +605,13 @@ final class ReportRepository {
     /** Distinct custom tags used across reports (for suggestions). */
     public static function listTagPresets(int $limit = 40): array {
         $pdo = Database::pdo();
-        $rows = $pdo->query('SELECT tags_json FROM reports WHERE tags_json IS NOT NULL AND tags_json != \'[]\' LIMIT 500')
-            ->fetchAll();
+        $where = ['tags_json IS NOT NULL', "tags_json != '[]'"];
+        $params = [];
+        self::appendCompanyScope('company_id', $where, $params);
+        $whereSql = implode(' AND ', $where);
+        $stmt = $pdo->prepare("SELECT tags_json FROM reports WHERE $whereSql LIMIT 500");
+        $stmt->execute($params);
+        $rows = $stmt->fetchAll();
         $map = [];
         foreach ($rows as $row) {
             foreach (parse_report_tags($row['tags_json'] ?? '[]') as $tag) {
@@ -602,10 +643,26 @@ final class ReportRepository {
         if (!$row) {
             return null;
         }
+        if (!Rbac::canAccessReport($row)) {
+            return null;
+        }
         $decoded = json_decode($row['payload_json'], true);
         $row['payload'] = is_array($decoded) ? $decoded : [];
         $row['tags'] = parse_report_tags($row['tags_json'] ?? '[]');
         $row['viewed'] = (bool) ($row['viewed'] ?? false);
         return $row;
     }
+
+    /**
+     * @param list<string> $where
+     * @param list<mixed> $params
+     */
+    private static function appendCompanyScope(string $column, array &$where, array &$params): void {
+        Rbac::appendCompanyScope($column, $where, $params);
+    }
+
+    private static function fingerprintCountSql(): string {
+        $scope = Rbac::fingerprintCountSql('r', 'r2');
+        return "(SELECT COUNT(*) FROM reports r2 WHERE r2.fingerprint = r.fingerprint{$scope})";
+    }
 }
diff --git a/examples/crash_reporter/backend/src/bootstrap.php b/examples/crash_reporter/backend/src/bootstrap.php
index c0bf737..50b1b23 100644
--- a/examples/crash_reporter/backend/src/bootstrap.php
+++ b/examples/crash_reporter/backend/src/bootstrap.php
@@ -33,6 +33,8 @@ if (session_status() !== PHP_SESSION_ACTIVE) {
 }
 
 require_once __DIR__ . '/Database.php';
+require_once __DIR__ . '/Rbac.php';
+require_once __DIR__ . '/DeviceRepository.php';
 require_once __DIR__ . '/Auth.php';
 require_once __DIR__ . '/ReportRepository.php';
 
diff --git a/examples/crash_reporter/backend/views/layout.php b/examples/crash_reporter/backend/views/layout.php
index c5ea72c..e646d59 100644
--- a/examples/crash_reporter/backend/views/layout.php
+++ b/examples/crash_reporter/backend/views/layout.php
@@ -21,9 +21,12 @@
     (function () {
       var t = localStorage.getItem('crash_console_theme');
       if (t === 'light' || t === 'dark') document.documentElement.setAttribute('data-theme', t);
+      var l = localStorage.getItem('crash_console_lang');
+      if (l === 'en' || l === 'ru') document.documentElement.setAttribute('lang', l);
     })();
   </script>
   <link rel="stylesheet" href="<?= h(Auth::basePath()) ?>/assets/css/app.css">
+  <script src="<?= h(Auth::basePath()) ?>/assets/js/i18n.js" defer></script>
   <script src="<?= h(Auth::basePath()) ?>/assets/js/app.js" defer></script>
 </head>
 <body data-base-path="<?= h(Auth::basePath()) ?>"
@@ -33,29 +36,40 @@
   <header class="top-menu" hidden aria-hidden="true"></header>
   <div class="shell">
     <nav class="nav-pane" id="nav-pane" aria-label="Console navigation">
-      <button type="button" class="nav-handle" id="nav-handle" aria-label="Toggle navigation" title="Navigation">
+      <button type="button" class="nav-handle" id="nav-handle" data-i18n-aria="nav.toggle" data-i18n-title="nav.toggle" aria-label="Toggle navigation" title="Navigation">
         <span class="nav-icon nav-icon--menu" aria-hidden="true"></span>
       </button>
       <ul class="nav-list">
         <li>
           <a href="<?= h(Auth::basePath()) ?>/?view=home"
              class="nav-link <?= ($view ?? '') === 'home' ? 'active' : '' ?>"
+             data-i18n-aria="nav.home" data-i18n-title="nav.home"
              aria-label="Home"
              title="Home">
             <span class="nav-icon nav-icon--home" aria-hidden="true"></span>
-            <span class="nav-label">Home</span>
+            <span class="nav-label" data-i18n="nav.home">Home</span>
           </a>
         </li>
         <li>
           <a href="<?= h(Auth::basePath()) ?>/?view=reports"
              class="nav-link <?= ($view ?? '') === 'reports' || ($view ?? '') === 'report' ? 'active' : '' ?>"
+             data-i18n-aria="nav.reports" data-i18n-title="nav.reports"
              aria-label="Reports"
              title="Reports">
             <span class="nav-icon nav-icon--reports" aria-hidden="true"></span>
-            <span class="nav-label">Reports</span>
+            <span class="nav-label" data-i18n="nav.reports">Reports</span>
           </a>
         </li>
       </ul>
+      <div class="nav-locale<?= ($view ?? '') === 'reports' ? ' nav-locale--toolbar-dup' : '' ?>">
+        <label class="toolbar-select toolbar-select--nav">
+          <span data-i18n="lang.label">Language</span>
+          <select class="lang-select" aria-label="Language">
+            <option value="en" data-i18n="lang.en">English</option>
+            <option value="ru" data-i18n="lang.ru">Russian</option>
+          </select>
+        </label>
+      </div>
       <div class="nav-user">
         <span class="nav-user-name" title="<?= h(Auth::user()['username'] ?? '') ?>">
           <span class="nav-icon nav-icon--user" aria-hidden="true"></span>
@@ -63,39 +77,47 @@
         </span>
         <a href="<?= h(Auth::basePath()) ?>/logout"
            class="nav-link nav-link--logout"
+           data-i18n-aria="nav.logout" data-i18n-title="nav.logout"
            aria-label="Logout"
            title="Logout">
           <span class="nav-icon nav-icon--logout" aria-hidden="true"></span>
-          <span class="nav-label">Logout</span>
+          <span class="nav-label" data-i18n="nav.logout">Logout</span>
         </a>
       </div>
     </nav>
     <main class="main-pane">
       <?php if (($view ?? 'home') === 'home'): ?>
-        <h1>Crash console</h1>
-        <p>Anonymous Android Cast crash ingest is active. Use <strong>Reports</strong> to analyze grouped fingerprints.</p>
+        <h1 data-i18n="home.title">Crash console</h1>
+        <p data-i18n="home.intro">Anonymous Android Cast crash ingest is active. Use <strong>Reports</strong> to analyze grouped fingerprints.</p>
         <ul>
-          <li>Upload API: <code><?= h(Auth::basePath()) ?>/api/upload.php</code></li>
-          <li>Schema: <code>schema_version: 1</code></li>
+          <li><span data-i18n="home.upload_api">Upload API:</span> <code><?= h(Auth::basePath()) ?>/api/upload.php</code></li>
+          <li><span data-i18n="home.schema">Schema:</span> <code>schema_version: 1</code></li>
         </ul>
       <?php elseif (($view ?? '') === 'report' && !empty($report)): ?>
         <?php require __DIR__ . '/report_detail.php'; ?>
       <?php elseif (($view ?? '') === 'reports'): ?>
         <div id="reports-app" class="reports-app" data-grouped="0">
           <div class="toolbar reports-toolbar">
-            <h1>Crash reports</h1>
+            <h1 data-i18n="reports.title">Crash reports</h1>
             <div class="toolbar-actions">
-              <button type="button" class="btn reports-mode-btn active" data-grouped="0">By time</button>
-              <button type="button" class="btn reports-mode-btn" data-grouped="1">Grouped</button>
+              <button type="button" class="btn reports-mode-btn active" data-grouped="0" data-i18n="reports.by_time">By time</button>
+              <button type="button" class="btn reports-mode-btn" data-grouped="1" data-i18n="reports.grouped">Grouped</button>
               <label class="toolbar-select">
-                Theme
-                <select id="theme-select" aria-label="UI theme">
-                  <option value="dark">Dark</option>
-                  <option value="light">Light</option>
+                <span data-i18n="lang.label">Language</span>
+                <select class="lang-select" id="lang-select" aria-label="Language" data-i18n-options="lang">
+                  <option value="en" data-i18n="lang.en">English</option>
+                  <option value="ru" data-i18n="lang.ru">Russian</option>
                 </select>
               </label>
               <label class="toolbar-select">
-                Per page
+                <span data-i18n="theme.label">Theme</span>
+                <select id="theme-select" aria-label="UI theme" data-i18n-options="theme">
+                  <option value="dark" data-i18n="theme.dark">Dark</option>
+                  <option value="light" data-i18n="theme.light">Light</option>
+                </select>
+              </label>
+              <label class="toolbar-select">
+                <span data-i18n="reports.per_page">Per page</span>
                 <select id="per-page-select" aria-label="Reports per page">
                   <option value="25">25</option>
                   <option value="50" selected>50</option>
@@ -108,15 +130,16 @@
           </div>
           <p id="reports-filter-banner" class="reports-filter-banner muted" hidden></p>
           <div class="reports-search-row">
-            <label class="reports-search-label" for="reports-search-input">Search</label>
+            <label class="reports-search-label" for="reports-search-input" data-i18n="reports.search">Search</label>
             <div class="reports-search-field">
               <input type="search" id="reports-search-input" class="reports-search-input"
+                     data-i18n-placeholder="reports.search_placeholder"
                      placeholder="Keywords (exceptions, devices, stack traces…)" autocomplete="off" spellcheck="false">
               <ul id="reports-search-suggest" class="reports-search-suggest" hidden role="listbox"></ul>
             </div>
-            <button type="button" class="btn" id="reports-search-clear" hidden>Clear</button>
+            <button type="button" class="btn" id="reports-search-clear" hidden data-i18n="reports.clear">Clear</button>
           </div>
-          <p id="reports-status" class="reports-status muted" aria-live="polite">Loading…</p>
+          <p id="reports-status" class="reports-status muted" aria-live="polite" data-i18n="reports.loading">Loading…</p>
           <div class="reports-table-wrap">
             <table class="data-table reports-tree reports-table--cols" id="reports-tree">
               <colgroup id="reports-colgroup"></colgroup>
@@ -134,19 +157,19 @@
     <div class="tag-modal-backdrop" data-tag-modal-close></div>
     <div class="tag-modal-panel" role="dialog" aria-labelledby="tag-modal-title">
       <header class="tag-modal-header">
-        <h2 id="tag-modal-title">Edit tags</h2>
-        <button type="button" class="tag-modal-close" data-tag-modal-close aria-label="Close">×</button>
+        <h2 id="tag-modal-title" data-i18n="tag.edit_title">Edit tags</h2>
+        <button type="button" class="tag-modal-close" data-tag-modal-close data-i18n-aria="tag.close" aria-label="Close">×</button>
       </header>
       <div class="tag-editor tag-editor--modal" id="tag-editor-modal" data-report-id="0">
         <div class="tag-editor-preview" id="tag-modal-preview"></div>
         <ul class="tag-editor-list" id="tag-modal-list"></ul>
         <form class="tag-editor-add" id="tag-modal-add">
-          <label class="tag-field"><span>Label</span><input type="text" name="label" maxlength="40" required></label>
-          <label class="tag-field"><span>Color</span><input type="color" name="bg" value="#5c6b82"></label>
-          <button type="submit" class="btn">Add</button>
+          <label class="tag-field"><span data-i18n="tag.label">Label</span><input type="text" name="label" maxlength="40" required></label>
+          <label class="tag-field"><span data-i18n="tag.color">Color</span><input type="color" name="bg" value="#5c6b82"></label>
+          <button type="submit" class="btn" data-i18n="tag.add">Add</button>
         </form>
         <div class="tag-preset-bar" id="tag-modal-presets" hidden>
-          <span class="muted">Suggestions:</span>
+          <span class="muted" data-i18n="tag.suggestions">Suggestions:</span>
           <div class="tag-preset-chips" id="tag-modal-preset-chips"></div>
         </div>
         <div class="tag-editor-actions">
@@ -157,6 +180,6 @@
     </div>
   </div>
   <?php endif; ?>
-  <footer class="bottom-bar">Android Cast crash reporter — placeholder footer</footer>
+  <footer class="bottom-bar" data-i18n="footer.copyright" data-year="<?= (int) date('Y') ?>">(c) Anton Afanaasyeu, <?= (int) date('Y') ?></footer>
 </body>
 </html>
diff --git a/examples/crash_reporter/backend/views/login.php b/examples/crash_reporter/backend/views/login.php
index c32be1f..1d119f2 100644
--- a/examples/crash_reporter/backend/views/login.php
+++ b/examples/crash_reporter/backend/views/login.php
@@ -10,6 +10,7 @@
  *    - Cursor Agent (project assistant)
  * Digest: SHA256	9bef983f4d34cb790922cda355ccf5d14b565b29273d2ebfe48b3173cd2e8f9f
  */
+$bp = Auth::basePath();
 ?>
 <!DOCTYPE html>
 <html lang="en">
@@ -17,20 +18,36 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Login — <?= h(cfg('app_name')) ?></title>
-  <link rel="stylesheet" href="<?= h(Auth::basePath()) ?>/assets/css/app.css">
+  <script>
+    (function () {
+      var l = localStorage.getItem('crash_console_lang');
+      if (l === 'en' || l === 'ru') document.documentElement.setAttribute('lang', l);
+    })();
+  </script>
+  <link rel="stylesheet" href="<?= h($bp) ?>/assets/css/app.css">
+  <script src="<?= h($bp) ?>/assets/js/i18n.js" defer></script>
 </head>
-<body class="login-page">
-  <form class="login-card" method="post" action="<?= h(Auth::basePath()) ?>/login">
+<body class="login-page" data-base-path="<?= h($bp) ?>">
+  <div class="login-locale">
+    <label class="toolbar-select">
+      <span data-i18n="lang.label">Language</span>
+      <select class="lang-select" aria-label="Language">
+        <option value="en" data-i18n="lang.en">English</option>
+        <option value="ru" data-i18n="lang.ru">Russian</option>
+      </select>
+    </label>
+  </div>
+  <form class="login-card" method="post" action="<?= h($bp) ?>/login">
     <h1><?= h(cfg('app_name')) ?></h1>
-    <p class="muted">Sign in to view anonymous crash reports</p>
+    <p class="muted" data-i18n="login.sign_in_hint">Sign in to view anonymous crash reports</p>
     <?php if (!empty($loginError)): ?>
-      <div class="alert"><?= h($loginError) ?></div>
+      <div class="alert" data-i18n="login.error"><?= h($loginError) ?></div>
     <?php endif; ?>
-    <label>Username<input name="username" autocomplete="username" required></label>
-    <label>Password<input name="password" type="password" autocomplete="current-password" required></label>
-    <button type="submit">Sign in</button>
-    <p class="hint">Default: admin / admin</p>
-    <p class="hint"><a href="#">Register</a> (coming soon)</p>
+    <label><span data-i18n="login.username">Username</span><input name="username" autocomplete="username" required></label>
+    <label><span data-i18n="login.password">Password</span><input name="password" type="password" autocomplete="current-password" required></label>
+    <button type="submit" data-i18n="login.submit">Sign in</button>
+    <p class="hint" data-i18n="login.hint_default">Default: admin / admin</p>
+    <p class="hint"><span data-i18n="login.register">Register</span> <span data-i18n="login.register_soon">(coming soon)</span></p>
   </form>
 </body>
 </html>
diff --git a/examples/crash_reporter/backend/views/report_detail.php b/examples/crash_reporter/backend/views/report_detail.php
index 55a44b1..a01bca8 100644
--- a/examples/crash_reporter/backend/views/report_detail.php
+++ b/examples/crash_reporter/backend/views/report_detail.php
@@ -34,36 +34,36 @@ if (!empty($device['abis']) && is_array($device['abis'])) {
 }
 ?>
 <div class="detail-header">
-  <a href="<?= h($bp) ?>/?view=reports" class="back-link" aria-label="Back to reports list" title="Back to list">
+  <a href="<?= h($bp) ?>/?view=reports" class="back-link" data-i18n-aria="detail.back" data-i18n-title="detail.back" aria-label="Back to reports list" title="Back to list">
     <span class="back-icon" aria-hidden="true"></span>
   </a>
   <div>
-    <h1>Crash report</h1>
-    <p class="muted">Report <?= h($report['report_id'] ?? '') ?> · <?= h($p['crash_type'] ?? '') ?></p>
+    <h1 data-i18n="detail.title">Crash report</h1>
+    <p class="muted" data-i18n="detail.report_meta" data-i18n-id="<?= h($report['report_id'] ?? '') ?>" data-i18n-type="<?= h($p['crash_type'] ?? '') ?>">Report <?= h($report['report_id'] ?? '') ?> · <?= h($p['crash_type'] ?? '') ?></p>
   </div>
 </div>
 
 <section class="tag-editor" id="tag-editor" data-report-id="<?= $reportDbId ?>">
   <div class="tag-editor-head">
-    <h2>Tags</h2>
-    <p class="muted tag-editor-hint">Auto tags (NDK / Java / Android / new) appear in the list. Add custom labels below.</p>
+    <h2 data-i18n="detail.tags">Tags</h2>
+    <p class="muted tag-editor-hint" data-i18n="tag.hint_auto">Auto tags (NDK / Java / Android / new) appear in the list. Add custom labels below.</p>
   </div>
   <div class="tag-editor-preview" id="tag-editor-preview" aria-live="polite"></div>
   <?php if (Auth::canEditTags()): ?>
   <ul class="tag-editor-list" id="tag-editor-list"></ul>
   <form class="tag-editor-add" id="tag-editor-add">
     <label class="tag-field">
-      <span>Label</span>
-      <input type="text" name="label" maxlength="40" required placeholder="e.g. regression">
+      <span data-i18n="tag.label">Label</span>
+      <input type="text" name="label" maxlength="40" required data-i18n-placeholder="tag.placeholder" placeholder="e.g. regression">
     </label>
     <label class="tag-field">
-      <span>Color</span>
+      <span data-i18n="tag.color">Color</span>
       <input type="color" name="bg" value="#5c6b82">
     </label>
-    <button type="submit" class="btn">Add tag</button>
+    <button type="submit" class="btn" data-i18n="tag.add_tag">Add tag</button>
   </form>
   <div class="tag-preset-bar" id="tag-preset-bar" hidden>
-    <span class="muted">Suggestions:</span>
+    <span class="muted" data-i18n="tag.suggestions">Suggestions:</span>
     <div class="tag-preset-chips" id="tag-preset-chips"></div>
   </div>
   <div class="tag-editor-actions">
@@ -71,7 +71,7 @@ if (!empty($device['abis']) && is_array($device['abis'])) {
     <span class="tag-editor-status muted" id="tag-editor-status"></span>
   </div>
   <?php else: ?>
-  <p class="muted">Sign in as admin to edit custom tags.</p>
+  <p class="muted" data-i18n="tag.hint_admin">Sign in as admin to edit custom tags.</p>
   <?php endif; ?>
 </section>
 <script type="application/json" id="report-custom-tags-data"><?=
@@ -80,12 +80,12 @@ if (!empty($device['abis']) && is_array($device['abis'])) {
 <div class="cards cards--lift">
   <div class="card card--lift"><h3>Device</h3>
     <?php if ($deviceName !== ''): ?>
-      <p><a class="detail-filter-link" href="<?= h($filterDeviceUrl) ?>" title="Show reports for similar devices"><?= h($deviceName) ?></a></p>
+      <p><a class="detail-filter-link detail-filter-link--tag" href="<?= h($filterDeviceUrl) ?>" title="Show reports for similar devices"><?= h($deviceName) ?></a></p>
     <?php else: ?>
       <p class="muted">—</p>
     <?php endif; ?>
     <?php if ($filterOsUrl !== ''): ?>
-      <p><a class="detail-filter-link" href="<?= h($filterOsUrl) ?>" title="Show reports on this OS">Android <?= h($release) ?> (SDK <?= $sdk ?>)</a></p>
+      <p><a class="detail-filter-link detail-filter-link--tag" href="<?= h($filterOsUrl) ?>" title="Show reports on this OS">Android <?= h($release) ?> (SDK <?= $sdk ?>)</a></p>
     <?php else: ?>
       <p>Android <?= h($release) ?> (SDK <?= $sdk ?>)</p>
     <?php endif; ?>
@@ -98,7 +98,7 @@ if (!empty($device['abis']) && is_array($device['abis'])) {
       </p>
     <?php endif; ?>
   </div>
-  <div class="card card--lift"><h3>App</h3>
+  <div class="card card--lift"><h3 data-i18n="detail.app">App</h3>
     <p><?= h($app['package'] ?? '') ?></p>
     <?php
     $versionName = (string) ($app['version_name'] ?? '');
@@ -107,7 +107,7 @@ if (!empty($device['abis']) && is_array($device['abis'])) {
         : '';
     ?>
     <?php if ($filterAppUrl !== ''): ?>
-      <p><a class="detail-filter-link" href="<?= h($filterAppUrl) ?>" title="Show reports for this app version">v<?= h($versionName) ?></a> (<?= h((string)($app['version_code'] ?? '')) ?>)</p>
+      <p><a class="detail-filter-link detail-filter-link--tag" href="<?= h($filterAppUrl) ?>" data-i18n-title="detail.filter_version" title="Show reports for this app version">v<?= h($versionName) ?></a> <span class="muted">(<?= h((string)($app['version_code'] ?? '')) ?>)</span></p>
     <?php else: ?>
       <p>v<?= h($versionName) ?> (<?= h((string)($app['version_code'] ?? '')) ?>)</p>
     <?php endif; ?>
@@ -119,9 +119,9 @@ if (!empty($device['abis']) && is_array($device['abis'])) {
           : '';
     ?>
       <?php if ($filterBuildUrl !== ''): ?>
-        <p class="muted">Build: <a class="detail-filter-link" href="<?= h($filterBuildUrl) ?>" title="Show reports from this build"><?= h($buildId) ?></a></p>
+        <p><span class="muted" data-i18n="detail.build">Build:</span> <a class="detail-filter-link detail-filter-link--tag" href="<?= h($filterBuildUrl) ?>" data-i18n-title="detail.filter_build" title="Show reports from this build"><?= h($buildId) ?></a></p>
       <?php else: ?>
-        <p class="muted">Build: <?= h($buildId) ?></p>
+        <p class="muted"><span data-i18n="detail.build">Build:</span> <?= h($buildId) ?></p>
       <?php endif; ?>
     <?php endif; ?>
   </div>
@@ -138,7 +138,7 @@ if (!empty($device['abis']) && is_array($device['abis'])) {
     <a class="btn btn-similar" href="<?= h($similarUrl) ?>">Find similar reports</a>
   </div>
   <p class="exc"><?= h($j['exception'] ?? '') ?><?= !empty($j['message']) ? ': ' . h($j['message']) : '' ?></p>
-  <p class="muted">Thread: <?= h($j['thread'] ?? '') ?></p>
+  <p class="muted"><span data-i18n="detail.thread">Thread:</span> <?= h($j['thread'] ?? '') ?></p>
   <pre class="stack"><?php foreach ($j['stack_frames'] ?? [] as $frame) { echo h((string)$frame) . "\n"; } ?></pre>
 </section>
 <?php endif; ?>
@@ -176,7 +176,7 @@ if (!empty($device['abis']) && is_array($device['abis'])) {
           <span class="report-tree-arrow" aria-hidden="true"></span>
         </button>
       </span>
-      <span class="detail-tree-caption">Raw JSON</span>
+      <span class="detail-tree-caption" data-i18n="detail.raw_json">Raw JSON</span>
     </div>
     <div class="detail-tree-body" id="detail-raw-json" hidden>
       <pre class="stack raw-json"><?= h($rawJson) ?></pre>