feat: Receiver OOP hierarchy with per-receiver locale resolution

- Introduce Receiver base class + typed subclasses (TelegramReceiver,
  WebhookReceiver, EmailReceiver, etc.) in core/notifications/receiver.py
- Dispatcher uses typed Receiver objects instead of raw dicts, with
  per-receiver locale-aware template rendering
- load_link_data resolves locale from TelegramChat.language_override at
  load time: TargetReceiver.locale || chat.language_override || chat.language_code
- Add language_override field to TelegramChat (separate from auto-detected
  language_code), with per-chat commands toggle and command dispatch using
  override language
- Add locale field to TargetReceiver for explicit per-receiver overrides

CLAUDE.md

@@ -17,3 +17,10 @@ Detailed context is split into focused documents under `.claude/docs/`. Read the
 3. **Template variables** must be updated in 6 files simultaneously — see [template-system.md](.claude/docs/template-system.md).
 4. **Entity cache** — shared entities use `$state`-based caches in `frontend/src/lib/stores/caches.svelte.ts`. Always use cache for cross-page data; invalidate after mutations — see [frontend-architecture.md](.claude/docs/frontend-architecture.md).
 5. **Telegram API** — ALL Telegram Bot API calls (sendMessage, sendPhoto, sendMediaGroup, etc.) MUST go through `TelegramClient` in `packages/core/src/notify_bridge_core/notifications/telegram/client.py`. NEVER duplicate sending logic in command handlers, API routes, or services. If `TelegramClient` lacks a method you need, add it there.
+6. **Service provider defaults** — when implementing a new service provider, ALWAYS create default notification and command templates and configs. This requires changes across all of these locations:
+   - Jinja2 notification templates for each locale in `packages/core/src/notify_bridge_core/templates/defaults/{en,ru}/`
+   - Jinja2 command templates for each locale in `packages/core/src/notify_bridge_core/templates/command_defaults/{en,ru}/{provider}/`
+   - Notification slot mapping in `packages/core/src/notify_bridge_core/templates/defaults/loader.py` (`PROVIDER_SLOT_FILE_MAP`)
+   - Command slot mapping in `packages/core/src/notify_bridge_core/templates/command_defaults/loader.py` (`PROVIDER_COMMAND_SLOTS`)
+   - Provider capabilities in `packages/core/src/notify_bridge_core/providers/capabilities.py`
+   - Seed functions in `packages/server/src/notify_bridge_server/database/seeds.py` (notification templates, command templates, tracking configs, command configs)

frontend/src/lib/i18n/en.json

@@ -338,6 +338,7 @@
 		"chatName": "Name",
 		"chatType": "Type",
 		"chatLang": "Lang",
+		"langOverride": "Override",
 		"cmds": "Cmds",
 		"commandsToggle": "Toggle command listening for this chat",
 		"chatId": "Chat ID",

frontend/src/lib/i18n/ru.json

@@ -338,6 +338,7 @@
 		"chatName": "Имя",
 		"chatType": "Тип",
 		"chatLang": "Язык",
+		"langOverride": "Переопр.",
 		"cmds": "Команды",
 		"commandsToggle": "Включить/выключить команды для этого чата",
 		"chatId": "ID чата",

frontend/src/lib/types.ts

@@ -52,6 +52,7 @@ export interface TelegramChat {
 	type: string;
 	username: string;
 	language_code?: string;
+	language_override?: string;
 	commands_enabled: boolean;
 	discovered_at: string;
 }

frontend/src/routes/bots/TelegramBotTab.svelte

@@ -129,10 +129,10 @@
 		try {
 			await api(`/telegram-bots/${botId}/chats/${chat.id}`, {
 				method: 'PUT',
-				body: JSON.stringify({ language_code: lang }),
+				body: JSON.stringify({ language_override: lang }),
 			});
 			chats[botId] = (chats[botId] || []).map(c =>
-				c.id === chat.id ? { ...c, language_code: lang } : c
+				c.id === chat.id ? { ...c, language_override: lang } : c
 			);
 			snackSuccess(t('telegramBot.languageUpdated'));
 		} catch (err: any) { snackError(err.message); }
@@ -362,13 +362,14 @@
 						{:else if (chats[bot.id] || []).length === 0}
 							<p class="text-xs text-[var(--color-muted-foreground)]">{t('telegramBot.noChats')}</p>
 						{:else}
-							{@const gridStyle = "display:grid; grid-template-columns:1fr 80px 100px 50px 130px 60px; align-items:center; gap:0.5rem;"}
+							{@const gridStyle = "display:grid; grid-template-columns:1fr 80px 40px 100px 50px 130px 60px; align-items:center; gap:0.5rem;"}
 							<!-- Header -->
 							<div style="{gridStyle} padding:0.25rem 0.5rem; border-bottom:1px solid var(--color-border);"
 								class="text-[0.65rem] font-semibold uppercase tracking-wide text-[var(--color-muted-foreground)]">
 								<span>{t('telegramBot.chatName')}</span>
 								<span style="text-align:center">{t('telegramBot.chatType')}</span>
 								<span style="text-align:center">{t('telegramBot.chatLang')}</span>
+								<span style="text-align:center">{t('telegramBot.langOverride')}</span>
 								<span style="text-align:center">{t('telegramBot.cmds')}</span>
 								<span style="text-align:center">{t('telegramBot.chatId')}</span>
 								<span></span>
@@ -382,10 +383,11 @@
 									role="button" tabindex="0">
 									<span class="font-medium truncate">{chat.title || chat.username || 'Unknown'}</span>
 									<span style="text-align:center" class="text-xs px-1.5 py-0.5 rounded bg-[var(--color-muted)] text-[var(--color-muted-foreground)]">{chatTypeLabel(chat.type)}</span>
+									<span style="text-align:center" class="text-xs text-[var(--color-muted-foreground)]">{(chat.language_code || '—').toUpperCase()}</span>
 									<div style="justify-self:center" onclick={(e: MouseEvent) => e.stopPropagation()}>
 										<EntitySelect
 											items={LANG_ITEMS}
-											value={chat.language_code || ''}
+											value={chat.language_override || ''}
 											size="sm"
 											onselect={(val) => updateChatLanguage(bot.id, chat, String(val ?? ''))}
 										/>

packages/core/src/notify_bridge_core/notifications/dispatcher.py

@@ -12,6 +12,16 @@ from notify_bridge_core.models.events import ServiceEvent
 from notify_bridge_core.templates.context import build_template_context
 from notify_bridge_core.templates.renderer import render_template
 
+from .receiver import (
+    Receiver,
+    TelegramReceiver,
+    WebhookReceiver,
+    EmailReceiver,
+    DiscordReceiver,
+    SlackReceiver,
+    NtfyReceiver,
+    MatrixReceiver,
+)
 from .telegram.cache import TelegramFileCache
 from .telegram.client import TelegramClient
 from .webhook.client import WebhookClient
@@ -28,14 +38,13 @@ class TargetConfig:
     type: str  # "telegram", "webhook", "email", "discord", "slack", "ntfy", "matrix"
     config: dict[str, Any]  # target-level config (bot_token, settings, etc.)
     template_slots: dict[str, dict[str, str]] | None = None  # event_type -> {locale -> template}
-    locale: str = "en"  # preferred locale for template resolution
+    locale: str = "en"  # default locale for template resolution
     date_format: str = "%d.%m.%Y, %H:%M UTC"
     date_only_format: str = "%d.%m.%Y"
     provider_api_key: str | None = None  # API key for downloading assets from provider
     provider_internal_url: str | None = None  # Internal provider URL for API key scoping
     provider_external_url: str | None = None  # External domain for API key scoping
-    # Broadcast receivers — if non-empty, sends to each receiver instead of config
+    receivers: list[Receiver] = field(default_factory=list)
-    receivers: list[dict[str, Any]] = field(default_factory=list)
 
 
 class NotificationDispatcher:
@@ -69,24 +78,43 @@ class NotificationDispatcher:
                 results.append({"success": False, "error": str(e)})
         return results
 
-    async def _send_to_target(
+    def _resolve_template(
-        self, event: ServiceEvent, target: TargetConfig
+        self, event: ServiceEvent, target: TargetConfig, locale: str,
-    ) -> dict[str, Any]:
+    ) -> str:
-        """Send event to a single target (potentially multiple receivers)."""
+        """Resolve template string for an event, with locale fallback."""
-        # Select template with locale fallback
         template_str = DEFAULT_TEMPLATE
         if target.template_slots:
             locale_map = target.template_slots.get(event.event_type.value)
             if locale_map:
-                template_str = locale_map.get(target.locale) or locale_map.get("en") or template_str
+                template_str = locale_map.get(locale) or locale_map.get("en") or template_str
+        return template_str
 
-        # Build context and render ONCE
+    def _render_message(
+        self, event: ServiceEvent, target: TargetConfig, locale: str,
+    ) -> str:
+        """Resolve template and render message for a given locale."""
+        template_str = self._resolve_template(event, target, locale)
         ctx = build_template_context(
             event, target_type=target.type,
             date_format=target.date_format,
             date_only_format=target.date_only_format,
         )
-        message = render_template(template_str, ctx)
+        return render_template(template_str, ctx)
+
+    def _message_for_receiver(
+        self, receiver: Receiver, default_message: str,
+        event: ServiceEvent, target: TargetConfig,
+    ) -> str:
+        """Return per-receiver message, re-rendering if receiver has a different locale."""
+        if receiver.locale and receiver.locale != target.locale:
+            return self._render_message(event, target, receiver.locale)
+        return default_message
+
+    async def _send_to_target(
+        self, event: ServiceEvent, target: TargetConfig
+    ) -> dict[str, Any]:
+        """Send event to a single target (potentially multiple receivers)."""
+        default_message = self._render_message(event, target, target.locale)
 
         send_method = {
             "telegram": self._send_telegram,
@@ -98,11 +126,11 @@ class NotificationDispatcher:
             "matrix": self._send_matrix,
         }.get(target.type)
         if send_method:
-            return await send_method(target, message, event)
+            return await send_method(target, default_message, event)
         return {"success": False, "error": f"Unknown target type: {target.type}"}
 
     async def _send_telegram(
-        self, target: TargetConfig, message: str, event: ServiceEvent
+        self, target: TargetConfig, default_message: str, event: ServiceEvent
     ) -> dict[str, Any]:
         bot_token = target.config.get("bot_token")
         disable_preview = target.config.get("disable_url_preview", False)
@@ -120,7 +148,6 @@ class NotificationDispatcher:
 
         if not target.receivers:
             return {"success": False, "error": "No receivers configured"}
-        receivers = target.receivers
 
         # Prepare assets list once (shared across receivers)
         provider_urls = []
@@ -146,28 +173,27 @@ class NotificationDispatcher:
                 asset_cache=self._asset_cache,
             )
 
-            for receiver in receivers:
+            for receiver in target.receivers:
-                chat_id = receiver.get("chat_id")
+                if not isinstance(receiver, TelegramReceiver) or not receiver.chat_id:
-                if not chat_id:
+                    results.append({"success": False, "error": "Invalid telegram receiver"})
-                    results.append({"success": False, "error": "Missing chat_id in receiver"})
                     continue
 
-                # Step 1: Send the text message
+                message = self._message_for_receiver(receiver, default_message, event, target)
+
                 text_result = await client.send_message(
-                    chat_id=str(chat_id),
+                    chat_id=receiver.chat_id,
                     text=message,
                     disable_web_page_preview=bool(disable_preview),
                 )
                 if not text_result.get("success"):
-                    _LOGGER.warning("Failed to send to chat %s: %s", chat_id, text_result.get("error"))
+                    _LOGGER.warning("Failed to send to chat %s: %s", receiver.chat_id, text_result.get("error"))
                     results.append(text_result)
                     continue
 
-                # Step 2: Send assets as reply
                 if assets:
                     reply_to = text_result.get("message_id")
                     media_result = await client.send_notification(
-                        chat_id=str(chat_id),
+                        chat_id=receiver.chat_id,
                         assets=assets,
                         reply_to_message_id=reply_to,
                         max_group_size=max_group,
@@ -177,19 +203,25 @@ class NotificationDispatcher:
                         chat_action=chat_action or None,
                     )
                     if not media_result.get("success"):
-                        _LOGGER.warning("Text sent OK but media failed for chat %s: %s", chat_id, media_result.get("error"))
+                        _LOGGER.warning("Text sent OK but media failed for chat %s: %s", receiver.chat_id, media_result.get("error"))
 
                 results.append(text_result)
 
         return self._aggregate_results(results)
 
     async def _send_webhook(
-        self, target: TargetConfig, message: str, event: ServiceEvent
+        self, target: TargetConfig, default_message: str, event: ServiceEvent
     ) -> dict[str, Any]:
         if not target.receivers:
             return {"success": False, "error": "No receivers configured"}
-        receivers = target.receivers
 
+        results: list[dict[str, Any]] = []
+        async with aiohttp.ClientSession() as session:
+            for receiver in target.receivers:
+                if not isinstance(receiver, WebhookReceiver) or not receiver.url:
+                    results.append({"success": False, "error": "Invalid webhook receiver"})
+                    continue
+                message = self._message_for_receiver(receiver, default_message, event, target)
                 payload = {
                     "message": message,
                     "event_type": event.event_type.value,
@@ -198,22 +230,13 @@ class NotificationDispatcher:
                     "collection_id": event.collection_id,
                     "timestamp": event.timestamp.isoformat(),
                 }
-
+                client = WebhookClient(session, receiver.url, receiver.headers)
-        results: list[dict[str, Any]] = []
-        async with aiohttp.ClientSession() as session:
-            for receiver in receivers:
-                url = receiver.get("url")
-                headers = receiver.get("headers", {})
-                if not url:
-                    results.append({"success": False, "error": "Missing url in receiver"})
-                    continue
-                client = WebhookClient(session, url, headers)
                 results.append(await client.send(payload))
 
         return self._aggregate_results(results)
 
     async def _send_email(
-        self, target: TargetConfig, message: str, event: ServiceEvent
+        self, target: TargetConfig, default_message: str, event: ServiceEvent
     ) -> dict[str, Any]:
         from .email.client import EmailClient, SmtpConfig
 
@@ -233,71 +256,68 @@ class NotificationDispatcher:
 
         if not target.receivers:
             return {"success": False, "error": "No receivers configured"}
-        receivers = target.receivers
         subject = f"[Notify Bridge] {event.event_type.value}: {event.collection_name}"
 
         results: list[dict[str, Any]] = []
-        for receiver in receivers:
+        for receiver in target.receivers:
-            email = receiver.get("email")
+            if not isinstance(receiver, EmailReceiver) or not receiver.email:
-            if not email:
+                results.append({"success": False, "error": "Invalid email receiver"})
-                results.append({"success": False, "error": "Missing email in receiver"})
                 continue
+            message = self._message_for_receiver(receiver, default_message, event, target)
             result = await client.send(
-                to_email=email,
+                to_email=receiver.email,
                 subject=subject,
                 body_text=message,
-                to_name=receiver.get("name", ""),
+                to_name=receiver.name,
             )
             results.append(result)
 
         return self._aggregate_results(results)
 
     async def _send_discord(
-        self, target: TargetConfig, message: str, event: ServiceEvent
+        self, target: TargetConfig, default_message: str, event: ServiceEvent
     ) -> dict[str, Any]:
         from .discord.client import DiscordClient
 
         if not target.receivers:
             return {"success": False, "error": "No receivers configured"}
-        receivers = target.receivers
         username = target.config.get("username")
 
         results: list[dict[str, Any]] = []
         async with aiohttp.ClientSession() as session:
             client = DiscordClient(session)
-            for receiver in receivers:
+            for receiver in target.receivers:
-                webhook_url = receiver.get("webhook_url")
+                if not isinstance(receiver, DiscordReceiver) or not receiver.webhook_url:
-                if not webhook_url:
+                    results.append({"success": False, "error": "Invalid discord receiver"})
-                    results.append({"success": False, "error": "Missing webhook_url"})
                     continue
-                results.append(await client.send(webhook_url, message, username=username))
+                message = self._message_for_receiver(receiver, default_message, event, target)
+                results.append(await client.send(receiver.webhook_url, message, username=username))
 
         return self._aggregate_results(results)
 
     async def _send_slack(
-        self, target: TargetConfig, message: str, event: ServiceEvent
+        self, target: TargetConfig, default_message: str, event: ServiceEvent
     ) -> dict[str, Any]:
         from .slack.client import SlackClient
 
         if not target.receivers:
             return {"success": False, "error": "No receivers configured"}
-        receivers = target.receivers
         username = target.config.get("username")
 
         results: list[dict[str, Any]] = []
         async with aiohttp.ClientSession() as session:
             client = SlackClient(session)
-            for receiver in receivers:
+            for receiver in target.receivers:
-                webhook_url = receiver.get("webhook_url")
+                if not isinstance(receiver, SlackReceiver) or not receiver.webhook_url:
-                if not webhook_url:
+                    results.append({"success": False, "error": "Invalid slack receiver"})
-                    results.append({"success": False, "error": "Missing webhook_url"})
                     continue
-                results.append(await client.send(webhook_url, message, username=username))
+                message = self._message_for_receiver(receiver, default_message, event, target)
+                results.append(await client.send(receiver.webhook_url, message, username=username))
 
         return self._aggregate_results(results)
 
     async def _send_ntfy(
-        self, target: TargetConfig, message: str, event: ServiceEvent
+        self, target: TargetConfig, default_message: str, event: ServiceEvent
     ) -> dict[str, Any]:
         from .ntfy.client import NtfyClient
 
@@ -305,28 +325,26 @@ class NotificationDispatcher:
         auth_token = target.config.get("auth_token")
         if not target.receivers:
             return {"success": False, "error": "No receivers configured"}
-        receivers = target.receivers
 
         title = f"{event.event_type.value}: {event.collection_name}"
 
         results: list[dict[str, Any]] = []
         async with aiohttp.ClientSession() as session:
             client = NtfyClient(session)
-            for receiver in receivers:
+            for receiver in target.receivers:
-                topic = receiver.get("topic")
+                if not isinstance(receiver, NtfyReceiver) or not receiver.topic:
-                if not topic:
+                    results.append({"success": False, "error": "Invalid ntfy receiver"})
-                    results.append({"success": False, "error": "Missing topic"})
                     continue
-                priority = receiver.get("priority", 3)
+                message = self._message_for_receiver(receiver, default_message, event, target)
                 results.append(await client.send(
-                    server_url, topic, message,
+                    server_url, receiver.topic, message,
-                    title=title, priority=priority, auth_token=auth_token,
+                    title=title, priority=receiver.priority, auth_token=auth_token,
                 ))
 
         return self._aggregate_results(results)
 
     async def _send_matrix(
-        self, target: TargetConfig, message: str, event: ServiceEvent
+        self, target: TargetConfig, default_message: str, event: ServiceEvent
     ) -> dict[str, Any]:
         from .matrix.client import MatrixClient
 
@@ -337,18 +355,17 @@ class NotificationDispatcher:
 
         if not target.receivers:
             return {"success": False, "error": "No receivers configured"}
-        receivers = target.receivers
 
         results: list[dict[str, Any]] = []
         async with aiohttp.ClientSession() as session:
             client = MatrixClient(session, homeserver, access_token)
-            for receiver in receivers:
+            for receiver in target.receivers:
-                room_id = receiver.get("room_id")
+                if not isinstance(receiver, MatrixReceiver) or not receiver.room_id:
-                if not room_id:
+                    results.append({"success": False, "error": "Invalid matrix receiver"})
-                    results.append({"success": False, "error": "Missing room_id"})
                     continue
+                message = self._message_for_receiver(receiver, default_message, event, target)
                 results.append(await client.send_message(
-                    room_id, message, html_message=message,
+                    receiver.room_id, message, html_message=message,
                 ))
 
         return self._aggregate_results(results)

packages/core/src/notify_bridge_core/notifications/receiver.py

@@ -0,0 +1,120 @@
+"""Receiver hierarchy — typed delivery endpoints with locale resolution."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass
+class Receiver:
+    """Base receiver with locale and raw config."""
+
+    locale: str = ""
+    config: dict[str, Any] = field(default_factory=dict)
+
+    def to_dict(self) -> dict[str, Any]:
+        """Return raw dict for backward compat (includes locale)."""
+        return {**self.config, "locale": self.locale}
+
+
+@dataclass
+class TelegramReceiver(Receiver):
+    """Telegram chat receiver."""
+
+    chat_id: str = ""
+
+
+@dataclass
+class WebhookReceiver(Receiver):
+    """Webhook URL receiver."""
+
+    url: str = ""
+    headers: dict[str, str] = field(default_factory=dict)
+
+
+@dataclass
+class EmailReceiver(Receiver):
+    """Email receiver."""
+
+    email: str = ""
+    name: str = ""
+
+
+@dataclass
+class DiscordReceiver(Receiver):
+    """Discord webhook receiver."""
+
+    webhook_url: str = ""
+
+
+@dataclass
+class SlackReceiver(Receiver):
+    """Slack webhook receiver."""
+
+    webhook_url: str = ""
+
+
+@dataclass
+class NtfyReceiver(Receiver):
+    """ntfy topic receiver."""
+
+    topic: str = ""
+    priority: int = 3
+
+
+@dataclass
+class MatrixReceiver(Receiver):
+    """Matrix room receiver."""
+
+    room_id: str = ""
+
+
+def build_receiver(target_type: str, config: dict[str, Any], locale: str = "") -> Receiver:
+    """Factory: build typed Receiver from target type and config dict."""
+    if target_type == "telegram":
+        return TelegramReceiver(
+            locale=locale,
+            config=config,
+            chat_id=str(config.get("chat_id", "")),
+        )
+    if target_type == "webhook":
+        return WebhookReceiver(
+            locale=locale,
+            config=config,
+            url=config.get("url", ""),
+            headers=config.get("headers", {}),
+        )
+    if target_type == "email":
+        return EmailReceiver(
+            locale=locale,
+            config=config,
+            email=config.get("email", ""),
+            name=config.get("name", ""),
+        )
+    if target_type == "discord":
+        return DiscordReceiver(
+            locale=locale,
+            config=config,
+            webhook_url=config.get("webhook_url", ""),
+        )
+    if target_type == "slack":
+        return SlackReceiver(
+            locale=locale,
+            config=config,
+            webhook_url=config.get("webhook_url", ""),
+        )
+    if target_type == "ntfy":
+        return NtfyReceiver(
+            locale=locale,
+            config=config,
+            topic=config.get("topic", ""),
+            priority=config.get("priority", 3),
+        )
+    if target_type == "matrix":
+        return MatrixReceiver(
+            locale=locale,
+            config=config,
+            room_id=config.get("room_id", ""),
+        )
+    return Receiver(locale=locale, config=config)

packages/server/src/notify_bridge_server/api/notification_tracker_targets.py

@@ -15,6 +15,7 @@ from ..database.models import (
     NotificationTracker,
     NotificationTrackerTarget,
     ServiceProvider,
+    TargetReceiver,
     TemplateConfig,
     TemplateSlot,
     TrackingConfig,
@@ -206,8 +207,39 @@ async def test_notification_tracker_target(
     if not target:
         raise HTTPException(status_code=404, detail="Target not found")
 
+    # Resolve effective locale from first receiver (explicit locale → TelegramChat lang)
+    effective_locale = locale
+    recv_result = await session.exec(
+        select(TargetReceiver).where(
+            TargetReceiver.target_id == target.id,
+            TargetReceiver.enabled == True,
+        )
+    )
+    first_recv = recv_result.first()
+    if first_recv:
+        recv_locale = getattr(first_recv, 'locale', '') or ''
+        if not recv_locale and target.type == "telegram":
+            # Resolve from TelegramChat language_override/language_code
+            from ..database.models import TelegramBot, TelegramChat
+            chat_id = str(first_recv.config.get("chat_id", ""))
+            bot_id = target.config.get("bot_id")
+            if chat_id and bot_id:
+                chat_row = (await session.exec(
+                    select(TelegramChat).where(
+                        TelegramChat.bot_id == bot_id,
+                        TelegramChat.chat_id == chat_id,
+                    )
+                )).first()
+                if chat_row:
+                    recv_locale = (
+                        getattr(chat_row, 'language_override', '') or
+                        getattr(chat_row, 'language_code', '') or ''
+                    )
+        if recv_locale:
+            effective_locale = recv_locale[:2].lower()
+
     if test_type == "basic":
-        r = await send_test_notification(target, locale=locale)
+        r = await send_test_notification(target, locale=effective_locale)
         return {"target": target.name, **r}
 
     # For periodic/scheduled/memory — fetch real data from provider
@@ -226,7 +258,7 @@ async def test_notification_tracker_target(
                 select(TemplateSlot).where(
                     TemplateSlot.config_id == template_config.id,
                     TemplateSlot.slot_name == slot_name,
-                    TemplateSlot.locale == "en",
+                    TemplateSlot.locale == effective_locale,
                 )
             )
             slot = slot_result.first()

packages/server/src/notify_bridge_server/api/target_receivers.py

@@ -21,12 +21,14 @@ router = APIRouter(prefix="/api/targets/{target_id}/receivers", tags=["target-re
 class ReceiverCreate(BaseModel):
     name: str = ""
     config: dict[str, Any] = {}
+    locale: str = ""
     enabled: bool = True
 
 
 class ReceiverUpdate(BaseModel):
     name: str | None = None
     config: dict[str, Any] | None = None
+    locale: str | None = None
     enabled: bool | None = None
 
 
@@ -85,6 +87,7 @@ async def create_receiver(
         name=body.name,
         config=body.config,
         receiver_key=key,
+        locale=body.locale,
         enabled=body.enabled,
     )
     session.add(receiver)
@@ -133,7 +136,8 @@ async def test_receiver(
         raise HTTPException(status_code=404, detail="Receiver not found")
 
     from ..services.notifier import _get_test_message
-    message = _get_test_message(locale, target.type)
+    effective_locale = getattr(receiver, 'locale', '') or locale
+    message = _get_test_message(effective_locale, target.type)
     return await send_to_receiver(target, dict(receiver.config), message)
 
 
@@ -159,6 +163,7 @@ def _response(r: TargetReceiver) -> dict:
         "name": r.name,
         "config": dict(r.config),
         "receiver_key": r.receiver_key,
+        "locale": getattr(r, 'locale', '') or '',
         "enabled": r.enabled,
         "created_at": r.created_at.isoformat(),
     }

packages/server/src/notify_bridge_server/api/targets.py

@@ -107,7 +107,7 @@ async def list_targets(
                     chat = chat_result.first()
                     if chat:
                         chat_names[f"{bot_id}_{chat_id}"] = chat.title or chat.username or ""
-                        lang = getattr(chat, 'language_code', '') or ''
+                        lang = getattr(chat, 'language_override', '') or getattr(chat, 'language_code', '') or ''
                         if lang:
                             chat_languages[f"{bot_id}_{chat_id}"] = lang
 
@@ -278,6 +278,7 @@ def _target_response(
                 "name": r.name,
                 "config": dict(r.config),
                 "receiver_key": r.receiver_key,
+                "locale": getattr(r, 'locale', '') or '',
                 "enabled": r.enabled,
             }
             for r in recv_list

packages/server/src/notify_bridge_server/api/telegram_bots.py

@@ -15,7 +15,7 @@ from ..auth.dependencies import get_current_user
 from ..commands.handler import register_commands_with_telegram
 from ..commands.webhook import register_webhook, unregister_webhook
 from ..database.engine import get_session
-from ..database.models import AppSetting, TelegramBot, TelegramChat, User
+from ..database.models import AppSetting, NotificationTarget, TargetReceiver, TelegramBot, TelegramChat, User
 from ..services.notifier import _get_test_message
 from ..services.telegram_poller import schedule_bot_polling, unschedule_bot_polling
 from .app_settings import get_setting
@@ -297,7 +297,7 @@ async def test_chat(
 
 
 class ChatUpdate(BaseModel):
-    language_code: str | None = None
+    language_override: str | None = None
     title: str | None = None
     commands_enabled: bool | None = None
 
@@ -389,6 +389,7 @@ def _chat_response(c: TelegramChat) -> dict:
         "type": c.chat_type,
         "username": c.username,
         "language_code": getattr(c, 'language_code', '') or '',
+        "language_override": getattr(c, 'language_override', '') or '',
         "commands_enabled": getattr(c, 'commands_enabled', False),
         "discovered_at": c.discovered_at.isoformat(),
     }

packages/server/src/notify_bridge_server/commands/webhook.py

@@ -86,8 +86,9 @@ async def telegram_webhook(
         )).first()
         if not chat_row or not chat_row.commands_enabled:
             return {"ok": True, "skipped": "commands_disabled"}
+        effective_lang = chat_row.language_override or msg_language
         message_id = message.get("message_id")
-        cmd_response = await handle_command(bot, chat_id, text, language_code=msg_language)
+        cmd_response = await handle_command(bot, chat_id, text, language_code=effective_lang)
         if cmd_response is not None:
             if isinstance(cmd_response, list):
                 await send_media_group(bot.token, chat_id, cmd_response, reply_to_message_id=message_id)

packages/server/src/notify_bridge_server/database/migrations.py

@@ -207,6 +207,21 @@ async def migrate_schema(engine: AsyncEngine) -> None:
                 )
                 logger.info("Added language_code column to telegram_chat table")
 
+            # Add language_override to telegram_chat if missing
+            if not await _has_column(conn, "telegram_chat", "language_override"):
+                await conn.execute(
+                    text("ALTER TABLE telegram_chat ADD COLUMN language_override TEXT DEFAULT ''")
+                )
+                logger.info("Added language_override column to telegram_chat table")
+
+        # Add locale to target_receiver if missing
+        if await _has_table(conn, "target_receiver"):
+            if not await _has_column(conn, "target_receiver", "locale"):
+                await conn.execute(
+                    text("ALTER TABLE target_receiver ADD COLUMN locale TEXT DEFAULT ''")
+                )
+                logger.info("Added locale column to target_receiver table")
+
             # Add commands_enabled to telegram_chat if missing (default disabled)
             if not await _has_column(conn, "telegram_chat", "commands_enabled"):
                 await conn.execute(

packages/server/src/notify_bridge_server/database/models.py

@@ -95,7 +95,8 @@ class TelegramChat(SQLModel, table=True):
     title: str = Field(default="")
     chat_type: str = Field(default="private")
     username: str = Field(default="")
-    language_code: str = Field(default="")
+    language_code: str = Field(default="")  # auto-detected from Telegram
+    language_override: str = Field(default="")  # manual override set by user
     commands_enabled: bool = Field(default=False)
     discovered_at: datetime = Field(default_factory=_utcnow)
 
@@ -279,6 +280,7 @@ class TargetReceiver(SQLModel, table=True):
     name: str = Field(default="")
     config: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
     receiver_key: str = Field(default="")  # dedup key (e.g. chat_id, url, email)
+    locale: str = Field(default="")  # e.g. "en", "ru"; empty = use target default
     enabled: bool = Field(default=True)
     created_at: datetime = Field(default_factory=_utcnow)
 

packages/server/src/notify_bridge_server/services/dispatch_helpers.py

@@ -10,6 +10,7 @@ from sqlmodel import select
 from sqlmodel.ext.asyncio.session import AsyncSession
 
 from notify_bridge_core.models.events import ServiceEvent
+from notify_bridge_core.notifications.receiver import Receiver, build_receiver
 
 from ..database.models import (
     EmailBot,
@@ -17,6 +18,8 @@ from ..database.models import (
     NotificationTarget,
     NotificationTrackerTarget,
     TargetReceiver,
+    TelegramBot,
+    TelegramChat,
     TemplateConfig,
     TemplateSlot,
     TrackingConfig,
@@ -115,14 +118,44 @@ async def load_link_data(
         if not target:
             continue
 
-        # Load receivers
+        # Load receivers as typed Receiver objects
         recv_result = await session.exec(
             select(TargetReceiver).where(
                 TargetReceiver.target_id == target.id,
                 TargetReceiver.enabled == True,
             )
         )
-        receivers = [dict(r.config) for r in recv_result.all()]
+        recv_rows = recv_result.all()
+
+        # For Telegram targets, resolve locale from TelegramChat
+        chat_locale_map: dict[str, str] = {}
+        if target.type == "telegram":
+            bot_id = target.config.get("bot_id")
+            if bot_id:
+                chat_ids = [str(r.config.get("chat_id", "")) for r in recv_rows if r.config.get("chat_id")]
+                if chat_ids:
+                    chat_result = await session.exec(
+                        select(TelegramChat).where(
+                            TelegramChat.bot_id == bot_id,
+                            TelegramChat.chat_id.in_(chat_ids),
+                        )
+                    )
+                    for chat in chat_result.all():
+                        resolved = (
+                            getattr(chat, 'language_override', '') or
+                            getattr(chat, 'language_code', '') or ''
+                        )
+                        if resolved:
+                            chat_locale_map[chat.chat_id] = resolved[:2].lower()
+
+        receivers: list[Receiver] = []
+        for r in recv_rows:
+            explicit_locale = getattr(r, 'locale', '') or ''
+            locale = explicit_locale
+            if not locale and target.type == "telegram":
+                chat_id = str(r.config.get("chat_id", ""))
+                locale = chat_locale_map.get(chat_id, "")
+            receivers.append(build_receiver(target.type, dict(r.config), locale))
 
         tracking_config = None
         if tt.tracking_config_id:

packages/server/src/notify_bridge_server/services/telegram_poller.py

@@ -207,8 +207,9 @@ async def _poll_bot(bot_id: int) -> None:
                     )).first()
                     if not chat_row or not chat_row.commands_enabled:
                         continue
+                    effective_lang = chat_row.language_override or msg_language
                 message_id = message.get("message_id")
-                cmd_response = await handle_command(bot_obj, chat_id, text, language_code=msg_language)
+                cmd_response = await handle_command(bot_obj, chat_id, text, language_code=effective_lang)
                 if cmd_response is not None:
                     if isinstance(cmd_response, list):
                         await send_media_group(bot_token, chat_id, cmd_response, reply_to_message_id=message_id)