feat(notifications): per-chat mute settings

- add chat_notification_settings table and migration
- add chat notifications API (get/update muted)
- skip message notifications for muted recipients
- add mute/unmute control in chat info panel

app/chats/repository.py

@@ -2,7 +2,7 @@ from sqlalchemy import Select, String, func, or_, select
 from sqlalchemy.orm import aliased
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.chats.models import Chat, ChatMember, ChatMemberRole, ChatType
+from app.chats.models import Chat, ChatMember, ChatMemberRole, ChatNotificationSetting, ChatType
 from app.messages.models import Message, MessageHidden, MessageReceipt
 
 
@@ -195,3 +195,38 @@ async def get_unread_count_for_chat(db: AsyncSession, *, chat_id: int, user_id:
     )
     result = await db.execute(stmt)
     return int(result.scalar_one() or 0)
+
+
+async def get_chat_notification_setting(
+    db: AsyncSession, *, chat_id: int, user_id: int
+) -> ChatNotificationSetting | None:
+    result = await db.execute(
+        select(ChatNotificationSetting).where(
+            ChatNotificationSetting.chat_id == chat_id,
+            ChatNotificationSetting.user_id == user_id,
+        )
+    )
+    return result.scalar_one_or_none()
+
+
+async def upsert_chat_notification_setting(
+    db: AsyncSession,
+    *,
+    chat_id: int,
+    user_id: int,
+    muted: bool,
+) -> ChatNotificationSetting:
+    setting = await get_chat_notification_setting(db, chat_id=chat_id, user_id=user_id)
+    if setting:
+        setting.muted = muted
+        await db.flush()
+        return setting
+    setting = ChatNotificationSetting(chat_id=chat_id, user_id=user_id, muted=muted)
+    db.add(setting)
+    await db.flush()
+    return setting
+
+
+async def is_chat_muted_for_user(db: AsyncSession, *, chat_id: int, user_id: int) -> bool:
+    setting = await get_chat_notification_setting(db, chat_id=chat_id, user_id=user_id)
+    return bool(setting and setting.muted)