feat(backend): get_feed mcp tool reads the feed of deleted and edited messages

backend/src/api/mcp/server.py

@@ -1,3 +1,4 @@
+import re
 from collections.abc import Sequence
 from datetime import datetime
 from typing import Any
@@ -23,6 +24,7 @@ from utils.files import resolve_mime
 from utils.read import (
     annotations,
     chats,
+    feed,
     media,
     peers,
     people,
@@ -32,6 +34,7 @@ from utils.read import (
     watches,
 )
 from utils.read.accounts import self_user_id, unknown_account_hint
+from utils.read.feed import CURSOR_PATTERN, FeedChatKind, FeedFilter, FeedKind
 from utils.read.models import DEFAULT_LIMIT, Page
 from utils.read.period import DEFAULT_TZ, MAX_DAYS, known_timezone
 from utils.read.read_receipts import read_info
@@ -73,8 +76,10 @@ Typical flows:
   transcripts; supports chat/sender/date filters and regex).
 - People: `get_person` gives one person in full: profile changes, shared groups,
   joins and leaves, deleted message count, the private chat.
-- Forensics: `get_deleted_messages` and `get_message_versions` recover content
-  removed or edited in Telegram but kept in the archive.
+- Forensics: `get_feed` lists what was deleted or edited in Telegram across
+  all chats, newest first, with the text before and after each edit; a bulk
+  deletion is one item with `message_count`. `get_deleted_messages` and
+  `get_message_versions` recover the content of one chat or one message.
 - Files: `download_media` gets any message attachment (photo, video, voice,
   document, ...). It pulls the file from Telegram if the archive lacks it and
   returns a public link valid 24h that needs no auth (`curl -O <link>`), plus
@@ -255,6 +260,38 @@ async def get_deleted_messages(
     )
 
 
+@mcp.tool
+async def get_feed(
+    account_id: int,
+    kind: FeedKind = FeedKind.ALL,
+    since: datetime | None = None,
+    chat_id: int | None = None,
+    chat_kind: FeedChatKind | None = None,
+    limit: int = DEFAULT_LIMIT,
+    cursor: str | None = None,
+) -> dict[str, Any]:
+    """Deleted and edited messages across chats, newest first.
+
+    `kind` picks deleted, edited or all; `since` keeps items at or after that
+    time; `chat_id` or `chat_kind` (dm, group, channel) narrow it down. Edited
+    items carry `before` and `after` texts. A deleted item with
+    `message_count` above 1 is a bulk deletion in one chat; read its messages
+    with `get_deleted_messages` for that chat. Pass `next_cursor` back as
+    `cursor` for the next page.
+    """
+    if cursor is not None and re.fullmatch(CURSOR_PATTERN, cursor) is None:
+        msg = "cursor must be a next_cursor returned by get_feed"
+        raise ToolError(msg)
+    page = await feed.list_feed(
+        await _pool(),
+        account_id,
+        FeedFilter(kind=kind, chat_id=chat_id, chat_kind=chat_kind, since=since),
+        limit=limit,
+        cursor=cursor,
+    )
+    return page.model_dump(mode="json")
+
+
 @mcp.tool
 async def get_message_versions(
     account_id: int, chat_id: int, message_id: int