feat(backend): chat list marks a deleted last message, history pages mark messages with a note

backend/src/utils/read/chats.py

@@ -80,7 +80,8 @@ _CHAT_ROWS = """
 WITH ids AS ({ids})
 SELECT ids.chat_id,
        COALESCE(cs.message_count, 0) AS message_count,
-       cs.last_date, cs.last_text, cs.last_sender_id,
+       cs.last_date, cs.last_text, cs.last_sender_id, cs.last_message_id,
+       COALESCE(cs.last_deleted, false) AS last_deleted,
        COALESCE(named.title,
                 NULLIF(trim(concat_ws(' ', p.first_name, p.last_name)), ''),
                 p.username) AS title,
@@ -149,6 +150,8 @@ def _chat_item(row: asyncpg.Record) -> ChatListItem:
         last_date=row["last_date"],
         last_text=row["last_text"],
         last_sender_id=row["last_sender_id"],
+        last_message_id=row["last_message_id"],
+        last_deleted=row["last_deleted"],
     )
 
 
@@ -259,6 +262,7 @@ async def get_chat_history(  # noqa: PLR0913
             views.append(_build_album(members, media_by_key))
         index = end
     await _apply_read_status(pool, account_id, chat_id, views)
+    await _apply_notes(pool, account_id, chat_id, views)
     return views
 
 
@@ -278,6 +282,7 @@ async def get_message(
     raw = load_raw(row["raw"])
     view = build_message_view(row, raw, _single_media(row, raw, media_by_key))
     await _apply_read_status(pool, account_id, chat_id, [view])
+    await _apply_notes(pool, account_id, chat_id, [view])
     return view
 
 
@@ -301,6 +306,23 @@ async def _apply_read_status(
         )
 
 
+async def _apply_notes(
+    pool: asyncpg.Pool, account_id: int, chat_id: int, views: list[MessageView]
+) -> None:
+    if not views:
+        return
+    rows = await pool.fetch(
+        "SELECT DISTINCT message_id FROM annotations "
+        "WHERE account_id = $1 AND chat_id = $2 AND message_id = ANY($3::bigint[])",
+        account_id,
+        chat_id,
+        [view.message_id for view in views],
+    )
+    noted = {row["message_id"] for row in rows}
+    for view in views:
+        view.has_note = view.message_id in noted
+
+
 def _build_album(
     members: list[tuple[asyncpg.Record, dict]],
     media_by_key: dict[tuple[int, int], asyncpg.Record],