feat: 1-to-1 message render + web data-lake backend

backend/src/userbot/modules/groups/repository.py

@@ -17,6 +17,26 @@ VALUES ($1, $2, $3, $4, $5, $6, $7, $8::jsonb)
 ON CONFLICT (account_id, chat_id, message_id, user_id) DO NOTHING
 """
 
+_LATEST_TITLE = """
+SELECT title FROM chat_history
+WHERE account_id = $1 AND chat_id = $2 AND title IS NOT NULL
+ORDER BY ts DESC LIMIT 1
+"""
+
+_LATEST_PHOTO = """
+SELECT photo_unique_id FROM chat_history
+WHERE account_id = $1 AND chat_id = $2 AND photo_unique_id IS NOT NULL
+ORDER BY ts DESC LIMIT 1
+"""
+
+
+async def get_latest_chat_meta(
+    pool: asyncpg.Pool, account_id: int, chat_id: int
+) -> tuple[str | None, str | None]:
+    title = await pool.fetchval(_LATEST_TITLE, account_id, chat_id)
+    photo_unique_id = await pool.fetchval(_LATEST_PHOTO, account_id, chat_id)
+    return title, photo_unique_id
+
 
 async def insert_chat_history(  # noqa: PLR0913
     pool: asyncpg.Pool,