pyro reverse search_messages

from pyrogram.raw.functions import messages
from pyrogram.raw.types import InputMessagesFilterEmpty
from pyrogram.utils import parse_messages


async def get_my_first_msg(client, chat_id):
    r = await client.invoke(
        messages.Search(
            peer=await client.resolve_peer(chat_id),
            q='',
            filter=InputMessagesFilterEmpty(),
            min_date=0,
            max_date=0,
            offset_id=1,
            add_offset=-1,
            limit=1,
            min_id=0,
            max_id=0,
            from_id=await client.resolve_peer('me'),
            hash=0,
        )
    )
    return (await parse_messages(client, r, replies=0))[0]