feat: add realtime capturing

backend/src/userbot/modules/contacts/__init__.py

@@ -0,0 +1,3 @@
+from userbot.modules.contacts.cache import ContactCache
+
+__all__ = ["ContactCache"]

backend/src/userbot/modules/contacts/cache.py

@@ -0,0 +1,20 @@
+from pyrogram import Client
+
+from utils.logging import logger
+
+
+class ContactCache:
+    def __init__(self, client: Client) -> None:
+        self._client = client
+        self.ids: set[int] = set()
+
+    async def refresh(self) -> None:
+        contacts = await self._client.get_contacts()
+        self.ids = {user.id for user in contacts}
+        logger.info(f"[green]Contacts cached:[/] {len(self.ids)}")
+
+    def mark(self, user_id: int, *, is_contact: bool) -> None:
+        if is_contact:
+            self.ids.add(user_id)
+        else:
+            self.ids.discard(user_id)