feat: create message capture policies

backend/src/userbot/handlers/__init__.py

@@ -0,0 +1,3 @@
+from .dialog_filters import dialog_filter_handler
+
+__all__ = ["dialog_filter_handler"]

backend/src/userbot/handlers/dialog_filters.py

@@ -0,0 +1,20 @@
+from pyrogram import Client, raw
+from pyrogram.handlers import RawUpdateHandler
+
+from userbot.folders import FolderCache
+
+_FILTER_UPDATES = (
+    raw.types.UpdateDialogFilter,
+    raw.types.UpdateDialogFilters,
+    raw.types.UpdateDialogFilterOrder,
+)
+
+
+def dialog_filter_handler(cache: FolderCache) -> RawUpdateHandler:
+    async def on_update(
+        _client: Client, update: raw.base.Update, _users: dict, _chats: dict
+    ) -> None:
+        if isinstance(update, _FILTER_UPDATES):
+            await cache.refresh()
+
+    return RawUpdateHandler(on_update)