load last 10 messages on chat add

aggregator/tasks.py

@@ -0,0 +1,14 @@
+from celery_once import QueueOnce
+
+from aggregator.client import get_client
+from config.celery import app
+
+from .models import Chat
+from .client import collect_new_messages as _collect_new_messages
+
+
+@app.task(base=QueueOnce, once={'keys': ['chat_id'], 'graceful': True})
+def collect_new_messages(chat_id):
+    chat = Chat.objects.get(pk=chat_id)
+    with get_client() as client:
+        _collect_new_messages(client, chat)