Fetch all broadcast messages that are or were transmitted

Regardless of channel.
Do not include:
- broadcasts older than 25.05.2021
- stubbed broadcasts
- broadcasts that were not transmitted. So only broadcasting,
cancelled and completed make the list;

app/dao/broadcast_message_dao.py

@@ -1,4 +1,6 @@
 import uuid
+from datetime import datetime
+from sqlalchemy import desc
 
 from app import db
 from app.dao.dao_utils import autocommit
@@ -9,6 +11,7 @@ from app.models import (
     BroadcastProviderMessage,
     BroadcastProviderMessageNumber,
     BroadcastProviderMessageStatus,
+    BroadcastStatusType
 )
 
 
@@ -29,6 +32,14 @@ def dao_get_broadcast_messages_for_service(service_id):
     ).order_by(BroadcastMessage.created_at)
 
 
+def dao_get_all_broadcast_messages():
+    return BroadcastMessage.query.filter(
+        BroadcastMessage.starts_at >= datetime(2021, 5, 25, 0, 0, 0),
+        BroadcastMessage.stubbed == False,  # noqa
+        BroadcastMessage.status.in_(BroadcastStatusType.LIVE_STATUSES)
+    ).order_by(desc(BroadcastMessage.starts_at)).all()
+
+
 def get_earlier_events_for_broadcast_event(broadcast_event_id):
     """
     This is used to build up the references list.