Severity and Markdown support in MOTD

[Delivers #133555165]

data/model/message.py

@@ -1,15 +1,20 @@
-from data.database import Messages
+from data.database import Messages, MediaType
 
 
 def get_messages():
   """Query the data base for messages and returns a container of database message objects"""
-  return Messages.select()
+  return Messages.select(Messages, MediaType).join(MediaType)
 
 def create(messages):
   """Insert messages into the database."""
   inserted = []
   for message in messages:
-    inserted.append(Messages.create(content=message['content']))
+    severity = message['severity']
+    media_type_name = message['media_type']
+    media_type = MediaType.get(name=media_type_name)
+
+    inserted.append(Messages.create(content=message['content'], media_type=media_type,
+                                    severity=severity))
   return inserted
 
 def delete_message(uuids):