some changes

backend/src/database.py

@@ -5,6 +5,11 @@ from sqlalchemy.sql.expression import select
 from tortoise import fields, models, Tortoise
 import asyncio
 
+# These types don't represent all objects in Horde.
+# Agents and Chats can be created for just a session, in which case, they
+# are not saved on the database, as aren't all their associated values of
+# other classes.
+
 class Base(DeclarativeBase):
     pass