Pagination: Getting all messages in the beginning is a really bad idea. Front Ends: You might want way more. For example, native apps for smartphones. Protocols: Adding support for XMPP to allow usage of other clients (IRC seems to be outdated; Matrix could be an alternative according to this German post) Complete Project
Using pagination in Flask-SQLAlchemy is important because often times you'll have large datasets in your database that you don't want to appear in your templ...