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Here is where you build the core of your application - the database and the application backend to go with it.
Use your chat window like a virtual software architect. It'll help you define a specification for your application or any updates. At first, you can be as specific (or not) as you like!
Focus on describing the functionality of your app - the software architect will take care of the technical implementation.
Don't worry about getting it right the first time, you can always jump back in and make changes later.
Once your architect has enough information to execute some changes to your backend, it'll propose a plan. This comprises SQL and other commands that make changes to your database, and therefore the endpoints that it exposes.