It can only be automated if the only thing you care about is having the code/text, and not making sure they are correct.

> Given this code, extract all entities and create the database schema from these

Sometimes, the best representation for storing and loading data is not the best for manipulating it and vice-versa. Directly mapping code entities to database relations (assuming it's SQL) is a sure way to land yourself in trouble later.

> write documentation for these methods

The intent of documentation is to explain how to use something and the multiple why's behind an implementation. What is there can be done using a symbol explorer. Repeating what is obvious from the name of the function is not helpful. And hallucinating something that is not there is harmful.

> write test examples

Again the type of tests matters more than the amount. So unless you're sure that the test is correct and the test suite really ensure that the code is viable, it's all for naught.

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Your use cases assume that the output is correct. And as the hallucination risk from LLM models is non-zero, such assumption is harmful.