Use Amplify with MySQL

I want to use a GraphQL API connected to a MySQL Database in my mobile App. For this i have configured the AppSync API, generated the Schema out of the database export and generated the models for swift locally. In the amplifyconfiguration i have added the right credentials to the API.

With:

Amplify.API.query(request: .list(Model.self))

i get all database entries, so the connection/configuration is ok, i think.

When i do this:

Amplify.API.mutate(request: .create(Personen(vorname: "Daniel")))

the row will be added but the autoincrement id will be overwritten with an id from anywhere else?! and i get an error: Failed to decode GraphQL response to the 'ResponseType'

When i do this:

Amplify.API.query(request: .get(Personen.self, byId: "1"))

i have the problem that the id is an int in the database and in GraphQL, but byID is expecting a String.

After the above problems i am asking myself if i use Amplify Framework the right way? Do i have to use another Code to use the GraphQL API? Is Amplify Framework only working with normal Amplify DynamoDB? Can i also use DataStore locally and autosync with MySql? I also wanted to add auth to Amplify, but with configuring it, Amplify generated a new Api and everything stopped working. For my Project i want to use Amplify auth, notification, object storage and other services from Amplify.

Maybe someone can give me some clarity over the cooperation between the different services and give some answers to my questions :) Thank you!