Duplicate table fields causes error with graphql-codegen

[jonaskello]

I ran across a case where in custom_tables module there was a table called Price and a table called price. This works with the API becuase it can create a GraphQL schema where both these fields exist as the schema is case sensitive. However when using graphql-codegen it makes the first letter of every type it generated upper-case (this is the convention for type names). So then we get two type Price and compile errors.