https://gist.github.com/xeoncross/d9d24eb52d55f6a5184823b0ee533d72
To use `sql.NullString` or `sql.NullInt64` on a Go (golang) struct you need to wrap sql.NullString...
To use `sql.NullString` or `sql.NullInt64` on a Go (golang) struct you need to wrap sql.NullString inside a new type, then implement the json.Unmarshaler...