JPA 保存实体到 Postgresql 时，枚举字段导致类型不匹配

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User 实体的定义如下：

@Entity
@Table(name = "user_account")
public class User {
    public enum Role {
        CLIENT,
        ADMIN
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @Column(name = "username",nullable = false)
    private String username;

    @Column(name = "password", nullable = false)
    private String password;

    @Column(name = "role", nullable = false)
    private Role role;
    //setters and getters
}

我通过执行SQL，将表中的 role 列添加为枚举类型：

CREATE TYPE role AS ENUM('CLIENT', 'ADMIN')；

我的请求体如下：

{
  "username": "a",
  "password": "your_strong_password",
  "role": "CLIENT"
}

但，在保存实体对象时出现了异常：org.postgresql.util.PSQLException： ERROR: column “role” is of type role but expression is of type smallint Hint: You will need to rewrite or cast the expression"。

这个需要怎么解决?