Course.java

import javax.persistence.*;
import java.util.List;

@Entity
@Table(name = "courses")
public class Course 
{
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String title;

    private String description;

    private String major;

    @Column(name = "created_at")
    private String createdAt;

    @OneToMany(mappedBy = "course")
    private List<StudentCourseEnrollment> courseEnrollments;

    //TODO add getters and setters for all properties 
}