Spring Boot "Cannot add foreign key constraint" - spring-mvc

Question

I have a spring boot rest service with the following model classes -
Report class -
#Entity
#Table (name = "report")
#EntityListeners(AuditingEntityListener.class)
public class Report {
#Id
#Column (name = "id")
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#Column(name = "from_user_id", nullable = false)
private Long fromUserId;
#Column(name = "to_user_id", nullable = false)
private Long toUserId;
#Temporal(TemporalType.DATE)
#JsonFormat(pattern = "dd-MM-yyyy hh:mm:ss")
#CreatedDate
private Date createdAt;
#Column(nullable = false)
private String observation;
[ OTHER VARS AND GETTERS AND SETTERS .... ]
}
User class -
#Entity
#Table (name = "user")
#EntityListeners(AuditingEntityListener.class)
#JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class User {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#Column(nullable = false)
private String firstName;
#Column(nullable = false)
private String lastName;
#Column(unique = true, nullable = false)
private String email;
#Column(nullable = false)
private String password;
#OneToMany(cascade = CascadeType.ALL, targetEntity = Report.class)
#JoinColumn(name = "to_user_id")
private List<Report> reportReceivedList;
#OneToMany(cascade = CascadeType.ALL, targetEntity = Report.class)
#JoinColumn(name = "from_user_id")
private List<Report> reportSentList;
[GETTERS AND SETTERS .....]
}
This is causing a
org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL via JDBC Statement
which in turn is caused by
Caused by: java.sql.SQLException: Cannot add foreign key constraint
I want to create my mapping such that one user can have multiple sent reports and received reports, and once I delete a user, both sent and received reports should get deleted. I have explored loads of links for creating mappings and I am very confused because of different methods given everywhere.