added reesearcher manager for secretary

backend/src/main/java/ovh/herisson/Clyde/Services/ScientificPublications/ResearchesService.java

@@ -114,6 +114,14 @@ public class ResearchesService {
     }
 
     public void deleteResearcher(Researcher researcher) {
+        articleRepo.findAll();
+        for (Research r: articleRepo.findAll())
+        {
+            if (r.getCoAuthors().contains(researcher)){
+                r.getCoAuthors().remove(researcher);
+                articleRepo.save(r);
+            }
+        }
        researcherRepo.delete(researcher);
     }
 

backend/src/main/java/ovh/herisson/Clyde/Tables/ScientificPublications/Researcher.java

@@ -12,6 +12,7 @@ import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
+import org.hibernate.annotations.OnDelete;
 import ovh.herisson.Clyde.Tables.User;
 
 
@@ -24,7 +25,7 @@ public class Researcher {
     @Id
     @GeneratedValue(strategy = GenerationType.AUTO)
     private long id;
-    @OneToOne(cascade=CascadeType.REMOVE, optional=true)
+    @OneToOne
     private User user;
     private String orcidId;
     private String site;