fix: re-do in the event entity

still tentative

src/main/java/com/application/munera/data/Event.java

@@ -5,17 +5,14 @@ import jakarta.validation.constraints.Size;
 import lombok.Getter;
 import lombok.Setter;
 
-import java.util.Set;
-
 @Entity
-@Setter
 @Getter
+@Setter
 @Table(name = "events")
 public class Event {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    @Column(name = "Id", unique = true, nullable = false)
     private Long id;
 
     @Size(max = 100)
@@ -25,11 +22,4 @@ public class Event {
     @Size(max = 100)
     @Column(name = "Description")
     private String description;
-
-    @ManyToMany(fetch = FetchType.EAGER)
-    @JoinTable(
-            name = "Event_participants",
-            joinColumns = @JoinColumn(name = "event_id"),
-            inverseJoinColumns = @JoinColumn(name = "participant_id"))
-    private Set<Person> participants;
 }

src/main/java/com/application/munera/data/Expense.java

@@ -57,6 +57,10 @@ public class Expense  {
             inverseJoinColumns = @JoinColumn(name = "people_id"))
     private Set<Person> debtors;
 
+    @ManyToOne
+    @JoinColumn(name = "EventId")
+    private Event event;
+
     @Column(name = "Date", nullable = false, columnDefinition = "DATE DEFAULT CURRENT_DATE")
     private LocalDate date;
 }

src/main/java/com/application/munera/data/Person.java

@@ -44,7 +44,4 @@ public class Person {
 
     @ManyToMany(mappedBy = "debtors")
     private Set<Expense> debtorExpenses;
-
-    @ManyToMany(mappedBy = "participants")
-    private Set<Event> participants;
 }