fix: persistence

Author: Angular2Guy

backend/src/main/java/ch/xxx/maps/domain/model/entity/CompanySite.java

@@ -30,7 +30,7 @@ public class CompanySite extends BaseEntity{
 	private String title;
 	@NotNull
 	private LocalDate atDate;
-	@OneToMany(mappedBy = "companySite", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
+	@OneToMany(mappedBy = "companySite", cascade = CascadeType.MERGE, fetch = FetchType.LAZY)
 	private Set<Polygon> polygons = new LinkedHashSet<>();
 
 	public Set<Polygon> getPolygons() {

backend/src/main/java/ch/xxx/maps/domain/model/entity/Polygon.java

@@ -31,7 +31,7 @@ public class Polygon extends BaseEntity {
 	private String title;
 	private BigDecimal longitude;
 	private BigDecimal latitude;
-	@OneToMany(mappedBy = "polygon", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
+	@OneToMany(mappedBy = "polygon", cascade = CascadeType.MERGE, fetch = FetchType.LAZY)
 	private Set<Ring> rings = new LinkedHashSet<>();
 	@ManyToOne(fetch = FetchType.LAZY)
 	@JoinColumn(name = "company_site_id")

backend/src/main/java/ch/xxx/maps/domain/model/entity/Ring.java

@@ -26,7 +26,7 @@
 @Entity
 public class Ring extends BaseEntity {
 	private boolean primaryRing;
-	@OneToMany(mappedBy = "ring", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
+	@OneToMany(mappedBy = "ring", cascade = CascadeType.MERGE, fetch = FetchType.LAZY)
 	private Set<Location> locations = new LinkedHashSet<>();
 	@ManyToOne(fetch = FetchType.LAZY, optional = true)
 	@JoinColumn(name = "polygon_id")