use uuid length

src/main/java/fr/jaquin/bdlg/planner/persistence/Evenement.java

@@ -2,6 +2,7 @@ package fr.jaquin.bdlg.planner.persistence;
 
 import java.time.LocalDateTime;
 import java.util.Objects;
+import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
@@ -16,6 +17,8 @@ public class Evenement {
   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   private Long id;
+
+  @Column(length = 36)
   private String uuid;
   private String name;
   private String contentHash;