chore: alter notifications type column

backend/src/main/java/com/openisle/model/Notification.java

@@ -22,7 +22,7 @@ public class Notification {
     private Long id;
 
     @Enumerated(EnumType.STRING)
-    @Column(nullable = false)
+    @Column(nullable = false, length = 50)
     private NotificationType type;
 
     @ManyToOne(fetch = FetchType.LAZY, optional = false)

backend/src/main/resources/db/migration/V2__alter_notifications_type_column.sql

@@ -0,0 +1,2 @@
+ALTER TABLE notifications
+    MODIFY COLUMN type VARCHAR(50) NOT NULL;