JPA: Singleton Entity
<p>I got a case to deal with an Entity that has one and only one instance.</p>

<p>The case is to model a Configuration class, which will be created once, updated many times and never deleted.</p>

<p>The main idea, is that the entity will be like the properties file but persisted in the database.</p>

<p>Is there any recommandations for modeling this class, any tips or ideas ?</p>