diff --git a/src/main/java/fr/plil/sio/persistence/api/Group.java b/src/main/java/fr/plil/sio/persistence/api/Group.java
index d9cf671..f82ecaa 100644
--- a/src/main/java/fr/plil/sio/persistence/api/Group.java
+++ b/src/main/java/fr/plil/sio/persistence/api/Group.java
@@ -1,24 +1,33 @@
 package fr.plil.sio.persistence.api;
 
+import javax.persistence.*;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Set;
 import java.util.TreeSet;
 
+@Entity
+@Table(name = "GROUP_T")
 public class Group {
 
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    @Column(name = "GROUP_ID")
     private Long id;
 
+    @Column(name = "NAME_C")
     private String name;
 
     /**
      * Users in the group.
      */
+    @OneToMany(mappedBy = "group")
     private Set<User> users = new TreeSet<>();
 
     /**
      * List of rights. The list CANNOT contains duplicate rights.
      */
+    @OneToMany
     private List<Right> rights = new LinkedList<>();
 
     public List<Right> getRights() {
diff --git a/src/main/java/fr/plil/sio/persistence/api/Right.java b/src/main/java/fr/plil/sio/persistence/api/Right.java
index cc7ef4e..ed604d8 100644
--- a/src/main/java/fr/plil/sio/persistence/api/Right.java
+++ b/src/main/java/fr/plil/sio/persistence/api/Right.java
@@ -1,18 +1,28 @@
 package fr.plil.sio.persistence.api;
 
+import javax.persistence.*;
 import java.util.HashSet;
 import java.util.Set;
 
+@Entity
+@Table(name = "RIGHT_T")
 public class Right {
 
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    @Column(name = "RIGHT_ID")
     private Long id;
 
+    @Column(name = "NAME_C")
     private String name;
 
-    /// the parent group
+    /// the parent right
+    @ManyToOne
+    @JoinColumn(name = "PARENT_C")
     private Right parent;
 
-    /// the sibling group(s), eventually empty
+    /// the sibling right(s), eventually empty
+    @OneToMany(mappedBy = "parent")
     private Set<Right> siblings = new HashSet<>();
 
     public Set<Right> getSiblings() {
diff --git a/src/main/java/fr/plil/sio/persistence/api/User.java b/src/main/java/fr/plil/sio/persistence/api/User.java
index cbc3f27..b10a57e 100644
--- a/src/main/java/fr/plil/sio/persistence/api/User.java
+++ b/src/main/java/fr/plil/sio/persistence/api/User.java
@@ -1,11 +1,21 @@
 package fr.plil.sio.persistence.api;
 
+import javax.persistence.*;
+
+@Entity
+@Table(name = "USER_T")
 public class User {
 
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    @Column(name = "USER_ID")
     private Long id;
 
+    @Column(name = "NAME_C")
     private String name;
 
+    @ManyToOne
+    @JoinColumn(name = "GROUP_C")
     private Group group;
 
     public Long getId() {
--
libgit2 0.21.2