diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Activite.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Activite.java
index 6c3841f..96105b0 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Activite.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Activite.java
@@ -21,7 +21,7 @@ public class Activite implements Serializable {
 
     @Id
     @GeneratedValue
-    private Long id;
+    private Integer id;
     private String name;
     private String theme;
     private Long duree;
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
index ddacacc..69bcd52 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Admin.java
@@ -2,6 +2,7 @@ package hackathon.FrisbYEE.jpa.metier;
 
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -17,9 +18,12 @@ public class Admin {
     
     @Id
     @GeneratedValue
-    private Long id;
+    private Integer id;
     private String name;
 
+    @OneToOne(mappedBy = "admin")
+    private User user;
+
     public Admin(String name){
         this.name = name;
     }
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
index 42235e4..9c6aa24 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Athlete.java
@@ -3,6 +3,7 @@ package hackathon.FrisbYEE.jpa.metier;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
 import jakarta.persistence.ManyToMany;
+import jakarta.persistence.OneToOne;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -21,7 +22,7 @@ public class Athlete {
     
     @Id
     @GeneratedValue
-    private Long id;
+    private Integer id;
     private String name;
     private String categorie;
     private String niveau;
@@ -32,6 +33,9 @@ public class Athlete {
     @ManyToMany(mappedBy = "athletes")
     private List<Session> sessions = new ArrayList<>(); // plusieurs sessions sont possibles
 
+    @OneToOne(mappedBy = "athlete")
+    private User user;
+
     public Athlete(String name){
         this.name = name;
     }
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
index 6294ab9..7a11fb5 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Coach.java
@@ -3,6 +3,7 @@ package hackathon.FrisbYEE.jpa.metier;
 import jakarta.persistence.GeneratedValue;
 import jakarta.persistence.Id;
 import jakarta.persistence.OneToMany;
+import jakarta.persistence.OneToOne;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -20,12 +21,15 @@ public class Coach {
     
     @Id
     @GeneratedValue
-    private Long id;
+    private Integer id;
     private String name;
 
     @OneToMany(mappedBy = "coach")
     private List<Session> sessions = new ArrayList<>(); // Un coach peut avoir plusieurs sessions
 
+    @OneToOne(mappedBy = "coach")
+    private User user;
+
     public Coach(String name){
         this.name = name;
     }
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Role.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Role.java
new file mode 100644
index 0000000..dbdc97e
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Role.java
@@ -0,0 +1,7 @@
+package hackathon.FrisbYEE.jpa.metier;
+
+public enum Role {
+    ADMIN,
+    COACH,
+    ATHLETE
+}
\ No newline at end of file
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Session.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Session.java
index f7d565e..51b75d2 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Session.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/Session.java
@@ -24,7 +24,7 @@ public class Session {
 
     @Id
     @GeneratedValue
-    private Long id;
+    private Integer id;
     private String name;
     private Boolean isRecurrent;
     private LocalDateTime creneau;
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/User.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/User.java
new file mode 100644
index 0000000..00eb7b0
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/metier/User.java
@@ -0,0 +1,61 @@
+package hackathon.FrisbYEE.jpa.metier;
+
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToOne;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import java.io.Serializable;
+import jakarta.persistence.Access;
+import jakarta.persistence.AccessType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.EnumType;
+import jakarta.persistence.Enumerated;
+import jakarta.persistence.CascadeType;
+
+@Entity
+@Getter @Setter @NoArgsConstructor
+@Access(AccessType.FIELD)
+
+public class User implements Serializable {
+
+    @Id
+    @GeneratedValue
+    private Integer id;
+    @Column(unique = true, nullable = false) //pas possible d'avoir le même nom
+    private String name;
+    @Column (nullable = false)
+    private String motDePasse;
+    private String email;
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    private Role role;
+
+    @OneToOne(cascade = CascadeType.ALL)
+    private Coach coach;
+
+    @OneToOne(cascade = CascadeType.ALL)
+    private Athlete athlete;
+
+    @OneToOne(cascade = CascadeType.ALL)
+    private Admin admin;
+
+    public User(String name) {
+        this.name = name;
+    }
+
+    public User(String name, String motDePasse, String email, Role role) {
+        this.name = name;
+        this.motDePasse = motDePasse;
+        this.email = email;
+        this.role = role;
+    }
+
+    @Override
+    public String toString() {
+        return "User [id=" + id + " , name=" + name + "]";
+    }
+}
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/ActiviteDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/ActiviteDAO.java
index b238e75..94d3e0a 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/ActiviteDAO.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/ActiviteDAO.java
@@ -2,7 +2,9 @@ package hackathon.FrisbYEE.jpa.service;
 
 import hackathon.FrisbYEE.jpa.metier.Activite;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public interface ActiviteDAO extends JpaRepository<Activite, Integer>  {
-    Activite findByKeycloakId(String keycloakId);
+    
 }
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AdminDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AdminDAO.java
new file mode 100644
index 0000000..273dccb
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AdminDAO.java
@@ -0,0 +1,10 @@
+package hackathon.FrisbYEE.jpa.service;
+
+import hackathon.FrisbYEE.jpa.metier.Admin;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface AdminDAO extends JpaRepository<Admin, Integer> {
+
+}
\ No newline at end of file
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AthleteDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AthleteDAO.java
index 9a352a3..3782f74 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AthleteDAO.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/AthleteDAO.java
@@ -1,9 +1,9 @@
 package hackathon.FrisbYEE.jpa.service;
 
-import hackathon.FrisbYEE.jpa.metier.Activite;
 import hackathon.FrisbYEE.jpa.metier.Athlete;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public interface AthleteDAO extends JpaRepository<Athlete, Integer> {
-}
-
+}
\ No newline at end of file
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java
index fe16ff9..8c4266b 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java
@@ -1,4 +1,10 @@
 package hackathon.FrisbYEE.jpa.service;
 
-public class CoachDAO {
-}
+import hackathon.FrisbYEE.jpa.metier.Coach;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface CoachDAO extends JpaRepository<Coach, Integer> {
+
+}
\ No newline at end of file
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/SessionDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/SessionDAO.java
new file mode 100644
index 0000000..9a68a26
--- /dev/null
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/SessionDAO.java
@@ -0,0 +1,10 @@
+package hackathon.FrisbYEE.jpa.service;
+
+import hackathon.FrisbYEE.jpa.metier.Session;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface SessionDAO extends JpaRepository<Session, Integer>  {
+    
+}