Setup Hibernate for DB Nodes + PostgreSQL

SymphonyDatabaseNode/src/main/java/io/github/lumijiez/Data.java

@@ -0,0 +1,23 @@
+package io.github.lumijiez;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import jakarta.persistence.Persistence;
+
+public class Data {
+    private static final EntityManagerFactory entityManagerFactory;
+
+    static {
+        entityManagerFactory = Persistence.createEntityManagerFactory("mainUnit");
+    }
+
+    public static EntityManager getEntityManager() {
+        return entityManagerFactory.createEntityManager();
+    }
+
+    public static void close() {
+        if (entityManagerFactory != null && entityManagerFactory.isOpen()) {
+            entityManagerFactory.close();
+        }
+    }
+}

SymphonyDatabaseNode/src/main/java/io/github/lumijiez/Main.java

@@ -1,7 +1,13 @@
 package io.github.lumijiez;
 
+import jakarta.persistence.EntityManager;
+
 public class Main {
     public static void main(String[] args) {
         System.out.println("Node up");
+        EntityManager em = Data.getEntityManager();
+
+        System.out.println("Connected to DB << symphony >>");
+        em.close();
     }
 }

SymphonyDatabaseNode/src/main/java/io/github/lumijiez/User.java

@@ -0,0 +1,47 @@
+package io.github.lumijiez;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name="users")
+public class User {
+
+    @Id
+    private Long id;
+    private String name;
+    private String email;
+
+    public User() {}
+
+    public User(Long id, String name, String email) {
+        this.id = id;
+        this.name = name;
+        this.email = email;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+}