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();
+        }
+    }
+}