Migrate the models to the JPA/Hibernate.

src/main/java/space/kklochko/jpa_hospital_example/models/Department.java

@@ -1,19 +1,32 @@
-package space.kklochko.jdbc_hospital_example.models;
+package space.kklochko.jpa_hospital_example.models;
 
+import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
 import java.util.UUID;
 
+@Table(name="departments")
+@Entity
 @AllArgsConstructor
 @Data
 public class Department {
+    @Id
+    @Column(nullable = true)
     UUID id;
     String name;
     String location;
     String phone;
 
+    public Department(){
+        setId(UUID.randomUUID());
+        setName("");
+        setLocation("");
+        setPhone("");
+    }
+
     public Department(String name, String location, String phone){
+        setId(UUID.randomUUID());
         setName(name);
         setLocation(location);
         setPhone(phone);

src/main/java/space/kklochko/jpa_hospital_example/models/Indicator.java

@@ -1,20 +1,33 @@
-package space.kklochko.jdbc_hospital_example.models;
+package space.kklochko.jpa_hospital_example.models;
 
+import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
 import java.sql.Timestamp;
 import java.util.UUID;
 
+@Table(name="indicators")
+@Entity
 @AllArgsConstructor
 @Data
 public class Indicator {
+    @Id
+    @Column(nullable = true)
     UUID id;
     String type;
     String values;
     Timestamp timestamp;
 
+    public Indicator(){
+        setId(UUID.randomUUID());
+        setType("");
+        setValues("");
+        setTimestamp(null);
+    }
+
     public Indicator(String type, String values, Timestamp timestamp){
+        setId(UUID.randomUUID());
         setType(type);
         setValues(values);
         setTimestamp(timestamp);

src/main/java/space/kklochko/jpa_hospital_example/models/Patient.java

@@ -1,18 +1,30 @@
-package space.kklochko.jdbc_hospital_example.models;
+package space.kklochko.jpa_hospital_example.models;
 
+import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
 import java.util.ArrayList;
 import java.util.UUID;
 
+@Table(name="patients")
+@Entity
 @Data
 public class Patient {
+    @Id
+    @Column(nullable = true)
     UUID id;
     String name;
     short age;
     String phone;
 
+    public Patient() {
+        setId(UUID.randomUUID());
+        setName("");
+        setAge((short) 0);
+        setPhone("");
+    }
+
     public Patient(UUID id, String name, int age, String phone) {
         setId(id);
         setName(name);
@@ -28,12 +40,14 @@ public class Patient {
     }
 
     public Patient(String name, int age, String phone) {
+        setId(UUID.randomUUID());
         setName(name);
         setAge((short) age);
         setPhone(phone);
     }
 
     public Patient(String name, short age, String phone) {
+        setId(UUID.randomUUID());
         setName(name);
         setAge(age);
         setPhone(phone);