изменены базовая сущность, константы и круд репозиторий

backend/src/main/java/com/example/backend/core/configurations/Constants.java

@@ -2,6 +2,7 @@ package com.example.backend.core.configurations;
 
 public class Constants {
     public static final String API_URL = "/api";
+    public static final String SEQUENCE_NAME = "hibernate_sequence";
 
     private Constants() {
     }

backend/src/main/java/com/example/backend/core/model/BaseEntity.java

@@ -1,23 +1,29 @@
 package com.example.backend.core.model;
 
-public class BaseEntity {
+import com.example.backend.core.configurations.Constants;
 
-    public Integer id;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
+import jakarta.persistence.SequenceGenerator;
+
+@MappedSuperclass
+public abstract class BaseEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = Constants.SEQUENCE_NAME)
+    @SequenceGenerator(name = Constants.SEQUENCE_NAME, sequenceName = Constants.SEQUENCE_NAME, allocationSize = 1)
+    protected Long id;
 
     protected BaseEntity() {
-
     }
 
-    protected BaseEntity(Integer id) {
-        this.id = id;
-    }
-
-    public Integer getId() {
+    public Long getId() {
         return id;
     }
 
-    public void setId(Integer id) {
+    public void setId(Long id) {
         this.id = id;
     }
-
 }
+

backend/src/main/java/com/example/backend/favorites/repository/CrudRepository.java

@@ -0,0 +1,5 @@
+package com.example.backend.favorites.repository;
+
+public class CrudRepository<T1, T2> {
+
+}