redoing the issue 35 as a separate issue

build.gradle

@@ -32,6 +32,8 @@ dependencies {
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 	implementation 'org.springframework.boot:spring-boot-starter-validation'
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	runtimeOnly 'mysql:mysql-connector-java'
 }
 
 tasks.named('test') {

src/main/java/polish_community_group_11/polish_community/Categories/Categories.java

+package polish_community_group_11.polish_community.Categories;
+
+import jakarta.persistence.*;
+
+@Entity
+@Table(name = "categories")
+public class Categories {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int categoryId;
+
+    @Column(nullable = false, length = 100)
+    private String categoryTitle;
+
+    @Column(nullable = false, length = 255)
+    private String categoryDescription;
+
+    @Column(nullable = false)
+    private int userId;
+
+    // Getters and Setters
+    public int getCategoryId() {
+        return categoryId;
+    }
+
+    public void setCategoryId(int categoryId) {
+        this.categoryId = categoryId;
+    }
+
+    public String getCategoryTitle() {
+        return categoryTitle;
+    }
+
+    public void setCategoryTitle(String categoryTitle) {
+        this.categoryTitle = categoryTitle;
+    }
+
+    public String getCategoryDescription() {
+        return categoryDescription;
+    }
+
+    public void setCategoryDescription(String categoryDescription) {
+        this.categoryDescription = categoryDescription;
+    }
+
+    public int getUserId() {
+        return userId;
+    }
+
+    public void setUserId(int userId) {
+        this.userId = userId;
+    }
+}
+