diff --git a/spring-boot-postgres-graphql/README.md b/spring-boot-postgres-graphql/README.md
index 4004af78..ffc12962 100644
--- a/spring-boot-postgres-graphql/README.md
+++ b/spring-boot-postgres-graphql/README.md
@@ -134,6 +134,22 @@ To test the app, start Keploy in test mode. In the root directory, run:
    ```bash
       keploy test -c "mvn spring-boot:run" --delay 15
    ```
+### Note on Mutations
+
+Currently, this GraphQL API supports only query operations for reading data. Mutations for adding or updating books/authors are not yet implemented in the codebase.
+
+Contributors are welcome to add mutation support in future updates.
+### Example Mutation
+
+You can use the following mutation to add a new book:
+
+```graphql
+mutation {
+  addBook(name: "New Book", pageCount: 250, authorId: 1) {
+    id
+    name
+  }
+}
 
    This will run the tests and generate the report in the `Keploy/reports` directory in the current working directory.
 
diff --git a/spring-boot-postgres-graphql/postgres_demo_docker/init.sql b/spring-boot-postgres-graphql/postgres_demo_docker/init.sql
index 858d335e..934dbb94 100644
--- a/spring-boot-postgres-graphql/postgres_demo_docker/init.sql
+++ b/spring-boot-postgres-graphql/postgres_demo_docker/init.sql
@@ -2,7 +2,10 @@
 DO $$ 
 BEGIN
   IF NOT EXISTS (SELECT 1 FROM pg_database WHERE datname = 'library_demo') THEN
-    CREATE DATABASE library_demo;
+        RAISE NOTICE 'Creating database: library_demo';
+  CREATE DATABASE library_demo;
+  ELSE
+    RAISE NOTICE 'Database library_demo already exists, skipping creation';
   END IF;
 END $$;
 
diff --git a/user-manager/src/main/java/com/example/user/model/User.java b/user-manager/src/main/java/com/example/user/model/User.java
index 4fffc845..0afc1bdd 100644
--- a/user-manager/src/main/java/com/example/user/model/User.java
+++ b/user-manager/src/main/java/com/example/user/model/User.java
@@ -4,6 +4,15 @@
 import lombok.ToString;
 import lombok.experimental.Accessors;
 import org.springframework.data.annotation.Id;
+import jakarta.validation.constraints.*;
+
+@NotBlank
+private String name;
+
+@Min(0)
+@Max(150)
+private Integer age;
+
 
 @Data
 @ToString
@@ -16,4 +25,4 @@ public class User {
     private Integer age;
     private String birthday;
 
-}
\ No newline at end of file
+}