diff --git a/pom.xml b/pom.xml
index 138695756..f8719b4b3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
     <groupId>org.springframework.samples</groupId>
     <artifactId>spring-petclinic-rest</artifactId>
-    <version>3.2.1</version>
+    <version>3.3.0</version>
 
     <description>REST version of the Spring Petclinic sample application</description>
     <url>https://spring-petclinic.github.io/</url>
diff --git a/src/main/resources/db/postgres/schema.sql b/src/main/resources/db/postgres/schema.sql
index 49f997b76..9caa06a4b 100644
--- a/src/main/resources/db/postgres/schema.sql
+++ b/src/main/resources/db/postgres/schema.sql
@@ -1,102 +1,75 @@
+-- Create tables only if they don't exist
 CREATE TABLE IF NOT EXISTS vets (
-  id SERIAL,
+  id SERIAL PRIMARY KEY,
   first_name VARCHAR(30),
-  last_name VARCHAR(30),
-  CONSTRAINT pk_vets PRIMARY KEY (id)
+  last_name VARCHAR(30)
 );
 
 CREATE INDEX IF NOT EXISTS idx_vets_last_name ON vets (last_name);
 
-ALTER SEQUENCE vets_id_seq RESTART WITH 100;
-
-
 CREATE TABLE IF NOT EXISTS specialties (
-  id SERIAL,
-  name VARCHAR(80),
-  CONSTRAINT pk_specialties PRIMARY KEY (id)
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(80)
 );
 
 CREATE INDEX IF NOT EXISTS idx_specialties_name ON specialties (name);
 
-ALTER SEQUENCE specialties_id_seq RESTART WITH 100;
-
-
 CREATE TABLE IF NOT EXISTS vet_specialties (
   vet_id INT NOT NULL,
   specialty_id INT NOT NULL,
   FOREIGN KEY (vet_id) REFERENCES vets(id),
   FOREIGN KEY (specialty_id) REFERENCES specialties(id),
-  CONSTRAINT unique_ids UNIQUE (vet_id,specialty_id)
+  UNIQUE (vet_id, specialty_id)
 );
 
-
-
 CREATE TABLE IF NOT EXISTS types (
-  id SERIAL,
-  name VARCHAR(80),
-  CONSTRAINT pk_types PRIMARY KEY (id)
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(80)
 );
 
 CREATE INDEX IF NOT EXISTS idx_types_name ON types (name);
 
-ALTER SEQUENCE types_id_seq RESTART WITH 100;
-
 CREATE TABLE IF NOT EXISTS owners (
-  id SERIAL,
+  id SERIAL PRIMARY KEY,
   first_name VARCHAR(30),
   last_name VARCHAR(30),
   address VARCHAR(255),
   city VARCHAR(80),
-  telephone VARCHAR(20),
-  CONSTRAINT pk_owners PRIMARY KEY (id)
+  telephone VARCHAR(20)
 );
 
 CREATE INDEX IF NOT EXISTS idx_owners_last_name ON owners (last_name);
 
-ALTER SEQUENCE owners_id_seq RESTART WITH 100;
-
-
 CREATE TABLE IF NOT EXISTS pets (
-  id SERIAL,
+  id SERIAL PRIMARY KEY,
   name VARCHAR(30),
   birth_date DATE,
   type_id INT NOT NULL,
   owner_id INT NOT NULL,
   FOREIGN KEY (owner_id) REFERENCES owners(id),
-  FOREIGN KEY (type_id) REFERENCES types(id),
-  CONSTRAINT pk_pets PRIMARY KEY (id)
+  FOREIGN KEY (type_id) REFERENCES types(id)
 );
 
 CREATE INDEX IF NOT EXISTS idx_pets_name ON pets (name);
 
-ALTER SEQUENCE pets_id_seq RESTART WITH 100;
-
-
 CREATE TABLE IF NOT EXISTS visits (
-  id SERIAL,
+  id SERIAL PRIMARY KEY,
   pet_id INT NOT NULL,
   visit_date DATE,
   description VARCHAR(255),
-  FOREIGN KEY (pet_id) REFERENCES pets(id),
-  CONSTRAINT pk_visits PRIMARY KEY (id)
+  FOREIGN KEY (pet_id) REFERENCES pets(id)
 );
 
-ALTER SEQUENCE visits_id_seq RESTART WITH 100;
-
 CREATE TABLE IF NOT EXISTS users (
-  username VARCHAR(20) NOT NULL ,
-  password VARCHAR(20) NOT NULL ,
-  enabled boolean NOT NULL DEFAULT true ,
-  CONSTRAINT pk_users PRIMARY KEY (username)
+  username VARCHAR(20) NOT NULL PRIMARY KEY,
+  password VARCHAR(20) NOT NULL,
+  enabled BOOLEAN NOT NULL DEFAULT true
 );
 
 CREATE TABLE IF NOT EXISTS roles (
-  id SERIAL,
-  username varchar(20) NOT NULL,
-  role varchar(20) NOT NULL,
-  CONSTRAINT pk_roles PRIMARY KEY (id),
-  FOREIGN KEY (username) REFERENCES users (username)
-);
-
-ALTER TABLE roles ADD CONSTRAINT uni_username_role UNIQUE (role,username);
-ALTER SEQUENCE roles_id_seq RESTART WITH 100;
+  id SERIAL PRIMARY KEY,
+  username VARCHAR(20) NOT NULL,
+  role VARCHAR(20) NOT NULL,
+  FOREIGN KEY (username) REFERENCES users (username),
+  UNIQUE (role, username)
+);
\ No newline at end of file