diff --git a/api/migrations/Version20230920163933.php b/api/migrations/Version20230920163933.php
new file mode 100644
index 0000000..8f3c281
--- /dev/null
+++ b/api/migrations/Version20230920163933.php
@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20230920163933 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('DROP SEQUENCE greeting_id_seq CASCADE');
+        $this->addSql('CREATE SEQUENCE book_id_seq INCREMENT BY 1 MINVALUE 1 START 1');
+        $this->addSql('CREATE SEQUENCE review_id_seq INCREMENT BY 1 MINVALUE 1 START 1');
+        $this->addSql('CREATE TABLE book (id INT NOT NULL, isbn VARCHAR(255) DEFAULT NULL, title VARCHAR(255) NOT NULL, description TEXT NOT NULL, author VARCHAR(255) NOT NULL, publication_date TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, PRIMARY KEY(id))');
+        $this->addSql('COMMENT ON COLUMN book.publication_date IS \'(DC2Type:datetime_immutable)\'');
+        $this->addSql('CREATE TABLE review (id INT NOT NULL, book_id INT DEFAULT NULL, rating SMALLINT NOT NULL, body TEXT NOT NULL, author VARCHAR(255) NOT NULL, publication_date TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, PRIMARY KEY(id))');
+        $this->addSql('CREATE INDEX IDX_794381C616A2B381 ON review (book_id)');
+        $this->addSql('COMMENT ON COLUMN review.publication_date IS \'(DC2Type:datetime_immutable)\'');
+        $this->addSql('ALTER TABLE review ADD CONSTRAINT FK_794381C616A2B381 FOREIGN KEY (book_id) REFERENCES book (id) NOT DEFERRABLE INITIALLY IMMEDIATE');
+        $this->addSql('DROP TABLE greeting');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('CREATE SCHEMA public');
+        $this->addSql('DROP SEQUENCE book_id_seq CASCADE');
+        $this->addSql('DROP SEQUENCE review_id_seq CASCADE');
+        $this->addSql('CREATE SEQUENCE greeting_id_seq INCREMENT BY 1 MINVALUE 1 START 1');
+        $this->addSql('CREATE TABLE greeting (id INT NOT NULL, name VARCHAR(255) NOT NULL, PRIMARY KEY(id))');
+        $this->addSql('ALTER TABLE review DROP CONSTRAINT FK_794381C616A2B381');
+        $this->addSql('DROP TABLE book');
+        $this->addSql('DROP TABLE review');
+    }
+}
diff --git a/api/src/Entity/Book.php b/api/src/Entity/Book.php
index 155982c..850b654 100644
--- a/api/src/Entity/Book.php
+++ b/api/src/Entity/Book.php
@@ -3,28 +3,44 @@
 namespace App\Entity;
 use ApiPlatform\Metadata\ApiResource;
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\ORM\Mapping as ORM;
 /** A book. */
+#[ORM\Entity]
 #[ApiResource]
 class Book
 {
-    /** The ID of this book. */
-    private ?int $id = null;
-    /** The ISBN of this book (or null if doesn't have one). */
-    public ?string $isbn = null;
-    /** The title of this book. */
-    public string $title = '';
-    /** The description of this book. */
-    public string $description = '';
-    /** The author of this book. */
-    public string $author = '';
-    /** The publication date of this book. */
-    public ?\DateTimeImmutable $publicationDate = null;
-    /** @var Review[] Available reviews for this book. */
+     /** The ID of this book. */
+    #[ORM\Id, ORM\Column, ORM\GeneratedValue]
+     private ?int $id = null;
+
+     /** The ISBN of this book (or null if doesn't have one). */
+    #[ORM\Column(nullable: true)]
+     public ?string $isbn = null;
+
+     /** The title of this book. */
+    #[ORM\Column]
+     public string $title = '';
+
+     /** The description of this book. */
+    #[ORM\Column(type: 'text')]
+     public string $description = '';
+
+     /** The author of this book. */
+    #[ORM\Column]
+     public string $author = '';
+
+     /** The publication date of this book. */
+    #[ORM\Column]
+     public ?\DateTimeImmutable $publicationDate = null;
+
+     /** @var Review[] Available reviews for this book. */
+    #[ORM\OneToMany(targetEntity: Review::class, mappedBy: 'book', cascade: ['persist', 'remove'])]
     public iterable $reviews;
     public function __construct()
     {
         $this->reviews = new ArrayCollection();
     }
+
     public function getId(): ?int
     {
         return $this->id;
diff --git a/api/src/Entity/Review.php b/api/src/Entity/Review.php
index bd39a04..d263947 100644
--- a/api/src/Entity/Review.php
+++ b/api/src/Entity/Review.php
@@ -2,22 +2,36 @@
 // api/src/Entity/Review.php
 namespace App\Entity;
 use ApiPlatform\Metadata\ApiResource;
+use Doctrine\ORM\Mapping as ORM;
 /** A review of a book. */
+#[ORM\Entity]
 #[ApiResource]
 class Review
 {
     /** The ID of this review. */
+    #[ORM\Id, ORM\Column, ORM\GeneratedValue]
     private ?int $id = null;
+
     /** The rating of this review (between 0 and 5). */
+    #[ORM\Column(type: 'smallint')]
     public int $rating = 0;
+
     /** The body of the review. */
+    #[ORM\Column(type: 'text')]
     public string $body = '';
+
     /** The author of the review. */
+    #[ORM\Column]
     public string $author = '';
+
     /** The date of publication of this review.*/
+    #[ORM\Column]
     public ?\DateTimeImmutable $publicationDate = null;
+
     /** The book this review is about. */
+    #[ORM\ManyToOne(inversedBy: 'reviews')]
     public ?Book $book = null;
+
     public function getId(): ?int
     {
         return $this->id;
diff --git a/docs/openapi.json b/docs/openapi.json
index 8399c09..ad094e7 100644
--- a/docs/openapi.json
+++ b/docs/openapi.json
@@ -892,8 +892,7 @@
         "properties": {
           "id": {
             "readOnly": true,
-            "type": "integer",
-            "nullable": true
+            "type": "integer"
           },
           "isbn": {
             "type": "string",
@@ -910,11 +909,14 @@
           },
           "publicationDate": {
             "type": "string",
-            "format": "date-time",
-            "nullable": true
+            "format": "date-time"
           },
           "reviews": {
-            "type": "string"
+            "type": "array",
+            "items": {
+              "type": "string",
+              "format": "iri-reference"
+            }
           }
         }
       },
@@ -960,8 +962,7 @@
           },
           "id": {
             "readOnly": true,
-            "type": "integer",
-            "nullable": true
+            "type": "integer"
           },
           "isbn": {
             "type": "string",
@@ -978,11 +979,14 @@
           },
           "publicationDate": {
             "type": "string",
-            "format": "date-time",
-            "nullable": true
+            "format": "date-time"
           },
           "reviews": {
-            "type": "string"
+            "type": "array",
+            "items": {
+              "type": "string",
+              "format": "iri-reference"
+            }
           }
         }
       },
@@ -993,8 +997,7 @@
         "properties": {
           "id": {
             "readOnly": true,
-            "type": "integer",
-            "nullable": true
+            "type": "integer"
           },
           "rating": {
             "type": "integer"
@@ -1007,8 +1010,7 @@
           },
           "publicationDate": {
             "type": "string",
-            "format": "date-time",
-            "nullable": true
+            "format": "date-time"
           },
           "book": {
             "type": "string",
@@ -1059,8 +1061,7 @@
           },
           "id": {
             "readOnly": true,
-            "type": "integer",
-            "nullable": true
+            "type": "integer"
           },
           "rating": {
             "type": "integer"
@@ -1073,8 +1074,7 @@
           },
           "publicationDate": {
             "type": "string",
-            "format": "date-time",
-            "nullable": true
+            "format": "date-time"
           },
           "book": {
             "type": "string",