diff --git a/.env b/.env
index 895fe54..8570d18 100644
--- a/.env
+++ b/.env
@@ -26,7 +26,8 @@ APP_SECRET=d86afe3ae3a4fc75bfbc88cfeb0ecc58
 # DATABASE_URL="sqlite:///%kernel.project_dir%/var/data.db"
 # DATABASE_URL="mysql://app:!ChangeMe!@127.0.0.1:3306/app?serverVersion=8.0.32&charset=utf8mb4"
 # DATABASE_URL="mysql://app:!ChangeMe!@127.0.0.1:3306/app?serverVersion=10.11.2-MariaDB&charset=utf8mb4"
-DATABASE_URL="postgresql://app:!ChangeMe!@127.0.0.1:5432/app?serverVersion=16&charset=utf8"
+# DATABASE_URL="postgresql://app:!ChangeMe!@127.0.0.1:5432/app?serverVersion=16&charset=utf8"
+DATABASE_URL="postgresql://127.0.0.1:5432/db?serverVersion=16&charset=utf8"
 ###< doctrine/doctrine-bundle ###
 
 ###> symfony/messenger ###
diff --git a/migrations/Version20240728020029.php b/migrations/Version20240728020029.php
new file mode 100644
index 0000000..5d5d7a8
--- /dev/null
+++ b/migrations/Version20240728020029.php
@@ -0,0 +1,58 @@
+<?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 Version20240728020029 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('CREATE SEQUENCE comment_id_seq INCREMENT BY 1 MINVALUE 1 START 1');
+        $this->addSql('CREATE SEQUENCE conference_id_seq INCREMENT BY 1 MINVALUE 1 START 1');
+        $this->addSql('CREATE TABLE comment (id INT NOT NULL, conference_id INT NOT NULL, author VARCHAR(255) NOT NULL, text TEXT NOT NULL, email VARCHAR(255) NOT NULL, created_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, photo_filename VARCHAR(255) DEFAULT NULL, PRIMARY KEY(id))');
+        $this->addSql('CREATE INDEX IDX_9474526C604B8382 ON comment (conference_id)');
+        $this->addSql('COMMENT ON COLUMN comment.created_at IS \'(DC2Type:datetime_immutable)\'');
+        $this->addSql('CREATE TABLE conference (id INT NOT NULL, city VARCHAR(255) NOT NULL, year VARCHAR(4) NOT NULL, is_international BOOLEAN NOT NULL, PRIMARY KEY(id))');
+        $this->addSql('CREATE TABLE messenger_messages (id BIGSERIAL NOT NULL, body TEXT NOT NULL, headers TEXT NOT NULL, queue_name VARCHAR(190) NOT NULL, created_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, available_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, delivered_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL, PRIMARY KEY(id))');
+        $this->addSql('CREATE INDEX IDX_75EA56E0FB7336F0 ON messenger_messages (queue_name)');
+        $this->addSql('CREATE INDEX IDX_75EA56E0E3BD61CE ON messenger_messages (available_at)');
+        $this->addSql('CREATE INDEX IDX_75EA56E016BA31DB ON messenger_messages (delivered_at)');
+        $this->addSql('COMMENT ON COLUMN messenger_messages.created_at IS \'(DC2Type:datetime_immutable)\'');
+        $this->addSql('COMMENT ON COLUMN messenger_messages.available_at IS \'(DC2Type:datetime_immutable)\'');
+        $this->addSql('COMMENT ON COLUMN messenger_messages.delivered_at IS \'(DC2Type:datetime_immutable)\'');
+        $this->addSql('CREATE OR REPLACE FUNCTION notify_messenger_messages() RETURNS TRIGGER AS $$
+            BEGIN
+                PERFORM pg_notify(\'messenger_messages\', NEW.queue_name::text);
+                RETURN NEW;
+            END;
+        $$ LANGUAGE plpgsql;');
+        $this->addSql('DROP TRIGGER IF EXISTS notify_trigger ON messenger_messages;');
+        $this->addSql('CREATE TRIGGER notify_trigger AFTER INSERT OR UPDATE ON messenger_messages FOR EACH ROW EXECUTE PROCEDURE notify_messenger_messages();');
+        $this->addSql('ALTER TABLE comment ADD CONSTRAINT FK_9474526C604B8382 FOREIGN KEY (conference_id) REFERENCES conference (id) NOT DEFERRABLE INITIALLY IMMEDIATE');
+    }
+
+    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 comment_id_seq CASCADE');
+        $this->addSql('DROP SEQUENCE conference_id_seq CASCADE');
+        $this->addSql('ALTER TABLE comment DROP CONSTRAINT FK_9474526C604B8382');
+        $this->addSql('DROP TABLE comment');
+        $this->addSql('DROP TABLE conference');
+        $this->addSql('DROP TABLE messenger_messages');
+    }
+}
diff --git a/src/Entity/Comment.php b/src/Entity/Comment.php
new file mode 100644
index 0000000..58e62b5
--- /dev/null
+++ b/src/Entity/Comment.php
@@ -0,0 +1,112 @@
+<?php
+
+namespace App\Entity;
+
+use App\Repository\CommentRepository;
+use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity(repositoryClass: CommentRepository::class)]
+class Comment
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    private ?int $id = null;
+
+    #[ORM\Column(length: 255)]
+    private ?string $author = null;
+
+    #[ORM\Column(type: Types::TEXT)]
+    private ?string $text = null;
+
+    #[ORM\Column(length: 255)]
+    private ?string $email = null;
+
+    #[ORM\Column]
+    private ?\DateTimeImmutable $createdAt = null;
+
+    #[ORM\ManyToOne(inversedBy: 'comments')]
+    #[ORM\JoinColumn(nullable: false)]
+    private ?Conference $conference = null;
+
+    #[ORM\Column(length: 255, nullable: true)]
+    private ?string $photoFilename = null;
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getAuthor(): ?string
+    {
+        return $this->author;
+    }
+
+    public function setAuthor(string $author): static
+    {
+        $this->author = $author;
+
+        return $this;
+    }
+
+    public function getText(): ?string
+    {
+        return $this->text;
+    }
+
+    public function setText(string $text): static
+    {
+        $this->text = $text;
+
+        return $this;
+    }
+
+    public function getEmail(): ?string
+    {
+        return $this->email;
+    }
+
+    public function setEmail(string $email): static
+    {
+        $this->email = $email;
+
+        return $this;
+    }
+
+    public function getCreatedAt(): ?\DateTimeImmutable
+    {
+        return $this->createdAt;
+    }
+
+    public function setCreatedAt(\DateTimeImmutable $createdAt): static
+    {
+        $this->createdAt = $createdAt;
+
+        return $this;
+    }
+
+    public function getConference(): ?Conference
+    {
+        return $this->conference;
+    }
+
+    public function setConference(?Conference $conference): static
+    {
+        $this->conference = $conference;
+
+        return $this;
+    }
+
+    public function getPhotoFilename(): ?string
+    {
+        return $this->photoFilename;
+    }
+
+    public function setPhotoFilename(?string $photoFilename): static
+    {
+        $this->photoFilename = $photoFilename;
+
+        return $this;
+    }
+}
diff --git a/src/Entity/Conference.php b/src/Entity/Conference.php
new file mode 100644
index 0000000..72c3176
--- /dev/null
+++ b/src/Entity/Conference.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace App\Entity;
+
+use App\Repository\ConferenceRepository;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity(repositoryClass: ConferenceRepository::class)]
+class Conference
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    private ?int $id = null;
+
+    #[ORM\Column(length: 255)]
+    private ?string $city = null;
+
+    #[ORM\Column(length: 4)]
+    private ?string $year = null;
+
+    #[ORM\Column]
+    private ?bool $isInternational = null;
+
+    /**
+     * @var Collection<int, Comment>
+     */
+    #[ORM\OneToMany(targetEntity: Comment::class, mappedBy: 'conference', orphanRemoval: true)]
+    private Collection $comments;
+
+    public function __construct()
+    {
+        $this->comments = new ArrayCollection();
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getCity(): ?string
+    {
+        return $this->city;
+    }
+
+    public function setCity(string $city): static
+    {
+        $this->city = $city;
+
+        return $this;
+    }
+
+    public function getYear(): ?string
+    {
+        return $this->year;
+    }
+
+    public function setYear(string $year): static
+    {
+        $this->year = $year;
+
+        return $this;
+    }
+
+    public function isInternational(): ?bool
+    {
+        return $this->isInternational;
+    }
+
+    public function setInternational(bool $isInternational): static
+    {
+        $this->isInternational = $isInternational;
+
+        return $this;
+    }
+
+    /**
+     * @return Collection<int, Comment>
+     */
+    public function getComments(): Collection
+    {
+        return $this->comments;
+    }
+
+    public function addComment(Comment $comment): static
+    {
+        if (!$this->comments->contains($comment)) {
+            $this->comments->add($comment);
+            $comment->setConference($this);
+        }
+
+        return $this;
+    }
+
+    public function removeComment(Comment $comment): static
+    {
+        if ($this->comments->removeElement($comment)) {
+            // set the owning side to null (unless already changed)
+            if ($comment->getConference() === $this) {
+                $comment->setConference(null);
+            }
+        }
+
+        return $this;
+    }
+}
diff --git a/src/Repository/CommentRepository.php b/src/Repository/CommentRepository.php
new file mode 100644
index 0000000..47ea76e
--- /dev/null
+++ b/src/Repository/CommentRepository.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Repository;
+
+use App\Entity\Comment;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * @extends ServiceEntityRepository<Comment>
+ */
+class CommentRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, Comment::class);
+    }
+
+    //    /**
+    //     * @return Comment[] Returns an array of Comment objects
+    //     */
+    //    public function findByExampleField($value): array
+    //    {
+    //        return $this->createQueryBuilder('c')
+    //            ->andWhere('c.exampleField = :val')
+    //            ->setParameter('val', $value)
+    //            ->orderBy('c.id', 'ASC')
+    //            ->setMaxResults(10)
+    //            ->getQuery()
+    //            ->getResult()
+    //        ;
+    //    }
+
+    //    public function findOneBySomeField($value): ?Comment
+    //    {
+    //        return $this->createQueryBuilder('c')
+    //            ->andWhere('c.exampleField = :val')
+    //            ->setParameter('val', $value)
+    //            ->getQuery()
+    //            ->getOneOrNullResult()
+    //        ;
+    //    }
+}
diff --git a/src/Repository/ConferenceRepository.php b/src/Repository/ConferenceRepository.php
new file mode 100644
index 0000000..23fb8e1
--- /dev/null
+++ b/src/Repository/ConferenceRepository.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Repository;
+
+use App\Entity\Conference;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * @extends ServiceEntityRepository<Conference>
+ */
+class ConferenceRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, Conference::class);
+    }
+
+    //    /**
+    //     * @return Conference[] Returns an array of Conference objects
+    //     */
+    //    public function findByExampleField($value): array
+    //    {
+    //        return $this->createQueryBuilder('c')
+    //            ->andWhere('c.exampleField = :val')
+    //            ->setParameter('val', $value)
+    //            ->orderBy('c.id', 'ASC')
+    //            ->setMaxResults(10)
+    //            ->getQuery()
+    //            ->getResult()
+    //        ;
+    //    }
+
+    //    public function findOneBySomeField($value): ?Conference
+    //    {
+    //        return $this->createQueryBuilder('c')
+    //            ->andWhere('c.exampleField = :val')
+    //            ->setParameter('val', $value)
+    //            ->getQuery()
+    //            ->getOneOrNullResult()
+    //        ;
+    //    }
+}