Fix nullability on expanded Listener data.

src/Entity/ListenerDevice.php

@@ -21,10 +21,10 @@ class ListenerDevice implements \JsonSerializable
     #[ORM\Column]
     protected bool $is_bot = false;
 
-    #[ORM\Column(length: 150)]
+    #[ORM\Column(length: 150, nullable: true)]
     protected ?string $browser_family = null;
 
-    #[ORM\Column(length: 150)]
+    #[ORM\Column(length: 150, nullable: true)]
     protected ?string $os_family = null;
 
     public function getClient(): ?string

src/Entity/ListenerLocation.php

@@ -9,8 +9,8 @@ use Doctrine\ORM\Mapping as ORM;
 #[ORM\Embeddable]
 class ListenerLocation implements \JsonSerializable
 {
-    #[ORM\Column(length: 255)]
-    protected string $description;
+    #[ORM\Column(length: 255, nullable: false)]
+    protected ?string $description = 'Unknown';
 
     #[ORM\Column(length: 150, nullable: true)]
     protected ?string $region = null;

src/Entity/Migration/Version20220421123900.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Entity\Migration;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20220421123900 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Fix nullability of extended Listener columns.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE listener CHANGE device_browser_family device_browser_family VARCHAR(150) DEFAULT NULL, CHANGE device_os_family device_os_family VARCHAR(150) DEFAULT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE listener CHANGE device_browser_family device_browser_family VARCHAR(150) NOT NULL, CHANGE device_os_family device_os_family VARCHAR(150) NOT NULL');
+    }
+}