diff --git a/migrations/Version20230209142217.php b/migrations/Version20230209142217.php
index b2f3d78..e9941e4 100644
--- a/migrations/Version20230209142217.php
+++ b/migrations/Version20230209142217.php
@@ -8,7 +8,7 @@
 use Doctrine\Migrations\AbstractMigration;
 
 /**
- * PostgreSQL - Add missing defaults to IDs (to use sequences)
+ * PostgreSQL - Add missing defaults to IDs (to use sequences).
  */
 final class Version20230209142217 extends AbstractMigration
 {
@@ -59,4 +59,3 @@ public function down(Schema $schema): void
         $this->addSql('ALTER TABLE calendars ALTER COLUMN synctoken TYPE varchar(255);');
     }
 }
-
diff --git a/src/Controller/DAVController.php b/src/Controller/DAVController.php
index b2cc2aa..2b69972 100644
--- a/src/Controller/DAVController.php
+++ b/src/Controller/DAVController.php
@@ -173,7 +173,7 @@ private function initServer(string $authMethod, string $authRealm = User::DEFAUL
         } else {
             $pdo = $this->em->getConnection()->getWrappedConnection();
         }
-        if (!($pdo instanceof PDO)) {
+        if (!($pdo instanceof \PDO)) {
             $pdo = $pdo->getNativeConnection();
         }
 
diff --git a/src/Entity/AddressBook.php b/src/Entity/AddressBook.php
index 69191bd..993a8d1 100644
--- a/src/Entity/AddressBook.php
+++ b/src/Entity/AddressBook.php
@@ -10,7 +10,9 @@
 
 /**
  * @ORM\Table(name="addressbooks")
+ *
  * @ORM\Entity()
+ *
  * @UniqueEntity(
  *     fields={"principalUri", "uri"},
  *     errorPath="uri",
@@ -21,7 +23,9 @@ class AddressBook
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
@@ -38,6 +42,7 @@ class AddressBook
 
     /**
      * @ORM\Column(type="string", length=255)
+     *
      * @Assert\Regex("/[0-9a-z\-]+/")
      */
     private $uri;
diff --git a/src/Entity/AddressBookChange.php b/src/Entity/AddressBookChange.php
index b039e8b..7c4aaca 100644
--- a/src/Entity/AddressBookChange.php
+++ b/src/Entity/AddressBookChange.php
@@ -6,13 +6,16 @@
 
 /**
  * @ORM\Table(name="addressbookchanges")
+ *
  * @ORM\Entity()
  */
 class AddressBookChange
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
@@ -29,6 +32,7 @@ class AddressBookChange
 
     /**
      * @ORM\ManyToOne(targetEntity="App\Entity\AddressBook", inversedBy="changes")
+     *
      * @ORM\JoinColumn(name="addressbookid", nullable=false)
      */
     private $addressBook;
diff --git a/src/Entity/Calendar.php b/src/Entity/Calendar.php
index 79cdbed..02d3b8a 100644
--- a/src/Entity/Calendar.php
+++ b/src/Entity/Calendar.php
@@ -8,6 +8,7 @@
 
 /**
  * @ORM\Table(name="calendars")
+ *
  * @ORM\Entity()
  */
 class Calendar
@@ -18,7 +19,9 @@ class Calendar
 
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
diff --git a/src/Entity/CalendarChange.php b/src/Entity/CalendarChange.php
index 628b44d..367b0ed 100644
--- a/src/Entity/CalendarChange.php
+++ b/src/Entity/CalendarChange.php
@@ -6,13 +6,16 @@
 
 /**
  * @ORM\Table(name="calendarchanges")
+ *
  * @ORM\Entity()
  */
 class CalendarChange
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
@@ -29,6 +32,7 @@ class CalendarChange
 
     /**
      * @ORM\ManyToOne(targetEntity="App\Entity\Calendar", inversedBy="changes")
+     *
      * @ORM\JoinColumn(name="calendarid", nullable=false)
      */
     private $calendar;
diff --git a/src/Entity/CalendarInstance.php b/src/Entity/CalendarInstance.php
index bba8467..b107e69 100644
--- a/src/Entity/CalendarInstance.php
+++ b/src/Entity/CalendarInstance.php
@@ -8,7 +8,9 @@
 
 /**
  * @ORM\Table(name="calendarinstances")
+ *
  * @ORM\Entity(repositoryClass="App\Repository\CalendarInstanceRepository")
+ *
  * @UniqueEntity(
  *     fields={"principalUri", "uri"},
  *     errorPath="uri",
@@ -28,13 +30,16 @@ class CalendarInstance
 
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
 
     /**
      * @ORM\ManyToOne(targetEntity="App\Entity\Calendar", cascade={"persist"})
+     *
      * @ORM\JoinColumn(name="calendarid", nullable=false)
      */
     private $calendar;
@@ -56,6 +61,7 @@ class CalendarInstance
 
     /**
      * @ORM\Column(type="string", length=255, nullable=true)
+     *
      * @Assert\Regex("/[0-9a-z\-]+/")
      */
     private $uri;
@@ -72,6 +78,7 @@ class CalendarInstance
 
     /**
      * @ORM\Column(name="calendarcolor", type="string", length=10, nullable=true)
+     *
      * @Assert\Regex("/\#[0-9A-F]{6}/")
      */
     private $calendarColor;
diff --git a/src/Entity/CalendarObject.php b/src/Entity/CalendarObject.php
index 8acc22b..a72d1cf 100644
--- a/src/Entity/CalendarObject.php
+++ b/src/Entity/CalendarObject.php
@@ -6,13 +6,16 @@
 
 /**
  * @ORM\Table(name="calendarobjects")
+ *
  * @ORM\Entity()
  */
 class CalendarObject
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
@@ -29,6 +32,7 @@ class CalendarObject
 
     /**
      * @ORM\ManyToOne(targetEntity="App\Entity\Calendar", inversedBy="objects")
+     *
      * @ORM\JoinColumn(name="calendarid", nullable=false)
      */
     private $calendar;
diff --git a/src/Entity/CalendarSubscription.php b/src/Entity/CalendarSubscription.php
index 0833652..5e5262b 100644
--- a/src/Entity/CalendarSubscription.php
+++ b/src/Entity/CalendarSubscription.php
@@ -6,13 +6,16 @@
 
 /**
  * @ORM\Table(name="calendarsubscriptions")
+ *
  * @ORM\Entity()
  */
 class CalendarSubscription
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
diff --git a/src/Entity/Card.php b/src/Entity/Card.php
index ca8caa8..9e269c5 100644
--- a/src/Entity/Card.php
+++ b/src/Entity/Card.php
@@ -6,19 +6,23 @@
 
 /**
  * @ORM\Table(name="cards")
+ *
  * @ORM\Entity()
  */
 class Card
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
 
     /**
      * @ORM\ManyToOne(targetEntity="App\Entity\AddressBook", inversedBy="cards")
+     *
      * @ORM\JoinColumn(name="addressbookid", nullable=false)
      */
     private $addressBook;
diff --git a/src/Entity/Lock.php b/src/Entity/Lock.php
index b59363a..4da132c 100644
--- a/src/Entity/Lock.php
+++ b/src/Entity/Lock.php
@@ -6,13 +6,16 @@
 
 /**
  * @ORM\Table(name="locks")
+ *
  * @ORM\Entity()
  */
 class Lock
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
diff --git a/src/Entity/Principal.php b/src/Entity/Principal.php
index 4005722..c99e132 100644
--- a/src/Entity/Principal.php
+++ b/src/Entity/Principal.php
@@ -10,7 +10,9 @@
 
 /**
  * @ORM\Table(name="principals")
+ *
  * @ORM\Entity(repositoryClass="App\Repository\PrincipalRepository")
+ *
  * @UniqueEntity("uri")
  */
 class Principal
@@ -22,23 +24,29 @@ class Principal
 
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
 
     /**
      * @ORM\Column(type="string", length=255, unique=true)
+     *
      * @Assert\NotBlank
+     *
      * @Assert\Unique
      */
     private $uri;
 
     /**
      * @ORM\Column(type="string", length=255, nullable=true)
+     *
      * @Assert\Email(
      *     message = "The email '{{ value }}' is not a valid email."
      * )
+     *
      * @Assert\NotBlank
      */
     private $email;
@@ -50,21 +58,25 @@ class Principal
 
     /**
      * @ORM\Column(type="boolean")
+     *
      * @Assert\NotBlank
      */
     private $isMain;
 
     /**
      * @ORM\Column(type="boolean")
+     *
      * @Assert\NotBlank
      */
     private $isAdmin;
 
     /**
      * @ORM\ManyToMany(targetEntity="Principal")
+     *
      * @ORM\JoinTable(
      *  name="groupmembers",
      *  joinColumns={
+     *
      *      @ORM\JoinColumn(name="principal_id", referencedColumnName="id")
      *  },
      *  inverseJoinColumns={
diff --git a/src/Entity/PropertyStorage.php b/src/Entity/PropertyStorage.php
index 51e051c..0e5ba80 100644
--- a/src/Entity/PropertyStorage.php
+++ b/src/Entity/PropertyStorage.php
@@ -6,13 +6,16 @@
 
 /**
  * @ORM\Table(name="propertystorage")
+ *
  * @ORM\Entity()
  */
 class PropertyStorage
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
diff --git a/src/Entity/SchedulingObject.php b/src/Entity/SchedulingObject.php
index ed79687..01196fc 100644
--- a/src/Entity/SchedulingObject.php
+++ b/src/Entity/SchedulingObject.php
@@ -7,13 +7,16 @@
 
 /**
  * @ORM\Table(name="schedulingobjects")
+ *
  * @ORM\Entity()
  */
 class SchedulingObject
 {
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
@@ -30,6 +33,7 @@ class SchedulingObject
 
     /**
      * @ORM\Column(type="string", length=255, nullable=true)
+     *
      * @Assert\Regex("/[0-9a-z\-]+/")
      */
     private $uri;
diff --git a/src/Entity/User.php b/src/Entity/User.php
index 0ced8f4..ee3664b 100644
--- a/src/Entity/User.php
+++ b/src/Entity/User.php
@@ -8,7 +8,9 @@
 
 /**
  * @ORM\Table(name="users")
+ *
  * @ORM\Entity()
+ *
  * @UniqueEntity("username")
  */
 class User
@@ -17,13 +19,16 @@ class User
 
     /**
      * @ORM\Id()
+     *
      * @ORM\GeneratedValue()
+     *
      * @ORM\Column(type="integer")
      */
     private $id;
 
     /**
      * @ORM\Column(type="string", length=255, unique=true)
+     *
      * @Assert\NotBlank
      */
     private $username;