diff --git a/.env.ci b/.env.ci
index 7508f67..b599841 100644
--- a/.env.ci
+++ b/.env.ci
@@ -7,9 +7,9 @@ APP_URL=http://127.0.0.1
 LOG_CHANNEL=stack
 LOG_LEVEL=debug
 
-DB_CONNECTION=mysql
+DB_CONNECTION=pgsql
 DB_HOST=127.0.0.1
-DB_PORT=3306
+DB_PORT=5432
 DB_DATABASE=toby
 DB_USERNAME=toby
 DB_PASSWORD=password
diff --git a/.env.dusk.local b/.env.dusk.local
index 3f4837b..48c004f 100644
--- a/.env.dusk.local
+++ b/.env.dusk.local
@@ -10,17 +10,17 @@ DUSK_DRIVER_URL=http://toby-selenium:4444/wd/hub
 LOG_CHANNEL=stack
 LOG_LEVEL=debug
 
-DB_CONNECTION=mysql
+DB_CONNECTION=pgsql
 DB_HOST=toby-db-test
-DB_PORT=3306
+DB_PORT=5432
 DB_DATABASE=toby
 DB_USERNAME=toby
 DB_PASSWORD=password
 
 BROADCAST_DRIVER=log
 CACHE_DRIVER=array
-QUEUE_CONNECTION=sync
-SESSION_DRIVER=file
+QUEUE_CONNECTION=redis
+SESSION_DRIVER=redis
 SESSION_LIFETIME=120
 FILESYSTEM_DISK=local
 MAIL_MAILER=array
diff --git a/.env.example b/.env.example
index 661c459..fe3a597 100644
--- a/.env.example
+++ b/.env.example
@@ -7,33 +7,37 @@ APP_URL=http://localhost
 LOG_CHANNEL=stack
 LOG_LEVEL=debug
 
-DB_CONNECTION=mysql
+DB_CONNECTION=pgsql
 DB_HOST=toby-db-dev
-DB_PORT=3306
+DB_PORT=5432
 DB_DATABASE=toby
 DB_USERNAME=toby
 DB_PASSWORD=password
 DB_ROOT_PASSWORD=example
 
-DOCKER_DEV_DB_EXTERNAL_PORT=3306
+EXTERNAL_WEBSERVER_PORT=80
+
+DOCKER_DEV_DB_EXTERNAL_PORT=5432
 DOCKER_DEV_DB_DATABASE=${DB_DATABASE}
 DOCKER_DEV_DB_USERNAME=${DB_USERNAME}
 DOCKER_DEV_DB_PASSWORD=${DB_PASSWORD}
 DOCKER_DEV_DB_ROOT_PASSWORD=${DB_ROOT_PASSWORD}
 
-DOCKER_TEST_DB_EXTERNAL_PORT=3307
+DOCKER_TEST_DB_EXTERNAL_PORT=5433
 DOCKER_TEST_DB_DATABASE=${DB_DATABASE}
 DOCKER_TEST_DB_USERNAME=${DB_USERNAME}
 DOCKER_TEST_DB_PASSWORD=${DB_PASSWORD}
 DOCKER_TEST_DB_ROOT_PASSWORD=${DB_ROOT_PASSWORD}
 
-EXTERNAL_WEBSERVER_PORT=
+REDIS_PORT=6379
+REDIS_HOST=toby-redis
+
 XDG_CONFIG_HOME=/tmp
 
 BROADCAST_DRIVER=log
 CACHE_DRIVER=file
-QUEUE_CONNECTION=sync
-SESSION_DRIVER=file
+QUEUE_CONNECTION=redis
+SESSION_DRIVER=redis
 SESSION_LIFETIME=120
 FILESYSTEM_DISK=local
 
@@ -46,15 +50,13 @@ MAIL_PORT=${MAILHOG_PORT}
 MAIL_USERNAME=null
 MAIL_PASSWORD=null
 MAIL_ENCRYPTION=null
-MAIL_FROM_ADDRESS=null
+MAIL_FROM_ADDRESS=hello@example.com
 MAIL_FROM_NAME="${APP_NAME}"
 
 DOCKER_INSTALL_XDEBUG=false
 
 GOOGLE_CLIENT_ID=
 GOOGLE_CLIENT_SECRET=
-GOOGLE_REDIRECT=
-
+GOOGLE_REDIRECT=http://localhost/login/google/end
 GOOGLE_CALENDAR_ID=
-
 LOCAL_EMAIL_FOR_LOGIN_VIA_GOOGLE=
diff --git a/.github/workflows/test-and-lint-php.yml b/.github/workflows/test-and-lint-php.yml
index d287df0..c4994a9 100644
--- a/.github/workflows/test-and-lint-php.yml
+++ b/.github/workflows/test-and-lint-php.yml
@@ -11,15 +11,15 @@ jobs:
     name: Test & lint PHP stuff
     runs-on: ubuntu-20.04
     services:
-      mysql:
-        image: mysql:8.0
+      pgsql:
+        image: postgres:13
         env:
-          MYSQL_DATABASE: toby
-          MYSQL_USER: toby
-          MYSQL_PASSWORD: password
-          MYSQL_ALLOW_EMPTY_PASSWORD: 1
+          POSTGRES_DB: toby
+          POSTGRES_USER: toby
+          POSTGRES_PASSWORD: password
+          PGPASSWORD: password
         ports:
-          - 3306:3306
+          - 5432:5432
 
     steps:
       - uses: actions/checkout@v2
diff --git a/.gitignore b/.gitignore
index 113d45d..63cf7ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,6 @@
 /node_modules
 /public/hot
 /public/storage
-/public/avatars
 /public/js/
 /public/css/
 /public/mix-manifest.json
diff --git a/app/Eloquent/Helpers/UserAvatarGenerator.php b/app/Eloquent/Helpers/UserAvatarGenerator.php
deleted file mode 100644
index f21f425..0000000
--- a/app/Eloquent/Helpers/UserAvatarGenerator.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Toby\Eloquent\Helpers;
-
-use Illuminate\Support\Facades\Storage;
-use Illuminate\Support\Str;
-use LasseRafn\InitialAvatarGenerator\InitialAvatar;
-use SVG\SVG;
-use Toby\Eloquent\Models\User;
-
-class UserAvatarGenerator
-{
-    public function __construct(
-        protected InitialAvatar $generator,
-    ) {}
-
-    public function generateFor(User $user): string
-    {
-        $path = "avatars/{$this->generateUuid()}.svg";
-
-        Storage::put($path, $this->generate($user));
-
-        return $path;
-    }
-
-    protected function generate(User $user): SVG
-    {
-        return $this->generator->rounded()
-            ->background($this->getColor($user->fullName))
-            ->color("#F4F8FD")
-            ->smooth()
-            ->fontSize(0.33)
-            ->generateSvg($user->fullName);
-    }
-
-    protected function getColor(string $name): string
-    {
-        $colors = config("colors");
-
-        return $colors[strlen($name) % count($colors)];
-    }
-
-    protected function generateUuid(): string
-    {
-        return Str::uuid()->toString();
-    }
-}
diff --git a/app/Eloquent/Models/User.php b/app/Eloquent/Models/User.php
index eafa9aa..baf733b 100644
--- a/app/Eloquent/Models/User.php
+++ b/app/Eloquent/Models/User.php
@@ -13,6 +13,7 @@ use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Collection;
+use Rackbeat\UIAvatars\HasAvatar;
 use Toby\Domain\Enums\EmploymentForm;
 use Toby\Domain\Enums\Role;
 
@@ -35,6 +36,7 @@ class User extends Authenticatable
     use HasFactory;
     use Notifiable;
     use SoftDeletes;
+    use HasAvatar;
 
     protected $guarded = [];
 
@@ -75,16 +77,18 @@ class User extends Authenticatable
         }
 
         return $query
-            ->where("first_name", "LIKE", "%{$text}%")
-            ->orWhere("last_name", "LIKE", "%{$text}%")
-            ->orWhere("email", "LIKE", "%{$text}%");
+            ->where("first_name", "ILIKE", $text)
+            ->orWhere("last_name", "ILIKE", $text)
+            ->orWhere("email", "ILIKE", $text);
     }
 
-    public function saveAvatar(string $path): void
+    public function getAvatar(): string
     {
-        $this->avatar = $path;
+        $colors = config("colors");
 
-        $this->save();
+        return $this->getAvatarGenerator()
+            ->backgroundColor($colors[strlen($this->fullname) % count($colors)])
+            ->image();
     }
 
     public function getFullNameAttribute(): string
@@ -97,6 +101,11 @@ class User extends Authenticatable
         return $this->role === $role;
     }
 
+    protected function getAvatarNameKey(): string
+    {
+        return "fullName";
+    }
+
     protected static function newFactory(): UserFactory
     {
         return UserFactory::new();
diff --git a/app/Eloquent/Observers/UserObserver.php b/app/Eloquent/Observers/UserObserver.php
index 1d8d3a6..33a76e5 100644
--- a/app/Eloquent/Observers/UserObserver.php
+++ b/app/Eloquent/Observers/UserObserver.php
@@ -4,37 +4,19 @@ declare(strict_types=1);
 
 namespace Toby\Eloquent\Observers;
 
-use Illuminate\Support\Facades\Storage;
-use Toby\Eloquent\Helpers\UserAvatarGenerator;
 use Toby\Eloquent\Helpers\YearPeriodRetriever;
 use Toby\Eloquent\Models\User;
 
 class UserObserver
 {
     public function __construct(
-        protected UserAvatarGenerator $generator,
         protected YearPeriodRetriever $yearPeriodRetriever,
     ) {}
 
     public function created(User $user): void
     {
-        $user->saveAvatar($this->generator->generateFor($user));
-
         $user->vacationLimits()->create([
             "year_period_id" => $this->yearPeriodRetriever->current()->id,
         ]);
     }
-
-    public function updating(User $user): void
-    {
-        if ($user->isDirty(["first_name", "last_name"])) {
-            Storage::delete($user->avatar);
-            $user->avatar = $this->generator->generateFor($user);
-        }
-    }
-
-    public function forceDeleted(User $user): void
-    {
-        Storage::delete($user->avatar);
-    }
 }
diff --git a/app/Eloquent/Observers/YearPeriodObserver.php b/app/Eloquent/Observers/YearPeriodObserver.php
index e74cc3c..b7f370b 100644
--- a/app/Eloquent/Observers/YearPeriodObserver.php
+++ b/app/Eloquent/Observers/YearPeriodObserver.php
@@ -5,14 +5,12 @@ declare(strict_types=1);
 namespace Toby\Eloquent\Observers;
 
 use Toby\Domain\PolishHolidaysRetriever;
-use Toby\Eloquent\Helpers\UserAvatarGenerator;
 use Toby\Eloquent\Models\User;
 use Toby\Eloquent\Models\YearPeriod;
 
 class YearPeriodObserver
 {
     public function __construct(
-        protected UserAvatarGenerator $generator,
         protected PolishHolidaysRetriever $polishHolidaysRetriever,
     ) {}
 
diff --git a/app/Infrastructure/Http/Resources/UserResource.php b/app/Infrastructure/Http/Resources/UserResource.php
index 5e3107f..2428f7f 100644
--- a/app/Infrastructure/Http/Resources/UserResource.php
+++ b/app/Infrastructure/Http/Resources/UserResource.php
@@ -18,7 +18,7 @@ class UserResource extends JsonResource
             "email" => $this->email,
             "role" => $this->role->label(),
             "position" => $this->position,
-            "avatar" => asset($this->avatar),
+            "avatar" => $this->getAvatar(),
             "deleted" => $this->trashed(),
             "employmentForm" => $this->employment_form->label(),
             "employmentDate" => $this->employment_date->toDisplayString(),
diff --git a/composer.json b/composer.json
index 9a9131f..0238916 100644
--- a/composer.json
+++ b/composer.json
@@ -17,10 +17,10 @@
         "laravel/socialite": "^5.2",
         "laravel/telescope": "^4.6",
         "laravel/tinker": "^2.5",
-        "lasserafn/php-initial-avatar-generator": "^4.2",
+        "maatwebsite/excel": "^3.1",
+        "rackbeat/laravel-ui-avatars": "^1.0",
         "spatie/laravel-google-calendar": "^3.5",
-        "spatie/laravel-model-states": "^2.1",
-        "maatwebsite/excel": "^3.1"
+        "spatie/laravel-model-states": "^2.1"
     },
     "require-dev": {
         "blumilksoftware/codestyle": "^0.10.0",
diff --git a/config/cache.php b/config/cache.php
index d520005..39e2bf3 100644
--- a/config/cache.php
+++ b/config/cache.php
@@ -21,6 +21,11 @@ return [
             "driver" => "file",
             "path" => storage_path("framework/cache/data"),
         ],
+        "redis" => [
+            "driver" => "redis",
+            "connection" => "cache",
+            "lock_connection" => "default",
+        ],
     ],
     "prefix" => env("CACHE_PREFIX", Str::slug(env("APP_NAME", "laravel"), "_") . "_cache"),
 ];
diff --git a/config/database.php b/config/database.php
index c3831fc..0ab09ab 100644
--- a/config/database.php
+++ b/config/database.php
@@ -2,28 +2,46 @@
 
 declare(strict_types=1);
 
+use Illuminate\Support\Str;
+
 return [
     "default" => env("DB_CONNECTION", "mysql"),
     "connections" => [
-        "mysql" => [
-            "driver" => "mysql",
+        "pgsql" => [
+            "driver" => "pgsql",
             "url" => env("DATABASE_URL"),
             "host" => env("DB_HOST", "127.0.0.1"),
-            "port" => env("DB_PORT", "3306"),
+            "port" => env("DB_PORT", "5432"),
             "database" => env("DB_DATABASE", "forge"),
             "username" => env("DB_USERNAME", "forge"),
             "password" => env("DB_PASSWORD", ""),
-            "unix_socket" => env("DB_SOCKET", ""),
-            "charset" => "utf8mb4",
-            "collation" => "utf8mb4_unicode_ci",
+            "charset" => "utf8",
             "prefix" => "",
             "prefix_indexes" => true,
-            "strict" => true,
-            "engine" => null,
-            "options" => extension_loaded("pdo_mysql") ? array_filter([
-                PDO::MYSQL_ATTR_SSL_CA => env("MYSQL_ATTR_SSL_CA"),
-            ]) : [],
+            "search_path" => "public",
+            "sslmode" => "prefer",
         ],
     ],
     "migrations" => "migrations",
+    "redis" => [
+        "client" => env("REDIS_CLIENT", "phpredis"),
+        "options" => [
+            "cluster" => env("REDIS_CLUSTER", "redis"),
+            "prefix" => env("REDIS_PREFIX", Str::slug(env("APP_NAME", "laravel"), "_") . "_database_"),
+        ],
+        "default" => [
+            "url" => env("REDIS_URL"),
+            "host" => env("REDIS_HOST", "127.0.0.1"),
+            "password" => env("REDIS_PASSWORD"),
+            "port" => env("REDIS_PORT", "6379"),
+            "database" => env("REDIS_DB", "0"),
+        ],
+        "cache" => [
+            "url" => env("REDIS_URL"),
+            "host" => env("REDIS_HOST", "127.0.0.1"),
+            "password" => env("REDIS_PASSWORD"),
+            "port" => env("REDIS_PORT", "6379"),
+            "database" => env("REDIS_CACHE_DB", "1"),
+        ],
+    ],
 ];
diff --git a/config/filesystems.php b/config/filesystems.php
index af08bf5..80a15f7 100644
--- a/config/filesystems.php
+++ b/config/filesystems.php
@@ -17,6 +17,6 @@ return [
         ],
     ],
     "links" => [
-        public_path("avatars") => storage_path("app/avatars"),
+        public_path("storage") => storage_path("app/storage"),
     ],
 ];
diff --git a/config/queue.php b/config/queue.php
index 27dbd2e..626d9db 100644
--- a/config/queue.php
+++ b/config/queue.php
@@ -8,6 +8,14 @@ return [
         "sync" => [
             "driver" => "sync",
         ],
+        "redis" => [
+            "driver" => "redis",
+            "connection" => "default",
+            "queue" => env("REDIS_QUEUE", "default"),
+            "retry_after" => 90,
+            "block_for" => null,
+            "after_commit" => false,
+        ],
     ],
     "failed" => [
         "driver" => env("QUEUE_FAILED_DRIVER", "database-uuids"),
diff --git a/config/ui-avatars.php b/config/ui-avatars.php
new file mode 100644
index 0000000..68cbd82
--- /dev/null
+++ b/config/ui-avatars.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    "provider" => "api",
+    "default_region" => "eu",
+    "length" => 2,
+    "image_size" => 48,
+    "font_size" => 0.33,
+    "rounded" => true,
+    "smooth_rounding" => true,
+    "uppercase" => true,
+    "background_color" => "#a0a0a0",
+    "font_color" => "#F4F8FD",
+    "font_bold" => true,
+    "providers" => [
+        "api" => Rackbeat\UIAvatars\Generators\ApiGenerator::class,
+        "local" => Rackbeat\UIAvatars\Generators\LocalGenerator::class,
+    ],
+];
diff --git a/database/factories/VacationRequestActivityFactory.php b/database/factories/VacationRequestActivityFactory.php
index c4b8c50..d1de4a3 100644
--- a/database/factories/VacationRequestActivityFactory.php
+++ b/database/factories/VacationRequestActivityFactory.php
@@ -5,7 +5,7 @@ declare(strict_types=1);
 namespace Database\Factories;
 
 use Illuminate\Database\Eloquent\Factories\Factory;
-use Toby\Domain\Enums\VacationRequestState;
+use Toby\Domain\States\VacationRequest\VacationRequestState;
 use Toby\Eloquent\Models\VacationRequestActivity;
 
 class VacationRequestActivityFactory extends Factory
@@ -15,8 +15,8 @@ class VacationRequestActivityFactory extends Factory
     public function definition(): array
     {
         return [
-            "from" => $this->faker->randomElement(VacationRequestState::cases()),
-            "to" => $this->faker->randomElement(VacationRequestState::cases()),
+            "from" => $this->faker->randomElement(VacationRequestState::all()),
+            "to" => $this->faker->randomElement(VacationRequestState::all()),
         ];
     }
 }
diff --git a/database/seeders/DatabaseSeeder.php b/database/seeders/DatabaseSeeder.php
index 9cd93f7..8d58909 100644
--- a/database/seeders/DatabaseSeeder.php
+++ b/database/seeders/DatabaseSeeder.php
@@ -6,10 +6,8 @@ namespace Database\Seeders;
 
 use Illuminate\Database\Seeder;
 use Illuminate\Support\Carbon;
-use Illuminate\Support\Collection;
 use Toby\Domain\PolishHolidaysRetriever;
 use Toby\Domain\VacationDaysCalculator;
-use Toby\Eloquent\Helpers\UserAvatarGenerator;
 use Toby\Eloquent\Models\User;
 use Toby\Eloquent\Models\VacationLimit;
 use Toby\Eloquent\Models\VacationRequest;
@@ -17,10 +15,6 @@ use Toby\Eloquent\Models\YearPeriod;
 
 class DatabaseSeeder extends Seeder
 {
-    public function __construct(
-        protected UserAvatarGenerator $avatarGenerator,
-    ) {}
-
     public function run(): void
     {
         User::unsetEventDispatcher();
@@ -35,8 +29,6 @@ class DatabaseSeeder extends Seeder
 
         $users = User::all();
 
-        $this->generateAvatarsForUsers($users);
-
         YearPeriod::factory()
             ->count(3)
             ->sequence(
@@ -98,11 +90,4 @@ class DatabaseSeeder extends Seeder
                 ->create();
         }
     }
-
-    protected function generateAvatarsForUsers(Collection $users): void
-    {
-        foreach ($users as $user) {
-            $user->saveAvatar($this->avatarGenerator->generateFor($user));
-        }
-    }
 }
diff --git a/database/seeders/DemoSeeder.php b/database/seeders/DemoSeeder.php
index bd4a7ec..6731a3a 100644
--- a/database/seeders/DemoSeeder.php
+++ b/database/seeders/DemoSeeder.php
@@ -6,15 +6,19 @@ namespace Database\Seeders;
 
 use Illuminate\Database\Seeder;
 use Illuminate\Support\Carbon;
-use Illuminate\Support\Collection;
 use Illuminate\Support\Str;
 use Toby\Domain\Enums\EmploymentForm;
 use Toby\Domain\Enums\Role;
-use Toby\Domain\Enums\VacationRequestState;
 use Toby\Domain\Enums\VacationType;
 use Toby\Domain\PolishHolidaysRetriever;
+use Toby\Domain\States\VacationRequest\AcceptedByAdministrative;
+use Toby\Domain\States\VacationRequest\AcceptedByTechnical;
+use Toby\Domain\States\VacationRequest\Approved;
+use Toby\Domain\States\VacationRequest\Created;
+use Toby\Domain\States\VacationRequest\Rejected;
+use Toby\Domain\States\VacationRequest\WaitingForAdministrative;
+use Toby\Domain\States\VacationRequest\WaitingForTechnical;
 use Toby\Domain\VacationDaysCalculator;
-use Toby\Eloquent\Helpers\UserAvatarGenerator;
 use Toby\Eloquent\Models\User;
 use Toby\Eloquent\Models\VacationLimit;
 use Toby\Eloquent\Models\VacationRequest;
@@ -23,10 +27,6 @@ use Toby\Eloquent\Models\YearPeriod;
 
 class DemoSeeder extends Seeder
 {
-    public function __construct(
-        protected UserAvatarGenerator $avatarGenerator,
-    ) {}
-
     public function run(): void
     {
         User::unsetEventDispatcher();
@@ -107,8 +107,6 @@ class DemoSeeder extends Seeder
 
         $users = User::all();
 
-        $this->generateAvatarsForUsers($users);
-
         $year = 2021;
 
         YearPeriod::factory()
@@ -148,7 +146,7 @@ class DemoSeeder extends Seeder
         /** @var VacationRequest $vacationRequestApproved */
         $vacationRequestApproved = VacationRequest::factory([
             "type" => VacationType::Vacation->value,
-            "state" => VacationRequestState::Created,
+            "state" => Created::class,
             "from" => Carbon::create($currentYearPeriod->year, 1, 31)->toDateString(),
             "to" => Carbon::create($currentYearPeriod->year, 2, 4)->toDateString(),
             "comment" => "Komentarz do wniosku urlopowego.",
@@ -175,49 +173,50 @@ class DemoSeeder extends Seeder
 
         VacationRequestActivity::factory([
             "from" => null,
-            "to" => VacationRequestState::Created,
+            "to" => Created::class,
         ])->for($vacationRequestApproved)
             ->for($employee1)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::Created,
-            "to" => VacationRequestState::WaitingForTechnical,
+            "from" => Created::class,
+            "to" => WaitingForTechnical::class,
         ])->for($vacationRequestApproved)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::WaitingForTechnical,
-            "to" => VacationRequestState::AcceptedByTechnical,
+            "from" => WaitingForTechnical::class,
+            "to" => AcceptedByTechnical::class,
         ])->for($vacationRequestApproved)
             ->for($technicalApprover)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::AcceptedByTechnical,
-            "to" => VacationRequestState::WaitingForAdministrative,
+            "from" => AcceptedByTechnical::class,
+            "to" => WaitingForAdministrative::class,
         ])->for($vacationRequestApproved)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::WaitingForAdministrative,
-            "to" => VacationRequestState::AcceptedByAdministrative,
+            "from" => WaitingForAdministrative::class,
+            "to" => AcceptedByAdministrative::class,
         ])->for($vacationRequestApproved)
             ->for($administrativeApprover)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::AcceptedByAdministrative,
-            "to" => VacationRequestState::Approved,
+            "from" => AcceptedByAdministrative::class,
+            "to" => Approved::class,
         ])->for($vacationRequestApproved)
             ->create();
 
-        $vacationRequestApproved->changeStateTo(VacationRequestState::Approved);
+        $vacationRequestApproved->state = new Approved($vacationRequestApproved);
+        $vacationRequestApproved->save();
 
         /** @var VacationRequest $vacationRequestWaitsForAdminApproval */
         $vacationRequestWaitsForAdminApproval = VacationRequest::factory([
             "type" => VacationType::Vacation->value,
-            "state" => VacationRequestState::Created,
+            "state" => Created::class,
             "from" => Carbon::create($currentYearPeriod->year, 2, 14)->toDateString(),
             "to" => Carbon::create($currentYearPeriod->year, 2, 14)->toDateString(),
             "comment" => "Komentarz do wniosku urlopowego.",
@@ -244,36 +243,37 @@ class DemoSeeder extends Seeder
 
         VacationRequestActivity::factory([
             "from" => null,
-            "to" => VacationRequestState::Created,
+            "to" => Created::class,
         ])->for($vacationRequestWaitsForAdminApproval)
             ->for($employee1)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::Created,
-            "to" => VacationRequestState::WaitingForTechnical,
+            "from" => Created::class,
+            "to" => WaitingForTechnical::class,
         ])->for($vacationRequestWaitsForAdminApproval)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::WaitingForTechnical,
-            "to" => VacationRequestState::AcceptedByTechnical,
+            "from" => WaitingForTechnical::class,
+            "to" => AcceptedByTechnical::class,
         ])->for($vacationRequestWaitsForAdminApproval)
             ->for($technicalApprover)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::AcceptedByTechnical,
-            "to" => VacationRequestState::WaitingForAdministrative,
+            "from" => AcceptedByTechnical::class,
+            "to" => WaitingForAdministrative::class,
         ])->for($vacationRequestWaitsForAdminApproval)
             ->create();
 
-        $vacationRequestWaitsForAdminApproval->changeStateTo(VacationRequestState::WaitingForAdministrative);
+        $vacationRequestWaitsForAdminApproval->state = new WaitingForAdministrative($vacationRequestWaitsForAdminApproval);
+        $vacationRequestWaitsForAdminApproval->save();
 
         /** @var VacationRequest $vacationRequestRejected */
         $vacationRequestRejected = VacationRequest::factory([
             "type" => VacationType::Vacation->value,
-            "state" => VacationRequestState::Created,
+            "state" => Created::class,
             "from" => Carbon::create($currentYearPeriod->year, 2, 7)->toDateString(),
             "to" => Carbon::create($currentYearPeriod->year, 2, 7)->toDateString(),
             "comment" => "",
@@ -300,31 +300,25 @@ class DemoSeeder extends Seeder
 
         VacationRequestActivity::factory([
             "from" => null,
-            "to" => VacationRequestState::Created,
+            "to" => Created::class,
         ])->for($vacationRequestRejected)
             ->for($employee1)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::Created,
-            "to" => VacationRequestState::WaitingForTechnical,
+            "from" => Created::class,
+            "to" => WaitingForTechnical::class,
         ])->for($vacationRequestRejected)
             ->create();
 
         VacationRequestActivity::factory([
-            "from" => VacationRequestState::WaitingForTechnical,
-            "to" => VacationRequestState::Rejected,
+            "from" => WaitingForTechnical::class,
+            "to" => Rejected::class,
         ])->for($vacationRequestRejected)
             ->for($technicalApprover)
             ->create();
 
-        $vacationRequestRejected->changeStateTo(VacationRequestState::Rejected);
-    }
-
-    protected function generateAvatarsForUsers(Collection $users): void
-    {
-        foreach ($users as $user) {
-            $user->saveAvatar($this->avatarGenerator->generateFor($user));
-        }
+        $vacationRequestRejected->state = new Rejected($vacationRequestRejected);
+        $vacationRequestRejected->save();
     }
 }
diff --git a/docker-compose.yml b/docker-compose.yml
index 7fcec65..6a4231b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -35,31 +35,42 @@ services:
     restart: unless-stopped
 
   database:
-    image: mysql:8.0
+    image: postgres:13
     container_name: toby-db-dev
     environment:
-      - MYSQL_ROOT_PASSWORD=${DOCKER_DEV_DB_ROOT_PASSWORD}
-      - MYSQL_DATABASE=${DOCKER_DEV_DB_DATABASE}
-      - MYSQL_USER=${DOCKER_DEV_DB_USERNAME}
-      - MYSQL_PASSWORD=${DOCKER_DEV_DB_PASSWORD}
+      - PGPASSWORD=${DOCKER_DEV_DB_ROOT_PASSWORD}
+      - POSTGRES_DB=${DOCKER_DEV_DB_DATABASE}
+      - POSTGRES_USER=${DOCKER_DEV_DB_USERNAME}
+      - POSTGRES_PASSWORD=${DOCKER_DEV_DB_PASSWORD}
     ports:
-      - ${DOCKER_DEV_DB_EXTERNAL_PORT:-3306}:3306
+      - ${DOCKER_DEV_DB_EXTERNAL_PORT:-5432}:5432
     volumes:
-      - toby-mysql-data:/var/lib/mysql
+      - toby-pgsql-data:/var/lib/pgsql
     networks:
       - toby-dev
     restart: unless-stopped
 
   database-test:
-    image: mysql:8.0
+    image: postgres:13
     container_name: toby-db-test
     environment:
-      - MYSQL_ROOT_PASSWORD=${DOCKER_TEST_DB_ROOT_PASSWORD}
-      - MYSQL_DATABASE=${DOCKER_TEST_DB_DATABASE}
-      - MYSQL_USER=${DOCKER_TEST_DB_USERNAME}
-      - MYSQL_PASSWORD=${DOCKER_TEST_DB_PASSWORD}
+      - PGPASSWORD=${DOCKER_TEST_DB_ROOT_PASSWORD}
+      - POSTGRES_DB=${DOCKER_TEST_DB_DATABASE}
+      - POSTGRES_USER=${DOCKER_TEST_DB_USERNAME}
+      - POSTGRES_PASSWORD=${DOCKER_TEST_DB_PASSWORD}
     ports:
-      - ${DOCKER_TEST_DB_EXTERNAL_PORT:-3307}:3306
+      - ${DOCKER_TEST_DB_EXTERNAL_PORT:-5433}:5432
+    networks:
+      - toby-dev
+    restart: unless-stopped
+
+  redis:
+    image: redis:6
+    container_name: toby-redis
+    ports:
+      - ${FORWARD_REDIS_PORT:-6379}:6379
+    volumes:
+      - toby-redis-data:/var/lib/redis
     networks:
       - toby-dev
     restart: unless-stopped
@@ -91,11 +102,14 @@ services:
       - /dev/shm:/dev/shm
     networks:
       - toby-dev
+    restart: unless-stopped
 
 networks:
   toby-dev:
     driver: bridge
 
 volumes:
-  toby-mysql-data:
-    name: toby-mysql-data
+  toby-pgsql-data:
+    name: toby-pgsql-data
+  toby-redis-data:
+    name: toby-redis-data
diff --git a/docker/dev/php/Dockerfile b/docker/dev/php/Dockerfile
index b6cd37d..da0c855 100644
--- a/docker/dev/php/Dockerfile
+++ b/docker/dev/php/Dockerfile
@@ -9,12 +9,15 @@ RUN if [ ${INSTALL_XDEBUG} = true ]; then \
     && docker-php-ext-enable xdebug \
 ;fi
 
-RUN apk --no-cache add \
+RUN pecl install redis  \
+    && apk --no-cache add \
+    postgresql-dev \
     zip \
     libzip-dev \
-    libpng-dev \
     && docker-php-ext-install \
+    pdo_pgsql \
     zip \
-    gd \
     && docker-php-ext-configure \
-    zip
+    zip \
+    && docker-php-ext-enable \
+    redis
diff --git a/phpunit.xml b/phpunit.xml
index c1b2a5c..0b25bbc 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -22,7 +22,7 @@
         <env name="APP_KEY" value="base64:SKEJSy9oF9chQBCMbxqgj5zhtAvug9kwZ+cDiP1Y8A8="/>
         <env name="BCRYPT_ROUNDS" value="4"/>
         <env name="CACHE_DRIVER" value="array"/>
-        <env name="DB_CONNECTION" value="mysql"/>
+        <env name="DB_CONNECTION" value="pgsql"/>
         <env name="DB_HOST" value="toby-db-test"/>
         <env name="DB_DATABASE" value="toby"/>
         <env name="DB_USERNAME" value="toby"/>
diff --git a/routes/web.php b/routes/web.php
index 87f894a..c3505ad 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -50,9 +50,15 @@ Route::middleware("auth")->group(function (): void {
         ->name("vacation.requests.reject");
     Route::post("/vacation-requests/{vacationRequest}/cancel", [VacationRequestController::class, "cancel"])
         ->name("vacation.requests.cancel");
-    Route::post("/vacation-requests/{vacationRequest}/accept-as-technical", [VacationRequestController::class, "acceptAsTechnical"])
+    Route::post(
+        "/vacation-requests/{vacationRequest}/accept-as-technical",
+        [VacationRequestController::class, "acceptAsTechnical"],
+    )
         ->name("vacation.requests.accept-as-technical");
-    Route::post("/vacation-requests/{vacationRequest}/accept-as-administrative", [VacationRequestController::class, "acceptAsAdministrative"])
+    Route::post(
+        "/vacation-requests/{vacationRequest}/accept-as-administrative",
+        [VacationRequestController::class, "acceptAsAdministrative"],
+    )
         ->name("vacation.requests.accept-as-administrative");
 
     Route::post("year-periods/{yearPeriod}/select", SelectYearPeriodController::class)
diff --git a/storage/app/avatars/.gitignore b/storage/app/avatars/.gitignore
deleted file mode 100644
index d6b7ef3..0000000
--- a/storage/app/avatars/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-*
-!.gitignore
diff --git a/tests/Unit/AvatarTest.php b/tests/Unit/AvatarTest.php
deleted file mode 100644
index 2c13d21..0000000
--- a/tests/Unit/AvatarTest.php
+++ /dev/null
@@ -1,73 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Tests\Unit;
-
-use Illuminate\Foundation\Testing\DatabaseMigrations;
-use Illuminate\Support\Facades\Storage;
-use Tests\TestCase;
-use Tests\Traits\InteractsWithYearPeriods;
-use Toby\Eloquent\Models\User;
-
-class AvatarTest extends TestCase
-{
-    use DatabaseMigrations;
-    use InteractsWithYearPeriods;
-
-    protected function setUp(): void
-    {
-        parent::setUp();
-
-        $this->createCurrentYearPeriod();
-        Storage::fake();
-    }
-
-    public function testAvatarIsGeneratedWhenUserIsCreated(): void
-    {
-        $user = User::factory()->create();
-
-        Storage::assertExists($user->avatar);
-    }
-
-    public function testAvatarIsDeletedWhenUserIsForceDeleted(): void
-    {
-        $user = User::factory()->create();
-
-        Storage::assertExists($user->avatar);
-
-        $user->forceDelete();
-
-        Storage::assertMissing($user->avatar);
-    }
-
-    public function testAvatarIsReplacedWhenUserChangedTheirName(): void
-    {
-        $user = User::factory()->create();
-        $oldAvatar = $user->avatar;
-
-        Storage::assertExists($oldAvatar);
-
-        $user->update([
-            "first_name" => "John",
-            "last_name" => "Doe",
-        ]);
-
-        Storage::assertMissing($oldAvatar);
-        Storage::assertExists($user->avatar);
-    }
-
-    public function testAvatarIsNotReplacedWhenUserChangedOtherData(): void
-    {
-        $user = User::factory()->create();
-        $avatar = $user->avatar;
-
-        Storage::assertExists($avatar);
-
-        $user->update([
-            "email" => "john.doe@example.com",
-        ]);
-
-        Storage::assertExists($avatar);
-    }
-}