diff --git a/app/src/Domain/Repository/Channel/ChannelRepository.php b/app/src/Domain/Repository/Channel/ChannelRepository.php
index 1f06d86..c42859f 100644
--- a/app/src/Domain/Repository/Channel/ChannelRepository.php
+++ b/app/src/Domain/Repository/Channel/ChannelRepository.php
@@ -1,4 +1,4 @@
-<?php
+<?php /** @noinspection ALL */
 
 namespace Slovocast\Domain\Repository\Channel;
 
@@ -95,9 +95,11 @@ class ChannelRepository implements ChannelRepositoryInterface
      */
     public function create(Channel $channel, User $owner): int
     {
-        $query = "INSERT INTO channels (name, slug, description, link,
-                                        language, copyright, explicit, owner_id)
-            VALUES (?, ?, ?, ?, ?, ?, ?, ?)";
+        $query = <<<SQL
+INSERT INTO channels (name, slug, description, link,
+                      language, copyright, explicit, owner_id)
+VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+SQL;
 
         $results = await($this->db->query($query, [
             $channel->getName(),
@@ -120,13 +122,16 @@ class ChannelRepository implements ChannelRepositoryInterface
      */
     public function update(Channel $channel): bool
     {
-        $query = "UPDATE channels SET name = ?,
-                                      slug = ?,
-                                      description = ?,
-                                      link = ?,
-                                      language = ?,
-                                      copyright = ?,
-                                      explicit = ?";
+        $query = <<<SQL
+UPDATE channels SET name = ?,
+                    slug = ?,
+                    description = ?,
+                    link = ?,
+                    language = ?,
+                    copyright = ?,
+                    explicit = ?
+WHERE id = ?;
+SQL;
 
         $results = await($this->db->query($query, [
             $channel->getName(),
@@ -136,6 +141,7 @@ class ChannelRepository implements ChannelRepositoryInterface
             $channel->getLanguage(),
             $channel->getCopyright(),
             $channel->isExplicit(),
+            $channel->getId(),
         ]));
 
         return (bool) $results->affectedRows;
diff --git a/app/src/Infrastructure/Api/Database/ConnectionInterface.php b/app/src/Infrastructure/Api/Database/ConnectionInterface.php
new file mode 100644
index 0000000..0cc7599
--- /dev/null
+++ b/app/src/Infrastructure/Api/Database/ConnectionInterface.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Slovocast\Infrastructure\Api\Database;
+
+interface ConnectionInterface
+{
+    public function release(): void;
+}
diff --git a/app/src/Infrastructure/Api/Database/ConnectionPoolInterface.php b/app/src/Infrastructure/Api/Database/ConnectionPoolInterface.php
new file mode 100644
index 0000000..fb9162e
--- /dev/null
+++ b/app/src/Infrastructure/Api/Database/ConnectionPoolInterface.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Slovocast\Infrastructure\Api\Database;
+
+interface ConnectionPoolInterface
+{
+    public function getTotalConnectionCount(): int;
+    public function hasFreeConnection(): bool;
+    public function getConnection(): ConnectionInterface;
+    public function releaseConnection(ConnectionInterface $connection): void;
+}
diff --git a/docker-compose.yml b/docker-compose.yml
index a0bdc99..8884647 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -14,7 +14,7 @@ services:
       - slovocast_db:/var/lib/mysql/data/
   app:
     build:
-      content: .
+      context: .
       dockerfile: deploy/php/Dockerfile
     ports:
       - "8000:8000"