diff --git a/config/reference.php b/config/reference.php
index ea15291..cd63856 100644
--- a/config/reference.php
+++ b/config/reference.php
@@ -121,7 +121,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  * }
  * @psalm-type ServicesConfig = array{
  *     _defaults?: DefaultsType,
- *     _instanceof?: InstanceofType,
+ *     _instanceof?: array<class-string, InstanceofType>,
  *     ...<string, DefinitionType|AliasType|PrototypeType|StackType|ArgumentsType|null>
  * }
  * @psalm-type ExtensionType = array<string, mixed>
@@ -857,6 +857,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *             http_errors?: bool|Param,
  *             expect?: mixed,
  *             ssl_key?: mixed,
+ *             force_ip_resolve?: mixed, // Default: null
  *             stream?: bool|Param,
  *             synchronous?: bool|Param,
  *             read_timeout?: scalar|Param|null,
diff --git a/src/Service/ContributionStore.php b/src/Service/ContributionStore.php
new file mode 100644
index 0000000..7d61f90
--- /dev/null
+++ b/src/Service/ContributionStore.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service;
+
+use PDO;
+
+class ContributionStore {
+    private PDO $pdo;
+
+    public function __construct(
+        private readonly string $dbPath = "%kernel.project_dir%/var/data/contributions.db",
+        private readonly ?int $retentionDays = null,
+    ){
+        if(!is_dir(\dirname($this->dbPath))){
+            mkdir(\dirname($this->dbPath), 0755, recursive: true);
+        }
+        $this->pdo = new PDO('sqlite:' . $this->dbPath);
+        $this->pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
+        $this->prepareSchema();
+    }
+
+    private function prepareSchema():void{
+        $this->pdo->exec('
+            CREATE TABLE IF NOT EXISTS contributions (
+                provider TEXT NOT NULL,
+                date     TEXT NOT NULL,
+                count    INTEGER NOT NULL CHECK (count >= 0),
+                PRIMARY KEY (provider, date)
+            ) WITHOUT ROWID, STRICT
+        ');
+    }
+    
+}