Add a basic singleton to save on queries.

app/Support/Singleton/PreferencesSingleton.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace FireflyIII\Support\Singleton;
+
+class PreferencesSingleton
+{
+    private static ?PreferencesSingleton $instance = null;
+
+    private array $preferences = [];
+
+    private function __construct()
+    {
+        // Private constructor to prevent direct instantiation.
+    }
+
+    public static function getInstance(): PreferencesSingleton
+    {
+        if (self::$instance === null) {
+            self::$instance = new PreferencesSingleton();
+        }
+
+        return self::$instance;
+    }
+
+    public function setPreference(string $key, mixed $value): void
+    {
+        $this->preferences[$key] = $value;
+    }
+
+    public function getPreference(string $key): mixed
+    {
+        return $this->preferences[$key] ?? null;
+    }
+
+}