Fixes the configuration file

app/Models/Config.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+
+final class Config extends Model
+{
+    /** The primary key column for config entries is a string key, not an auto-incrementing integer. */
+    protected $primaryKey = 'key';
+
+    /** Disable auto-incrementing since the primary key is a string. */
+    public $incrementing = false;
+
+    /** The primary key type is a string. */
+    protected $keyType = 'string';
+
+    /** Allow mass assignment on all columns. */
+    protected $guarded = [];
+
+    /**
+     * Returns the attribute cast definitions for this model,
+     * ensuring json_value is always hydrated as a PHP array.
+     */
+    protected function casts(): array
+    {
+        return [
+            'json_value' => 'array',
+        ];
+    }
+
+    /**
+     * Scope to filter config records by their string key identifier.
+     */
+    public function scopeForKey(Builder $query, string $key): Builder
+    {
+        return $query->where('key', $key);
+    }
+}