feat: implement currency rates tracking with models, migrations and views

app/Models/Currency.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Currency extends Model
+{
+    /** @use HasFactory<\Database\Factories\CurrencyFactory> */
+    use HasFactory;
+
+    /**
+     * The supported currency codes.
+     */
+    const USD = 'USD';
+
+    const SAR = 'SAR';
+
+    protected $fillable = [
+        'code',
+        'name',
+        'symbol',
+    ];
+
+    /**
+     * Get all supported currency codes
+     */
+    public static function supportedCurrencies(): array
+    {
+        return [
+            self::USD,
+            self::SAR,
+        ];
+    }
+}