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

app/Models/City.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class City extends Model
+{
+    /** @use HasFactory<\Database\Factories\CityFactory> */
+    use HasFactory;
+
+    const SANAA = 'sanaa';
+
+    const ADEN = 'aden';
+
+    protected $fillable = [
+        'name',
+        'label',
+    ];
+
+    /**
+     * Get all supported cities
+     */
+    public static function supportedCities(): array
+    {
+        return [
+            self::SANAA,
+            self::ADEN,
+        ];
+    }
+}