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

database/migrations/2025_05_23_235710_create_rates_table.php

@@ -0,0 +1,34 @@
+<?php
+
+use App\Models\City;
+use App\Models\Currency;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('rates', function (Blueprint $table) {
+            $table->id();
+            $table->foreignIdFor(Currency::class);
+            $table->foreignIdFor(City::class);
+            $table->decimal('buy_price');
+            $table->decimal('sell_price');
+            $table->date('date');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('rates');
+    }
+};