Implement converting prices (#79)

Reviewed-on: #79

games/migrations/0041_purchase_converted_currency_purchase_converted_price_and_more.py

@@ -0,0 +1,36 @@
+# Generated by Django 5.1.3 on 2024-11-10 15:14
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('games', '0040_migrate_device_types'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='purchase',
+            name='converted_currency',
+            field=models.CharField(max_length=3, null=True),
+        ),
+        migrations.AddField(
+            model_name='purchase',
+            name='converted_price',
+            field=models.FloatField(null=True),
+        ),
+        migrations.CreateModel(
+            name='ExchangeRate',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('currency_from', models.CharField(max_length=255)),
+                ('currency_to', models.CharField(max_length=255)),
+                ('year', models.PositiveIntegerField()),
+                ('rate', models.FloatField()),
+            ],
+            options={
+                'unique_together': {('currency_from', 'currency_to', 'year')},
+            },
+        ),
+    ]