feat: add exchange_currency to currency

app/apps/currencies/migrations/0006_currency_exchange_currency.py

@@ -0,0 +1,19 @@
+# Generated by Django 5.1.2 on 2024-11-09 05:03
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('currencies', '0005_alter_currency_name'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='currency',
+            name='exchange_currency',
+            field=models.ForeignKey(blank=True, help_text='Default currency for exchange calculations', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='exchange_currencies', to='currencies.currency', verbose_name='Exchange Currency'),
+        ),
+    ]