feat: internal code for automatic exchange rate fetching

app/apps/currencies/admin.py

@@ -1,6 +1,6 @@
 from django.contrib import admin
 
-from apps.currencies.models import Currency, ExchangeRate
+from apps.currencies.models import Currency, ExchangeRate, ExchangeRateService
 
 
 @admin.register(Currency)
@@ -11,4 +11,18 @@ class CurrencyAdmin(admin.ModelAdmin):
         return super().formfield_for_dbfield(db_field, request, **kwargs)
 
 
+@admin.register(ExchangeRateService)
+class ExchangeRateServiceAdmin(admin.ModelAdmin):
+    list_display = [
+        "name",
+        "service_type",
+        "is_active",
+        "fetch_interval_hours",
+        "last_fetch",
+    ]
+    list_filter = ["is_active", "service_type"]
+    search_fields = ["name"]
+    filter_horizontal = ["target_currencies"]
+
+
 admin.site.register(ExchangeRate)