feat: add empty_weigh and full_weight fields for auto and mechanic rvalution models

core/services/__init__.py

@@ -2,4 +2,5 @@ from .otp import *  # noqa
 from .sms import *  # noqa
 from .user import *  # noqa
 from .didox import *  # noqa
-from .tech_passport import *  # noqa
+from .tech_passport import *  # noqa
+from .currency import *  # noqa

core/services/currency.py

@@ -0,0 +1,33 @@
+from datetime import date
+
+import requests
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+class CurrencyService:
+    BASE_URL = "https://cbu.uz/oz/arkhiv-kursov-valyut/json"
+    CODES = ("USD", "EUR", "RUB")
+    TIMEOUT_SECONDS = 5
+
+    @classmethod
+    def get_rates(cls, target_date=None) -> dict:
+        if target_date is None:
+            target_date = date.today()
+        date_str = target_date.strftime("%Y-%m-%d")
+
+        rates = {}
+        for code in cls.CODES:
+            url = f"{cls.BASE_URL}/{code}/{date_str}/"
+            try:
+                response = requests.get(url, timeout=cls.TIMEOUT_SECONDS)
+                response.raise_for_status()
+                payload = response.json()
+                if isinstance(payload, list) and payload:
+                    rate_value = payload[0].get("Rate")
+                    if rate_value:
+                        rates[code] = rate_value
+            except (requests.RequestException, ValueError) as e:
+                logger.exception(f"CBU API error for {code}: {e}")
+        return rates