feat: add tariff config and database schema

tests/test_settings.py

@@ -1,4 +1,5 @@
 import unittest
+import json
 
 from pydantic import ValidationError
 
@@ -26,3 +27,56 @@ class SettingsTests(unittest.TestCase):
         self.assertTrue(settings.WEBAPP_SESSION_SECRET)
         self.assertTrue(settings.WEBHOOK_SECRET_TOKEN)
         self.assertEqual(settings.WEBAPP_SESSION_TTL_SECONDS, 86400)
+
+    def test_tariffs_config_missing_uses_legacy_fallback(self):
+        settings = Settings(
+            _env_file=None,
+            BOT_TOKEN="token",
+            POSTGRES_USER="app_user",
+            POSTGRES_PASSWORD="app_password",
+            TARIFFS_CONFIG_PATH="missing-tariffs.json",
+            TRAFFIC_PACKAGES="10:199",
+        )
+
+        self.assertIsNone(settings.tariffs_config)
+        self.assertTrue(settings.traffic_sale_mode)
+
+    def test_existing_tariffs_config_disables_legacy_traffic_mode(self):
+        import tempfile
+        from pathlib import Path
+
+        with tempfile.TemporaryDirectory() as tmpdir:
+            path = Path(tmpdir) / "tariffs.json"
+            path.write_text(
+                json.dumps(
+                    {
+                        "default_tariff": "standard",
+                        "tariffs": [
+                            {
+                                "key": "standard",
+                                "names": {"ru": "Стандарт"},
+                                "descriptions": {},
+                                "squad_uuids": ["uuid"],
+                                "billing_model": "period",
+                                "monthly_gb": 100,
+                                "prices_rub": {"1": 150},
+                                "prices_stars": {"1": 0},
+                                "enabled_periods": [1],
+                                "enabled": True,
+                            }
+                        ],
+                    }
+                ),
+                encoding="utf-8",
+            )
+            settings = Settings(
+                _env_file=None,
+                BOT_TOKEN="token",
+                POSTGRES_USER="app_user",
+                POSTGRES_PASSWORD="app_password",
+                TARIFFS_CONFIG_PATH=str(path),
+                TRAFFIC_PACKAGES="10:199",
+            )
+
+            self.assertIsNotNone(settings.tariffs_config)
+            self.assertFalse(settings.traffic_sale_mode)