fix: harden state corp exchange imports

src/apps/core/startup_checks.py

@@ -41,6 +41,15 @@ def _check_db(timeout_seconds: int) -> tuple[bool, str]:
         with conn.cursor() as cursor:
             cursor.execute("SELECT 1")
             cursor.fetchone()
+            cursor.execute("SHOW server_encoding")
+            encoding = str(cursor.fetchone()[0]).upper()
+            if encoding != "UTF8":
+                target = f"{params['host']}:{params['port']}/{params['dbname']}"
+                return (
+                    False,
+                    f"{target} (database encoding {encoding} is unsupported; "
+                    "UTF8 is required)",
+                )
         return True, "OK"
     except Exception as exc:  # noqa: BLE001
         target = f"{params['host']}:{params['port']}/{params['dbname']}"

src/apps/exchange/services.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 import base64
 import hashlib
 import json
+import logging
 import struct
 import uuid
 import zlib
@@ -41,6 +42,8 @@ from django.db import transaction
 from django.db.models import Q
 from django.utils import timezone
 
+logger = logging.getLogger(__name__)
+
 
 class ExchangeImportError(ValueError):
     """Exchange package validation or import error."""
@@ -282,6 +285,13 @@ class ExchangePackageImportService:
             )
             raise
         except Exception as exc:  # noqa: BLE001
+            logger.exception(
+                "Unexpected exchange package import failure "
+                "(package_id=%s, package_hash=%s, delivery_channel=%s)",
+                package_id,
+                decoded.package_hash,
+                delivery_channel,
+            )
             error_message = "Не удалось импортировать пакет обмена"
             cls._create_failed_record(
                 decoded=decoded,

src/apps/external_data/migrations/0005_public_procurement_purchase_name_text.py

@@ -0,0 +1,15 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("external_data", "0004_auto_20260527_1928"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="publicprocurement",
+            name="purchase_name",
+            field=models.TextField(verbose_name="предмет закупки"),
+        ),
+    ]

src/apps/external_data/models.py

@@ -134,7 +134,7 @@ class PublicProcurement(UUIDPrimaryKeyMixin, TimestampMixin, models.Model):
     execution_end_date = models.DateField(
         _("дата окончания исполнения"), null=True, blank=True
     )
-    purchase_name = models.CharField(_("предмет закупки"), max_length=500)
+    purchase_name = models.TextField(_("предмет закупки"))
 
     class Meta:
         ordering = ["-contract_date", "purchase_number"]