fix: harden state corp exchange imports

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"]