Revert "fix(api): catch duplicate records in RRset on database layer"

This reverts commit b0f9a40.

Author: nils-wisiol

api/desecapi/migrations/0045_rr_unique_record_in_rrset.py

@@ -265,20 +265,6 @@ class RR(ExportModelOperationsMixin("RR"), models.Model):
         dns.rdatatype.SPF: LongQuotedTXT,  # we slightly deviate from RFC 1035 and allow tokens longer than 255 bytes
     }
 
-    class Meta:
-        constraints = [
-            # not using UniqueConstraint as its btree's entry size is limited to 1/3 page size;
-            # however, some records (OPENPGPKEY, PQC keys/signatures?) may be larger
-            # Alternatively, could use a unique constraint on hash(content), but Django lacks API
-            ExclusionConstraint(
-                name="unique_record_in_rrset",
-                expressions=[
-                    ("rrset", RangeOperators.EQUAL),
-                    ("content", RangeOperators.EQUAL),
-                ],
-            ),
-        ]
-
     @classmethod
     def to_wire(cls, type_, any_presentation_format, *, digestable):
         """

api/desecapi/models/records.py

@@ -7,8 +7,6 @@
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.management import call_command
-from django.db import IntegrityError
-from psycopg.errors import ExclusionViolation
 from rest_framework import status
 
 from desecapi.models import BlockedSubnet, Domain, RR, RRset
@@ -17,18 +15,6 @@
 
 
 class UnauthenticatedRRSetTestCase(DesecTestCase):
-    def test_unique_record_in_rrset(self):
-        domain = self.create_domain()
-        with self.assertRaises(IntegrityError) as cm:
-            RRset.objects.create(
-                domain=domain,
-                subname="foo",
-                type="A",
-                ttl=3600,
-                contents=["1.2.3.4"] * 2,
-            )
-        self.assertIsInstance(cm.exception.__cause__, ExclusionViolation)
-
     def test_unauthorized_access(self):
         url = self.reverse("v1:rrsets", name="example.com")
         for method in [