diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8c7f66a..6be44c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,19 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Add events for device deletion started and finished.
 - Add event for device registration.
 
+## [1.2.1] - Unreleased
+
+### Fixed
+- [astarte_realm_management] Insufficient validation for conflicting options in interface aggregate mappings
+  [#1072](https://github.com/astarte-platform/astarte/issues/1072)
+
+## [1.2.1-rc.0] - 2025-08-22
+### Added
+- Allow `to_int` in custom enum types to be called with valid integers
+- Allow `from_int` in custom enum types to be called with valid atoms
+- Expose a custom `@type` for all structs
+- Implement json encoder for `IncomingIntrospectionEvent`
+
 ## [1.2.0] - 2024-07-01
 
 ## [1.2.0-rc.0] - 2024-05-28
diff --git a/lib/astarte_core/interface.ex b/lib/astarte_core/interface.ex
index dbffb5e..80440fb 100644
--- a/lib/astarte_core/interface.ex
+++ b/lib/astarte_core/interface.ex
@@ -218,7 +218,7 @@ defmodule Astarte.Core.Interface do
 
   defp validate_all_mappings_have_same_attributes(changeset) do
     mappings = get_field(changeset, :mappings, [])
-    aggregation = get_field(changeset, :aggregation, [])
+    aggregation = get_field(changeset, :aggregation, :individual)
 
     if aggregation == :object and mappings != [] do
       %Mapping{
@@ -226,7 +226,9 @@ defmodule Astarte.Core.Interface do
         reliability: reliability,
         expiry: expiry,
         allow_unset: allow_unset,
-        explicit_timestamp: explicit_timestamp
+        explicit_timestamp: explicit_timestamp,
+        database_retention_policy: database_retention_policy,
+        database_retention_ttl: database_retention_ttl
       } = List.first(mappings)
 
       all_same_attributes =
@@ -236,12 +238,16 @@ defmodule Astarte.Core.Interface do
             reliability: mapping_reliability,
             expiry: mapping_expiry,
             allow_unset: mapping_allow_unset,
-            explicit_timestamp: mapping_explicit_timestamp
+            explicit_timestamp: mapping_explicit_timestamp,
+            database_retention_policy: mapping_database_retention_policy,
+            database_retention_ttl: mapping_database_retention_ttl
           } = mapping
 
           retention == mapping_retention and reliability == mapping_reliability and
             expiry == mapping_expiry and allow_unset == mapping_allow_unset and
-            explicit_timestamp == mapping_explicit_timestamp
+            explicit_timestamp == mapping_explicit_timestamp and
+            database_retention_policy == mapping_database_retention_policy and
+            database_retention_ttl == mapping_database_retention_ttl
         end)
 
       unless all_same_attributes do
diff --git a/test/astarte_core/interface_test.exs b/test/astarte_core/interface_test.exs
index 842cfd8..11e5c77 100644
--- a/test/astarte_core/interface_test.exs
+++ b/test/astarte_core/interface_test.exs
@@ -123,6 +123,31 @@ defmodule Astarte.Core.InterfaceTest do
   }
   """
 
+  @conflicting_properties_aggregated_datastreams """
+  {
+   "interface_name": "com.secomind.Hemera.DeviceValues",
+   "version_major": 1,
+   "version_minor": 0,
+   "type": "datastream",
+   "ownership": "producer",
+   "aggregation": "object",
+   "mappings": [
+       {
+           "endpoint": "/value/first",
+           "type": "integer",
+           "database_retention_policy": "use_ttl",
+           "database_retention_ttl": 600
+       },
+       {
+           "endpoint": "/value/second",
+           "type": "integer",
+           "database_retention_policy": "use_ttl",
+           "database_retention_ttl": 300
+       }
+   ]
+  }
+  """
+
   test "aggregated datastream interface deserialization" do
     {:ok, params} = Jason.decode(@aggregated_datastream_interface_json)
 
@@ -212,6 +237,16 @@ defmodule Astarte.Core.InterfaceTest do
     assert %Ecto.Changeset{valid?: false, errors: [endpoint: _]} = mapping_changeset
   end
 
+  test "attributes mismatch in aggregate mappings" do
+    {:ok, params} = Jason.decode(@conflicting_properties_aggregated_datastreams)
+
+    assert %Ecto.Changeset{
+             valid?: false,
+             errors: [mappings: _]
+           } =
+             Interface.changeset(%Interface{}, params)
+  end
+
   test "invalid interface name" do
     params = %{
       "interface_name" => "notok; DROP KEYSPACE astarte;//",