diff --git a/db/post_migrate/20250926194922_add_multi_column_not_null_constraint_to_snippet_repositories.rb b/db/post_migrate/20250926194922_add_multi_column_not_null_constraint_to_snippet_repositories.rb
new file mode 100644
index 0000000000000000000000000000000000000000..db1732ea1ef0b844f31da729b033936ea5baa48f
--- /dev/null
+++ b/db/post_migrate/20250926194922_add_multi_column_not_null_constraint_to_snippet_repositories.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class AddMultiColumnNotNullConstraintToSnippetRepositories < Gitlab::Database::Migration[2.3]
+  disable_ddl_transaction!
+  milestone '18.5'
+
+  def up
+    add_multi_column_not_null_constraint(:snippet_repositories, :snippet_project_id, :snippet_organization_id)
+  end
+
+  def down
+    remove_multi_column_not_null_constraint(:snippet_repositories, :snippet_project_id, :snippet_organization_id)
+  end
+end
diff --git a/db/schema_migrations/20250926194922 b/db/schema_migrations/20250926194922
new file mode 100644
index 0000000000000000000000000000000000000000..390d1f2d9728993b15ef1f2a72fe140ea024aaa8
--- /dev/null
+++ b/db/schema_migrations/20250926194922
@@ -0,0 +1 @@
+1163af9dea85227364debc6f2457733a3b5b8d10cbc56be0484ba98c11ac3afe
\ No newline at end of file
diff --git a/db/structure.sql b/db/structure.sql
index c772285ef9dfb80ed4c826951c9b00a9ae68f5be..edf226525c145b1369ef50774a740156e9f925ca 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -22585,6 +22585,7 @@ CREATE TABLE snippet_repositories (
     verification_started_at timestamp with time zone,
     snippet_project_id bigint,
     snippet_organization_id bigint,
+    CONSTRAINT check_0d1a38de4c CHECK ((num_nonnulls(snippet_organization_id, snippet_project_id) = 1)),
     CONSTRAINT snippet_repositories_verification_failure_text_limit CHECK ((char_length(verification_failure) <= 255))
 );