1 files changed, 25 insertions, 0 deletions
diff --git a/db/migrate/20230405102815_add_unique_namespace_index_to_storage_limit_exclusions.rb b/db/migrate/20230405102815_add_unique_namespace_index_to_storage_limit_exclusions.rb
new file mode 100644
index 00000000000..d732fb35ce9
--- /dev/null
+++ b/db/migrate/20230405102815_add_unique_namespace_index_to_storage_limit_exclusions.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class AddUniqueNamespaceIndexToStorageLimitExclusions < Gitlab::Database::Migration[2.1]
+  TABLE_NAME = 'namespaces_storage_limit_exclusions'
+  OLD_INDEX_NAME = 'index_namespaces_storage_limit_exclusions_on_namespace_id'
+  NEW_INDEX_NAME = 'unique_idx_namespaces_storage_limit_exclusions_on_namespace_id'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index TABLE_NAME, :namespace_id,
+      unique: true,
+      name: NEW_INDEX_NAME
+
+    remove_concurrent_index_by_name TABLE_NAME, OLD_INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index TABLE_NAME, :namespace_id,
+      unique: false,
+      name: OLD_INDEX_NAME
+
+    remove_concurrent_index_by_name TABLE_NAME, NEW_INDEX_NAME
+  end
+end