/**
 * Settings of `ownerId` that are not in `existingPairs` (`"<ownerId>:<key>"`)
 * yet. This is what keeps the IAM baseline seed idempotent: `organization_settings`
 * and `unit_settings` have no unique index on (owner, key), so a plain re-insert
 * — or the package seeder's upsert-on-id, which never supplies an id — silently
 * duplicates every row.
 *
 * `value: null` becomes `undefined` so the column default applies on insert.
 */
export function missingSettings<
  TSetting extends { key: string; value?: string | null },
>(
  defaults: TSetting[],
  existingPairs: Set<string>,
  ownerId: string,
): (Omit<TSetting, "value"> & { value?: string })[] {
  return defaults
    .filter((setting) => !existingPairs.has(`${ownerId}:${setting.key}`))
    .map((setting) => ({ ...setting, value: setting.value ?? undefined }));
}