/**
 * Resolve the display name for a task / scheduled-task owner.
 *
 * - A real user name (resolved from the users JOIN) is shown as-is.
 * - No-auth single-user deployments own rows under 'local' (new rows) or NULL
 *   (legacy rows created before owner registration was fixed). Both render as
 *   'local' so the lone local operator is shown consistently — instead of the
 *   misleading 'system' / 'user' labels the views used to fall back to.
 * - An owner id with no matching user record (e.g. a deleted account in an auth
 *   deployment) falls back to 'system'.
 */
export function ownerDisplayName(
  ownerId: string | null | undefined,
  ownerName: string | null | undefined,
): string {
  if (ownerName) return ownerName;
  if (ownerId == null || ownerId === 'local') return 'local';
  return 'system';
}