Variable backfillConfigSchema`Const`

backfillConfigSchema: ZodObject<
    {
        accounts: ZodArray<ZodString>;
        lookbackDays: ZodNumber;
        windowDays: ZodNumber;
    },
    $strip,
> = ...

Paced historical Gmail backfill. Optional: absent means the backfill job has nothing configured and fails if run without CLI args. No defaults.