Invite code database

Hiya,

Just wondering about the limitations of the invite codes set-up as my client has a potential of 25K codes to be stored and I am not sure whether the current set-up can handle that. I am not very experienced in WP data transactions but it looks like there's no separate table for the invite codes and that they are stored in a single field in the option table. I haven't got enough experience to know whether that would work fine with that amount of data, or whether I'd maybe be better off storing the codes in a separate table?

Thanks for your help