Purge old accounts and temp server lockout

[bluesolarflare]

Hello,

I was wondering if there was a safe way via SQL to safely remove old accounts or old characters? I've had my server running for 5 years and over this period of time I have accumulated around 2-300 accounts that no longer login. I would like to be able to purge accounts that haven't logged in within the past 6 months if possible without any adverse side effect.

Second is there an option to prevent new accounts from being created for a period of time? I would like to have a public beta but limit the amount of users who can sign up during this time. Thanks.