Members
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Every account on the site, newest first. Tick Cast, Crew or Admin to grant access (it saves straight away). Name links an account to its entry in Names, so credits, productions and, later, call sheets know who it is. Everyone with an account is a Member. Lock account stops an account logging in without deleting anything; Unlock undoes it. Delete account removes the login for good, and its Name and credits stay.
Blocked emails
An email (name@example.com) or a whole domain (example.com, which also covers its subdomains) can't create a new account. Accounts that already exist aren't touched: lock those above.