Search active invite

Search pending invite in authdb.invites using requested { id }

• authdb.invites.id == { id }
• authdb.invites.expires_at > now ()

If invite record not found - return NOT_FOUND error

If invite record found but expired - return EXPIRED

Otherwise - create user

Create user

Insert new entity into authdb.users

Delete invite

Delete entity from authdb.invites using requested { id }