User
	INTEGER	UserID	PRIMARY_KEY
	
	STRING	Username	NULL, UNIQUE
	
	STRING	PasswordHash	NULL	; < Hmm... needed? (Nah, PAM only)
	INTEGER	UnixUID 	NULL, UNIQUE
	INTEGER	PinCode 	NULL
	
	INTEGER	Balance
	DATETIME LastSeen
	BOOL	bEnabled
	BOOL	bCokeMember
	BOOL	bDoorMember
	BOOL	bAdministrator	; Database admin (create/delete/lock accounts)
	BOOL	bInternal
	
	
Card -> User
	STRING	CardID	UNIQUE
	INTEGER	UserID