Field	Type	Null	Key	Default	Extra
id	int(11)	NO	PRI	NULL	auto_increment
username	varchar(50)	NO	UNI	NULL	
password	varchar(255)	NO		NULL	
role	varchar(20)	YES		operator	
email	varchar(100)	YES		NULL	
full_name	varchar(100)	YES		NULL	
created_at	int(11)	NO		NULL	
last_login	int(11)	YES		NULL