Logs all activity relating to a resource.
ref,int(11),
date,datetime,
user,int(11),
resource,int(11),
type,char(1),
resource_type_field,int(11),
notes,text,
diff,mediumtext,
usageoption,int(11),
purchase_size,varchar(10),
purchase_price,decimal(10§2),
access_key,char(50),
previous_value,longtext,
