Macro Metadata Log Table - response (1) by tomnolan

If you enable query logging, DBQL will contain most of what you asked for, such as "who execute, when exec, success flag". I'm not sure what you mean by "count(*)", but if you are referring to the number of result set rows, DBQL will contain that also.
 
So there is no need to reinvent the wheel. There is no need to create your own log table. Use DBQL.