A log of all user activity across the system.
ref,int(11),
logged,datetime,The date and time of the activity
user,int(11),
log_code,char(1),A single character code defining the activity type
note,text,Further information relating to the activity
value_old,text,If the activity involved a change - the old value
value_new,text,If the activity involved a change - the new value
value_diff,text,The difference between the old and new values
remote_table,varchar(100),The table the activity related to
remote_column,varchar(100),The column the activity related to
remote_ref,varchar(100),The row the activity related to