In terms of appending data, could you explain your use case? I don’t know why you would want to append data from outside the archiver.
The archiver makes many assumptions about these files in terms of what data is in them dependent on the name of the file. I would be
Careful about altering them.
A simple solution can be to push data into the files using a PV! Note that the archiver doesn’t do any checks that timestamps correspond to the current time.
Only that they are sequential. So as long as you are adding new events you can push extra events in.