Quote:
Originally Posted by chaley
I'll take a look at whether it makes sense adding an option to composite column definition to not include the column in an OPF. They are there for clients to use. They aren't much use for backups because (duh) they are computed when needed.
The problem will be getting the details right because OPFs are built in lots of places with differing versions.
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I added a checkbox to the composite column definition dialog that controls whether the value for that column is stored in an OPF, default True. If the box is unchecked then the value in the OPF for that column is set to the empty value. This method preserves the data necessary for the distributed backup without putting the large value into the OPF.
The changes are now in calibre source and will be in the next release/preview.