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@chaley - thanks, yes, the new backend did speed up composite columns, I was able to reinstate one that I had previously removed because it was having an adverse effect on performance - so far so good.
I think I know why I missed the formats_xxx() functions, would have searched the manual for 'file' within 3 words of 'date' and 'size'.
The three formats_xxx functions work fine in Book Information as I envisaged. Would be good if one could optionally specify a format eg formats_size('EPUB'), formats_modtimes('MM/dd/yyyy', 'AZW3')
Discovery : you can sort on a column with the Sort By feature even though the column is not shown in the book list.
BTW : the PDF version of the manual has a 'misprint', see attachment, shows up in 4 viewers, Firefox, Chrome, XChange and Foxit. I think its been there for a while.
BR
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