Comment 6 for bug 1902313

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Kovid Goyal (kovid) wrote : Re: calibre bug 1902313

Sounds OK to me. Since its very much an opt in thing, people can decide
for themselves, if they want to pay the performance penalty by creating
such a column.

From a caching perspective, an easy way to do it, is to key it against
the last modified time of the db file. However, I dont know if it is actually
worth it, would need profiling to answer that.