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Old 11-09-2018, 10:37 AM   #1
Pierre-Olivier
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Column "Modified", 99% of my books have the same recent date in this column.

Hello,

I've just encountered a strange thing. I was using Calibre 3.25 (now it has been updated), and I saw that nearly all my books have the same date in the column "modified" : 3 nov 2018. I have absolutely not modified all my books this day, and I wonder how it coud have happened.

It's a real problem, because I use Calibre companion, and and when this column is modified, it downloads the new metadata, and with my huge collection of eBooks, it takes between 4 and 12 hours, depending on the device.

Can someone try to give an explanation.

Thx
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Old 11-09-2018, 10:46 AM   #2
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Some actions result in changing metadata for multiple books. A common one is changing the case of a tag, say from "fiction" to "Fiction". That will update all books containing that tag.
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Old 11-09-2018, 11:59 AM   #3
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Also running Library Maintenance will affect ALL

My guess that you added a book with:

tags in common with the book that were changed BUT it had a different 'case', and Calibre updates the case of the tag
or
it was one of those with dozens of tags with the wrong case, so lots of books got hit

FWIW I use Title case for my tags and I wish Calibre would have a 'filter action' to do that one (it has Upper, Lower, Capitalize)
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Old 11-09-2018, 12:22 PM   #4
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Thanks for the answer, but it's not this. I only use 19 tags, and never modified them.
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Old 11-09-2018, 12:53 PM   #5
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Quote:
Originally Posted by Pierre-Olivier View Post
Thanks for the answer, but it's not this. I only use 19 tags, and never modified them.
You did not import any books? The Import (read from metadata) can flip case on you. with only 19, the chances of affecting a goodly number of titles is high.
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Old 11-09-2018, 01:20 PM   #6
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Of course I import regularly some eBooks.

How is it possible to avoid such global modifications.?
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Old 11-09-2018, 01:28 PM   #7
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Quote:
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Of course I import regularly some eBooks.

How is it possible to avoid such global modifications.?
The cure is more painful than correcting the change.

But take a look at Preferences: Adding books: Adding Actions (a tab)

I have rules to filter Tags (a button):
Capitalize the tag if it matches pattern (.+)
You could choose 'your' what to do style

Modified is mostly an internal flag the the backup OPF is queued for update (also updates a CC sync if you use CC, on the next connect)
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Old 11-09-2018, 01:33 PM   #8
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You can change the Last Modified Date to anything you please with the Job Spy plugin.
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Old 11-09-2018, 07:15 PM   #9
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Another reason for the timestamp to be changed for all books is changing custom columns. Adding or removing them will update them all. Also, changes the set of values for a "Text, but with a fixed set of permitted values" will also update everything. That's a behaviour I really don't like. But, it's easy to fix if you want to run from source.
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Old 11-09-2018, 07:41 PM   #10
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For all the reasons given by other responders I ignore the Modified column entirely.

I have a Last Action Date custom column that I update whenever I do anything that I regard as significant. Because I edit in the book list it's easy to maintain.

BR
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Old 11-11-2018, 02:25 PM   #11
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yen I've also thought to such a solution, but Calibre Companion use only the "last_modified" column, and it's really a pain when this app decide to download metadata of thousands of eBooks because this column has been modified for an unknown reason. None of the explanation mentioned above can explain such a behavior for my use.
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Old 11-11-2018, 03:42 PM   #12
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Going forward, back up the LMD for every book en masse routinely so it can be restored in seconds so that CC does not trigger any activity. Job Spy has 56 tools; this is one of them.
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