Quote:
Originally Posted by jecilop
So despite appearing as just 2 different columns (with different types of data for link vs note), they...I take from this...are stored differently thus making Notes safe but NOT links.
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As you have asked Kovid to respond, not me, I will explain only this piece.
Links are stored in the main calibre DB. Notes are stored in a separate DB. As such, notes can be made unusable only if the book ID changes, which is rare. Links can (sometimes) disappear if the underlying item such as a tag is edited or otherwise modified, if items are combined, or if items are merged. Why? The older calibre won't know to copy the values in the database column it doesn't know about.