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databases created with pre 1.0 versions of calibre could have multiple tags/series/publishers/etc. that differ only in the case. This is because sqlite's case handling only works for ascii characters. This could cause problems when setting metadata. Automatically detect and fix these databases. Fixes #1221545 [edit metadata individually>Download Metadata>press ok>unhandled exception](https://bugs.launchpad.net/calibre/+bug/1221545)