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Old 04-30-2021, 10:24 PM   #11
kovidgoyal
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The only incompatibility between the databases is the from v5 onwards the database uses the sqlite FTS extension. This extension is not present in *some* builds of v4 calibre before v 4.23, notably on windows. IIRC on linux FTS is present in all v4 builds anyway so the databases are fully compatible.
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