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Hmmm, what I witnessed: full-text-search.db is not vacuumed when applying the normal DB maintenance.
What did I do: I copied the full-text-search.db to another location, noted its size and applied vacuum via SQLiteSpy (1.9.16) which took some time to compress it slightly. That indicated to me that full-text-search.db would likely to be a vacuum candidate.
Thereafter I fired-up calibre, choose maintenance (=Check Library) and saw the metadata.db being vacuumed after a short time, while file full-text-search.db was never touched. The short time it took was also an indication.
I'm currently using calibre 6.2. Did I applied the maintenance correctly?
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