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→'Compact databases' feature for Mozilla calendaring applications (Lightning, Sunbird)
Add the possibility to compact the database for local storage calendars based on SQLite using the VACUUM command. At the moment the local database for events and tasks will not get smaller even if you delete your tasks and events. This has serious performance implications for people, who work a lot with their calendar.
See also [https://bugzilla.mozilla.org/show_bug.cgi?id=352976 Bug 352976]
Resources: ctalbert, daniel in #calendar on irc.mozilla.org