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There is decsync that works pretty good on Android. It stores contacts & calendars in a text file that can be synced with syncthing. There is a plugin for Evolution (Linux Mail client) but none for Thunderbird. But there is a plugin for Radicale, which is a caldav server. So you can run a local caldav server, connect Thunderbird to it and sync the decsync database with syncthing to your phone.
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