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+## Major changes in 2.0.0
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+
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+- Database backend switched from LevelDB to SQLite. There is a migration on
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+ first launch which can be lengthy for larger setups. The new database is
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+ easier to understand and maintain and, hopefully, less buggy.
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+
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+- Deleted items are no longer kept forever in the database, instead they are
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+ forgotten after six months. If your use case require deletes to take
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+ effect after more than a six month delay, set the
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+ `--db-delete-retention-interval` command line option or corresponding
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+ environment variable to zero, or a longer time interval of your choosing.
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+
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+- Modernised command line options parsing. Old single-dash long options are
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+ no longer supported, e.g. `-home` must be given as `--home`. All serve
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+ options are now also accepted as environment variables. See `syncthing
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+ serve --help` for details.
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+
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+- Rolling hash detection of shifted data is no longer supported as this
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+ effectively never helped. Instead, scanning and syncing is faster and more
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+ efficient without it.
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+
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+- A "default folder" is no longer created on first startup.
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Jakob Borg