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Decompose core repository god-module and TaskRepository trait
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Fix restore data-loss (C1) and make backup completeness structural
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fix(storage): blob GC, attachment write-order, atomic positive-only manual time
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feat(backup): include all syncable tables in backups and restore
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fix(sync,backup): restore recurrence_rule on apply + transactional verbatim restore
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Fix backup-restore corruption, milestone delete, sync backoff, and time validation