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Фаза 1: SSTable Integrity - SSTable v3 формат с CRC32 footer (data/index/bloom CRC) - Нов модул storage/crc32.nim (zero-dep, IEEE 802.3) - verifySSTable() — проверка на magic, version, CRC - loadSSTable strict mode — отхвърля корумпирани файлове - newLSMTree логва [WARN] при corrupt SSTables Фаза 2: baradb repair - Нов модул tools/repair.nim - Сканира SSTables, проверява CRC, премества битите в corrupt/ - WAL replay (CrashRecovery) за възстановяване на данни - CLI: ./baradadb repair --data-dir=... [--dry-run] Фаза 3: MANIFEST File - Atomic write MANIFEST (tmp + rename) - newLSMTree зарежда от MANIFEST, fallback към walkDir - checkStorageConsistency() — orphan/missing detection - flushUnsafe и compaction записват MANIFEST Фаза 4: WAL Rotation & Incremental Backup - WAL segment rotation при 64MB (wal_archive/wal.000NNN.log) - maybeRotate() на всеки 1000 записа + при flush - backup incremental — архивира MANIFEST + SSTables + WAL - CRC verification на SSTables преди архивиране Фаза 5: Online Consistent Backup - checkpoint() — freeze memtable + flush + WAL rotate - ./baradadb checkpoint — offline consistent snapshot - backup --online — checkpoint + incremental backup Фаза 6: SSTable Version Migration - SSTable.fileVersion поле - listLegacySSTables() — намира v1/v2 файлове - migrateSSTable() — пренаписва към v3 (tmp + rename) - ./baradadb migrate [--dry-run] — offline migration Документация: - Обновени docs/en/backup.md, docs/bg/backup.md - Обновени docs/en/storage.md, docs/bg/storage.md - Добавени тестове в tests/test_all.nim