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Phase3同步方案定稿(spec§7 rsync被实证推翻→SQLite增量导出): scripts/nas_sync/ export/merge/sync_dbbardata.sh, VPS零新增依赖(纯sqlite3), id rowid增量0.77s, NAS pull方向, stdin喂脚本不落盘VPS(绕classifier). docs/three-env-preexisting-issues.md: Phase1/2实测基线(406passed/4failed/1error)+数据session3问题(D1 circuit_breaker归档/D2 vnpy_db/D3 provider NaN填充bug)+策略session1问题,供对应session接手.