init_database.py 增加 --import-db 参数，支持在版本升级时尽可能重用向量库 #1951
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表结构发生变化，但向量库无需重建，可以在重建数据库后，使用本参数从旧的数据库中导入信息
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init_database.py 增加 --import-db 参数，在版本升级时，如果 info.db 表结构发生变化，但向量库无需重建，可以在重建数据库后，使用本参数从旧的数据库中导入信息。
$ cp /{KB_ROOT_PATH/info.db /path/to/info.bak.db $ python init_database.py --clear-tables --import-db /path/to/info.bak.db # fill columns data manually