系统地修复数据集中的已知错误

My essential problem is that I have read only access to a large data set. This data set has about 300,000 records. Some of these records contain errors ranging from typos to chunks of missing data. Unfortunately, it is not possible to fix at the source and also not possible to create a fixed local clone. As these errors are discovered they are relatively easy to fix and can usually be accomplished in a few lines of code. The problem I am struggling with is a sane and extensible system to allow these errors to be documented and fixed.My essential problem is that I have read only a